# Mg–Y system

> Mg–Y system: 53 accepted literature values (invariant reaction 25, crystal structure 12, formation 10, activity / EMF / Gibbs energy 6) and 5 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

53 accepted literature values from 5 paper(s) (experimental 20, model 28, unspecified 5); 5 calculated phase diagram(s). 2 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-Y.json) · [CSV](https://data.orchid-project.org/systems/MG-Y.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#MG-Y) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#MG-Y/MgY-03Fab-LB.json) · [phases (10)](https://data.orchid-project.org/phases/pages/MG-Y.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/MG-Y.html) · [Markdown](https://data.orchid-project.org/systems/MG-Y.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 20 |
| model | 28 |
| unspecified | 5 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 25 |
| formation | 10 |
| activity / EMF / Gibbs energy | 6 |
| crystal structure | 12 |

## 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 |
|---|---|---|---|
| MgY-03Fab-LB.tdb | O.B. Fabrichnaya, H.L. Lukas, G. Effenberg, F. Aldinger, Intermet., 11, 1183-88(2003). [doi:10.1016/S0966-9795(03)00156-0](https://doi.org/10.1016/S0966-9795%2803%2900156-0) | `26a9863a7b6f6b5a155a1ae23b55a67676a481dd5eba3a703bb797d0c95f3408` | [viewer](https://orchid-project.org/phase-diagrams/#MG-Y/MgY-03Fab-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgY-03Fab-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgY-03Fab-LB.json) |
| MgY-07Guo.tdb | C. Guo, Z. Du, C. Li, Calphad, 31, 75-88 (2007). [doi:10.1016/j.calphad.2006.10.004](https://doi.org/10.1016/j.calphad.2006.10.004) | `088dfa98084813228daca365dc475a7be7f37104e29f30e55a46ac88f23eb246` | [viewer](https://orchid-project.org/phase-diagrams/#MG-Y/MgY-07Guo.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgY-07Guo.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgY-07Guo.json) |
| MgY-07Men.tdb | F. Meng, H. Liu, L. Liu, Z. Jin, Trans. Nonferrous Met. Soc. China, 17, 77-81(2007). | `c1079ef1bb67c5741bc31dace5d6fa929af1c01bee9605047d352afc982b91d1` | [viewer](https://orchid-project.org/phase-diagrams/#MG-Y/MgY-07Men.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgY-07Men.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgY-07Men.json) |
