# Si–W system

> Si–W system: 78 accepted literature values (invariant reaction 39, phase transition 24, formation 11, crystal structure 4) and 4 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

78 accepted literature values from 3 paper(s) (experimental 58, model 20); 4 calculated phase diagram(s). 3 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/SI-W.json) · [CSV](https://data.orchid-project.org/systems/SI-W.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#SI-W) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#SI-W/SiW-03Che-LB.json) · [phases (7)](https://data.orchid-project.org/phases/pages/SI-W.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/SI-W.html) · [Markdown](https://data.orchid-project.org/systems/SI-W.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 58 |
| model | 20 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 39 |
| phase transition | 24 |
| formation | 11 |
| crystal structure | 4 |

## 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 |
|---|---|---|---|
| SiW-03Che-LB.tdb | P.-Y. Chevalier, E. Fischer, unpublished, 2003. | `980d470108b9356014b6a28aedaff9d818a3785bf4b9d86044bce6c3fb688023` | [viewer](https://orchid-project.org/phase-diagrams/#SI-W/SiW-03Che-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/SiW-03Che-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/SiW-03Che-LB.json) |
| SiW-09Guo.tdb | Z. Guo, W. Yuan, Y. Sun, Z. Cai, Z. Qiao, J. Phase Equilib. Diffus., 30, 564-70(2009). [doi:10.1007/s11669-009-9579-x](https://doi.org/10.1007/s11669-009-9579-x) | `5f6d911f9b50695896885bab52759251967d3aeb5536938d44554d602e33a85f` | [viewer](https://orchid-project.org/phase-diagrams/#SI-W/SiW-09Guo.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/SiW-09Guo.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/SiW-09Guo.json) |
| SiW-13Li.tdb | Y. Li, C. Li, Z. Du, C. Guo, Calphad, 43, 112-23(2013). [doi:10.1016/j.calphad.2013.04.004](https://doi.org/10.1016/j.calphad.2013.04.004) | `6cb14cc0019fd85687d871a41d2eadee3ed10a9f84d075558c911dca731f1d55` | [viewer](https://orchid-project.org/phase-diagrams/#SI-W/SiW-13Li.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/SiW-13Li.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/SiW-13Li.json) |
| SiW-89Vah.tdb | C. Vahlas, P.-Y. Chevalier, E. Blanquet, Calphad, 13, 273-92(1989). [doi:10.1016/0364-5916(89)90007-2](https://doi.org/10.1016/0364-5916%2889%2990007-2) | `1b97c566f7b1735ce36c841c697dde9e201aeb64f8c5c00322f49c792b83ab23` | [viewer](https://orchid-project.org/phase-diagrams/#SI-W/SiW-89Vah.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/SiW-89Vah.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/SiW-89Vah.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| SiW-03Che-LB.tdb | 2535.87 | SI3W5_D8M (x(W) 0.625) + LIQUID (x(W) 0.65046) + BCC_A2 (x(W) 0.93612) |
| SiW-03Che-LB.tdb | 2535.87 | SI3W5_D8M (x(W) 0.625) + LIQUID (x(W) 0.65049) + BCC_A2 (x(W) 0.93613) |
