Si–W system
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 · CSV · interactive explorer · interactive phase diagram · phases (7) · papers (bibliography) · Markdown
| Evidence class | Values |
|---|---|
| experimental | 58 |
| model | 20 |
| 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.
| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| SiW-03Che-LB.tdb | P.-Y. Chevalier, E. Fischer, unpublished, 2003. | 980d470108b9356014b6a28aedaff9d818a3785bf4b9d86044bce6c3fb688023 | viewer · TDB · 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 | 5f6d911f9b50695896885bab52759251967d3aeb5536938d44554d602e33a85f | viewer · TDB · 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 | 6cb14cc0019fd85687d871a41d2eadee3ed10a9f84d075558c911dca731f1d55 | viewer · TDB · JSON |
| SiW-89Vah.tdb | C. Vahlas, P.-Y. Chevalier, E. Blanquet, Calphad, 13, 273-92(1989). doi:10.1016/0364-5916(89)90007-2 | 1b97c566f7b1735ce36c841c697dde9e201aeb64f8c5c00322f49c792b83ab23 | viewer · TDB · JSON |
| 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 · OQMD DFT hull · CALPHAD hull SiW-03Che-LB · CALPHAD hull SiW-09Guo · CALPHAD hull SiW-89Vah
Invariant reactions (literature)
| 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 report | |
| 2594 | congruent melting: L <-> W5Si3 | W5Si3: Si 0.375 | model | [2] Guo 2009 | Table 5, p. 5, row 4 report | |
| 2593 | congruent melting: L <-> W5Si3 | W5Si3: Si 0.375 | experimental | [2] Guo 2009 cites Maksimov 1969 | Table 5, p. 5, row 5 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 2453 | eutectic: L->Bcc+W5Si3 | W5Si3: W 0.625 | experimental | [3] Li 2013 cites Maksimov 1969 | Table 2, p. 3, row 3 report | |
| 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 report | |
| 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 report | |
| 2433 | congruent melting: L <-> WSi2 | WSi2: Si 0.667 | model | [2] Guo 2009 | Table 5, p. 5, row 10 report | |
| 2433 | congruent melting: L <-> WSi2 | WSi2: Si 0.667 | experimental | [2] Guo 2009 cites Maksimov 1969 | Table 5, p. 5, row 11 report | |
| 2368 | congruent melting: L <-> W5Si3 | W5Si3: Si 0.375 | experimental | [2] Guo 2009 cites Yu 1973 | Table 5, p. 5, row 6 report | |
| 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 report | |
| 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 report | |
| 2358 | eutectic: L->Bcc+W5Si3 | W5Si3: W 0.625 | experimental | [3] Li 2013 cites Kocherzhinskii 1973 | Table 2, p. 3, row 8 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 2293 | congruent melting: L <-> WSi2 | WSi2: Si 0.667 | experimental | [2] Guo 2009 cites Yu 1973 | Table 5, p. 5, row 12 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report |
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.