| MgY-20Wu.tdb | X. Wu, C. Li, C. Guo, Z. Du, Calphad, 71, 102010(2020). [doi:10.1016/j.calphad.2020.102010](https://doi.org/10.1016/j.calphad.2020.102010) | `a3ac87fad28934c61b0aba0fe2caf3ecd5eef20e883f3dc18c1a06ccd91c2434` | [viewer](https://orchid-project.org/phase-diagrams/#MG-Y/MgY-20Wu.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgY-20Wu.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgY-20Wu.json) |
| MgY-98Luk.tdb | H.L. Lukas, COST 507, Final report round 2, 1998. | `68740131a132fee3651ec3eb1fd044d3a56428ed2828054a4818d2079e1115cc` | [viewer](https://orchid-project.org/phase-diagrams/#MG-Y/MgY-98Luk.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgY-98Luk.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgY-98Luk.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| MgY-03Fab-LB.tdb | 1215.19 | LIQUID (x(Y) 0.47175) + B2_BCC#2 (x(Y) 0.49829) + B2_BCC (x(Y) 0.57956) |
| MgY-03Fab-LB.tdb | 1215.19 | LIQUID (x(Y) 0.47175) + B2_BCC (x(Y) 0.49829) + BCC_A2 (x(Y) 0.57956) |
| MgY-03Fab-LB.tdb | 1215.19 | LIQUID (x(Y) 0.47175) + B2_BCC (x(Y) 0.49829) + B2_BCC#2 (x(Y) 0.57956) |
| MgY-03Fab-LB.tdb | 1055.5 | LIQUID (x(Y) 0.28869) + C14_LAVES (x(Y) 0.3226) + B2_BCC (x(Y) 0.46607) |
| MgY-03Fab-LB.tdb | 1055.5 | LIQUID (x(Y) 0.28869) + C14_LAVES (x(Y) 0.3226) + B2_BCC (x(Y) 0.46607) |
| MgY-03Fab-LB.tdb | 1047.17 | B2_BCC (x(Y) 0.50479) + BCC_A2 (x(Y) 0.69008) + HCP_A3 (x(Y) 0.79706) |
| MgY-03Fab-LB.tdb | 1047.17 | B2_BCC (x(Y) 0.50479) + B2_BCC#2 (x(Y) 0.69008) + HCP_A3 (x(Y) 0.79706) |
| MgY-03Fab-LB.tdb | 1047.17 | B2_BCC (x(Y) 0.50479) + B2_BCC#2 (x(Y) 0.69008) + HCP_A3 (x(Y) 0.79706) |
| MgY-03Fab-LB.tdb | 887.65 | LIQUID (x(Y) 0.141) + MG24Y5_A12 (x(Y) 0.16042) + C14_LAVES (x(Y) 0.26419) |
| MgY-03Fab-LB.tdb | 844.94 | HCP_A3 (x(Y) 0.03456) + LIQUID (x(Y) 0.08177) + MG24Y5_A12 (x(Y) 0.13507) |
| MgY-07Guo.tdb | 1212.87 | LIQUID (x(Y) 0.48047) + B2_BCC#2 (x(Y) 0.50001) + B2_BCC (x(Y) 0.60226) |
| MgY-07Guo.tdb | 1212.87 | LIQUID (x(Y) 0.48047) + B2_BCC (x(Y) 0.50001) + BCC_A2 (x(Y) 0.60226) |
| MgY-07Guo.tdb | 1057.7 | LIQUID (x(Y) 0.30963) + C14_LAVES (x(Y) 0.32779) + B2_BCC (x(Y) 0.46304) |
| MgY-07Guo.tdb | 1047.75 | B2_BCC (x(Y) 0.50804) + BCC_A2 (x(Y) 0.68764) + HCP_A3 (x(Y) 0.77173) |
| MgY-07Guo.tdb | 1047.75 | B2_BCC (x(Y) 0.50804) + B2_BCC#2 (x(Y) 0.68764) + HCP_A3 (x(Y) 0.77173) |
| MgY-07Guo.tdb | 889.17 | LIQUID (x(Y) 0.1448) + MG24Y5_A12 (x(Y) 0.163) + C14_LAVES (x(Y) 0.26594) |
| MgY-07Guo.tdb | 841.43 | HCP_A3 (x(Y) 0.03633) + LIQUID (x(Y) 0.08455) + MG24Y5_A12 (x(Y) 0.14103) |
