# Si–Zr system

> Si–Zr system: 66 accepted literature values (formation 30, invariant reaction 29, phase transition 7) and 2 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

66 accepted literature values from 3 paper(s) (experimental 13, model 53); 2 calculated phase diagram(s).

Data: [JSON](https://data.orchid-project.org/literature/systems/SI-ZR.json) · [CSV](https://data.orchid-project.org/systems/SI-ZR.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#SI-ZR) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#SI-ZR/SiZr-09Che.json) · [phases (16)](https://data.orchid-project.org/phases/pages/SI-ZR.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/SI-ZR.html) · [Markdown](https://data.orchid-project.org/systems/SI-ZR.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 13 |
| model | 53 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 29 |
| phase transition | 7 |
| formation | 30 |

## 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 |
|---|---|---|---|
| SiZr-09Che.tdb | H.M. Chen, F. Zheng, H.S. Liu, L.B. Liu, Z.P. Jin, J. Alloys Compd., 468, 209-16(2009). [doi:10.1016/j.jallcom.2008.01.061](https://doi.org/10.1016/j.jallcom.2008.01.061) | `e921a43da80c0a49589b2cb062309526f47b3ae36542ed7d8c74d090ed64f171` | [viewer](https://orchid-project.org/phase-diagrams/#SI-ZR/SiZr-09Che.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/SiZr-09Che.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/SiZr-09Che.json) |
| SiZr-94Gue-LB.tdb | C. Gueneau, C. Servant, I. Ansara, N. Dupin, Calphad, 18, 319-27(1994). [doi:10.1016/0364-5916(94)90036-1](https://doi.org/10.1016/0364-5916%2894%2990036-1) | `92268ff222aab9da3e7bb6db1562bcdea53428d397b85eabd4dc4af810b613aa` | [viewer](https://orchid-project.org/phase-diagrams/#SI-ZR/SiZr-94Gue-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/SiZr-94Gue-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/SiZr-94Gue-LB.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| SiZr-09Che.tdb | 2485.45 | SI4ZR5_BETA (x(Zr) 0.55556) + SI2ZR3_D5A (x(Zr) 0.6) + LIQUID (x(Zr) 0.63087) |
| SiZr-09Che.tdb | 2485.45 | SI4ZR5_BETA (x(Zr) 0.55556) + SI2ZR3_D5A (x(Zr) 0.6) + LIQUID (x(Zr) 0.63052) |
| SiZr-09Che.tdb | 2485.45 | SI4ZR5_BETA (x(Zr) 0.55556) + SI2ZR3_D5A (x(Zr) 0.6) + LIQUID (x(Zr) 0.63091) |
| SiZr-09Che.tdb | 2480.67 | LIQUID (x(Zr) 0.47269) + SIZR_B27 (x(Zr) 0.5) + SI4ZR5_BETA (x(Zr) 0.55556) |
| SiZr-09Che.tdb | 2480.67 | LIQUID (x(Zr) 0.47241) + SIZR_B27 (x(Zr) 0.5) + SI4ZR5_BETA (x(Zr) 0.55556) |
| SiZr-09Che.tdb | 2449.27 | SI2ZR3_D5A (x(Zr) 0.6) + SI3ZR5_D88 (x(Zr) 0.625) + LIQUID (x(Zr) 0.67807) |
| SiZr-09Che.tdb | 2449.26 | SI2ZR3_D5A (x(Zr) 0.6) + SI3ZR5_D88 (x(Zr) 0.625) + LIQUID (x(Zr) 0.67782) |
