# Mg–Si system

> Mg–Si system: 217 accepted literature values (invariant reaction 78, heat capacity / entropy / enthalpy 62, formation 49, mixing / partial 24) and 7 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/MG-SI.html · Markdown: https://data.orchid-project.org/systems/MG-SI.md

217 accepted literature values from 6 paper(s) (experimental 169, model 38, DFT 7, unspecified 3); 7 calculated phase diagram(s). 12 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/MG-SI.json) · [CSV](https://data.orchid-project.org/systems/MG-SI.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#MG-SI) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#MG-SI/MgSi-00Yan-LB.json) · [phases (6)](https://data.orchid-project.org/phases/pages/MG-SI.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/MG-SI.html) · [Markdown](https://data.orchid-project.org/systems/MG-SI.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 169 |
| model | 38 |
| DFT | 7 |
| unspecified | 3 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 78 |
| phase transition | 2 |
| formation | 49 |
| mixing / partial | 24 |
| heat capacity / entropy / enthalpy | 62 |
| crystal structure | 1 |
| other property | 1 |

## Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| MgSi-00Yan-LB.tdb | X.-Y. Yan, F. Zhang, Y.A. Chang, J. Phase Equilib., 21, 379-84(2000). [doi:10.1361/105497100770339914](https://doi.org/10.1361/105497100770339914) | `7347483183dd69b235e8f17e2415d2f3f08f25c17dc1aaf238f9d12484a8ded3` | [viewer](https://orchid-project.org/phase-diagrams/#MG-SI/MgSi-00Yan-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgSi-00Yan-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgSi-00Yan-LB.json) |
| MgSi-04Kev.tdb | D. Kevorkov, R. Schmid-Fetzer, F. Zhang, J. Phase Equilib. Diffus., 25, 140-51(2004). [doi:10.1361/15477030418569](https://doi.org/10.1361/15477030418569) | `8a16b2608533d0410bf1308a14792d53ea882323537c98fcad84aa15c1149874` | [viewer](https://orchid-project.org/phase-diagrams/#MG-SI/MgSi-04Kev.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgSi-04Kev.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgSi-04Kev.json) |
| MgSi-09Yua.tdb | X. Yuan, W. Sun, Y. Du, D. Zhao, H. Yang, Calphad, 33, 673-78(2009). [doi:10.1016/j.calphad.2009.08.004](https://doi.org/10.1016/j.calphad.2009.08.004) | `d51ae3480eef32b86386bfcb89fc7bcd133e2616fcaa0fe198f6fae6fb50c6f0` | [viewer](https://orchid-project.org/phase-diagrams/#MG-SI/MgSi-09Yua.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgSi-09Yua.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgSi-09Yua.json) |
| MgSi-12Sch.tdb | M. Schick, B. Hallstedt, A. Glensk, B. Grabowski, T. Hickel, M. Hampl, J. Groebner, J. Neugebauer, R. Schmid-Fetzer, Calphad, 37, 77-86(2012). [doi:10.1016/j.calphad.2012.02.001](https://doi.org/10.1016/j.calphad.2012.02.001) | `fb5bcd7ddaaab551834ae583f3ba434991b4d8f8b5a09af0099cd9b7003ca827` | [viewer](https://orchid-project.org/phase-diagrams/#MG-SI/MgSi-12Sch.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgSi-12Sch.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgSi-12Sch.json) |
| MgSi-16Lia.tdb | S.-M. Liang, P. Wang, R. Schmid-Fetzer, Calphad, 54, 82-96(2016). [doi:10.1016/j.calphad.2016.06.003](https://doi.org/10.1016/j.calphad.2016.06.003) | `01f8dc8d22e0e37fc9047037567160dc45afa097c94df789ff0838c79493a87e` | [viewer](https://orchid-project.org/phase-diagrams/#MG-SI/MgSi-16Lia.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgSi-16Lia.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgSi-16Lia.json) |
| MgSi-86Lud.tdb | D. Luedecke, Z. Metallkd., 77, 278-83(1986). [doi:10.1515/ijmr-1986-770503](https://doi.org/10.1515/ijmr-1986-770503) | `9be7ae691d0061a0b17db2f254fadff336ac03a68fc3d3318104cfb8f73bcbcb` | [viewer](https://orchid-project.org/phase-diagrams/#MG-SI/MgSi-86Lud.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgSi-86Lud.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgSi-86Lud.json) |
| MgSi-97Feu.tdb | H. Feufel, T. Godecke, H.L. Lukas, F. Sommer, J. Alloys Compd., 247, 31-42(1997). [doi:10.1016/S0925-8388(96)02655-2](https://doi.org/10.1016/S0925-8388%2896%2902655-2) | `ebffb15d1bb1ae713a974883794182d50b7db69577957dc87b49777834197069` | [viewer](https://orchid-project.org/phase-diagrams/#MG-SI/MgSi-97Feu.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgSi-97Feu.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgSi-97Feu.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| MgSi-00Yan-LB.tdb | 1216.94 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.53013) + DIAMOND_A4 (x(Si) 1) |
| MgSi-00Yan-LB.tdb | 1216.94 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.53022) + DIAMOND_A4 (x(Si) 1) |
| MgSi-00Yan-LB.tdb | 1216.94 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.53031) + DIAMOND_A4 (x(Si) 1) |
| MgSi-00Yan-LB.tdb | 912.35 | HCP_A3 (x(Si) 6.000e-5) + LIQUID (x(Si) 0.0132) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-00Yan-LB.tdb | 912.35 | HCP_A3 (x(Si) 5.000e-5) + LIQUID (x(Si) 0.01306) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-04Kev.tdb | 1219.67 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.54114) + DIAMOND_A4 (x(Si) 1) |
| MgSi-04Kev.tdb | 1219.67 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.54124) + DIAMOND_A4 (x(Si) 1) |
| MgSi-04Kev.tdb | 1219.67 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.54148) + DIAMOND_A4 (x(Si) 1) |
| MgSi-04Kev.tdb | 910.53 | HCP_A3 (x(Si) 5.000e-5) + LIQUID (x(Si) 0.01455) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-04Kev.tdb | 910.53 | HCP_A3 (x(Si) 5.000e-5) + LIQUID (x(Si) 0.01446) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-09Yua.tdb | 1218.74 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.53494) + DIAMOND_A4 (x(Si) 1) |
| MgSi-09Yua.tdb | 1218.74 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.53505) + DIAMOND_A4 (x(Si) 1) |