| MgY-07Men.tdb | 1213.54 | LIQUID (x(Y) 0.47063) + B2_BCC#2 (x(Y) 0.50075) + B2_BCC (x(Y) 0.57829) |
| MgY-07Men.tdb | 1213.54 | LIQUID (x(Y) 0.47063) + B2_BCC (x(Y) 0.50075) + B2_BCC#2 (x(Y) 0.57829) |
| MgY-07Men.tdb | 1055.96 | LIQUID (x(Y) 0.28995) + C14_LAVES (x(Y) 0.32293) + B2_BCC (x(Y) 0.46729) |
| MgY-07Men.tdb | 1055.96 | LIQUID (x(Y) 0.28995) + C14_LAVES (x(Y) 0.32293) + B2_BCC (x(Y) 0.46729) |
| MgY-07Men.tdb | 1047.94 | B2_BCC (x(Y) 0.50861) + B2_BCC#2 (x(Y) 0.6903) + HCP_A3 (x(Y) 0.79723) |
| MgY-07Men.tdb | 1047.94 | B2_BCC (x(Y) 0.50861) + B2_BCC#2 (x(Y) 0.6903) + HCP_A3 (x(Y) 0.79723) |
| MgY-07Men.tdb | 887.65 | LIQUID (x(Y) 0.141) + MG24Y5_A12 (x(Y) 0.16042) + C14_LAVES (x(Y) 0.26419) |
| MgY-07Men.tdb | 844.94 | HCP_A3 (x(Y) 0.03456) + LIQUID (x(Y) 0.08177) + MG24Y5_A12 (x(Y) 0.13507) |
| MgY-20Wu.tdb | 1751.15 | MG7Y (x(Y) 1) + B2_BCC (x(Y) 1) + BCC_A2 (x(Y) 1) |
| MgY-20Wu.tdb | 1213.76 | LIQUID (x(Y) 0.4751) + B2_BCC#2 (x(Y) 0.5028) + B2_BCC (x(Y) 0.5956) |
| MgY-20Wu.tdb | 1213.76 | LIQUID (x(Y) 0.4751) + B2_BCC (x(Y) 0.5028) + B2_BCC#2 (x(Y) 0.5956) |
| MgY-20Wu.tdb | 1213.76 | LIQUID (x(Y) 0.4751) + B2_BCC (x(Y) 0.5028) + BCC_A2 (x(Y) 0.5956) |
| MgY-20Wu.tdb | 1058.98 | LIQUID (x(Y) 0.2947) + C14_LAVES (x(Y) 0.32203) + B2_BCC (x(Y) 0.47445) |
| MgY-20Wu.tdb | 1058.98 | LIQUID (x(Y) 0.2947) + C14_LAVES (x(Y) 0.32203) + B2_BCC (x(Y) 0.47445) |
| MgY-20Wu.tdb | 1047.99 | B2_BCC (x(Y) 0.5089) + B2_BCC#2 (x(Y) 0.70036) + HCP_A3 (x(Y) 0.8134) |
| MgY-20Wu.tdb | 1047.99 | B2_BCC (x(Y) 0.5089) + B2_BCC#2 (x(Y) 0.70036) + HCP_A3 (x(Y) 0.8134) |
| MgY-20Wu.tdb | 1047.99 | B2_BCC (x(Y) 0.5089) + BCC_A2 (x(Y) 0.70036) + MG7Y (x(Y) 0.8134) |
| MgY-20Wu.tdb | 888.28 | LIQUID (x(Y) 0.14452) + MG24Y5_A12 (x(Y) 0.16329) + C14_LAVES (x(Y) 0.26254) |
| MgY-20Wu.tdb | 844.06 | HCP_A3 (x(Y) 0.03667) + LIQUID (x(Y) 0.08241) + MG24Y5_A12 (x(Y) 0.14036) |
| MgY-20Wu.tdb | 844.06 | MG7Y (x(Y) 0.03667) + LIQUID (x(Y) 0.08241) + MG24Y5_A12 (x(Y) 0.14036) |
| MgY-98Luk.tdb | 1215.82 | LIQUID (x(Y) 0.47401) + MGY_B2 (x(Y) 0.49428) + BCC_A2 (x(Y) 0.59642) |
| MgY-98Luk.tdb | 1096.08 | MGY_B2 (x(Y) 0.49856) + BCC_A2 (x(Y) 0.6979) + HCP_A3 (x(Y) 0.81559) |
| MgY-98Luk.tdb | 1060.63 | LIQUID (x(Y) 0.27527) + MG2Y_C14 (x(Y) 0.33333) + MGY_B2 (x(Y) 0.47349) |
| MgY-98Luk.tdb | 1060.63 | LIQUID (x(Y) 0.27546) + MG2Y_C14 (x(Y) 0.33333) + MGY_B2 (x(Y) 0.47353) |