| SiZr-09Che.tdb | 2449.26 | SI2ZR3_D5A (x(Zr) 0.6) + SI3ZR5_D88 (x(Zr) 0.625) + LIQUID (x(Zr) 0.67769) |
| SiZr-09Che.tdb | 2197.41 | SI3ZR5_D88 (x(Zr) 0.625) + SIZR2_C16 (x(Zr) 0.66667) + LIQUID (x(Zr) 0.80578) |
| SiZr-09Che.tdb | 2197.41 | SI3ZR5_D88 (x(Zr) 0.625) + SIZR2_C16 (x(Zr) 0.66667) + LIQUID (x(Zr) 0.80575) |
| SiZr-09Che.tdb | 2197.41 | SI3ZR5_D88 (x(Zr) 0.625) + SIZR2_C16 (x(Zr) 0.66667) + LIQUID (x(Zr) 0.80582) |
| SiZr-09Che.tdb | 2131.3 | SI4ZR5_BETA (x(Zr) 0.55556) + SI4ZR5_ALPHA (x(Zr) 0.55556) + SI2ZR3_D5A (x(Zr) 0.6) |
| SiZr-09Che.tdb | 2131.3 | SIZR_B27 (x(Zr) 0.5) + SI4ZR5_BETA (x(Zr) 0.55556) + SI4ZR5_ALPHA (x(Zr) 0.55556) |
| SiZr-09Che.tdb | 2018.89 | SI2ZR3_D5A (x(Zr) 0.6) + SI3ZR5_D88 (x(Zr) 0.625) + SIZR2_C16 (x(Zr) 0.66667) |
| SiZr-09Che.tdb | 1924.42 | SIZR2_C16 (x(Zr) 0.66667) + SIZR3 (x(Zr) 0.75) + LIQUID (x(Zr) 0.89589) |
| SiZr-09Che.tdb | 1924.42 | SIZR2_C16 (x(Zr) 0.66667) + SIZR3 (x(Zr) 0.75) + LIQUID (x(Zr) 0.89584) |
| SiZr-09Che.tdb | 1924.42 | SIZR2_C16 (x(Zr) 0.66667) + SIZR3 (x(Zr) 0.75) + LIQUID (x(Zr) 0.89591) |
| SiZr-09Che.tdb | 1893.32 | LIQUID (x(Zr) 0.19662) + SI2ZR_C49 (x(Zr) 0.33333) + SIZR_B27 (x(Zr) 0.5) |
| SiZr-09Che.tdb | 1893.32 | LIQUID (x(Zr) 0.19661) + SI2ZR_C49 (x(Zr) 0.33333) + SIZR_B27 (x(Zr) 0.5) |
| SiZr-09Che.tdb | 1893.32 | LIQUID (x(Zr) 0.19655) + SI2ZR_C49 (x(Zr) 0.33333) + SIZR_B27 (x(Zr) 0.5) |
| SiZr-09Che.tdb | 1844 | SIZR3 (x(Zr) 0.75) + LIQUID (x(Zr) 0.92045) + BCC_A2 (x(Zr) 1) |
| SiZr-09Che.tdb | 1844 | SIZR3 (x(Zr) 0.75) + LIQUID (x(Zr) 0.92045) + BCC_A2 (x(Zr) 1) |
| SiZr-09Che.tdb | 1844 | SIZR3 (x(Zr) 0.75) + LIQUID (x(Zr) 0.9205) + BCC_A2 (x(Zr) 1) |
| SiZr-09Che.tdb | 1730.72 | SIZR_B27 (x(Zr) 0.5) + SIZR_B33 (x(Zr) 0.5) + SI4ZR5_ALPHA (x(Zr) 0.55556) |
| SiZr-09Che.tdb | 1730.72 | SI2ZR_C49 (x(Zr) 0.33333) + SIZR_B33 (x(Zr) 0.5) + SIZR_B27 (x(Zr) 0.5) |
| SiZr-09Che.tdb | 1618.69 | DIAMOND_A4 (x(Zr) 0) + LIQUID (x(Zr) 0.08207) + SI2ZR_C49 (x(Zr) 0.33333) |
| SiZr-09Che.tdb | 1618.69 | DIAMOND_A4 (x(Zr) 0) + LIQUID (x(Zr) 0.08189) + SI2ZR_C49 (x(Zr) 0.33333) |
| SiZr-09Che.tdb | 1618.69 | DIAMOND_A4 (x(Zr) 0) + LIQUID (x(Zr) 0.08189) + SI2ZR_C49 (x(Zr) 0.33333) |
| SiZr-09Che.tdb | 1139 | SIZR3 (x(Zr) 0.75) + HCP_A3 (x(Zr) 1) + BCC_A2 (x(Zr) 1) |
| SiZr-94Gue-LB.tdb | 2491.54 | SI4ZR5 (x(Zr) 0.55556) + SI2ZR3_D5A (x(Zr) 0.6) + LIQUID (x(Zr) 0.62895) |
| SiZr-94Gue-LB.tdb | 2491.54 | SI4ZR5 (x(Zr) 0.55556) + SI2ZR3_D5A (x(Zr) 0.6) + LIQUID (x(Zr) 0.62896) |
| SiZr-94Gue-LB.tdb | 2491.54 | SI4ZR5 (x(Zr) 0.55556) + SI2ZR3_D5A (x(Zr) 0.6) + LIQUID (x(Zr) 0.62854) |
| SiZr-94Gue-LB.tdb | 2476.99 | LIQUID (x(Zr) 0.46282) + SIZR (x(Zr) 0.5) + SI4ZR5 (x(Zr) 0.55556) |