| 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 | Table 3, p. 3, row 6 report | |||||
| W5Si3 | -138 kJ/mol (basis unstated) | 298.15 | experimental | [3] Li 2013 cites Kematick 1993 doi | Table 3, p. 3, row 4 report | ||||
| W5Si3 | -136 kJ/mol (basis unstated) | model | [3] Li 2013 | Table 3, p. 3, row 7 report | |||||
| W5Si3 | -135 kJ/mol (basis unstated) | 298.15 | experimental | [3] Li 2013 cites Chart 1975 doi | Table 3, p. 3, row 3 report | ||||
| W5Si3 | -133 kJ/mol (basis unstated) ± 25 | 298.15 | experimental | [3] Li 2013 cites Fujiwara 2005 doi | Table 3, p. 3, row 5 report | ||||
| WSi2 | -93.7 kJ/mol (basis unstated) | 298.15 | experimental | [3] Li 2013 cites Robinson 1955 | Table 3, p. 3, row 2 report | ||||
| WSi2 | -93 kJ/mol (basis unstated) | model | [3] Li 2013 cites Vahlas 1989 doi | Table 3, p. 3, row 6 report | |||||
| WSi2 | -92.7 kJ/mol (basis unstated) | 298.15 | experimental | [3] Li 2013 cites Chart 1975 doi | Table 3, p. 3, row 3 report | ||||
| WSi2 | -82 kJ/mol (basis unstated) ± 6 | 298.15 | experimental | [3] Li 2013 cites Fujiwara 2005 doi | Table 3, p. 3, row 5 report | ||||
| WSi2 | -81 kJ/mol (basis unstated) | model | [3] Li 2013 | Table 3, p. 3, row 7 report | |||||
| WSi2 | -79.6 kJ/mol (basis unstated) | 298.15 | experimental | [3] Li 2013 cites Kematick 1993 doi | Table 3, p. 3, row 4 report |
Other properties
Phase transition (24)
| 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 report | |
| Phase transition | 1687 K | 1687 | Si(dia)->Si(L) Si(dia): W 0 | model | [1] Vahlas 1989 | Table 8, p. 15, row 1 report | |
| 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 report | |
| 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 report | |
| Phase transition | 2275 K | 2275 | Si2W->L Si2W: W 0.333 | model | [1] Vahlas 1989 | Table 8, p. 15, row 11 report | |
| 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 report | |
| Phase transition | 2293 K | 2293 | Si2W->L Si2W: W 0.333333 | experimental | [1] Vahlas 1989 cites ref. 51 | Table 8, p. 15, row 15 report | |
| 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 report | |
| Phase transition | 2368 K | 2368 | Si3W5->(L) Si3W5: W 0.625 | experimental | [1] Vahlas 1989 cites ref. 51 | Table 8, p. 15, row 27 report | |
| Phase transition | 2381 K | 2381 | Si3W5->(L) Si3W5: W 0.625 | model | [1] Vahlas 1989 | Table 8, p. 15, row 23 report | |
| 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 report | |
| Phase transition | 2433 K | 2433 | Si2W->L Si2W: W 0.333333 | experimental | [1] Vahlas 1989 cites ref. 49 | Table 8, p. 15, row 14 report | |
| Phase transition | 2433 K | 2433 | Si2W->L Si2W: W 0.333333 | experimental | [1] Vahlas 1989 cites ref. 53 | Table 8, p. 15, row 16 report | |
| Phase transition | 2436 K | 2436 | Si2W->L Si2W: W 0.333333 | experimental | [1] Vahlas 1989 cites ref. 48 | Table 8, p. 15, row 13 report | |
| 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 report | |
| Phase transition | 2438 K | 2438 | Si2W->L Si2W: W 0.333 | experimental | [1] Vahlas 1989 cites ref. 18 | Table 8, p. 15, row 12 report | |
| Phase transition | 2583 K | 2583 | Si3W5->(L) Si3W5: W 0.625 | experimental | [1] Vahlas 1989 cites ref. 18 | Table 8, p. 15, row 26 report | |
| 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 report | |
| 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 report | |
| Phase transition | 2593 K | 2593 | Si3W5->(L) Si3W5: W 0.625 | experimental | [1] Vahlas 1989 cites ref. 47 | Table 8, p. 15, row 24 report | |
| Phase transition | 2641 K | 2641 | Si3W5->(L) Si3W5: W 0.625 | experimental | [1] Vahlas 1989 cites ref. 48 | Table 8, p. 15, row 25 report | |
| 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 report | |
| 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 report | |
| Phase transition | 3695 K | 3695 | W(bcc)->(L) W(bcc): W 1 | model | [1] Vahlas 1989 | Table 8, p. 15, row 34 report |
Crystal structure (4)
| 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 report | |
| 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 report | |
| 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 report | |
| 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 report |
Sources
Reporting papers the values were read from (a value cited from another work names that work in its row).
- 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
- 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
- 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