| MgY-98Luk.tdb | 891.96 | LIQUID (x(Y) 0.14539) + MG24Y5_A12 (x(Y) 0.163) + MG2Y_C14 (x(Y) 0.33333) |
| MgY-98Luk.tdb | 891.96 | LIQUID (x(Y) 0.14512) + MG24Y5_A12 (x(Y) 0.16294) + MG2Y_C14 (x(Y) 0.33333) |
| MgY-98Luk.tdb | 849.59 | HCP_A3 (x(Y) 0.04262) + LIQUID (x(Y) 0.08121) + MG24Y5_A12 (x(Y) 0.13623) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/MG/MG-Y.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/MG/MG-Y.json) · [CALPHAD hull MgY-03Fab-LB](https://data.orchid-project.org/hulls/calphad-sgte/MG/MG-Y--MgY-03Fab-LB.json) · [CALPHAD hull MgY-07Guo](https://data.orchid-project.org/hulls/calphad-sgte/MG/MG-Y--MgY-07Guo.json) · [CALPHAD hull MgY-07Men](https://data.orchid-project.org/hulls/calphad-sgte/MG/MG-Y--MgY-07Men.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Mg–Y system (25)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1215 | peritectic: L + (βY) -> Y1-xMg | L: Y 0.472; (βY): Y 0.58; Y1-xMg: Y 0.498 | model | [1] Fabrichnaya 2003 | Table 3, p. 4, row 2; `ORC-2N5GWYYYM6` |  |
| 1213.3 | peritectic: Liquid + bcc-A2 -> MgY | L: Y 0.466; bcc-A2: Y 0.588; MgY: Y 0.494 | model | [2] (ed.) 1998 | Table I, p. 242, row 1; `ORC-M4CVV44NGQ` |  |
| 1213 | peritectic: L + (βY) -> Y1-xMg | L: Y 0.466; (βY): Y 0.588; Y1-xMg: Y 0.494 | experimental | [1] Fabrichnaya 2003; _cites Fabrichnaya_ | Table 3, p. 4, row 1; `ORC-PG3CQZ6MKZ` |  |
| 1213 | eutectic: liq. -> MgY + bcc(Y) | liq.: Y 0.45; MgY: Y 0.5; bcc(Y): Y 0.605 | experimental | [3] Guo 2007; _cites Nayeb-Hashemi 1988_ | Table 2, p. 8, row 4; `ORC-RUALSANOWZ` |  |
| 1213 | eutectic: liq. -> MgY + bcc(Y) | liq.: Y 0.4805; MgY: Y 0.5; bcc(Y): Y 0.6023 | model | [3] Guo 2007 | Table 2, p. 8, row 3; `ORC-SHKLQ3BHYP` |  |
| 1058.5 | peritectic: Liquid + MgY -> Mg2Y | L: Y 0.276; MgY: Y 0.474; Mg2Y: Y 0.333 | model | [2] (ed.) 1998 | Table I, p. 242, row 2; `ORC-6FFFRWZSC3` |  |
| 1058 | peritectic: L + Y1-xMg -> Y1-xMg2 | L: Y 0.276; Y1-xMg: Y 0.474; Y1-xMg2: Y 0.333 | experimental | [1] Fabrichnaya 2003; _cites Fabrichnaya_ | Table 3, p. 4, row 3; `ORC-QKDL2FZDIY` |  |
| 1058 | liq. + MgY -> Mg2Y | liq.: Y 0.3096; MgY: Y 0.463; Mg2Y: Y 0.3278 | model | [3] Guo 2007 | Table 2, p. 8, row 5; `ORC-UJWJV4WZ2C` |  |
| 1056 | peritectic: L + Y1-xMg -> Y1-xMg2 | L: Y 0.289; Y1-xMg: Y 0.466; Y1-xMg2: Y 0.323 | model | [1] Fabrichnaya 2003 | Table 3, p. 4, row 4; `ORC-NZWAQ6WUD2` |  |
| 1053 | liq. + MgY -> Mg2Y | liq.: Y 0.263; MgY: Y 0.48; Mg2Y: Y 0.333 | experimental | [3] Guo 2007; _cites Nayeb-Hashemi 1988_ | Table 2, p. 8, row 6; `ORC-7M7U7FCPYG` |  |