| SiZr-94Gue-LB.tdb | 2476.99 | LIQUID (x(Zr) 0.46304) + SIZR (x(Zr) 0.5) + SI4ZR5 (x(Zr) 0.55556) |
| SiZr-94Gue-LB.tdb | 2455.39 | SI2ZR3_D5A (x(Zr) 0.6) + SI3ZR5_D88 (x(Zr) 0.625) + LIQUID (x(Zr) 0.67744) |
| SiZr-94Gue-LB.tdb | 2455.39 | SI2ZR3_D5A (x(Zr) 0.6) + SI3ZR5_D88 (x(Zr) 0.625) + LIQUID (x(Zr) 0.67675) |
| SiZr-94Gue-LB.tdb | 2455.38 | SI2ZR3_D5A (x(Zr) 0.6) + SI3ZR5_D88 (x(Zr) 0.625) + LIQUID (x(Zr) 0.6772) |
| SiZr-94Gue-LB.tdb | 2200.15 | SI3ZR5_D88 (x(Zr) 0.625) + SIZR2_C16 (x(Zr) 0.66667) + LIQUID (x(Zr) 0.80352) |
| SiZr-94Gue-LB.tdb | 2200.15 | SI3ZR5_D88 (x(Zr) 0.625) + SIZR2_C16 (x(Zr) 0.66667) + LIQUID (x(Zr) 0.80348) |
| SiZr-94Gue-LB.tdb | 2200.15 | SI3ZR5_D88 (x(Zr) 0.625) + SIZR2_C16 (x(Zr) 0.66667) + LIQUID (x(Zr) 0.80361) |
| SiZr-94Gue-LB.tdb | 2025.13 | SI2ZR3_D5A (x(Zr) 0.6) + SI3ZR5_D88 (x(Zr) 0.625) + SIZR2_C16 (x(Zr) 0.66667) |
| SiZr-94Gue-LB.tdb | 1927.47 | SIZR2_C16 (x(Zr) 0.66667) + SIZR3 (x(Zr) 0.75) + LIQUID (x(Zr) 0.88601) |
| SiZr-94Gue-LB.tdb | 1927.47 | SIZR2_C16 (x(Zr) 0.66667) + SIZR3 (x(Zr) 0.75) + LIQUID (x(Zr) 0.886) |
| SiZr-94Gue-LB.tdb | 1927.47 | SIZR2_C16 (x(Zr) 0.66667) + SIZR3 (x(Zr) 0.75) + LIQUID (x(Zr) 0.88603) |
| SiZr-94Gue-LB.tdb | 1900.29 | LIQUID (x(Zr) 0.17017) + SI2ZR_C49 (x(Zr) 0.33333) + SIZR (x(Zr) 0.5) |
| SiZr-94Gue-LB.tdb | 1900.28 | LIQUID (x(Zr) 0.17001) + SI2ZR_C49 (x(Zr) 0.33333) + SIZR (x(Zr) 0.5) |
| SiZr-94Gue-LB.tdb | 1900.28 | LIQUID (x(Zr) 0.16993) + SI2ZR_C49 (x(Zr) 0.33333) + SIZR (x(Zr) 0.5) |
| SiZr-94Gue-LB.tdb | 1814.24 | SIZR3 (x(Zr) 0.75) + LIQUID (x(Zr) 0.91615) + BCC_A2 (x(Zr) 1) |
| SiZr-94Gue-LB.tdb | 1814.24 | SIZR3 (x(Zr) 0.75) + LIQUID (x(Zr) 0.91618) + BCC_A2 (x(Zr) 1) |
| SiZr-94Gue-LB.tdb | 1634.58 | DIAMOND_A4 (x(Zr) 0) + LIQUID (x(Zr) 0.07339) + SI2ZR_C49 (x(Zr) 0.33333) |
| SiZr-94Gue-LB.tdb | 1634.58 | DIAMOND_A4 (x(Zr) 0) + LIQUID (x(Zr) 0.0733) + SI2ZR_C49 (x(Zr) 0.33333) |
| SiZr-94Gue-LB.tdb | 1634.58 | DIAMOND_A4 (x(Zr) 0) + LIQUID (x(Zr) 0.07322) + SI2ZR_C49 (x(Zr) 0.33333) |
| SiZr-94Gue-LB.tdb | 1139 | SIZR3 (x(Zr) 0.75) + HCP_A3 (x(Zr) 1) + BCC_A2 (x(Zr) 1) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/SI/SI-ZR.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/SI/SI-ZR.json) · [CALPHAD hull SiZr-94Gue-LB](https://data.orchid-project.org/hulls/calphad-sgte/SI/SI-ZR--SiZr-94Gue-LB.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Si–Zr system (29)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 2491.5 | peritectic: Liquid + Si4Zr5 -> Si2Zr3 | L: Zr 0.629; Si4Zr5: Zr 0.555; Si2Zr3: Zr 0.6 | model | [1] (ed.) 1998 | Table I, p. 298, row 4; `ORC-TZWG6QSIGK` |  |
| 2488.15 | peritectic: Liquid + β-Si4Zr5 -> Si2Zr3 | L: Zr 0.64; β-Si4Zr5: Zr 0.555556; Si2Zr3: Zr 0.6 | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 7; `ORC-TI4TPGE5SF` |  |