| MgSi-09Yua.tdb | 1218.74 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.5352) + DIAMOND_A4 (x(Si) 1) |
| MgSi-09Yua.tdb | 911.75 | HCP_A3 (x(Si) 3.000e-5) + LIQUID (x(Si) 0.01363) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-09Yua.tdb | 911.75 | HCP_A3 (x(Si) 3.000e-5) + LIQUID (x(Si) 0.01351) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-12Sch.tdb | 1212.46 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.54294) + DIAMOND_A4 (x(Si) 1) |
| MgSi-12Sch.tdb | 1212.46 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.54306) + DIAMOND_A4 (x(Si) 1) |
| MgSi-12Sch.tdb | 1212.46 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.54314) + DIAMOND_A4 (x(Si) 1) |
| MgSi-12Sch.tdb | 910.24 | HCP_A3 (x(Si) 3.000e-5) + LIQUID (x(Si) 0.01471) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-12Sch.tdb | 910.24 | HCP_A3 (x(Si) 3.000e-5) + LIQUID (x(Si) 0.01464) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-16Lia.tdb | 1212.97 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.53711) + DIAMOND_A4 (x(Si) 0.99991) |
| MgSi-16Lia.tdb | 1212.97 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.53714) + DIAMOND_A4 (x(Si) 0.99991) |
| MgSi-16Lia.tdb | 910.39 | HCP_A3 (x(Si) 3.000e-5) + LIQUID (x(Si) 0.01483) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-16Lia.tdb | 910.39 | HCP_A3 (x(Si) 3.000e-5) + LIQUID (x(Si) 0.01475) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-86Lud.tdb | 1219.44 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.53106) + DIAMOND_A4 (x(Si) 1) |
| MgSi-86Lud.tdb | 1219.44 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.5312) + DIAMOND_A4 (x(Si) 1) |
| MgSi-86Lud.tdb | 1219.44 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.5312) + DIAMOND_A4 (x(Si) 1) |
| MgSi-86Lud.tdb | 1219.44 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.53147) + DIAMOND_A4 (x(Si) 1) |
| MgSi-86Lud.tdb | 923 | HCP_A3 (x(Si) 0) + LIQUID (x(Si) 0) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-86Lud.tdb | 912.53 | HCP_A3 (x(Si) 1.000e-5) + LIQUID (x(Si) 0.01339) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-86Lud.tdb | 912.53 | HCP_A3 (x(Si) 1.000e-5) + LIQUID (x(Si) 0.01323) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-97Feu.tdb | 1216.62 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.54181) + DIAMOND_A4 (x(Si) 1) |
| MgSi-97Feu.tdb | 1216.62 | MG2SI_C1 (x(Si) 0.33333) + LIQUID (x(Si) 0.54188) + DIAMOND_A4 (x(Si) 1) |
| MgSi-97Feu.tdb | 911.88 | HCP_A3 (x(Si) 3.000e-5) + LIQUID (x(Si) 0.01297) + MG2SI_C1 (x(Si) 0.33333) |
| MgSi-97Feu.tdb | 911.88 | HCP_A3 (x(Si) 3.000e-5) + LIQUID (x(Si) 0.01285) + MG2SI_C1 (x(Si) 0.33333) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/MG/MG-SI.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/MG/MG-SI.json) · [CALPHAD hull MgSi-00Yan-LB](https://data.orchid-project.org/hulls/calphad-sgte/MG/MG-SI--MgSi-00Yan-LB.json) · [CALPHAD hull MgSi-04Kev](https://data.orchid-project.org/hulls/calphad-sgte/MG/MG-SI--MgSi-04Kev.json) · [CALPHAD hull MgSi-09Yua](https://data.orchid-project.org/hulls/calphad-sgte/MG/MG-SI--MgSi-09Yua.json) · [CALPHAD hull MgSi-12Sch](https://data.orchid-project.org/hulls/calphad-sgte/MG/MG-SI--MgSi-12Sch.json) · [CALPHAD hull MgSi-86Lud](https://data.orchid-project.org/hulls/calphad-sgte/MG/MG-SI--MgSi-86Lud.json) · [CALPHAD hull MgSi-97Feu](https://data.orchid-project.org/hulls/calphad-sgte/MG/MG-SI--MgSi-97Feu.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Mg–Si system (78)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1363.15 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Lebeau 1901_ | Table 5, p. 5, row 2; `ORC-QIJT2G5P5K` |  |
| 1363 | congruent melting: L -> Mg2Si | L: Si 0.333; Mg2Si: Si 0.333 | experimental | [2] Schick 2012; _cites Vogel 1909_ [doi](https://doi.org/10.1002/zaac.19090610105) | Table 5, p. 8, row 15; `ORC-5KOOTVMM6S` |  |
| 1358.15 | congruent melting: L -> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Klemm 1941_ [doi](https://doi.org/10.1002/zaac.19412450404) | Table 5, p. 4, row 12; `ORC-4SPEGMJTH5` |  |
| 1358.15 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Caulfield 1966_ | Table 5, p. 5, row 14; `ORC-F7HX5FV6LO` |  |
| 1358.15 | congruent melting: L -> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Geffken 1968_ | Table 5, p. 4, row 16; `ORC-YMYXOHS74A` |  |
| 1358.15 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Geffken 1968_ | Table 5, p. 5, row 18; `ORC-Z3JTIVS2DT` |  |
| 1358 | congruent melting: L -> Mg2Si | L: Si 0.333; Mg2Si: Si 0.333 | experimental | [2] Schick 2012; _cites Geffken 1968_ | Table 5, p. 8, row 17; `ORC-AXYT2A55J3` |  |
| 1357.75 | congruent melting: L -> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | model | [3] Yuan 2009 | Table 5, p. 4, row 22; `ORC-XIED4RPFT2` |  |
| 1357.45 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000 | Table 5, p. 5, row 36; `ORC-BPRRWMR357` |  |
| 1354.15 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Ludecke 1986_ | Table 5, p. 5, row 27; `ORC-GCWMGMHWXJ` |  |
| 1353.15 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Dorner 1981_ [doi](https://doi.org/10.1016/0364-5916%2881%2990016-x) | Table 5, p. 5, row 24; `ORC-HZ7SFKANAR` |  |
| 1353.15 | congruent melting: L -> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Eldridge 1967_ | Table 5, p. 4, row 13; `ORC-ZNLNCRLMAB` |  |
| 1351.15 | congruent melting: L -> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Schurmann 1977_ | Table 5, p. 4, row 19; `ORC-KT5Q472JMJ` |  |
| 1351.15 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Schurmann 1977_ | Table 5, p. 5, row 21; `ORC-QMRIJPFO5T` |  |
| 1351 | congruent melting: L -> Mg2Si | L: Si 0.333; Mg2Si: Si 0.333 | experimental | [2] Schick 2012; _cites Schurmann 1977_ | Table 5, p. 8, row 18; `ORC-4IWA64COPU` |  |