| SiW-03Che-LB.tdb | 2301.46 | SI2W_C11B (x(W) 0.33333) + LIQUID (x(W) 0.4442) + SI3W5_D8M (x(W) 0.625) |
| SiW-03Che-LB.tdb | 2301.46 | SI2W_C11B (x(W) 0.33333) + LIQUID (x(W) 0.44445) + SI3W5_D8M (x(W) 0.625) |
| SiW-03Che-LB.tdb | 1671.14 | DIAMOND_A4 (x(W) 0) + LIQUID (x(W) 0.02879) + SI2W_C11B (x(W) 0.33333) |
| SiW-03Che-LB.tdb | 1671.13 | DIAMOND_A4 (x(W) 0) + LIQUID (x(W) 0.02842) + SI2W_C11B (x(W) 0.33333) |
| SiW-09Guo.tdb | 2484.59 | SI3W5_D8M (x(W) 0.625) + LIQUID (x(W) 0.71224) + BCC_A2 (x(W) 0.94521) |
| SiW-09Guo.tdb | 2484.59 | SI3W5_D8M (x(W) 0.625) + LIQUID (x(W) 0.71226) + BCC_A2 (x(W) 0.94522) |
| SiW-09Guo.tdb | 2284.02 | SI2W_C11B (x(W) 0.33333) + LIQUID (x(W) 0.46847) + SI3W5_D8M (x(W) 0.625) |
| SiW-09Guo.tdb | 2284.02 | SI2W_C11B (x(W) 0.33333) + LIQUID (x(W) 0.46856) + SI3W5_D8M (x(W) 0.625) |
| SiW-09Guo.tdb | 1660.94 | DIAMOND_A4 (x(W) 0) + LIQUID (x(W) 0.04416) + SI2W_C11B (x(W) 0.33333) |
| SiW-09Guo.tdb | 1660.93 | DIAMOND_A4 (x(W) 0) + LIQUID (x(W) 0.0438) + SI2W_C11B (x(W) 0.33333) |
| SiW-13Li.tdb | 2352.03 | SI3W5_D8M (x(W) 0.6217) + LIQUID (x(W) 0.66752) + BCC_A2 (x(W) 0.96066) |
| SiW-13Li.tdb | 2230.71 | SI2W_C11B (x(W) 0.33333) + LIQUID (x(W) 0.46164) + SI3W5_D8M (x(W) 0.59955) |
| SiW-13Li.tdb | 1666.92 | DIAMOND_A4 (x(W) 0) + LIQUID (x(W) 0.03509) + SI2W_C11B (x(W) 0.33333) |
| SiW-13Li.tdb | 1666.92 | DIAMOND_A4 (x(W) 0) + LIQUID (x(W) 0.03487) + SI2W_C11B (x(W) 0.33333) |
| SiW-89Vah.tdb | 2353.53 | SI3W5_D8M (x(W) 0.625) + LIQUID (x(W) 0.6687) + BCC_A2 (x(W) 0.96946) |
| SiW-89Vah.tdb | 2353.53 | SI3W5_D8M (x(W) 0.625) + LIQUID (x(W) 0.66872) + BCC_A2 (x(W) 0.96946) |
| SiW-89Vah.tdb | 2213.37 | SI2W_C11B (x(W) 0.33333) + LIQUID (x(W) 0.47439) + SI3W5_D8M (x(W) 0.625) |
| SiW-89Vah.tdb | 2213.37 | SI2W_C11B (x(W) 0.33333) + LIQUID (x(W) 0.47441) + SI3W5_D8M (x(W) 0.625) |
| SiW-89Vah.tdb | 1662.09 | DIAMOND_A4 (x(W) 0) + LIQUID (x(W) 0.04134) + SI2W_C11B (x(W) 0.33333) |
| SiW-89Vah.tdb | 1662.09 | DIAMOND_A4 (x(W) 0) + LIQUID (x(W) 0.04132) + SI2W_C11B (x(W) 0.33333) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/SI/SI-W.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/SI/SI-W.json) · [CALPHAD hull SiW-03Che-LB](https://data.orchid-project.org/hulls/calphad-sgte/SI/SI-W--SiW-03Che-LB.json) · [CALPHAD hull SiW-09Guo](https://data.orchid-project.org/hulls/calphad-sgte/SI/SI-W--SiW-09Guo.json) · [CALPHAD hull SiW-89Vah](https://data.orchid-project.org/hulls/calphad-sgte/SI/SI-W--SiW-89Vah.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Si–W system (39)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 2643 | (L)+bcc->Si3W5 | L: W 0.58; bcc: W 0.92; Si3W5: W 0.625 | experimental | [1] Vahlas 1989; _cites ref. 58_ | Table 8, p. 15, row 28; `ORC-WTUIK2ISZF` |  |
| 2594 | congruent melting: L \<-> W5Si3 | W5Si3: Si 0.375 | model | [2] Guo 2009 | Table 5, p. 5, row 4; `ORC-LKS25V4SYK` |  |
| 2593 | congruent melting: L \<-> W5Si3 | W5Si3: Si 0.375 | experimental | [2] Guo 2009; _cites Maksimov 1969_ | Table 5, p. 5, row 5; `ORC-5VBEUTRS6I` |  |