| 2485.4 | peritectic: Liquid + β-Si4Zr5 -> Si2Zr3 | L: Zr 0.631; β-Si4Zr5: Zr 0.555556; Si2Zr3: Zr 0.6 | model | [2] Chen 2009 | Table 5, p. 6, row 8; `ORC-KF4AI2IWZ3` |  |
| 2483.15 | peritectic: Liquid + β-Si4Zr5 -> β-SiZr | L: Zr 0.46; β-Si4Zr5: Zr 0.555556; β-SiZr: Zr 0.5 | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 5; `ORC-2E2PK55W3A` |  |
| 2480.3 | peritectic: Liquid + β-Si4Zr5 -> β-SiZr | L: Zr 0.472; β-Si4Zr5: Zr 0.555556; β-SiZr: Zr 0.5 | model | [2] Chen 2009 | Table 5, p. 6, row 6; `ORC-WUR4U3IIAS` |  |
| 2477 | peritectic: Liquid + Si4Zr5 -> SiZr | L: Zr 0.463; Si4Zr5: Zr 0.555; SiZr: Zr 0.5 | model | [1] (ed.) 1998 | Table I, p. 298, row 3; `ORC-RUBRSDZAK6` |  |
| 2455.4 | peritectic: Liquid + Si2Zr3 -> Si3Zr5 | L: Zr 0.677; Si2Zr3: Zr 0.6; Si3Zr5: Zr 0.675 | model | [1] (ed.) 1998 | Table I, p. 298, row 5; `ORC-2EXY4SIAUO` |  |
| 2453 | peritectic: Liquid + Si2Zr3 -> Si3Zr5 | L: Zr 0.69; Si2Zr3: Zr 0.6; Si3Zr5: Zr 0.625 | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 9; `ORC-3QZ7O3S6FT` |  |
| 2449.3 | peritectic: Liquid + Si2Zr3 -> Si3Zr5 | L: Zr 0.678; Si2Zr3: Zr 0.6; Si3Zr5: Zr 0.625 | model | [2] Chen 2009 | Table 5, p. 6, row 10; `ORC-4DNCKZYZXG` |  |
| 2200 | peritectic: Liquid + Si3Zr5 -> SiZr2 | L: Zr 0.803; Si3Zr5: Zr 0.625; SiZr2: Zr 0.666 | model | [1] (ed.) 1998 | Table I, p. 298, row 6; `ORC-DLDZ7VUQVF` |  |
| 2198.15 | peritectic: Liquid + Si3Zr5 -> SiZr2 | L: Zr 0.82; Si3Zr5: Zr 0.625; SiZr2: Zr 0.666667 | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 11; `ORC-NOCYMR3JME` |  |
| 2196.98 | peritectic: Liquid + Si3Zr5 -> SiZr2 | L: Zr 0.806; Si3Zr5: Zr 0.625; SiZr2: Zr 0.666667 | model | [2] Chen 2009 | Table 5, p. 6, row 12; `ORC-7TJTVOEA4C` |  |
| 2025.2 | eutectoid: Si3Zr5 -> Si2Zr3 + SiZr2 | Si3Zr5: Zr 0.625; Si2Zr3: Zr 0.6; SiZr2: Zr 0.666 | model | [1] (ed.) 1998 | Table I, p. 298, row 10; `ORC-XGYTQCST5D` |  |
| 2018.3 | eutectoid: Si3Zr5 -> Si2Zr3+SiZr2 | Si3Zr5: Zr 0.625; Si2Zr3: Zr 0.6; SiZr2: Zr 0.666667 | model | [2] Chen 2009 | Table 5, p. 6, row 20; `ORC-4AUJHGGJJI` |  |
| 2018.15 | eutectoid: Si3Zr5 -> Si2Zr3+SiZr2 | Si3Zr5: Zr 0.625; Si2Zr3: Zr 0.6; SiZr2: Zr 0.666667 | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 19; `ORC-EON3Z6HEJJ` |  |
| 1927.4 | peritectic: Liquid + SiZr2 -> SiZr3 | L: Zr 0.886; SiZr2: Zr 0.666; SiZr3: Zr 0.75 | model | [1] (ed.) 1998 | Table I, p. 298, row 7; `ORC-VNE75R7J2P` |  |
| 1924.5 | peritectic: Liquid + SiZr2 -> SiZr3 | L: Zr 0.896; SiZr2: Zr 0.666667; SiZr3: Zr 0.75 | model | [2] Chen 2009 | Table 5, p. 6, row 14; `ORC-KS24ZB5OQA` |  |
