Hf–W system
5 accepted literature values from 2 paper(s) (experimental 1, model 3, DFT 1); 2 calculated phase diagram(s). 6 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 (5) · papers (bibliography) · Markdown
| Evidence class | Values |
|---|---|
| experimental | 1 |
| model | 3 |
| DFT | 1 |
| Property group | Values |
|---|---|
| formation | 3 |
| crystal structure | 2 |
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 |
|---|---|---|---|
| HfW-02Sha-LB.tdb | G. Shao, Intermetallics, 10, 429-34(2002). doi:10.1016/S0966-9795(02)00017-1 | 078db40d3d1acdff57b462f15eac22fc75242db8dadb9a6a27c002a3104918d9 | viewer · TDB · JSON |
| HfW-12Lie.tdb | A.C. Lieser, C.L. Zacherl, A. Saengdeejing, Z.-K. Liu, L.J. Kecskes, Calphad, 38, 92-99(2012). doi:10.1016/j.calphad.2012.04.005 | 8ac53fc523b760014d23a34f80e81c70ad549946918cba3eee6db63198df4f78 | viewer · TDB · JSON |
| TDB file | T (K) | Phases at the invariant |
|---|---|---|
| HfW-02Sha-LB.tdb | 2771.05 | LIQUID (x(W) 0.52741) + C15_LAVES (x(W) 0.6662) + BCC_A2 (x(W) 0.8924) |
| HfW-02Sha-LB.tdb | 2213.68 | BCC_A2 (x(W) 0.13032) + LIQUID (x(W) 0.21697) + C15_LAVES (x(W) 0.64708) |
| HfW-02Sha-LB.tdb | 1718.04 | HCP_A3 (x(W) 0.01514) + BCC_A2 (x(W) 0.07512) + C15_LAVES (x(W) 0.64626) |
| HfW-12Lie.tdb | 2806.23 | LIQUID (x(W) 0.56433) + C15_LAVES (x(W) 0.66291) + BCC_A2 (x(W) 0.92394) |
| HfW-12Lie.tdb | 2222.06 | BCC_A2 (x(W) 0.12949) + LIQUID (x(W) 0.20418) + C15_LAVES (x(W) 0.65502) |
| HfW-12Lie.tdb | 1826.4 | HCP_A3 (x(W) 3.500e-4) + BCC_A2 (x(W) 0.04381) + C15_LAVES (x(W) 0.65916) |
Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull HfW-02Sha-LB
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 |
|---|---|---|---|---|---|---|---|---|---|
| HfW2–15 | HfW2 | -14.1 kJ/mol-atom | model | -16.679 (mp-aaaaacbw) | -16.555 (oqmd-17394) | [1] Shao 2002 | Table 1, p. 5, row 3 report | ||
| HfW2–15 | HfW2 | -8 kJ/mol-atom | model | -16.679 (mp-aaaaacbw) | -16.555 (oqmd-17394) | [1] Shao 2002 cites de Boer FR 1989 | Table 1, p. 5, row 2 report | ||
| HfW2–15 | HfW2 | -3 kJ/mol-atom | model | -16.679 (mp-aaaaacbw) | -16.555 (oqmd-17394) | [1] Shao 2002 cites Lee 1986 doi | Table 1, p. 5, row 1 report |
Other properties
Crystal structure (2)
| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---|---|---|---|---|---|---|
| Lattice a | 7.617 Å | HfW2 alloy: W 0.666667 | DFT | [2] Lieser 2012 | Table 1, p. 4, row 10 report | ||
| Lattice a | 7.593 Å | 298.15 | HfW2 alloy: W 0.666667 | experimental | [2] Lieser 2012 cites Braun 1960 | Table 1, p. 4, row 11 report |
Sources
Reporting papers the values were read from (a value cited from another work names that work in its row).
- G. Shao, Thermodynamic assessment of the Hf–Mo and Hf–W systems, Intermetallics 10, 429-434 (2002). doi:10.1016/s0966-9795(02)00017-1
- Alyson C. Lieser, Chelsey L. Zacherl, Arkapol Saengdeejing, Zi-Kui Liu, Laszlo J. Kecskes, First-principles calculations and thermodynamic re-modeling of the Hf–W system, Calphad 38, 92-99 (2012). doi:10.1016/j.calphad.2012.04.005