| 2523 | eutectic: (L)->Si3W5+bcc | L: W 0.8; Si3W5: W 0.625; bcc: W 0.95 | experimental | [1] Vahlas 1989; _cites ref. 18_ | Table 8, p. 15, row 30; `ORC-T7UIWBEU5L` |  |
| 2483 | eutectic: (L)->Si3W5+bcc | L: W 0.79; Si3W5: W 0.625; bcc: W 0.94 | experimental | [1] Vahlas 1989; _cites ref. 48_ | Table 8, p. 15, row 31; `ORC-5CYIDM2H76` |  |
| 2460 | L \<-> (W) + W5Si3 | L: Si 0.281; (W): Si 0.055; W5Si3: Si 0.375 | model | [2] Guo 2009 | Table 5, p. 5, row 1; `ORC-WUONSA3UZT` |  |
| 2453 | eutectic: L->Bcc+W5Si3 | W5Si3: W 0.625 | experimental | [3] Li 2013; _cites Maksimov 1969_ | Table 2, p. 3, row 3; `ORC-PHMG5PGDGH` |  |
| 2453 | eutectic: (L)->Si3W5+bcc | L: W 0.68; Si3W5: W 0.625; bcc: W 0.95 | experimental | [1] Vahlas 1989; _cites ref. 49_ | Table 8, p. 15, row 32; `ORC-QHRVKWDRJH` |  |
| 2453 | L \<-> (W) + W5Si3 | L: Si 0.315; (W): Si 0.055; W5Si3: Si 0.375 | experimental | [2] Guo 2009; _cites Maksimov 1969_ | Table 5, p. 5, row 2; `ORC-VEFHUPGMAO` |  |
| 2433 | congruent melting: L \<-> WSi2 | WSi2: Si 0.667 | model | [2] Guo 2009 | Table 5, p. 5, row 10; `ORC-5N37P76XUH` |  |
| 2433 | congruent melting: L \<-> WSi2 | WSi2: Si 0.667 | experimental | [2] Guo 2009; _cites Maksimov 1969_ | Table 5, p. 5, row 11; `ORC-FK5GOJ75CQ` |  |
| 2368 | congruent melting: L \<-> W5Si3 | W5Si3: Si 0.375 | experimental | [2] Guo 2009; _cites Yu 1973_ | Table 5, p. 5, row 6; `ORC-XTWQQBJTCE` |  |
| 2362 | eutectic: (L)->Si3W5+bcc | L: W 0.671; Si3W5: W 0.625; bcc: W 0.97 | model | [1] Vahlas 1989 | Table 8, p. 15, row 29; `ORC-XLUIXYA7PN` |  |
| 2358 | eutectic: (L)->Si3W5+bcc | L: W 0.68; Si3W5: W 0.625; bcc: W 0.96 | experimental | [1] Vahlas 1989; _cites ref. 51_ | Table 8, p. 15, row 33; `ORC-EDVY4FU2WX` |  |
| 2358 | eutectic: L->Bcc+W5Si3 | W5Si3: W 0.625 | experimental | [3] Li 2013; _cites Kocherzhinskii 1973_ | Table 2, p. 3, row 8; `ORC-FWCCH36WMR` |  |
| 2358 | L \<-> (W) + W5Si3 | L: Si 0.32; (W): Si 0.05; W5Si3: Si 0.375 | experimental | [2] Guo 2009; _cites Yu 1973_ | Table 5, p. 5, row 3; `ORC-KUV64MFJS6` |  |
| 2343 | eutectic: (L)->Si2W+Si3W5 | L: W 0.43; Si2W: W 0.333333; Si3W5: W 0.625 | experimental | [1] Vahlas 1989; _cites ref. 47_ | Table 8, p. 15, row 18; `ORC-FCWLWND2FM` |  |
| 2333 | eutectic: (L)->Si2W+Si3W5 | L: W 0.41; Si2W: W 0.333333; Si3W5: W 0.625 | experimental | [1] Vahlas 1989; _cites ref. 18_ | Table 8, p. 15, row 19; `ORC-57536FDB6E` |  |
| 2293 | congruent melting: L \<-> WSi2 | WSi2: Si 0.667 | experimental | [2] Guo 2009; _cites Yu 1973_ | Table 5, p. 5, row 12; `ORC-LFZIXYNS5W` |  |
| 2284 | L \<-> W5Si3 + WSi2 | L: Si 0.532; W5Si3: Si 0.375; WSi2: Si 0.667 | model | [2] Guo 2009 | Table 5, p. 5, row 7; `ORC-RJXGXRQ7JT` |  |
| 2283 | L \<-> W5Si3 + WSi2 | L: Si 0.593; W5Si3: Si 0.4; WSi2: Si 0.667 | experimental | [2] Guo 2009; _cites Maksimov 1969_ | Table 5, p. 5, row 8; `ORC-FEOYO4AC3M` |  |