| 1923.15 | peritectic: Liquid + SiZr2 -> SiZr3 | L: Zr 0.87; SiZr2: Zr 0.666667; SiZr3: Zr 0.75 | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 13; `ORC-EVFSAFEUP5` |  |
| 1900.3 | peritectic: Liquid + SiZr -> Si2Zr | L: Zr 0.17; SiZr: Zr 0.5; Si2Zr: Zr 0.333 | model | [1] (ed.) 1998 | Table I, p. 298, row 2; `ORC-IZMPAIAFHR` |  |
| 1893.3 | peritectic: Liquid + β-SiZr -> Si2Zr | L: Zr 0.197; β-SiZr: Zr 0.5; Si2Zr: Zr 0.333333 | model | [2] Chen 2009 | Table 5, p. 6, row 4; `ORC-LPZZAPV25C` |  |
| 1893.15 | peritectic: Liquid + β-SiZr -> Si2Zr | L: Zr 0.25; β-SiZr: Zr 0.5; Si2Zr: Zr 0.333333 | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 3; `ORC-OOVGRHGIGL` |  |
| 1843.96 | eutectic: Liquid -> bcc-Zr+SiZr3 | L: Zr 0.92; SiZr3: Zr 0.75 | model | [2] Chen 2009 | Table 5, p. 6, row 16; `ORC-B3SUMFNX5P` |  |
| 1843.15 | eutectic: Liquid -> bcc-Zr+SiZr3 | L: Zr 0.91; SiZr3: Zr 0.75 | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 15; `ORC-LE6LSQTZSC` |  |
| 1814.2 | eutectic: Liquid -> SiZr3 + bcc-A2 | L: Zr 0.916; SiZr3: Zr 0.75; bcc-A2: Zr 1 | model | [1] (ed.) 1998 | Table I, p. 298, row 8; `ORC-EJLCLAZXMK` |  |
| 1634.6 | eutectic: Liquid -> diamond + Si2Zr | L: Zr 0.073; diamond: Zr 0; Si2Zr: Zr 0.333 | model | [1] (ed.) 1998 | Table I, p. 298, row 1; `ORC-27IPJVLW2N` |  |
| 1628.15 | eutectic: Liquid -> Si+Si2Zr | L: Zr 0.1; Si: Zr 0; Si2Zr: Zr 0.333333 | experimental | [2] Chen 2009; _cites Okamoto 1990_ [doi](https://doi.org/10.1007/bf02898272) | Table 5, p. 6, row 1; `ORC-NQ65XVBE26` |  |
| 1618.7 | eutectic: Liquid -> Si+Si2Zr | L: Zr 0.0819; Si: Zr 0; Si2Zr: Zr 0.333333 | model | [2] Chen 2009 | Table 5, p. 6, row 2; `ORC-L3ZCBJXTX5` |  |
| 1139 | other: Bcc-Zr -> hcp-Zr+SiZr3 | SiZr3: Zr 0.75 | model | [2] Chen 2009 | Table 5, p. 6, row 18; `ORC-7NXAUUVMWF` |  |
| 1138.15 | other: Bcc-Zr -> hcp-Zr+SiZr3 | SiZr3: Zr 0.75 | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 17; `ORC-ENFJMKVUXM` |  |

## 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, Si–Zr system (30)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Si2Zr | [Si2Zr](https://data.orchid-project.org/compounds/Si2Zr.html) | -56.2933 kJ/mol-atom | 298.15 | model | -57.935 (mp-aaaaacgh) | -63.036 (oqmd-3570) | [3] Gueneau 1994 | Table II, p. 4, row 5; `ORC-4SZCPQN4JC` |  |
| Si2Zr | [Si2Zr](https://data.orchid-project.org/compounds/Si2Zr.html) | -53.086 kJ/mol-atom ± 12.54 | 298.15 | model | -57.935 (mp-aaaaacgh) | -63.036 (oqmd-3570) | [3] Gueneau 1994; _cites ref. 73Hul_ | Table II, p. 4, row 3; `ORC-Q6H6ZGY4Z7` |  |
| Si2Zr | [Si2Zr](https://data.orchid-project.org/compounds/Si2Zr.html) | -51.308 kJ/mol-atom ± 0.973333 | 298.15 | model | -57.935 (mp-aaaaacgh) | -63.036 (oqmd-3570) | [3] Gueneau 1994; _cites ref. 78Mas_ | Table II, p. 4, row 4; `ORC-KBZYVZIGJ5` |  |