| 1048 | bcc(Y) -> MgY + hcp(Y) | bcc(Y): Y 0.69; MgY: Y 0.5; hcp(Y): Y 0.84 | experimental | [3] Guo 2007; _cites Nayeb-Hashemi 1988_ | Table 2, p. 8, row 2; `ORC-5P2NNWKCZS` |  |
| 1048 | eutectoid: bcc-A2 -> MgY + hcp-A3 | bcc-A2: Y 0.717; MgY: Y 0.499; hcp-A3: Y 0.841 | model | [2] (ed.) 1998 | Table I, p. 242, row 5; `ORC-ASST75ANHJ` |  |
| 1048 | eutectoid: (βY) -> (αY) + Y1-xMg | (βY): Y 0.717; (αY): Y 0.841; Y1-xMg: Y 0.499 | experimental | [1] Fabrichnaya 2003; _cites Fabrichnaya_ | Table 3, p. 4, row 5; `ORC-OCPY52HA6I` |  |
| 1048 | bcc(Y) -> MgY + hcp(Y) | bcc(Y): Y 0.6876; MgY: Y 0.508; hcp(Y): Y 0.7717 | model | [3] Guo 2007 | Table 2, p. 8, row 1; `ORC-RSLBJKCSEW` |  |
| 1047 | eutectoid: (βY) -> (αY) + Y1-xMg | (βY): Y 0.69; (αY): Y 0.797; Y1-xMg: Y 0.505 | model | [1] Fabrichnaya 2003 | Table 3, p. 4, row 6; `ORC-KTZKOVBDUM` |  |
| 890 | peritectic: L + Y1-xMg2 -> Y5-xMg24 | L: Y 0.146; Y1-xMg2: Y 0.26; Y5-xMg24: Y 0.163 | experimental | [1] Fabrichnaya 2003; _cites Fabrichnaya_ | Table 3, p. 4, row 7; `ORC-52SKPQHGYX` |  |
| 890 | liq. + Mg2Y -> Mg24Y5 | liq.: Y 0.125; Mg2Y: Y 0.26; Mg24Y5: Y 0.172 | experimental | [3] Guo 2007; _cites Nayeb-Hashemi 1988_ | Table 2, p. 8, row 8; `ORC-P2ZSUNE4VE` |  |
| 889.4 | peritectic: Liquid+ Mg2Y -> Mg24Y5 | L: Y 0.146; Mg2Y: Y 0.333; Mg24Y5: Y 0.163 | model | [2] (ed.) 1998 | Table I, p. 242, row 3; `ORC-6GMPET4UDS` |  |
| 889 | liq. + Mg2Y -> Mg24Y5 | liq.: Y 0.1448; Mg2Y: Y 0.2659; Mg24Y5: Y 0.163 | model | [3] Guo 2007 | Table 2, p. 8, row 7; `ORC-75RDNUD7JW` |  |
| 881 | peritectic: L + Y1-xMg2 -> Y5-xMg24 | L: Y 0.141; Y1-xMg2: Y 0.264; Y5-xMg24: Y 0.16 | model | [1] Fabrichnaya 2003 | Table 3, p. 4, row 8; `ORC-ADARSIZUWL` |  |
| 847.6 | eutectic: Liquid -> hcp-A3 + Mg24Y5 | L: Y 0.082; hcp-A3: Y 0.042; Mg24Y5: Y 0.136 | model | [2] (ed.) 1998 | Table I, p. 242, row 4; `ORC-PYC2MC5W7H` |  |
| 845 | eutectic: L -> Y5-xMg24 + (Mg) | L: Y 0.082; Y5-xMg24: Y 0.135; (Mg): Y 0.035 | model | [1] Fabrichnaya 2003 | Table 3, p. 4, row 10; `ORC-4YKJPHSBVX` |  |
| 841 | eutectic: liq. -> Mg24Y5 + hcp(Mg) | liq.: Y 0.0845; Mg24Y5: Y 0.141; hcp(Mg): Y 0.0363 | model | [3] Guo 2007 | Table 2, p. 8, row 9; `ORC-BBX5RTGV7Z` |  |
| 839 | eutectic: liq. -> Mg24Y5 + hcp(Mg) | liq.: Y 0.089; Mg24Y5: Y 0.14; hcp(Mg): Y 0.038 | experimental | [3] Guo 2007; _cites Nayeb-Hashemi 1988_ | Table 2, p. 8, row 10; `ORC-B643XZGLXZ` |  |