| 2283 | eutectic: (L)->Si2W+Si3W5 | L: W 0.405; Si2W: W 0.333333; Si3W5: W 0.625 | experimental | [1] Vahlas 1989; _cites ref. 53_ | Table 8, p. 15, row 22; `ORC-HIFFCAG5IB` |  |
| 2283 | eutectic: (L)->Si2W+Si3W5 | L: W 0.405; Si2W: W 0.333333; Si3W5: W 0.625 | experimental | [1] Vahlas 1989; _cites ref. 48_ | Table 8, p. 15, row 20; `ORC-MS42VHMAUR` |  |
| 2283 | eutectic: L->W5Si3+WSi2 | W5Si3: W 0.625; WSi2: W 0.333333 | experimental | [3] Li 2013; _cites Maksimov 1969_ | Table 2, p. 3, row 4; `ORC-Z5EJSNGCVD` |  |
| 2213 | eutectic: L->W5Si3+WSi2 | W5Si3: W 0.625; WSi2: W 0.333333 | experimental | [3] Li 2013; _cites Kocherzhinskii 1973_ | Table 2, p. 3, row 9; `ORC-3KFXDRGPKM` |  |
| 2213 | eutectic: (L)->Si2W+Si3W5 | L: W 0.475; Si2W: W 0.333333; Si3W5: W 0.625 | model | [1] Vahlas 1989 | Table 8, p. 15, row 17; `ORC-N5LDRLYGZM` |  |
| 2213 | L \<-> W5Si3 + WSi2 | L: Si 0.53; W5Si3: Si 0.375; WSi2: Si 0.667 | experimental | [2] Guo 2009; _cites Yu 1973_ | Table 5, p. 5, row 9; `ORC-YPO63WEOLK` |  |
| 2213 | eutectic: (L)->Si2W+Si3W5 | L: W 0.47; Si2W: W 0.333333; Si3W5: W 0.625 | experimental | [1] Vahlas 1989; _cites ref. 51_ | Table 8, p. 15, row 21; `ORC-ZUAZEXO4A2` |  |
| 1673 | eutectic: (L)->Si(dia)+Si2W | L: W 0.008; Si(dia): W 0; Si2W: W 0.333333 | experimental | [1] Vahlas 1989; _cites ref. 18_ | Table 8, p. 15, row 7; `ORC-N7IUUDCNMC` |  |
| 1673 | eutectic: (L)->Si(dia)+Si2W | L: W 0.026; Si(dia): W 0; Si2W: W 0.333333 | experimental | [1] Vahlas 1989; _cites ref. 51_ | Table 8, p. 15, row 9; `ORC-VBBL5VH35Z` |  |
| 1673 | L \<-> Si + WSi2 | L: Si 0.974; Si: Si 1; WSi2: Si 0.667 | experimental | [2] Guo 2009; _cites Yu 1973_ | Table 5, p. 5, row 15; `ORC-YHCUJRPXPC` |  |
| 1673 | eutectic: L->WSi2+Si | WSi2: W 0.333333; Si: W 0 | experimental | [3] Li 2013; _cites Kocherzhinskii 1973_ | Table 2, p. 3, row 10; `ORC-YQPBNHLDXC` |  |
| 1666 | L \<-> Si + WSi2 | L: Si 0.956; Si: Si 1; WSi2: Si 0.667 | model | [2] Guo 2009 | Table 5, p. 5, row 13; `ORC-L2CCTBJNPH` |  |
| 1663 | L \<-> Si + WSi2 | L: Si 0.992; Si: Si 1; WSi2: Si 0.667 | experimental | [2] Guo 2009; _cites Maksimov 1969_ | Table 5, p. 5, row 14; `ORC-BIW7AQZSBH` |  |
| 1663 | eutectic: (L)->Si(dia)+Si2W | L: W 0.017; Si(dia): W 0; Si2W: W 0.333333 | experimental | [1] Vahlas 1989; _cites ref. 49_ | Table 8, p. 15, row 8; `ORC-MLQLLFQ4WM` |  |
| 1663 | eutectic: L->WSi2+Si | WSi2: W 0.333333; Si: W 0 | experimental | [3] Li 2013; _cites Maksimov 1969_ | Table 2, p. 3, row 5; `ORC-TQVNTKWFVR` |  |
| 1663 | eutectic: (L)->Si(dia)+Si2W | L: W 0.001; Si(dia): W 0; Si2W: W 0.333333 | experimental | [1] Vahlas 1989; _cites ref. 48_ | Table 8, p. 15, row 6; `ORC-ZJDIXK3HCQ` |  |
| 1661 | eutectic: (L)->Si(dia)+Si2W | L: W 0.014; Si(dia): W 0; Si2W: W 0.333333 | experimental | [1] Vahlas 1989; _cites ref. 53_ | Table 8, p. 15, row 10; `ORC-6DVDW2EERG` |  |
| 1661 | eutectic: (L)->Si(dia)+Si2W | L: W 0.043; Si(dia): W 0; Si2W: W 0.333333 | model | [1] Vahlas 1989 | Table 8, p. 15, row 5; `ORC-MJE4QYEPWR` |  |