| Si2Zr | [Si2Zr](https://data.orchid-project.org/compounds/Si2Zr.html) | -50.2993 kJ/mol-atom | 298.15 | model | -57.935 (mp-aaaaacgh) | -63.036 (oqmd-3570) | [3] Gueneau 1994; _cites ref. 73Bol_ | Table II, p. 4, row 2; `ORC-DYBQKKPZFN` |  |
| Si2Zr | [Si2Zr](https://data.orchid-project.org/compounds/Si2Zr.html) | -49.8813 kJ/mol-atom | 298.15 | model | -57.935 (mp-aaaaacgh) | -63.036 (oqmd-3570) | [3] Gueneau 1994; _cites ref. 55Rob_ | Table II, p. 4, row 1; `ORC-EMLXCFAGAA` |  |
| Si2Zr3 | [Si2Zr3](https://data.orchid-project.org/compounds/Si2Zr3.html) | -88.812 kJ/mol-atom | 298.15 | model | -82.475 (mp-aaacqroa) | -85.385 (oqmd-1364772) | [3] Gueneau 1994 | Table II, p. 4, row 14; `ORC-RBKTVS44MN` |  |
| Si2Zr3 | [Si2Zr3](https://data.orchid-project.org/compounds/Si2Zr3.html) | -76.912 kJ/mol-atom | 298.15 | model | -82.475 (mp-aaacqroa) | -85.385 (oqmd-1364772) | [3] Gueneau 1994; _cites ref. 73Hul_ | Table II, p. 4, row 13; `ORC-LHD7U5ENN2` |  |
| Si3Zr5 | [Si3Zr5](https://data.orchid-project.org/compounds/Si3Zr5.html) | -112.968 kJ/mol-atom ± 4.1875 | 298.15 | model | -76.551 (mp-aaabgikp) | -79.039 (oqmd-31218) | [3] Gueneau 1994; _cites ref. 65Gol_ | Table II, p. 4, row 16; `ORC-VY4D5YQWWN` |  |
| Si3Zr5 | [Si3Zr5](https://data.orchid-project.org/compounds/Si3Zr5.html) | -78.175 kJ/mol-atom | 298.15 | model | -76.551 (mp-aaabgikp) | -79.039 (oqmd-31218) | [3] Gueneau 1994 | Table II, p. 4, row 19; `ORC-LOBM2PW4U7` |  |
| Si3Zr5 | [Si3Zr5](https://data.orchid-project.org/compounds/Si3Zr5.html) | -76.494 kJ/mol-atom | 298.15 | model | -76.551 (mp-aaabgikp) | -79.039 (oqmd-31218) | [3] Gueneau 1994; _cites ref. 55Rob_ | Table II, p. 4, row 15; `ORC-SFBYMDVRPG` |  |
| Si3Zr5 | [Si3Zr5](https://data.orchid-project.org/compounds/Si3Zr5.html) | -71.896 kJ/mol-atom ± 12.54 | 298.15 | model | -76.551 (mp-aaabgikp) | -79.039 (oqmd-31218) | [3] Gueneau 1994; _cites ref. 73Hul_ | Table II, p. 4, row 17; `ORC-CC2RN3DMWO` |  |
| Si3Zr5 | [Si3Zr5](https://data.orchid-project.org/compounds/Si3Zr5.html) | -71.65 kJ/mol-atom ± 4.79 | 298.15 | model | -76.551 (mp-aaabgikp) | -79.039 (oqmd-31218) | [3] Gueneau 1994; _cites ref. 90Top_ | Table II, p. 4, row 18; `ORC-JIWNSTG2A6` |  |
| Si4Zr5 | [Si4Zr5](https://data.orchid-project.org/compounds/Si4Zr5.html) | -88.3 kJ/mol-atom | 298.15 | model | -84.244 (mp-aaaaabye) | -87.268 (oqmd-3883) | [3] Gueneau 1994 | Table II, p. 4, row 12; `ORC-LLA2RPJKR6` |  |
| Si5Zr6 |  | -96.2273 kJ/mol-atom ± 3.88182 | 298.15 | model |  |  | [3] Gueneau 1994; _cites ref. 65Gol_ | Table II, p. 4, row 26; `ORC-JODQ4D356L.5e0493` |  |
| Si5Zr6 |  | -77.748 kJ/mol-atom | 298.15 | model |  |  | [3] Gueneau 1994; _cites ref. 73Hul_ | Table II, p. 4, row 27; `ORC-ITIO6JJ2G2.9deb27` |  |