| 1350.5 | congruent melting: L -> Mg2Si | L: Si 0.333; Mg2Si: Si 0.333 | model | [2] Schick 2012 | Table 5, p. 8, row 21; `ORC-HPHPEBWYS3` |  |
| 1350.15 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Eldridge 1967_ | Table 5, p. 5, row 15; `ORC-E7U3Q2KZD4` |  |
| 1349.95 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Lukas 1994_ | Table 5, p. 5, row 30; `ORC-MHWO6DU6WI` |  |
| 1349.55 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Feufel 1997_ [doi](https://doi.org/10.1016/s0925-8388%2896%2902655-2) | Table 5, p. 5, row 33; `ORC-ZSRIUCE2F6` |  |
| 1346 | congruent melting: L -> Mg2Si | L: Si 0.333; Mg2Si: Si 0.333 | experimental | [2] Schick 2012 | Table 5, p. 8, row 20; `ORC-IE6LCVOVT5` |  |
| 1345.15 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Beardmore 1966_ | Table 5, p. 5, row 13; `ORC-CD7RYUEH6C` |  |
| 1343.15 | congruent melting: L -> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Vogel 1909_ [doi](https://doi.org/10.1002/zaac.19090610105) | Table 5, p. 4, row 3; `ORC-6FZW7Z5GBP` |  |
| 1343.15 | congruent melting: L \<-> Mg2Si | L: Mg 0.666667, Si 0.333333; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Vogel 1909_ [doi](https://doi.org/10.1002/zaac.19090610105) | Table 5, p. 5, row 5; `ORC-NMT3GULATJ` |  |
| 1343 | congruent melting: L -> Mg2Si | L: Si 0.333; Mg2Si: Si 0.333 | experimental | [2] Schick 2012; _cites Wohler 1926_ [doi](https://doi.org/10.1002/zaac.19261510102) | Table 5, p. 8, row 16; `ORC-UGAJU3AJ5B` |  |
| 1223.15 | eutectic: L \<-> Mg2Si + (Si) | L: Si 0.5444; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Vogel 1909_ [doi](https://doi.org/10.1002/zaac.19090610105) | Table 5, p. 5, row 4; `ORC-LCPZVGO5EE` |  |
| 1223.15 | eutectic: L -> Mg2Si + Si-diamond | L: Si 0.544; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Vogel 1909_ [doi](https://doi.org/10.1002/zaac.19090610105) | Table 5, p. 4, row 2; `ORC-LWLTOSITBQ` |  |
| 1223 | eutectic: L -> Mg2Si + Si (dia) | L: Si 0.54; Mg2Si: Si 0.333; Si (dia): Si 1 | experimental | [2] Schick 2012; _cites Vogel 1909_ [doi](https://doi.org/10.1002/zaac.19090610105) | Table 5, p. 8, row 8; `ORC-HEMVRHULHU` |  |
| 1219 | eutectic: L -> Mg2Si + Si (dia) | L: Si 0.529; Mg2Si: Si 0.333; Si (dia): Si 1 | experimental | [2] Schick 2012; _cites Farkas 1985_ | Table 5, p. 8, row 12; `ORC-VJKBFOQG42` |  |
| 1218.8 | eutectic: L -> Mg2Si + Si (dia) | L: Si 0.53; Mg2Si: Si 0.333; Si (dia): Si 1 | experimental | [2] Schick 2012; _cites Geffken 1968_ | Table 5, p. 8, row 10; `ORC-UVZQPISW4Q` |  |
| 1218.75 | eutectic: L -> Mg2Si + Si-diamond | L: Si 0.53; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Geffken 1968_ | Table 5, p. 4, row 15; `ORC-6Z5W5OSF6Q` |  |
| 1218.75 | eutectic: L \<-> Mg2Si + (Si) | L: Si 0.53; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Geffken 1968_ | Table 5, p. 5, row 17; `ORC-R3MS6HADTZ` |  |
| 1218.75 | eutectic: L -> Mg2Si + Si-diamond | L: Si 0.535; Mg2Si: Mg 0.666667, Si 0.333333 | model | [3] Yuan 2009 | Table 5, p. 4, row 21; `ORC-ZZF7BVFBUO` |  |
| 1217.15 | eutectic: L \<-> Mg2Si + (Si) | L: Si 0.5302; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000 | Table 5, p. 5, row 35; `ORC-IERBTRHZ4J` |  |
| 1217.15 | eutectic: L \<-> Mg2Si + (Si) | Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Dorner 1981_ [doi](https://doi.org/10.1016/0364-5916%2881%2990016-x) | Table 5, p. 5, row 23; `ORC-YOWMO7GWZF` |  |
| 1216.71 | eutectic: L \<-> Mg2Si + (Si) | L: Si 0.5418; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Feufel 1997_ [doi](https://doi.org/10.1016/s0925-8388%2896%2902655-2) | Table 5, p. 5, row 32; `ORC-URKEGASOA2` |  |
| 1216.69 | eutectic: L \<-> Mg2Si + (Si) | L: Si 0.5401; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Lukas 1994_ | Table 5, p. 5, row 29; `ORC-A4HRW5GLSS` |  |
| 1215.5 | eutectic: L \<-> Mg2Si + (Si) | L: Si 0.529; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Ludecke 1986_ | Table 5, p. 5, row 26; `ORC-M4Q4HIXEGT` |  |
| 1215 | eutectic: Liquid → Mg2 Si + (Si) |  | experimental | [2] Schick 2012 | p. 4; `ORC-GZZDZGOBQE` | “The temperature of the eutectic reaction Liquid → Mg2 Si + (Si), determined from onset values of peaks on heating, was 1215 K.” |
| 1215 | eutectic: L -> Mg2Si + Si (dia) | Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [2] Schick 2012 | Table 5, p. 8, row 13; `ORC-W4DTZOM43P` |  |
| 1214.4 | eutectic: Liquid -> Mg2Si + diamond | Liquid: Si 0.53; Mg2Si: Si 0.333; diamond: Si 1 | model | [4] (ed.) 1998 | Table I, p. 239, row 2; `ORC-WH5JYXI2OT` |  |
| 1213.15 | eutectic: L \<-> Mg2Si + (Si) | Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Schurmann 1977_ | Table 5, p. 5, row 20; `ORC-GEPE2HHZBE` |  |
| 1213.15 | eutectic: L -> Mg2Si + Si-diamond | L: Si 0.541; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Schurmann 1977_ | Table 5, p. 4, row 18; `ORC-POH45D53AF` |  |
| 1213 | eutectic: L -> Mg2Si + Si (dia) | L: Si 0.541; Mg2Si: Si 0.333; Si (dia): Si 1 | experimental | [2] Schick 2012; _cites Schurmann 1977_ | Table 5, p. 8, row 11; `ORC-MWUMEIXWSK` |  |
| 1212.5 | eutectic: L -> Mg2Si + Si (dia) | L: Si 0.543; Mg2Si: Si 0.333; Si (dia): Si 1 | model | [2] Schick 2012 | Table 5, p. 8, row 14; `ORC-DQNTUKLQMY` |  |
| 1193.15 | eutectic: L -> Mg2Si + Si-diamond | L: Si 0.534; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Wohler 1926_ [doi](https://doi.org/10.1002/zaac.19261510102) | Table 5, p. 4, row 6; `ORC-HSEAY34GKF` |  |
| 1193.15 | eutectic: L \<-> Mg2Si + (Si) | L: Si 0.5343; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Woler 1926_ | Table 5, p. 5, row 7; `ORC-SS4V2BD7QI` |  |
| 1193 | eutectic: L -> Mg2Si + Si (dia) | L: Si 0.53; Mg2Si: Si 0.333; Si (dia): Si 1 | experimental | [2] Schick 2012; _cites Wohler 1926_ [doi](https://doi.org/10.1002/zaac.19261510102) | Table 5, p. 8, row 9; `ORC-5X23A3BAQ3` |  |