| 839 | eutectic: L -> Y5-xMg24 + (Mg) | L: Y 0.089; Y5-xMg24: Y 0.135; (Mg): Y 0.0375 | experimental | [1] Fabrichnaya 2003; _cites Fabrichnaya_ | Table 3, p. 4, row 9; `ORC-FL5TISBU26` |  |

## 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–Y system (10)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Y5Mg24 | [Mg24Y5](https://data.orchid-project.org/compounds/Mg24Y5.html) | -7.8 kJ/mol-atom |  | model | -5.219 (mp-aaaaacym) | -5.806 (oqmd-19035) | [1] Fabrichnaya 2003 | Table 4, p. 5, row 14; `ORC-BWIEZGMPTQ.9971d6` |  |
| Y5Mg24 | [Mg24Y5](https://data.orchid-project.org/compounds/Mg24Y5.html) | -7.53 kJ/mol-atom | 298.15 | experimental | -5.219 (mp-aaaaacym) | -5.806 (oqmd-19035) | [1] Fabrichnaya 2003; _cites Smith 1965_ | Table 4, p. 5, row 12; `ORC-EX4LZX3VS4.3747c8` |  |
| Y5Mg24 | [Mg24Y5](https://data.orchid-project.org/compounds/Mg24Y5.html) | -6.1 kJ/mol-atom | 298.15 | experimental | -5.219 (mp-aaaaacym) | -5.806 (oqmd-19035) | [1] Fabrichnaya 2003; _cites Pyagai 1990_ | Table 4, p. 5, row 13; `ORC-QHJH57VUHP.eeea42` |  |
| YMg | [MgY](https://data.orchid-project.org/compounds/MgY.html) | -30.3 kJ/mol-atom | 298.15 | experimental | -10.689 (mp-aaaaaaxr) | -10.582 (oqmd-1221128) | [1] Fabrichnaya 2003; _cites Pyagai 1990_ | Table 4, p. 5, row 2; `ORC-762YX4YIBD.b779ea` |  |
| YMg | [MgY](https://data.orchid-project.org/compounds/MgY.html) | -15.6 kJ/mol-atom |  | model | -10.689 (mp-aaaaaaxr) | -10.582 (oqmd-1221128) | [1] Fabrichnaya 2003 | Table 4, p. 5, row 3; `ORC-IQTZO7QPAN.879992` |  |
| YMg | [MgY](https://data.orchid-project.org/compounds/MgY.html) | -12.6 kJ/mol-atom | 298.15 | experimental | -10.689 (mp-aaaaaaxr) | -10.582 (oqmd-1221128) | [1] Fabrichnaya 2003; _cites Smith 1965_ | Table 4, p. 5, row 1; `ORC-CYC6AI774I.f54d0e` |  |
| YMg2 | [Mg2Y](https://data.orchid-project.org/compounds/Mg2Y.html) | -17.7 kJ/mol-atom | 298.15 | experimental | -8.564 (mp-aaacppey) | -9.233 (oqmd-35188) | [1] Fabrichnaya 2003; _cites Bonhomme 1996_ [doi](https://doi.org/10.1016/0925-8388%2895%2901927-8) | Table 4, p. 5, row 8; `ORC-EVNB6AMIKZ.d885a5` |  |
| YMg2 | [Mg2Y](https://data.orchid-project.org/compounds/Mg2Y.html) | -14.2 kJ/mol-atom | 298.15 | experimental | -8.564 (mp-aaacppey) | -9.233 (oqmd-35188) | [1] Fabrichnaya 2003; _cites Smith 1965_ | Table 4, p. 5, row 6; `ORC-PLOIOQHK2J.659425` |  |
