# Fe–W phases > Fe–W system: 6 phases (tier A 5, liquid 1); 5 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references. HTML: https://data.orchid-project.org/phases/pages/FE-W.html · Markdown: https://data.orchid-project.org/phases/pages/FE-W.md 6 phases (tier A 5, liquid 1); 5 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model). Data: [interactive registry](https://orchid-project.org/phases/?q=FE-W) · [full JSON](https://data.orchid-project.org/phases/systems/FE-W.json) · [Fe–W system page](https://data.orchid-project.org/systems/FE-W.html) · [Markdown](https://data.orchid-project.org/phases/pages/FE-W.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the Fe–W system (6) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [BCC_A2](#phase-fe-w-bcc-a2); _phase:fe-w:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 300–3999.9 K, x(W) 0–1 | 0 | 3 | | [C14_LAVES](#phase-fe-w-c14-laves); _phase:fe-w:c14-laves_ | MgZn2 · C14 · hP12 · P6_3/mmc (194) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 300–1335.45 K, x(W) 0.32844–0.33333 | 0 | 3 | | [MU_D85](#phase-fe-w-d85-mu); _phase:fe-w:d85-mu_ | Fe7W6 · D8_5 · hR13 · R-3m (166) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 300–1914.37 K, x(W) 0.39185–0.46154 | 0 | 3 | | [FCC_A1](#phase-fe-w-fcc-a1); _phase:fe-w:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 873.57–1832.32 K, x(W) 0–0.01357 | 0 | 3 | | [HCP_A3](#phase-fe-w-hcp-a3); _phase:fe-w:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | not stable in 3 calculated diagram(s) | 0 | 3 | | [LIQUID](#phase-fe-w-liquid); _phase:fe-w:liquid_ | liquid | liquid | stable in 3 of 3 calculated diagram(s): 1805.91–4000 K, x(W) 0–1 | 0 | 3 | ## BCC_A2 (Fe–W) - Id: `phase:fe-w:bcc-a2`; status `assigned` - Structure: W · A2 · cI2 · Im-3m (229); type `st:a2-w-ci2`; tier A: standard phase name; confidence high - Stability: stable in 3 of 3 calculated diagram(s): 300–3999.9 K, x(W) 0–1 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-w:bcc-a2) Names (4): _corpus: _corpus:phase:fe-w:bcc-a2 _tdb: _tdb:FeW-15Jac-phonon.tdb:BCC_A2, tdb:FeW-15Jac-static.tdb:BCC_A2, tdb:FeW-87Gus-LB.tdb:BCC_A2 ### TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written [FeW-15Jac-phonon.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-phonon.tdb): BCC_A2, type code %B, sha256 `3c044c4de34afca7…` ~~~~text 31: PHASE BCC_A2 %B 2 1 3 ! 32: CONST BCC_A2 : FE W : VA : ! ~~~~ [FeW-15Jac-static.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-static.tdb): BCC_A2, type code %B, sha256 `40556b11f6faf2f1…` ~~~~text 31: PHASE BCC_A2 %B 2 1 3 ! 32: CONST BCC_A2 : FE W : VA : ! ~~~~ [FeW-87Gus-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-87Gus-LB.tdb): BCC_A2, type code %B, sha256 `0f42cbd0e7a82e6e…` ~~~~text 35: PHASE BCC_A2 %B 2 1 3 ! 36: CONST BCC_A2 : FE W : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/BF02825699](https://doi.org/10.1007/BF02825699) P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987). _assessment that models this phase_ - [doi:10.1016/j.calphad.2015.04.010](https://doi.org/10.1016/j.calphad.2015.04.010) A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015). _assessment that models this phase_ ## C14_LAVES (Fe–W) - Id: `phase:fe-w:c14-laves`; status `assigned` - Structure: MgZn2 · C14 · hP12 · P6_3/mmc (194); type `st:c14-mgzn2-hp12`; tier A: standard phase name; confidence high - Caveat: partitioned order/disorder model in FeW-15Jac-phonon.tdb also describes the disordered state - Caveat: partitioned order/disorder model in FeW-15Jac-static.tdb also describes the disordered state - Caveat: partitioned order/disorder model in FeW-87Gus-LB.tdb also describes the disordered state - Stability: stable in 3 of 3 calculated diagram(s): 300–1335.45 K, x(W) 0.32844–0.33333 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-w:c14-laves) Names (4): _corpus: _corpus:phase:fe-w:c14-laves _tdb: _tdb:FeW-15Jac-phonon.tdb:C14_LAVES, tdb:FeW-15Jac-static.tdb:C14_LAVES, tdb:FeW-87Gus-LB.tdb:C14_LAVES ### TDB models of C14_LAVES (3): PHASE and CONSTITUENT statements as written [FeW-15Jac-phonon.