| 919 | eutectic: L -> Mg (hcp) + Mg2Si | L: Si 0.035; Mg (hcp): Si 0; Mg2Si: Si 0.333 | experimental | [2] Schick 2012; _cites Vogel 1909_ [doi](https://doi.org/10.1002/zaac.19090610105) | Table 5, p. 8, row 1; `ORC-Z3567KAMGP` |  |
| 918.15 | eutectic: L -> (Mg)-hcp + Mg2Si | L: Si 0.0348; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Vogel 1909_ [doi](https://doi.org/10.1002/zaac.19090610105) | Table 5, p. 4, row 1; `ORC-5UNTR76UAO` |  |
| 918.15 | eutectic: L -> (Mg)-hcp + Mg2Si | L: Si 0.012; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Schmidt 1927_ | Table 5, p. 4, row 7; `ORC-KDPBOMHAJU` |  |
| 918.15 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.0348; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Vogel 1909_ [doi](https://doi.org/10.1002/zaac.19090610105) | Table 5, p. 5, row 3; `ORC-TJ4E4E3DY6` |  |
| 918.15 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.0119; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Schmidt 1927_ | Table 5, p. 5, row 8; `ORC-V5LCTAEP43` |  |
| 918 | eutectic: L -> Mg (hcp) + Mg2Si | L: Si 0.012; Mg (hcp): Si 0; Mg2Si: Si 0.333 | experimental | [2] Schick 2012; _cites Schmidt 1927_ | Table 5, p. 8, row 2; `ORC-BBX4HRXHRA` |  |
| 915.15 | eutectic: L -> (Mg)-hcp + Mg2Si | L: Si 0.0105; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Goto 1937_ | Table 5, p. 4, row 10; `ORC-D3X7RIUGPK` |  |
| 915.15 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.0105; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Goto 1937_ | Table 5, p. 5, row 11; `ORC-WP676777JD` |  |
| 913.15 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.0278; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Elchardus 1935_ | Table 5, p. 5, row 9; `ORC-ETP4IMBTJR` |  |
| 912.35 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.013; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000 | Table 5, p. 5, row 34; `ORC-F5EI56NHP7` |  |
| 912.3 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.0117; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Dorner 1981_ [doi](https://doi.org/10.1016/0364-5916%2881%2990016-x) | Table 5, p. 5, row 22; `ORC-26EEXGMTD5` |  |
| 912.02 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.0129; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Feufel 1997_ [doi](https://doi.org/10.1016/s0925-8388%2896%2902655-2) | Table 5, p. 5, row 31; `ORC-2YQ3ZWS3VM` |  |
| 912 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.0133; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Ludecke 1986_ | Table 5, p. 5, row 25; `ORC-WD7FFBQ4CN` |  |
| 911.82 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.013; Mg2Si: Mg 0.666667, Si 0.333333 | model | [1] Yan 2000; _cites Lukas 1994_ | Table 5, p. 5, row 28; `ORC-R4ECSY7DXS` |  |
| 911.8 | eutectic: Liquid -> hcp-A3 + Mg2Si | Liquid: Si 0.013; hcp-A3: Si 0; Mg2Si: Si 0.333 | model | [4] (ed.) 1998 | Table I, p. 239, row 1; `ORC-7FXVGAIAHW` |  |
| 911.75 | eutectic: L -> (Mg)-hcp + Mg2Si | Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Geffken 1968_ | Table 5, p. 4, row 14; `ORC-CDUCTCRC43` |  |
| 911.75 | eutectic: L -> (Mg)-hcp + Mg2Si | L: Si 0.0135; Mg2Si: Mg 0.666667, Si 0.333333 | model | [3] Yuan 2009 | Table 5, p. 4, row 20; `ORC-EH26SFZ4SG` |  |
| 911.75 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.0116; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Geffken 1968_ | Table 5, p. 5, row 16; `ORC-VVXSGSL7ZT` |  |
| 911.7 | eutectic: L -> Mg (hcp) + Mg2Si | Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [2] Schick 2012; _cites Geffken 1968_ | Table 5, p. 8, row 5; `ORC-HD5VKBHZUV` |  |
| 910.85 | eutectic: L -> (Mg)-hcp + Mg2Si | L: Si 0.0116; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Raynor 1940_ | Table 5, p. 4, row 11; `ORC-2AI5BC2WJ2` |  |
| 910.75 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.0116; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Raynor 1940_ | Table 5, p. 5, row 12; `ORC-PFEFU2W4T2` |  |
| 910.7 | eutectic: L -> Mg (hcp) + Mg2Si | L: Si 0.0116; Mg (hcp): Si 3.000e-5; Mg2Si: Si 0.333 | experimental | [2] Schick 2012; _cites Raynor 1940_ | Table 5, p. 8, row 3; `ORC-CSWSFFTBRU` |  |
| 910.2 | eutectic: L -> Mg (hcp) + Mg2Si | L: Si 0.0146; Mg (hcp): Si 2.900e-5; Mg2Si: Si 0.333 | model | [2] Schick 2012 | Table 5, p. 8, row 7; `ORC-IK2FBMIXYE` |  |
| 910.15 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.015; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Schurmann 1977_ | Table 5, p. 5, row 19; `ORC-6CV7KAVQTF` |  |
| 910.15 | eutectic: L -> (Mg)-hcp + Mg2Si | L: Si 0.013; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Schurmann 1977_ | Table 5, p. 4, row 17; `ORC-CBKLMYY6YP` |  |
| 910 | eutectic: L -> Mg (hcp) + Mg2Si | L: Si 0.013; Mg2Si: Si 0.333 | experimental | [2] Schick 2012; _cites Schurmann 1977_ | Table 5, p. 8, row 6; `ORC-RBFDSKYTHL` |  |
| 905.15 | eutectic: L \<-> (Mg) + Mg2Si | L: Si 0.0208; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Sawamoto 1935_ | Table 5, p. 5, row 10; `ORC-3ZEFBQN6KQ` |  |
| 905.15 | eutectic: L -> (Mg)-hcp + Mg2Si | L: Si 0.0208; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Sawamoto 1935_ | Table 5, p. 4, row 9; `ORC-BWFTMP6XEP` |  |
| 898.15 | eutectic: L \<-> (Mg) + Mg2Si | Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [1] Yan 2000; _cites Woler 1926_ | Table 5, p. 5, row 6; `ORC-7KNY7YLPO2` |  |
| 898.15 | eutectic: L -> (Mg)-hcp + Mg2Si | Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Wohler 1926_ [doi](https://doi.org/10.1002/zaac.19261510102) | Table 5, p. 4, row 5; `ORC-JN4DIFDSB5` |  |
| 848.15 | eutectic: L -> (Mg)-hcp + Mg2Si | L: Si 0.0278; Mg2Si: Mg 0.666667, Si 0.333333 | experimental | [3] Yuan 2009; _cites Elchardus 1935_ | Table 5, p. 4, row 8; `ORC-HNYYZDDH2Q` |  |

## Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from [dft_parity.json](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, Mg–Si system (32)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -61.9 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [3] Yuan 2009; _cites ref. 1966Cau_ | Table 3, p. 3, row 6; `ORC-TVHTHUHXFG` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -29.7 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [3] Yuan 2009; _cites ref. 1971Bla_ | Table 3, p. 3, row 8; `ORC-E56JCQJWKX` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -29.7 kJ/mol-atom | 298.15 | model | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [2] Schick 2012; _cites Blachnik 1971_ | Table 3, p. 7, row 3; `ORC-TGU3PMLBRI` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -29.7 kJ/mol-atom | 298.15 | model | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000; _cites Chakraborti 1992_ [doi](https://doi.org/10.1016/0364-5916%2892%2990041-u) | Table 2, p. 4, row 8; `ORC-YAOI6N6R5H` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -27.9 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [3] Yuan 2009; _cites ref. 1963Rya_ | Table 3, p. 3, row 3; `ORC-6WSWRP4O2O` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -27.1 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [3] Yuan 2009; _cites ref. 1967Ger_ | Table 3, p. 3, row 7; `ORC-NAZH3V3DPB.bd04ab` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -26.67 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000; _cites Lukashenko 1964_ | Table 2, p. 4, row 4; `ORC-BQMOVUXMWI` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -26.47 kJ/mol-atom | 298.15 | model | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000; _cites Ludecke 1986_ | Table 2, p. 4, row 9; `ORC-N7FIHVHMXU` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -26.4 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [3] Yuan 2009; _cites ref. 1964Luk_ | Table 3, p. 3, row 4; `ORC-FMNPCEPMA2.5cc81c` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -26.4 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [2] Schick 2012; _cites Caulfield 1962_ | Table 3, p. 7, row 2; `ORC-NQ3FCXRLOR` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -26.37 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000; _cites Caulfield 1962_ | Table 2, p. 4, row 3; `ORC-WGV2LZGFYW` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -26.3 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000; _cites Kubaschewski 1949_ | Table 2, p. 4, row 1; `ORC-RRLRFVBSPR` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -26 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [2] Schick 2012; _cites Kubaschewski 1949_ | Table 3, p. 7, row 1; `ORC-CR5XFWSRX4` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -25.9 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [3] Yuan 2009; _cites ref. 1949Kub_ | Table 3, p. 3, row 1; `ORC-K5PA43HKL6` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -22.99 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000; _cites Eldridge 1967_ | Table 2, p. 4, row 5; `ORC-IT4ZCWCHUS` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -22.2 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [3] Yuan 2009; _cites ref. 1981Rao_ | Table 3, p. 3, row 9; `ORC-PNANYQB5BW.8c73dd` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -22.16 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000; _cites Rao 1981_ | Table 2, p. 4, row 6; `ORC-XT23ZMENP2` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -21.74 kJ/mol-atom | 298.15 | model | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000; _cites Feufel 1997_ [doi](https://doi.org/10.1016/s0925-8388%2896%2902655-2) | Table 2, p. 4, row 11; `ORC-7UMSNJ5ULE` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -21.37 kJ/mol-atom | 298.15 | model | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000 | Table 2, p. 4, row 12; `ORC-4P7GS3EMYE` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -21.1 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000; _cites Feufel 1997_ [doi](https://doi.org/10.1016/s0925-8388%2896%2902655-2) | Table 2, p. 4, row 7; `ORC-4NIT2EUNUZ` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -21.1 kJ/mol-atom | 298.15 | unspecified | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [2] Schick 2012 | Table 3, p. 7, row 10; `ORC-OXJBML6GVQ.768fd4` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -21.1 kJ/mol-atom | 298.15 | unspecified | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [2] Schick 2012; _cites Feufel 1997_ [doi](https://doi.org/10.1016/s0925-8388%2896%2902655-2) | Table 3, p. 7, row 4; `ORC-QWF4L54JOC` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -21.1 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [3] Yuan 2009; _cites ref. 1997Feu_ | Table 3, p. 3, row 10; `ORC-VU6QT2S3YK` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -21.01 kJ/mol-atom | 298.15 | model | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000; _cites Lukas 1994_ | Table 2, p. 4, row 10; `ORC-XE6ZN6IYQS` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -21 kJ/mol-atom |  | model | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [3] Yuan 2009 | Table 3, p. 3, row 13; `ORC-VOMZWQPFCW.1cdbae` |  |
| Mg2Si |  | -18.2 kJ/mol-atom | 0 | DFT |  |  | [3] Yuan 2009 | Table 3, p. 3, row 12; `ORC-5VIZ44FGIK` |  |
| Mg2Si |  | -17.7 kJ/mol-atom |  | DFT |  |  | [3] Yuan 2009; _cites ref. 2009Zha_ | Table 3, p. 3, row 11; `ORC-AP4XHDIAMA` |  |
| Mg2Si |  | -17.7 kJ/mol-atom | 298.15 | DFT |  |  | [2] Schick 2012; _cites Zhang 2009_ [doi](https://doi.org/10.1016/j.intermet.2009.03.017) | Table 3, p. 7, row 5; `ORC-FYZFTH4VM6` |  |
| Mg2Si |  | -16.7 kJ/mol-atom | 298.15 | DFT |  |  | [2] Schick 2012 | Table 3, p. 7, row 8; `ORC-3EP2RAVNHP.c91b91` |  |
| Mg2Si |  | -15.4 kJ/mol-atom | 298.15 | DFT |  |  | [2] Schick 2012 | Table 3, p. 7, row 9; `ORC-TKZQ4AI54G.9dc254` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -14.21 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [1] Yan 2000; _cites Grjotheim 1962_ | Table 2, p. 4, row 2; `ORC-I7FSVUPWML` |  |
| Mg2Si | [Mg2Si](https://data.orchid-project.org/compounds/Mg2Si.html) | -14.2 kJ/mol-atom | 298.15 | experimental | -12.42 (mp-aaaaacap) | -15.603 (oqmd-17649) | [3] Yuan 2009; _cites ref. 1962Grj_ | Table 3, p. 3, row 2; `ORC-QYTOKDYFUF.56456d` |  |