| YMg2 | [Mg2Y](https://data.orchid-project.org/compounds/Mg2Y.html) | -12.6 kJ/mol-atom |  | model | -8.564 (mp-aaacppey) | -9.233 (oqmd-35188) | [1] Fabrichnaya 2003 | Table 4, p. 5, row 9; `ORC-GJVA6VEZ7Y.51933b` |  |
| YMg2 | [Mg2Y](https://data.orchid-project.org/compounds/Mg2Y.html) | -12 kJ/mol-atom | 298.15 | experimental | -8.564 (mp-aaacppey) | -9.233 (oqmd-35188) | [1] Fabrichnaya 2003; _cites Pyagai 1990_ | Table 4, p. 5, row 7; `ORC-M3YG53Y6TM.465459` |  |

## Other properties

### Activity / EMF / Gibbs energy (6)

Table: Activity / EMF / Gibbs energy, Mg–Y system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Gibbs energy; _printed: ΔG_ | -7.95 kJ/mol-at |  | Y5Mg24; _alloy: Y 0.172414_ | experimental | [1] Fabrichnaya 2003; _cites Smith 1965_ | Table 4, p. 5, row 15; `ORC-2WRUTRLW2O.f40eae` |  |
| Gibbs energy; _printed: ΔG_ | -7.46 kJ/mol-at |  | Y5Mg24; _alloy: Y 0.172414_ | model | [1] Fabrichnaya 2003 | Table 4, p. 5, row 16; `ORC-KMGXL36EA4.fab39d` |  |
| Gibbs energy; _printed: ΔG_ | -12.14 kJ/mol-at |  | YMg; _alloy: Y 0.5_ | experimental | [1] Fabrichnaya 2003; _cites Smith 1965_ | Table 4, p. 5, row 4; `ORC-6HIXC6PWA5.f205f2` |  |
| Gibbs energy; _printed: ΔG_ | -14.47 kJ/mol-at |  | YMg; _alloy: Y 0.5_ | model | [1] Fabrichnaya 2003 | Table 4, p. 5, row 5; `ORC-LCFKVBZ2SD.5c3fad` |  |
| Gibbs energy; _printed: ΔG_ | -11.94 kJ/mol-at |  | YMg2; _alloy: Y 0.333333_ | model | [1] Fabrichnaya 2003 | Table 4, p. 5, row 11; `ORC-EVOGAAUOAQ.e002d7` |  |
| Gibbs energy; _printed: ΔG_ | -12.56 kJ/mol-at |  | YMg2; _alloy: Y 0.333333_ | experimental | [1] Fabrichnaya 2003; _cites Smith 1965_ | Table 4, p. 5, row 10; `ORC-GI7FCQSOQ6.4697ae` |  |

### Crystal structure (12)

Table: Crystal structure, Mg–Y system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 11.257 Å | 298.15 | Mg24Y5 (ε); _alloy: Y 0.172414_ | unspecified | [4] Shao 2006; _cites Tsai 2000_ [doi](https://doi.org/10.1080/01418610008212098) | Table 1, p. 2, row 1; `ORC-CLNULQGL5Y` |  |
| Lattice a | 6.037 Å | 298.15 | Mg2Y; _alloy: Y 0.333333_ | unspecified | [4] Shao 2006; _cites Tsai 2000_ [doi](https://doi.org/10.1080/01418610008212098) | Table 1, p. 2, row 2; `ORC-W2Q7CBFUTW.0631ad` |  |
| Lattice a | 3.796 Å | 298.15 | MgY; _alloy: Y 0.5_ | unspecified | [4] Shao 2006; _cites Tsai 2000_ [doi](https://doi.org/10.1080/01418610008212098) | Table 1, p. 2, row 3; `ORC-LBTYM2GOGU` |  |
| Lattice a | 3.81 Å | 298.15 | γMg-Y, MgY; _alloy: Y 0.5_ | model | [5] Shakhshir 2006; _cites Villars 1991_ | Table 4, p. 8, row 1; `ORC-2OAQRR45YC.9fbf52` |  |