## 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–W system (11)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| W5Si3 |  | -145 kJ/mol (basis unstated) |  | model |  |  | [3] Li 2013; _cites Vahlas 1989_ [doi](https://doi.org/10.1016/0364-5916%2889%2990007-2) | Table 3, p. 3, row 6; `ORC-X5ICZCNSTZ.aa694d` |  |
| W5Si3 |  | -138 kJ/mol (basis unstated) | 298.15 | experimental |  |  | [3] Li 2013; _cites Kematick 1993_ [doi](https://doi.org/10.1016/0925-8388%2893%2990543-v) | Table 3, p. 3, row 4; `ORC-DQ5XVEOSHV.1deca5` |  |
| W5Si3 |  | -136 kJ/mol (basis unstated) |  | model |  |  | [3] Li 2013 | Table 3, p. 3, row 7; `ORC-W6VSKXK5WJ.727901` |  |
| W5Si3 |  | -135 kJ/mol (basis unstated) | 298.15 | experimental |  |  | [3] Li 2013; _cites Chart 1975_ [doi](https://doi.org/10.1179/030634575790445215) | Table 3, p. 3, row 3; `ORC-CTLRIFXFZB.b797e3` |  |
| W5Si3 |  | -133 kJ/mol (basis unstated) ± 25 | 298.15 | experimental |  |  | [3] Li 2013; _cites Fujiwara 2005_ [doi](https://doi.org/10.1016/j.jallcom.2004.08.100) | Table 3, p. 3, row 5; `ORC-YDVLH77WJQ.daa7cc` |  |
| WSi2 |  | -93.7 kJ/mol (basis unstated) | 298.15 | experimental |  |  | [3] Li 2013; _cites Robinson 1955_ | Table 3, p. 3, row 2; `ORC-HPIJVRKFS2` |  |
| WSi2 |  | -93 kJ/mol (basis unstated) |  | model |  |  | [3] Li 2013; _cites Vahlas 1989_ [doi](https://doi.org/10.1016/0364-5916%2889%2990007-2) | Table 3, p. 3, row 6; `ORC-X5ICZCNSTZ.9abe38` |  |
| WSi2 |  | -92.7 kJ/mol (basis unstated) | 298.15 | experimental |  |  | [3] Li 2013; _cites Chart 1975_ [doi](https://doi.org/10.1179/030634575790445215) | Table 3, p. 3, row 3; `ORC-CTLRIFXFZB.0d3825` |  |
| WSi2 |  | -82 kJ/mol (basis unstated) ± 6 | 298.15 | experimental |  |  | [3] Li 2013; _cites Fujiwara 2005_ [doi](https://doi.org/10.1016/j.jallcom.2004.08.100) | Table 3, p. 3, row 5; `ORC-YDVLH77WJQ.89aa6c` |  |
| WSi2 |  | -81 kJ/mol (basis unstated) |  | model |  |  | [3] Li 2013 | Table 3, p. 3, row 7; `ORC-W6VSKXK5WJ.988230` |  |
| WSi2 |  | -79.6 kJ/mol (basis unstated) | 298.15 | experimental |  |  | [3] Li 2013; _cites Kematick 1993_ [doi](https://doi.org/10.1016/0925-8388%2893%2990543-v) | Table 3, p. 3, row 4; `ORC-DQ5XVEOSHV.2a1836` |  |