## Other properties

### Phase transition (2)

Table: Phase transition, Mg–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1346 K | 1346 | congruent melting | experimental | [2] Schick 2012 | p. 6; `ORC-ER77DIOG7F` | “Also the congruent melting temperature of Mg2 Si has been determined TL = 1346 K.” |
| Phase transition | 1350 K | 1350 | congruent melting: Mg2Si -> Liquid; _Mg2Si: Si 0.333; Liquid: Si 0.333_ | model | [4] (ed.) 1998 | Table I, p. 239, row 3; `ORC-GYFLQ22SSM` |  |

### Formation (17)

Table: Formation, Mg–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy of formation; _printed: ΔSf_ | -1.7 J/mol-atom/K |  | Mg2Si; _alloy: Si 0.333333_ | model | [3] Yuan 2009 | Table 3, p. 3, row 13; `ORC-VOMZWQPFCW.01a556` |  |
| Entropy of formation; _printed: ΔS_f,Mg2Si^298_ | -20.58 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | model | [1] Yan 2000; _cites Chakraborti 1992_ [doi](https://doi.org/10.1016/0364-5916%2892%2990041-u) | Table 3, p. 4, row 7; `ORC-4L57WAPZZ7` |  |
| Entropy of formation; _printed: ΔS_f,Mg2Si^298_ | -9.3 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [1] Yan 2000; _cites Lukashenko 1964_ | Table 3, p. 4, row 2; `ORC-564E5BCVDZ` |  |
| Entropy of formation; _printed: ΔS_f,Mg2Si^298_ | -9 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [1] Yan 2000; _cites Grjotheim 1962_ | Table 3, p. 4, row 1; `ORC-AOMGU2Q2AT` |  |
| Entropy of formation; _printed: ΔS_f,Mg2Si^298_ | -2.68 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [1] Yan 2000; _cites Geffken 1968_ | Table 3, p. 4, row 3; `ORC-CFJHPHYCDK` |  |
| Entropy of formation; _printed: ΔSf_ | -7.3 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [3] Yuan 2009; _cites ref. 1964Luk_ | Table 3, p. 3, row 4; `ORC-FMNPCEPMA2.f27526` |  |
| Entropy of formation; _printed: ΔS_f,Mg2Si^298_ | -2.7 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | model | [1] Yan 2000; _cites Lukas 1994_ | Table 3, p. 4, row 9; `ORC-G2THO5YWJI` |  |
| Entropy of formation; _printed: ΔS_f,Mg2Si^298_ | -5.37 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [1] Yan 2000; _cites Barin 1973_ | Table 3, p. 4, row 4; `ORC-J5DRCQJ734` |  |
| Entropy of formation; _printed: ΔSf_ | -2.7 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [3] Yuan 2009; _cites ref. 1967Ger_ | Table 3, p. 3, row 7; `ORC-NAZH3V3DPB.7006ec` |  |
| Entropy of formation; _printed: ΔSf_ | -4.7 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [3] Yuan 2009; _cites ref. 1981Rao_ | Table 3, p. 3, row 9; `ORC-PNANYQB5BW.9bc305` |  |
| Entropy of formation; _printed: ΔSf_ | 3.1 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [3] Yuan 2009; _cites ref. 1962Grj_ | Table 3, p. 3, row 2; `ORC-QYTOKDYFUF.66cf18` |  |
| Entropy of formation; _printed: ΔS_f,Mg2Si^298_ | -6.81 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [1] Yan 2000; _cites Kubaschewski 1979_ | Table 3, p. 4, row 5; `ORC-VZ7AMLGNXS` |  |
| Entropy of formation; _printed: ΔS_f,Mg2Si^298_ | -6.66667 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | model | [1] Yan 2000; _cites Ludecke 1986_ | Table 3, p. 4, row 8; `ORC-XFE2SU6O6U` |  |
| Entropy of formation; _printed: ΔSf_ | -0.5 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [3] Yuan 2009; _cites ref. 1965Man_ | Table 3, p. 3, row 5; `ORC-YOAQKOG2OX` |  |
| Entropy of formation; _printed: ΔS_f,Mg2Si^298_ | -2.68 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | model | [1] Yan 2000; _cites Feufel 1997_ [doi](https://doi.org/10.1016/s0925-8388%2896%2902655-2) | Table 3, p. 4, row 10; `ORC-ZAQDJ3LAM2` |  |
| Entropy of formation; _printed: ΔS_f,Mg2Si^298_ | -4.95667 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | model | [1] Yan 2000 | Table 3, p. 4, row 11; `ORC-ZXD4I5KM3X` |  |
| Entropy of formation; _printed: ΔS_f,Mg2Si^298_ | -4.72667 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [1] Yan 2000; _cites Rao 1981_ | Table 3, p. 4, row 6; `ORC-ZXJQFJJWA5` |  |

### Mixing / partial (24)

Table: Mixing / partial, Mg–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Enthalpy of mixing; _printed: Δ^{E,0}H\_{Mg+Si}_ | 19.64 kJ/mol (basis unstated) ± 1.18 | 1000 | liquid | experimental | [5] Feufel 1997 | Table 3, p. 3, row 12; `ORC-CVVTUJTZZ7.dc1ee0` |  |
| Enthalpy of mixing; _printed: Δ\*H\_{Mg+Si}_ | 23.84 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.991, Si 0.009_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 9; `ORC-DD5UK6AI2N.5ee5f2` |  |
| Enthalpy of mixing; _printed: Δ\*H\_{Mg+Si}_ | 21.71 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.994, Si 0.006_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 2; `ORC-EZOJ54UTJL.13bace` |  |
| Enthalpy of mixing; _printed: Δ\*H\_{Mg+Si}_ | 21.02 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.991, Si 0.009_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 3; `ORC-EZXA3AOMX6.d5c4df` |  |
| Enthalpy of mixing; _printed: Δ\*H\_{Mg+Si}_ | 22.15 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.989, Si 0.011_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 4; `ORC-FEWFJ26CW3.5dd48d` |  |
| Enthalpy of mixing; _printed: Δ\*H\_{Mg+Si}_ | 22.67 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.983, Si 0.017_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 6; `ORC-FKLR6ZOIAM.12852c` |  |
| Enthalpy of mixing; _printed: Δ\*H\_{Mg+Si}_ | 19.72 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.994, Si 0.006_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 8; `ORC-GUQUGAGYIH.ce5c2e` |  |
| Enthalpy of mixing; _printed: Δ\*H\_{Mg+Si}_ | 20.62 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.996, Si 0.004_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 1; `ORC-H7ENJQDUJ6.99b80a` |  |
| Enthalpy of mixing; _printed: Δ\*H\_{Mg+Si}_ | 21.05 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.986, Si 0.014_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 5; `ORC-KZ4NUZIU52.c1915b` |  |
| Enthalpy of mixing; _printed: Δ\*H\_{Mg+Si}_ | 22.55 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.987, Si 0.013_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 10; `ORC-N7L5QACI4E.857ed3` |  |
| Enthalpy of mixing; _printed: Δ\*H\_{Mg+Si}_ | 19.27 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.997, Si 0.003_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 7; `ORC-TUGV4SW2TT.547377` |  |
| Enthalpy of mixing; _printed: Δ\*H\_{Mg+Si}_ | 23.26 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.984, Si 0.016_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 11; `ORC-X4SKYZSGBZ.13a479` |  |
| Partial enthalpy; _printed: ΔE,0 H Mg+Si (infinite dilution)_ | 19.64 kJ/mol (basis unstated) ± 1.18 | 1000 | UNKNOWN | experimental | [5] Feufel 1997 | Table 3, p. 3, row 12; `ORC-CVVTUJTZZ7.63a900` |  |
| Partial enthalpy; _printed: Enthalpy of solution ΔE H Mg+Si_ | 23.84 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.991, Si 0.009_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 9; `ORC-DD5UK6AI2N.e98814` |  |
| Partial enthalpy; _printed: Enthalpy of solution ΔE H Mg+Si_ | 21.71 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.994, Si 0.006_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 2; `ORC-EZOJ54UTJL.ea1581` |  |
| Partial enthalpy; _printed: Enthalpy of solution ΔE H Mg+Si_ | 21.02 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.991, Si 0.009_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 3; `ORC-EZXA3AOMX6.e96819` |  |
| Partial enthalpy; _printed: Enthalpy of solution ΔE H Mg+Si_ | 22.15 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.989, Si 0.011_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 4; `ORC-FEWFJ26CW3.9ee490` |  |
| Partial enthalpy; _printed: Enthalpy of solution ΔE H Mg+Si_ | 22.67 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.983, Si 0.017_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 6; `ORC-FKLR6ZOIAM.635798` |  |
| Partial enthalpy; _printed: Enthalpy of solution ΔE H Mg+Si_ | 19.72 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.994, Si 0.006_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 8; `ORC-GUQUGAGYIH.1e6b94` |  |
| Partial enthalpy; _printed: Enthalpy of solution ΔE H Mg+Si_ | 20.62 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.996, Si 0.004_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 1; `ORC-H7ENJQDUJ6.0982e9` |  |
| Partial enthalpy; _printed: Enthalpy of solution ΔE H Mg+Si_ | 21.05 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.986, Si 0.014_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 5; `ORC-KZ4NUZIU52.958b29` |  |
| Partial enthalpy; _printed: Enthalpy of solution ΔE H Mg+Si_ | 22.55 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.987, Si 0.013_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 10; `ORC-N7L5QACI4E.8e53e5` |  |
| Partial enthalpy; _printed: Enthalpy of solution ΔE H Mg+Si_ | 19.27 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.997, Si 0.003_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 7; `ORC-TUGV4SW2TT.dac134` |  |
| Partial enthalpy; _printed: Enthalpy of solution ΔE H Mg+Si_ | 23.26 kJ/mol (basis unstated) | 1000 | liquid; _alloy: Mg 0.984, Si 0.016_ | experimental | [5] Feufel 1997 | Table 3, p. 3, row 11; `ORC-X4SKYZSGBZ.91cd35` |  |