| Si5Zr6 |  | -77.33 kJ/mol-atom | 298.15 | model |  |  | [3] Gueneau 1994; _cites ref. 55Rob_ | Table II, p. 4, row 25; `ORC-3H3AANOBO6.ba94fb` |  |
| Si5Zr6# |  | -1058.5 kJ/mol (basis unstated) ± 42.7 | 298.15 | model |  |  | [3] Gueneau 1994; _cites ref. 65Gol_ | Table II, p. 4, row 26; `ORC-JODQ4D356L.a0ab5f` |  |
| Si5Zr6# |  | -855.228 kJ/mol (basis unstated) | 298.15 | model |  |  | [3] Gueneau 1994; _cites ref. 73Hul_ | Table II, p. 4, row 27; `ORC-ITIO6JJ2G2.97c1df` |  |
| Si5Zr6# |  | -850.63 kJ/mol (basis unstated) | 298.15 | model |  |  | [3] Gueneau 1994; _cites ref. 55Rob_ | Table II, p. 4, row 25; `ORC-3H3AANOBO6.73be0a` |  |
| SiZr | [SiZr](https://data.orchid-project.org/compounds/SiZr.html) | -129.7 kJ/mol-atom ± 4.2 | 298.15 | model | -86.746 (mp-aaaaaqtm) | -90.225 (oqmd-31074) | [3] Gueneau 1994; _cites ref. 65Gol_ | Table II, p. 4, row 7; `ORC-FNYEBTT7ZX` |  |
| SiZr | [SiZr](https://data.orchid-project.org/compounds/SiZr.html) | -83.67 kJ/mol-atom | 298.15 | model | -86.746 (mp-aaaaaqtm) | -90.225 (oqmd-31074) | [3] Gueneau 1994 | Table II, p. 4, row 11; `ORC-65NX6YTYQD` |  |
| SiZr | [SiZr](https://data.orchid-project.org/compounds/SiZr.html) | -77.33 kJ/mol-atom ± 12.54 | 298.15 | model | -86.746 (mp-aaaaaqtm) | -90.225 (oqmd-31074) | [3] Gueneau 1994; _cites ref. 73Hul_ | Table II, p. 4, row 9; `ORC-2FHZST6JU7` |  |
| SiZr | [SiZr](https://data.orchid-project.org/compounds/SiZr.html) | -74.822 kJ/mol-atom ± 1.46 | 298.15 | model | -86.746 (mp-aaaaaqtm) | -90.225 (oqmd-31074) | [3] Gueneau 1994; _cites ref. 78Mas_ | Table II, p. 4, row 10; `ORC-TQ6V7GKOYA` |  |
| SiZr | [SiZr](https://data.orchid-project.org/compounds/SiZr.html) | -73.777 kJ/mol-atom | 298.15 | model | -86.746 (mp-aaaaaqtm) | -90.225 (oqmd-31074) | [3] Gueneau 1994; _cites ref. 73Bol_ | Table II, p. 4, row 8; `ORC-HUI5ME6OVB` |  |
| SiZr | [SiZr](https://data.orchid-project.org/compounds/SiZr.html) | -73.772 kJ/mol-atom | 298.15 | model | -86.746 (mp-aaaaaqtm) | -90.225 (oqmd-31074) | [3] Gueneau 1994; _cites ref. 55Rob_ | Table II, p. 4, row 6; `ORC-X653RKZLTP` |  |
| SiZr2 | [SiZr2](https://data.orchid-project.org/compounds/SiZr2.html) | -112.967 kJ/mol-atom ± 4.18333 | 298.15 | model | -72.863 (mp-aaaaabxe) | -75.334 (oqmd-7792) | [3] Gueneau 1994; _cites ref. 65Gol_ | Table II, p. 4, row 20; `ORC-RGD6JUBTWH` |  |
| SiZr2 | [SiZr2](https://data.orchid-project.org/compounds/SiZr2.html) | -77.06 kJ/mol-atom | 298.15 | model | -72.863 (mp-aaaaabxe) | -75.334 (oqmd-7792) | [3] Gueneau 1994 | Table II, p. 4, row 22; `ORC-WJK3FRN4WI` |  |