## Other properties

### Phase transition (24)

Table: Phase transition, Si–W system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1685 K | 1685 | Si(dia)->Si(L); _Si(dia): W 0_ | experimental | [1] Vahlas 1989; _cites ref. 1_ | Table 8, p. 15, row 3; `ORC-IE37F544HS` |  |
| Phase transition | 1687 K | 1687 | Si(dia)->Si(L); _Si(dia): W 0_ | model | [1] Vahlas 1989 | Table 8, p. 15, row 1; `ORC-6HY6WAPUHB` |  |
| Phase transition | 1687 K | 1687 | Si(dia)->Si(L); _Si(dia): W 0_ | experimental | [1] Vahlas 1989; _cites ref. 3_ | Table 8, p. 15, row 2; `ORC-R3PW4I2GTD` |  |
| Phase transition | 1693 K | 1693 | Si(dia)->Si(L); _Si(dia): W 0_ | experimental | [1] Vahlas 1989; _cites ref. 51_ | Table 8, p. 15, row 4; `ORC-VGJ7ARQWM3` |  |
| Phase transition | 2275 K | 2275 | Si2W->L; _Si2W: W 0.333_ | model | [1] Vahlas 1989 | Table 8, p. 15, row 11; `ORC-7LEFZUN3DL` |  |
| Phase transition | 2293 K | 2293 | Si2W; _Si2W: W 0.333333; L: W 0.333333_ | experimental | [3] Li 2013; _cites Kocherzhinskii 1973_ | Table 2, p. 3, row 11; `ORC-7WD4C56XZ4` |  |
| Phase transition | 2293 K | 2293 | Si2W->L; _Si2W: W 0.333333_ | experimental | [1] Vahlas 1989; _cites ref. 51_ | Table 8, p. 15, row 15; `ORC-DEL3TDJIJU` |  |
| Phase transition | 2368 K | 2368 | Si3W5; _Si3W5: W 0.625; L: W 0.625_ | experimental | [3] Li 2013; _cites Kocherzhinskii 1973_ | Table 2, p. 3, row 12; `ORC-BREUCRACB6` |  |
| Phase transition | 2368 K | 2368 | Si3W5->(L); _Si3W5: W 0.625_ | experimental | [1] Vahlas 1989; _cites ref. 51_ | Table 8, p. 15, row 27; `ORC-S2IJJ2ARFY` |  |
| Phase transition | 2381 K | 2381 | Si3W5->(L); _Si3W5: W 0.625_ | model | [1] Vahlas 1989 | Table 8, p. 15, row 23; `ORC-4SAK5Y555I` |  |
| Phase transition | 2433 K | 2433 | Si2W; _Si2W: W 0.333333; L: W 0.333333_ | experimental | [3] Li 2013; _cites Maksimov 1969_ | Table 2, p. 3, row 6; `ORC-MNONYTAUEP` |  |
| Phase transition | 2433 K | 2433 | Si2W->L; _Si2W: W 0.333333_ | experimental | [1] Vahlas 1989; _cites ref. 49_ | Table 8, p. 15, row 14; `ORC-ETT3WAZCFK` |  |
| Phase transition | 2433 K | 2433 | Si2W->L; _Si2W: W 0.333333_ | experimental | [1] Vahlas 1989; _cites ref. 53_ | Table 8, p. 15, row 16; `ORC-SY2LZRBH3Q` |  |
| Phase transition | 2436 K | 2436 | Si2W->L; _Si2W: W 0.333333_ | experimental | [1] Vahlas 1989; _cites ref. 48_ | Table 8, p. 15, row 13; `ORC-5XMZGMXNSN` |  |
| Phase transition | 2438 K | 2438 | Si2W; _Si2W: W 0.333333; L: W 0.333333_ | experimental | [3] Li 2013; _cites Kieffer 1952_ | Table 2, p. 3, row 1; `ORC-BD5OOXPGP3` |  |
| Phase transition | 2438 K | 2438 | Si2W->L; _Si2W: W 0.333_ | experimental | [1] Vahlas 1989; _cites ref. 18_ | Table 8, p. 15, row 12; `ORC-I2LWE5QGP2` |  |
| Phase transition | 2583 K | 2583 | Si3W5->(L); _Si3W5: W 0.625_ | experimental | [1] Vahlas 1989; _cites ref. 18_ | Table 8, p. 15, row 26; `ORC-LDVSYHOXRB` |  |
| Phase transition | 2593 K | 2593 | Si3W5; _Si3W5: W 0.625; L: W 0.625_ | experimental | [3] Li 2013; _cites Kieffer 1952_ | Table 2, p. 3, row 2; `ORC-U3SV5XRCFC` |  |
| Phase transition | 2593 K | 2593 | Si3W5; _Si3W5: W 0.625; L: W 0.625_ | experimental | [3] Li 2013; _cites Maksimov 1969_ | Table 2, p. 3, row 7; `ORC-ZOYC7UTJ6D` |  |
| Phase transition | 2593 K | 2593 | Si3W5->(L); _Si3W5: W 0.625_ | experimental | [1] Vahlas 1989; _cites ref. 47_ | Table 8, p. 15, row 24; `ORC-J4JR53BF5R` |  |
| Phase transition | 2641 K | 2641 | Si3W5->(L); _Si3W5: W 0.625_ | experimental | [1] Vahlas 1989; _cites ref. 48_ | Table 8, p. 15, row 25; `ORC-UALZKXAFCJ` |  |
| Phase transition | 3680 K | 3680 | W(bcc)->(L); _W(bcc): W 1_ | experimental | [1] Vahlas 1989; _cites ref. 58_ | Table 8, p. 15, row 36; `ORC-7QXXFGFVRK` |  |
| Phase transition | 3695 K | 3695 | W(bcc)->(L); _W(bcc): W 1_ | experimental | [1] Vahlas 1989; _cites ref. 10_ | Table 8, p. 15, row 35; `ORC-BCK6SE7HY5` |  |
| Phase transition | 3695 K | 3695 | W(bcc)->(L); _W(bcc): W 1_ | model | [1] Vahlas 1989 | Table 8, p. 15, row 34; `ORC-U5FAAX2YMT` |  |