### Heat capacity / entropy / enthalpy (62)

Table: Heat capacity / entropy / enthalpy, Mg–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: °S298_ | 25.5 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | DFT | [2] Schick 2012 | Table 3, p. 7, row 8; `ORC-3EP2RAVNHP.48e3a8` |  |
| Entropy; _printed: °S298_ | 27.6 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012; _cites Mannchen 1965_ [doi](https://doi.org/10.1515/znb-1965-0218) | Table 3, p. 7, row 6; `ORC-FLICYKGIIJ` |  |
| Entropy; _printed: °S298_ | 25.3 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | unspecified | [2] Schick 2012 | Table 3, p. 7, row 10; `ORC-OXJBML6GVQ.ffe75c` |  |
| Entropy; _printed: °S298_ | 26.4 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | DFT | [2] Schick 2012 | Table 3, p. 7, row 9; `ORC-TKZQ4AI54G.d24650` |  |
| Entropy; _printed: °S298_ | 25.3 J/mol-atom/K | 298.15 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012; _cites Gerstein 1967_ [doi](https://doi.org/10.1063/1.1712243) | Table 3, p. 7, row 7; `ORC-UJBRTZBL7N` |  |
| Heat capacity; _printed: Cp_ | 23.2 J/mol-atom/K ± 0.5 | 363 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 1; `ORC-GH7U4XTBVB` |  |
| Heat capacity; _printed: Cp_ | 23.35 J/mol-atom/K ± 0.5 | 383 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 2; `ORC-45PCIV5J5E` |  |
| Heat capacity; _printed: Cp_ | 23.5 J/mol-atom/K ± 0.5 | 403 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 3; `ORC-E3RXDXORFP` |  |
| Heat capacity; _printed: Cp_ | 23.65 J/mol-atom/K ± 0.5 | 423 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 4; `ORC-N5ELPG3PEA` |  |
| Heat capacity; _printed: Cp_ | 23.7 J/mol-atom/K ± 0.5 | 443 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 5; `ORC-BKHQDGCW7O` |  |
| Heat capacity; _printed: Cp_ | 23.8 J/mol-atom/K ± 0.5 | 463 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 6; `ORC-VTFFMX56E5` |  |
| Heat capacity; _printed: Cp_ | 25.12 J/mol-atom/K | 473 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 1; `ORC-SZ27UHTPAP.732a05` |  |
| Heat capacity; _printed: Cp_ | 23.45 J/mol-atom/K | 473 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 1; `ORC-SZ27UHTPAP.774d35` |  |
| Heat capacity; _printed: Cp_ | 23.9 J/mol-atom/K ± 0.5 | 483 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 7; `ORC-SRXWDOPAEK` |  |
| Heat capacity; _printed: Cp_ | 23.63 J/mol-atom/K | 493 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 2; `ORC-MMLUA4KJMN.52348e` |  |
| Heat capacity; _printed: Cp_ | 25.26 J/mol-atom/K | 493 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 2; `ORC-MMLUA4KJMN.67a5ad` |  |
| Heat capacity; _printed: Cp_ | 24 J/mol-atom/K ± 0.5 | 503 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 8; `ORC-CN5CHCIBKV` |  |
| Heat capacity; _printed: Cp_ | 23.8 J/mol-atom/K | 513 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 3; `ORC-4YXFQ4ZRYX.6d85ee` |  |
| Heat capacity; _printed: Cp_ | 25.41 J/mol-atom/K | 513 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 3; `ORC-4YXFQ4ZRYX.994b18` |  |
| Heat capacity; _printed: Cp_ | 24.1 J/mol-atom/K ± 0.5 | 523 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 9; `ORC-NZ7AR4A2I3` |  |
| Heat capacity; _printed: Cp_ | 23.98 J/mol-atom/K | 533 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 4; `ORC-QMZJEX7BHD.50cf55` |  |
| Heat capacity; _printed: Cp_ | 25.54 J/mol-atom/K | 533 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 4; `ORC-QMZJEX7BHD.6ecd7a` |  |
| Heat capacity; _printed: Cp_ | 24.2 J/mol-atom/K ± 0.5 | 543 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 10; `ORC-6UMIRMG7DS` |  |
| Heat capacity; _printed: Cp_ | 24.12 J/mol-atom/K | 553 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 5; `ORC-7G23CBNW46.74a375` |  |
| Heat capacity; _printed: Cp_ | 25.7 J/mol-atom/K | 553 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 5; `ORC-7G23CBNW46.88f04f` |  |
| Heat capacity; _printed: Cp_ | 24.25 J/mol-atom/K ± 0.5 | 563 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 11; `ORC-GYI2XSQTVH` |  |
| Heat capacity; _printed: Cp_ | 25.88 J/mol-atom/K | 573 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 6; `ORC-JXU7RLOV22.589a41` |  |
| Heat capacity; _printed: Cp_ | 24.32 J/mol-atom/K | 573 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 6; `ORC-JXU7RLOV22.ab8442` |  |
| Heat capacity; _printed: Cp_ | 24.3 J/mol-atom/K ± 0.5 | 583 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 12; `ORC-5FLUIEC3GZ` |  |
| Heat capacity; _printed: Cp_ | 26.07 J/mol-atom/K | 593 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 7; `ORC-IIVLC4GRG6.2749fa` |  |
| Heat capacity; _printed: Cp_ | 24.53 J/mol-atom/K | 593 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 7; `ORC-IIVLC4GRG6.c0a300` |  |
| Heat capacity; _printed: Cp_ | 24.3 J/mol-atom/K ± 0.5 | 603 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 13; `ORC-UYNHHAUDDP` |  |
| Heat capacity; _printed: Cp_ | 26.27 J/mol-atom/K | 613 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 8; `ORC-NDS7G2BINE.878f28` |  |
| Heat capacity; _printed: Cp_ | 24.74 J/mol-atom/K | 613 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 8; `ORC-NDS7G2BINE.e8d779` |  |
| Heat capacity; _printed: Cp_ | 24.45 J/mol-atom/K ± 0.5 | 623 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 14; `ORC-5EZRJRQ5V6` |  |
| Heat capacity; _printed: Cp_ | 24.95 J/mol-atom/K | 633 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 9; `ORC-U32QJAYGET.07f50e` |  |
| Heat capacity; _printed: Cp_ | 26.46 J/mol-atom/K | 633 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 9; `ORC-U32QJAYGET.ace621` |  |
| Heat capacity; _printed: Cp_ | 24.7 J/mol-atom/K ± 0.5 | 643 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 15; `ORC-XWHBO6WRRY` |  |
| Heat capacity; _printed: Cp_ | 25.14 J/mol-atom/K | 653 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 10; `ORC-C7M3WPNJL3.6d0e35` |  |
| Heat capacity; _printed: Cp_ | 26.65 J/mol-atom/K | 653 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 10; `ORC-C7M3WPNJL3.f34470` |  |
| Heat capacity; _printed: Cp_ | 24.95 J/mol-atom/K ± 0.5 | 663 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 16; `ORC-X2BVFNH6ZV` |  |
| Heat capacity; _printed: Cp_ | 26.81 J/mol-atom/K | 673 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 11; `ORC-C5WUQTGSIS.40195d` |  |
| Heat capacity; _printed: Cp_ | 25.3 J/mol-atom/K | 673 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 11; `ORC-C5WUQTGSIS.495b52` |  |
| Heat capacity; _printed: Cp_ | 25.3 J/mol-atom/K ± 0.5 | 683 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 17; `ORC-IYSRVYIFHF` |  |
| Heat capacity; _printed: Cp_ | 25.43 J/mol-atom/K | 693 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 12; `ORC-JAXMQJWGAZ.56716d` |  |
| Heat capacity; _printed: Cp_ | 26.94 J/mol-atom/K | 693 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 12; `ORC-JAXMQJWGAZ.ff4911` |  |
| Heat capacity; _printed: Cp_ | 25.5 J/mol-atom/K ± 0.5 | 703 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 18; `ORC-LD55S7QAMA` |  |
| Heat capacity; _printed: Cp_ | 27.04 J/mol-atom/K | 713 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 13; `ORC-XJ7UZ36IHH.567998` |  |
| Heat capacity; _printed: Cp_ | 25.52 J/mol-atom/K | 713 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 13; `ORC-XJ7UZ36IHH.917efb` |  |
| Heat capacity; _printed: Cp_ | 25.7 J/mol-atom/K ± 0.5 | 723 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 19; `ORC-ZIUDPR7GD4` |  |
| Heat capacity; _printed: Cp_ | 25.55 J/mol-atom/K | 733 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 14; `ORC-MNDEPH4I7O.c7dc1e` |  |
| Heat capacity; _printed: Cp_ | 27.08 J/mol-atom/K | 733 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 14; `ORC-MNDEPH4I7O.ea2d17` |  |
| Heat capacity; _printed: Cp_ | 25.9 J/mol-atom/K ± 0.5 | 743 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 20; `ORC-KNODUZ7WM7` |  |
| Heat capacity; _printed: Cp_ | 25.53 J/mol-atom/K | 753 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 15; `ORC-XSTB7FDDSL.65d38c` |  |
| Heat capacity; _printed: Cp_ | 27.07 J/mol-atom/K | 753 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 15; `ORC-XSTB7FDDSL.771649` |  |
| Heat capacity; _printed: Cp_ | 26.05 J/mol-atom/K ± 0.5 | 763 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 21; `ORC-XUN66SPZKV` |  |
| Heat capacity; _printed: Cp_ | 25.43 J/mol-atom/K | 773 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 16; `ORC-7UNHT7Y5ZC.004be0` |  |
| Heat capacity; _printed: Cp_ | 27 J/mol-atom/K | 773 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 16; `ORC-7UNHT7Y5ZC.d952a0` |  |
| Heat capacity; _printed: Cp_ | 25.8 J/mol-atom/K ± 0.5 | 783 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 22; `ORC-A3CSOQESVH` |  |
| Heat capacity; _printed: Cp_ | 26.85 J/mol-atom/K | 793 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 17; `ORC-UZZUDONX6Y.c8049b` |  |
| Heat capacity; _printed: Cp_ | 25.25 J/mol-atom/K | 793 | Mg2Si; _alloy: Si 0.333333_ | experimental | [2] Schick 2012 | Table 2, p. 7, row 17; `ORC-UZZUDONX6Y.c96a13` |  |
| Heat capacity; _printed: Cp_ | 25.65 J/mol-atom/K ± 0.5 | 803 | Mg2Si; _alloy: Si 0.333333_ | experimental | [5] Feufel 1997 | Table 5, p. 4, row 23; `ORC-IBSFAEN5EH` |  |