| Lattice a | 3.81 Å | 298.15 | γMg-Y, MgY | model | [5] Shakhshir 2006; _cites Villars 1991_ | Table 4, p. 8, row 2; `ORC-FRF7XN6MXQ.4967c8` |  |
| Lattice c | 9.752 Å | 298.15 | Mg2Y; _alloy: Y 0.333333_ | unspecified | [4] Shao 2006; _cites Tsai 2000_ [doi](https://doi.org/10.1080/01418610008212098) | Table 1, p. 2, row 2; `ORC-W2Q7CBFUTW.b7aaf8` |  |
| lattice alpha | 90 ° | 298.15 | γMg-Y, MgY | model | [5] Shakhshir 2006; _cites Villars 1991_ | Table 4, p. 8, row 2; `ORC-FRF7XN6MXQ.f888a6` |  |
| lattice beta | 90 ° | 298.15 | γMg-Y, MgY | model | [5] Shakhshir 2006; _cites Villars 1991_ | Table 4, p. 8, row 2; `ORC-FRF7XN6MXQ.145c69` |  |
| lattice gamma | 120 ° | 298.15 | Mg2Y; _alloy: Y 0.333333_ | unspecified | [4] Shao 2006; _cites Tsai 2000_ [doi](https://doi.org/10.1080/01418610008212098) | Table 1, p. 2, row 2; `ORC-W2Q7CBFUTW.98f087` |  |
| lattice gamma | 120 ° | 298.15 | γMg-Y, MgY | model | [5] Shakhshir 2006; _cites Villars 1991_ | Table 4, p. 8, row 2; `ORC-FRF7XN6MXQ.0967f3` |  |
| lattice unspecified angle | 120 ° | 298.15 | γMg-Y, MgY; _alloy: Y 0.5_ | model | [5] Shakhshir 2006; _cites Villars 1991_ | Table 4, p. 8, row 1; `ORC-2OAQRR45YC.065832` |  |
| lattice unspecified angle | 90 ° | 298.15 | γMg-Y, MgY; _alloy: Y 0.5_ | model | [5] Shakhshir 2006; _cites Villars 1991_ | Table 4, p. 8, row 1; `ORC-2OAQRR45YC.0744c4` |  |

## Sources

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

1. O.B Fabrichnaya, H.L Lukas, G Effenberg, F Aldinger, Thermodynamic optimization in the Mg–Y system, Intermetallics 11, 1183-1188 (2003). [doi:10.1016/s0966-9795(03)00156-0](https://doi.org/10.1016/s0966-9795%2803%2900156-0)
2. 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.
3. Cuiping Guo, Zhenmin Du, Changrong Li, A thermodynamic description of the Gd–Mg–Y system, Calphad 31, 75-88 (2007). [doi:10.1016/j.calphad.2006.10.004](https://doi.org/10.1016/j.calphad.2006.10.004)
4. G. Shao, V. Varsani, Z. Fan, Thermodynamic modelling of the Y–Zn and Mg–Zn–Y systems, Calphad 30, 286-295 (2006). [doi:10.1016/j.calphad.2006.03.005](https://doi.org/10.1016/j.calphad.2006.03.005)
5. S. Al Shakhshir, M. Medraj, Computational thermodynamic model for the Mg−Al−Y system, JPED 27, 231-244 (2006). [doi:10.1361/154770306x109782](https://doi.org/10.1361/154770306x109782)

## 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/).