| SiZr2 | [SiZr2](https://data.orchid-project.org/compounds/SiZr2.html) | -69.388 kJ/mol-atom | 298.15 | model | -72.863 (mp-aaaaabxe) | -75.334 (oqmd-7792) | [3] Gueneau 1994; _cites ref. 73Hul_ | Table II, p. 4, row 21; `ORC-P3L4EKB3JU` |  |
| SiZr3 | [SiZr3](https://data.orchid-project.org/compounds/SiZr3.html) | -60.82 kJ/mol-atom | 298.15 | model | -52.992 (mp-aaacqimy) | -54.922 (oqmd-2053245) | [3] Gueneau 1994 | Table II, p. 4, row 24; `ORC-2WHZGSAEBD` |  |
| SiZr3 | [SiZr3](https://data.orchid-project.org/compounds/SiZr3.html) | -54.34 kJ/mol-atom | 298.15 | model | -52.992 (mp-aaacqimy) | -54.922 (oqmd-2053245) | [3] Gueneau 1994; _cites ref. 73Hul_ | Table II, p. 4, row 23; `ORC-GAXVKC4VIH` |  |

## Other properties

### Phase transition (7)

Table: Phase transition, Si–Zr system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1732.5 K | 1732.5 | polymorphic: α-SiZr -> β-SiZr; _α-SiZr: Zr 0.5; β-SiZr: Zr 0.5_ | model | [2] Chen 2009 | Table 5, p. 6, row 24; `ORC-2RUQQSLSUC` |  |
| Phase transition | 1733.15 K | 1733.15 | polymorphic: α-SiZr -> β-SiZr; _α-SiZr: Zr 0.5; β-SiZr: Zr 0.5_ | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 23; `ORC-BOQGSZAVWJ` |  |
| Phase transition | 2132.5 K | 2132.5 | polymorphic: α-Si4Zr5 -> β-Si4Zr5; _α-Si4Zr5: Zr 0.555556; β-Si4Zr5: Zr 0.555556_ | model | [2] Chen 2009 | Table 5, p. 6, row 26; `ORC-Q27FTVZY2X` |  |
| Phase transition | 2133.15 K | 2133.15 | polymorphic: α-Si4Zr5 -> β-Si4Zr5; _α-Si4Zr5: Zr 0.555556; β-Si4Zr5: Zr 0.555556_ | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 25; `ORC-UYHT7IFMD3` |  |
| Phase transition | 2523 K | 2523 | congruent melting: Liquid -> β-Si4Zr5; _L: Zr 0.556; β-Si4Zr5: Zr 0.555556_ | experimental | [2] Chen 2009; _cites Alcock 1976_ | Table 5, p. 6, row 21; `ORC-TOCWQIAGKM` |  |
| Phase transition | 2525 K | 2525 | congruent melting: Liquid -> β-Si4Zr5; _L: Zr 0.556; β-Si4Zr5: Zr 0.555556_ | model | [2] Chen 2009 | Table 5, p. 6, row 22; `ORC-LTPFBTNDMU` |  |
| Phase transition | 2527 K | 2527 | congruent melting: Liquid -> Si4Zr5; _L: Zr 0.556; Si4Zr5: Zr 0.556_ | model | [1] (ed.) 1998 | Table I, p. 298, row 11; `ORC-57BGVT6TTU` |  |

## Sources

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

1. 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.
2. H.M. Chen, F. Zheng, H.S. Liu, L.B. Liu, Z.P. Jin, Thermodynamic assessment of B–Zr and Si–Zr binary systems, Journal of Alloys and Compounds 468, 209-216 (2009). [doi:10.1016/j.jallcom.2008.01.061](https://doi.org/10.1016/j.jallcom.2008.01.061)
3. C. Gueneau, C. Servant, I. Ansara, N. Dupin, Thermodynamic assessment of the SiZr system, Calphad 18, 319-327 (1994). [doi:10.1016/0364-5916(94)90036-1](https://doi.org/10.1016/0364-5916%2894%2990036-1)

## 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/).