### Crystal structure (1)

Table: Crystal structure, Mg–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 6.347 Å ± 0.004 | 298.15 | Mg2Si; _alloy: Mg 0.666667, Si 0.333333_ | model | [6] Zhou 2010; _cites Villars 1991_ | Table 1, p. 3, row 13; `ORC-6EAHMIRD2G` |  |

### Other property (1)

Table: Other property, Mg–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Other; _printed: 1Hr_ | -19.7 unspecified ± 1.2 | 1215 |  | experimental | [2] Schick 2012 | p. 7; `ORC-HIEG67KFVU` | “Using the procedure described in Section 3.2.3 we obtained 1Hr = -19.7 ± 1.2 kJ/mol-atoms for the reaction L → Mg2 Si + Si (diamond) from DSC measurements and determined the eutectic temperature at Te = 1215 K.” |

## Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

1. Xin-Yan Yan, Y. A. Chang, F. Zhang, A thermodynamic analysis of the Mg-Si system, JPE 21, 379-384 (2000). [doi:10.1361/105497100770339914](https://doi.org/10.1361/105497100770339914)
2. Michael Schick, Bengt Hallstedt, Albert Glensk, Blazej Grabowski, Tilmann Hickel, Milan Hampl et al., Combined ab initio, experimental, and CALPHAD approach for an improved thermodynamic evaluation of the Mg–Si system, Calphad 37, 77-86 (2012). [doi:10.1016/j.calphad.2012.02.001](https://doi.org/10.1016/j.calphad.2012.02.001)
3. Xiaoming Yuan, Weihua Sun, Yong Du, Dongdong Zhao, Huaming Yang, Thermodynamic modeling of the Mg–Si system with the Kaptay equation for the excess Gibbs energy of the liquid phase, Calphad 33, 673-678 (2009). [doi:10.1016/j.calphad.2009.08.004](https://doi.org/10.1016/j.calphad.2009.08.004)
4. I. Ansara, A. T. Dinsdale, M. H. Rand (eds.), COST 507: Thermochemical database for light metal alloys, Volume 2, EUR 18499 EN, Office for Official Publications of the European Communities, Luxembourg (1998), ISBN 92-828-3902-8.
5. Harald Feufel, Tilo Gödecke, Hans Leo Lukas, Ferdinand Sommer, Investigation of the Al-Mg-Si system by experiments and thermodynamic calculations, Journal of Alloys and Compounds 247, 31-42 (1997). [doi:10.1016/s0925-8388(96)02655-2](https://doi.org/10.1016/s0925-8388%2896%2902655-2)
6. Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171)

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735859
- R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735891
- R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0).

Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

```bibtex
@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).