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-phonon.tdb): C14_LAVES, type code %, sha256 `3c044c4de34afca7…` ~~~~text 41: PHASE C14_LAVES % 2 2 1 ! 42: CONST C14_LAVES : FE W : FE W : ! ~~~~ [FeW-15Jac-static.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-static.tdb): C14_LAVES, type code %, sha256 `40556b11f6faf2f1…` ~~~~text 41: PHASE C14_LAVES % 2 2 1 ! 42: CONST C14_LAVES : FE W : FE W : ! ~~~~ [FeW-87Gus-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-87Gus-LB.tdb): C14_LAVES, type code %, sha256 `0f42cbd0e7a82e6e…` ~~~~text 45: PHASE C14_LAVES % 2 2 1 ! 46: CONST C14_LAVES : FE% W : FE W% : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/BF02825699](https://doi.org/10.1007/BF02825699) P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987). _assessment that models this phase_ - [doi:10.1016/j.calphad.2015.04.010](https://doi.org/10.1016/j.calphad.2015.04.010) A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015). _assessment that models this phase_ ## MU_D85 (Fe–W) - Id: `phase:fe-w:d85-mu`; status `assigned` - Structure: Fe7W6 · D8_5 · hR13 · R-3m (166); type `st:d8-5-fe7w6-hr13`; tier A: standard phase name; confidence high - Caveat: partitioned order/disorder model in FeW-15Jac-phonon.tdb also describes the disordered state - Caveat: partitioned order/disorder model in FeW-15Jac-static.tdb also describes the disordered state - Stability: stable in 3 of 3 calculated diagram(s): 300–1914.37 K, x(W) 0.39185–0.46154 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-w:d85-mu) Names (4): _corpus: _corpus:phase:fe-w:d85-mu _tdb: _tdb:FeW-15Jac-phonon.tdb:MU_D85, tdb:FeW-15Jac-static.tdb:MU_D85, tdb:FeW-87Gus-LB.tdb:MU_D85 ### TDB models of MU_D85 (3): PHASE and CONSTITUENT statements as written [FeW-15Jac-phonon.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-phonon.tdb): MU_D85, type code %, sha256 `3c044c4de34afca7…` ~~~~text 46: PHASE MU_D85 % 4 1 4 2 6 ! 47: CONST MU_D85 : FE W : W : FE W : FE W : ! ~~~~ [FeW-15Jac-static.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-static.tdb): MU_D85, type code %, sha256 `40556b11f6faf2f1…` ~~~~text 46: PHASE MU_D85 % 4 1 4 2 6 ! 47: CONST MU_D85 : FE W : W : FE W : FE W : ! ~~~~ [FeW-87Gus-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-87Gus-LB.tdb): MU_D85, type code %, sha256 `0f42cbd0e7a82e6e…` ~~~~text 50: PHASE MU_D85 % 3 7 2 4 ! 51: CONST MU_D85 : FE : W : FE W% : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/BF02825699](https://doi.org/10.1007/BF02825699) P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987). _assessment that models this phase_ - [doi:10.1016/j.calphad.2015.04.010](https://doi.org/10.1016/j.calphad.2015.04.010) A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015). _assessment that models this phase_ ## FCC_A1 (Fe–W) - Id: `phase:fe-w:fcc-a1`; status `assigned` - Structure: Cu · A1 · cF4 · Fm-3m (225); type `st:a1-cu-cf4`; tier A: standard phase name; confidence high - Stability: stable in 3 of 3 calculated diagram(s): 873.57–1832.32 K, x(W) 0–0.01357 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-w:fcc-a1) Names (4): _corpus: _corpus:phase:fe-w:fcc-a1 _tdb: _tdb:FeW-15Jac-phonon.tdb:FCC_A1, tdb:FeW-15Jac-static.tdb:FCC_A1, tdb:FeW-87Gus-LB.tdb:FCC_A1 ### TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written [FeW-15Jac-phonon.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-phonon.tdb): FCC_A1, type code %A, sha256 `3c044c4de34afca7…` ~~~~text 26: PHASE FCC_A1 %A 2 1 1 ! 27: CONST FCC_A1 : FE W : VA : ! ~~~~ [FeW-15Jac-static.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-static.tdb): FCC_A1, type code %A, sha256 `40556b11f6faf2f1…` ~~~~text 26: PHASE FCC_A1 %A 2 1 1 ! 27: CONST FCC_A1 : FE W : VA : ! ~~~~ [FeW-87Gus-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-87Gus-LB.tdb): FCC_A1, type code %A, sha256 `0f42cbd0e7a82e6e…` ~~~~text 30: PHASE FCC_A1 %A 2 1 1 ! 