### Crystal structure (4)

Table: Crystal structure, Si–W system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 9.59 Å | 298.15 | W5Si3; _alloy: Si 0.375, W 0.625_ | model | [3] Li 2013; _cites Daams 1991_ | Table 1, p. 2, row 8; `ORC-UZMRHXNLVA.9539ed` |  |
| Lattice a | 3.22 Å | 298.15 | WSi2; _alloy: Si 0.666667, W 0.333333_ | model | [3] Li 2013; _cites Daams 1991_ | Table 1, p. 2, row 9; `ORC-JKAGBUY5KR.4f73d7` |  |
| Lattice c | 4.92 Å | 298.15 | W5Si3; _alloy: Si 0.375, W 0.625_ | model | [3] Li 2013; _cites Daams 1991_ | Table 1, p. 2, row 8; `ORC-UZMRHXNLVA.17ff73` |  |
| Lattice c | 7.83 Å | 298.15 | WSi2; _alloy: Si 0.666667, W 0.333333_ | model | [3] Li 2013; _cites Daams 1991_ | Table 1, p. 2, row 9; `ORC-JKAGBUY5KR.390bc1` |  |

## Sources

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

1. C. Vahlas, P.Y. Chevalier, E. Blanquet, A thermodynamic evaluation of four Si-M (M = Mo, Ta, Ti, W) binary systems, Calphad 13, 273-292 (1989). [doi:10.1016/0364-5916(89)90007-2](https://doi.org/10.1016/0364-5916%2889%2990007-2)
2. Zhongnan Guo, Wenxia Yuan, Yu Sun, Zhoufei Cai, Zhiyu Qiao, Thermodynamic Assessment of the Si-Ta and Si-W Systems, J. Phase Equilib. Diffus. 30, 564-570 (2009). [doi:10.1007/s11669-009-9579-x](https://doi.org/10.1007/s11669-009-9579-x)
3. Yan Li, Changrong Li, Zhenmin Du, Cuiping Guo, Thermodynamic optimization of the Nb–Si–W ternary system, Calphad 43, 112-123 (2013). [doi:10.1016/j.calphad.2013.04.004](https://doi.org/10.1016/j.calphad.2013.04.004)

## 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/).