31: CONST FCC_A1 : FE W : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/BF02825699](https://doi.org/10.1007/BF02825699) P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987). _assessment that models this phase_ - [doi:10.1016/j.calphad.2015.04.010](https://doi.org/10.1016/j.calphad.2015.04.010) A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015). _assessment that models this phase_ ## HCP_A3 (Fe–W) - Id: `phase:fe-w:hcp-a3`; status `assigned` - Structure: Mg · A3 · hP2 · P6_3/mmc (194); type `st:a3-mg-hp2`; tier A: standard phase name; confidence high - Stability: not stable in 3 calculated diagram(s) - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-w:hcp-a3) Names (4): _corpus: _corpus:phase:fe-w:hcp-a3 _tdb: _tdb:FeW-15Jac-phonon.tdb:HCP_A3, tdb:FeW-15Jac-static.tdb:HCP_A3, tdb:FeW-87Gus-LB.tdb:HCP_A3 ### TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written [FeW-15Jac-phonon.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-phonon.tdb): HCP_A3, type code %, sha256 `3c044c4de34afca7…` ~~~~text 36: PHASE HCP_A3 % 2 1 0.5 ! 37: CONST HCP_A3 : FE W : VA : ! ~~~~ [FeW-15Jac-static.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-static.tdb): HCP_A3, type code %, sha256 `40556b11f6faf2f1…` ~~~~text 36: PHASE HCP_A3 % 2 1 0.5 ! 37: CONST HCP_A3 : FE W : VA : ! ~~~~ [FeW-87Gus-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-87Gus-LB.tdb): HCP_A3, type code %, sha256 `0f42cbd0e7a82e6e…` ~~~~text 40: PHASE HCP_A3 % 2 1 0.5 ! 41: CONST HCP_A3 : FE W : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/BF02825699](https://doi.org/10.1007/BF02825699) P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987). _assessment that models this phase_ - [doi:10.1016/j.calphad.2015.04.010](https://doi.org/10.1016/j.calphad.2015.04.010) A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015). _assessment that models this phase_ ## LIQUID (Fe–W) - Id: `phase:fe-w:liquid`; status `assigned` - Structure: liquid; type `st:liquid`; liquid; confidence high - Stability: stable in 3 of 3 calculated diagram(s): 1805.91–4000 K, x(W) 0–1 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:fe-w:liquid) Names (4): _corpus: _corpus:phase:fe-w:liquid _tdb: _tdb:FeW-15Jac-phonon.tdb:LIQUID, tdb:FeW-15Jac-static.tdb:LIQUID, tdb:FeW-87Gus-LB.tdb:LIQUID ### TDB models of LIQUID (3): PHASE and CONSTITUENT statements as written [FeW-15Jac-phonon.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-phonon.tdb): LIQUID, type code %, sha256 `3c044c4de34afca7…` ~~~~text 21: PHASE LIQUID:L % 1 1 ! 22: CONST LIQUID:L : FE W : ! ~~~~ [FeW-15Jac-static.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-15Jac-static.tdb): LIQUID, type code %, sha256 `40556b11f6faf2f1…` ~~~~text 21: PHASE LIQUID:L % 1 1 ! 22: CONST LIQUID:L : FE W : ! ~~~~ [FeW-87Gus-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/FeW-87Gus-LB.tdb): LIQUID, type code %, sha256 `0f42cbd0e7a82e6e…` ~~~~text 25: PHASE LIQUID:L % 1 1 ! 26: CONST LIQUID:L : FE W : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/BF02825699](https://doi.org/10.1007/BF02825699) P. Gustafson, Metall. Trans. A, 18A, 175-88 (1987). _assessment that models this phase_ - [doi:10.1016/j.calphad.2015.04.010](https://doi.org/10.1016/j.calphad.2015.04.010) A. Jacob, C. Schmetterer, L. Singheiser, A. Gray-Weale, B. Hallstedt, A. Watson, Calphad, 50, 92-104(2015). _assessment that models this phase_ ## Please cite - R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735970 - 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 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); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work). 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_phase_registry_2026, author = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon}, title = {{ORCHID-Registry: phase registry of binary systems}}, version = {2026.10}, publisher = {Zenodo}, year = {2026}, doi = {10.5281/zenodo.23735970}, url = {https://doi.org/10.5281/zenodo.23735970}, note = {Version 1, machine-extracted} } @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 the ORCHID phase registry and the sources named on the page (TDB assessments, Hallstedt 2025, Materials Project, OQMD). TDB statements are quoted as written; parameter expressions are not reproduced. Field reference: [SCHEMA.md](https://data.orchid-project.org/phases/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt).