Fe–V phases

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 · full JSON · Fe–V system page · Markdown · field reference

Phases of the Fe–V system (6)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:fe-v:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 5 of 5 calculated diagram(s): 300–3999.69 K, x(V) 0–1	0	5
SIGMA_D8B phase:fe-v:d8b-sigma	sigma-CrFe · D8_b · tP30 · P4_2/mnm (136)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–1517.26 K, x(V) 0.31785–0.66949	0	4
FCC_A1 phase:fe-v:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 5 of 5 calculated diagram(s): 759.96–1774.96 K, x(V) 0–0.01384	0	5
HCP_A3 phase:fe-v:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 5 calculated diagram(s)	0	5
LIQUID phase:fe-v:liquid	liquid	liquid	stable in 5 of 5 calculated diagram(s): 1733.01–4000 K, x(V) 0–1	1	5
SIGMA_OLD phase:fe-v:old-sigma	sigma-CrFe · D8_b · tP30 · P4_2/mnm (136)	tier A: standard phase name	stable in 2 of 3 calculated diagram(s): 300–1524.31 K, x(V) 0.2957–0.73331	0	3

BCC_A2 (Fe–V)

Id: phase:fe-v: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 5 of 5 calculated diagram(s): 300–3999.69 K, x(V) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:fe-v:bcc-a2
tdb: tdb:FeV-12Guo.tdb:BCC_A2, tdb:FeV-23Pan.tdb:BCC_A2, tdb:FeV-83And.tdb:BCC_A2, tdb:FeV-91Har.tdb:BCC_A2, tdb:FeV-91Hua-LB.tdb:BCC_A2

TDB models of BCC_A2 (5): PHASE and CONSTITUENT statements as written

FeV-12Guo.tdb: BCC_A2, type code %B, sha256 16cbad7b1e894fc9…

32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : FE% V% : VA : !

FeV-23Pan.tdb: BCC_A2, type code %B, sha256 628bcb5606df1ede…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : FE% V% : VA : !

FeV-83And.tdb: BCC_A2, type code %B, sha256 ae3a5084e051fc28…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : FE% V% : VA : !

FeV-91Har.tdb: BCC_A2, type code %B, sha256 6a58f15acd80cf54…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : FE% V% : VA : !

FeV-91Hua-LB.tdb: BCC_A2, type code %B, sha256 879c739fcb81e871…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : FE% V% : VA : !

Example references (5 of 5; assessments first):

doi:10.1016/0364-5916(83)90010-X J.-O. Andersson, Calphad, 7, 305-15(1983).
assessment that models this phase
doi:10.1016/0364-5916(91)90008-8 K.C. Hari Kumar, V. Raghavan, A thermodynamic reassessment of the FE-V system, Calphad 15, 307-314 (1991).
assessment that models this phase
doi:10.1016/j.calphad.2012.06.010 Cuiping Guo, Changrong Li, Xiang Zheng, Zhenmin Du, Thermodynamic modeling of the Fe–Ti–V system, Calphad 38, 155-160 (2012).
assessment that models this phase
doi:10.1016/j.calphad.2023.102529 Q. Pan, W. Liu, T. Wu, W. Zheng, J. Wang, X.G. Lu, Thermodynamic reassessment of Fe–Nb–V system, Calphad Comput. Coupling Phase Diagrams Thermochem. 80 (2023) 102529, https://doi.org/10.1016/j.calphad.2023.102529.
assessment that models this phase
doi:10.1515/ijmr-1991-820510 W. Huang, Z. Metallkd., 82, 391-401(1991).
assessment that models this phase

SIGMA_D8B (Fe–V)

Id: phase:fe-v:d8b-sigma; status assigned
Structure: sigma-CrFe · D8_b · tP30 · P4_2/mnm (136); type st:d8-b-sigma-crfe-tp30; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in FeV-12Guo.tdb also describes the disordered state
Caveat: partitioned order/disorder model in FeV-23Pan.tdb also describes the disordered state
Caveat: partitioned order/disorder model in FeV-91Hua-LB.tdb also describes the disordered state
Stability: stable in 4 of 4 calculated diagram(s): 300–1517.26 K, x(V) 0.31785–0.66949
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:fe-v:d8b-sigma
tdb: tdb:FeV-12Guo.tdb:SIGMA_D8B, tdb:FeV-23Pan.tdb:SIGMA_D8B, tdb:FeV-83And.tdb:SIGMA_D8B, tdb:FeV-91Hua-LB.tdb:SIGMA_D8B

TDB models of SIGMA_D8B (4): PHASE and CONSTITUENT statements as written

FeV-12Guo.tdb: SIGMA_D8B, type code %, sha256 16cbad7b1e894fc9…

42: PHASE SIGMA_D8B % 2 1 2 !
43: CONST SIGMA_D8B : FE V : FE V : !

FeV-23Pan.tdb: SIGMA_D8B, type code %, sha256 628bcb5606df1ede…

46: PHASE SIGMA_D8B % 3 10 4 16 !
47: CONST SIGMA_D8B : FE V : FE V : FE V : !

FeV-83And.tdb: SIGMA_D8B, type code %, sha256 ae3a5084e051fc28…

43: PHASE SIGMA_D8B % 3 10 4 16 !
44: CONST SIGMA_D8B : FE : V : FE V : !

FeV-91Hua-LB.tdb: SIGMA_D8B, type code %, sha256 879c739fcb81e871…

45: PHASE SIGMA_D8B % 3 10 4 16 !
46: CONST SIGMA_D8B : FE V : V : FE V : !

Example references (4 of 4; assessments first):

doi:10.1016/0364-5916(83)90010-X J.-O. Andersson, Calphad, 7, 305-15(1983).
assessment that models this phase
doi:10.1016/j.calphad.2012.06.010 Cuiping Guo, Changrong Li, Xiang Zheng, Zhenmin Du, Thermodynamic modeling of the Fe–Ti–V system, Calphad 38, 155-160 (2012).
assessment that models this phase
doi:10.1016/j.calphad.2023.102529 Q. Pan, W. Liu, T. Wu, W. Zheng, J. Wang, X.G. Lu, Thermodynamic reassessment of Fe–Nb–V system, Calphad Comput. Coupling Phase Diagrams Thermochem. 80 (2023) 102529, https://doi.org/10.1016/j.calphad.2023.102529.
assessment that models this phase
doi:10.1515/ijmr-1991-820510 W. Huang, Z. Metallkd., 82, 391-401(1991).
assessment that models this phase

FCC_A1 (Fe–V)

Id: phase:fe-v: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 5 of 5 calculated diagram(s): 759.96–1774.96 K, x(V) 0–0.01384
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:fe-v:fcc-a1
tdb: tdb:FeV-12Guo.tdb:FCC_A1, tdb:FeV-23Pan.tdb:FCC_A1, tdb:FeV-83And.tdb:FCC_A1, tdb:FeV-91Har.tdb:FCC_A1, tdb:FeV-91Hua-LB.tdb:FCC_A1

TDB models of FCC_A1 (5): PHASE and CONSTITUENT statements as written

FeV-12Guo.tdb: FCC_A1, type code %A, sha256 16cbad7b1e894fc9…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : FE% V : VA : !

FeV-23Pan.tdb: FCC_A1, type code %A, sha256 628bcb5606df1ede…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : FE% V : VA : !

FeV-83And.tdb: FCC_A1, type code %A, sha256 ae3a5084e051fc28…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : FE% V : VA : !

FeV-91Har.tdb: FCC_A1, type code %A, sha256 6a58f15acd80cf54…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : FE% V : VA : !

FeV-91Hua-LB.tdb: FCC_A1, type code %A, sha256 879c739fcb81e871…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : FE% V : VA : !

Example references (5 of 5; assessments first):

doi:10.1016/0364-5916(83)90010-X J.-O. Andersson, Calphad, 7, 305-15(1983).
assessment that models this phase
doi:10.1016/0364-5916(91)90008-8 K.C. Hari Kumar, V. Raghavan, A thermodynamic reassessment of the FE-V system, Calphad 15, 307-314 (1991).
assessment that models this phase
doi:10.1016/j.calphad.2012.06.010 Cuiping Guo, Changrong Li, Xiang Zheng, Zhenmin Du, Thermodynamic modeling of the Fe–Ti–V system, Calphad 38, 155-160 (2012).
assessment that models this phase
doi:10.1016/j.calphad.2023.102529 Q. Pan, W. Liu, T. Wu, W. Zheng, J. Wang, X.G. Lu, Thermodynamic reassessment of Fe–Nb–V system, Calphad Comput. Coupling Phase Diagrams Thermochem. 80 (2023) 102529, https://doi.org/10.1016/j.calphad.2023.102529.
assessment that models this phase
doi:10.1515/ijmr-1991-820510 W. Huang, Z. Metallkd., 82, 391-401(1991).
assessment that models this phase

HCP_A3 (Fe–V)

Id: phase:fe-v: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 5 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:fe-v:hcp-a3
tdb: tdb:FeV-12Guo.tdb:HCP_A3, tdb:FeV-23Pan.tdb:HCP_A3, tdb:FeV-83And.tdb:HCP_A3, tdb:FeV-91Har.tdb:HCP_A3, tdb:FeV-91Hua-LB.tdb:HCP_A3

TDB models of HCP_A3 (5): PHASE and CONSTITUENT statements as written

FeV-12Guo.tdb: HCP_A3, type code %A, sha256 16cbad7b1e894fc9…

37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : FE V : VA : !

FeV-23Pan.tdb: HCP_A3, type code %A, sha256 628bcb5606df1ede…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : FE V : VA : !

FeV-83And.tdb: HCP_A3, type code %A, sha256 ae3a5084e051fc28…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : FE V : VA : !

FeV-91Har.tdb: HCP_A3, type code %A, sha256 6a58f15acd80cf54…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : FE V : VA : !

FeV-91Hua-LB.tdb: HCP_A3, type code %A, sha256 879c739fcb81e871…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : FE V : VA : !

Example references (5 of 5; assessments first):

doi:10.1016/0364-5916(83)90010-X J.-O. Andersson, Calphad, 7, 305-15(1983).
assessment that models this phase
doi:10.1016/0364-5916(91)90008-8 K.C. Hari Kumar, V. Raghavan, A thermodynamic reassessment of the FE-V system, Calphad 15, 307-314 (1991).
assessment that models this phase
doi:10.1016/j.calphad.2012.06.010 Cuiping Guo, Changrong Li, Xiang Zheng, Zhenmin Du, Thermodynamic modeling of the Fe–Ti–V system, Calphad 38, 155-160 (2012).
assessment that models this phase
doi:10.1016/j.calphad.2023.102529 Q. Pan, W. Liu, T. Wu, W. Zheng, J. Wang, X.G. Lu, Thermodynamic reassessment of Fe–Nb–V system, Calphad Comput. Coupling Phase Diagrams Thermochem. 80 (2023) 102529, https://doi.org/10.1016/j.calphad.2023.102529.
assessment that models this phase
doi:10.1515/ijmr-1991-820510 W. Huang, Z. Metallkd., 82, 391-401(1991).
assessment that models this phase

LIQUID (Fe–V)

Id: phase:fe-v:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 5 of 5 calculated diagram(s): 1733.01–4000 K, x(V) 0–1
Literature: 1 values (1 accepted) from 1 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:fe-v:liquid
paper: paper:10.1016/0364-5916(91)90018-f:liquid
tdb: tdb:FeV-12Guo.tdb:LIQUID, tdb:FeV-23Pan.tdb:LIQUID, tdb:FeV-83And.tdb:LIQUID, tdb:FeV-91Har.tdb:LIQUID, tdb:FeV-91Hua-LB.tdb:LIQUID

TDB models of LIQUID (5): PHASE and CONSTITUENT statements as written

FeV-12Guo.tdb: LIQUID, type code %, sha256 16cbad7b1e894fc9…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : FE V : !

FeV-23Pan.tdb: LIQUID, type code %, sha256 628bcb5606df1ede…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : FE V : !

FeV-83And.tdb: LIQUID, type code %, sha256 ae3a5084e051fc28…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : FE V : !

FeV-91Har.tdb: LIQUID, type code %, sha256 6a58f15acd80cf54…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : FE V : !

FeV-91Hua-LB.tdb: LIQUID, type code %, sha256 879c739fcb81e871…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : FE V : !

Example references (6 of 6; assessments first):

doi:10.1016/0364-5916(83)90010-X J.-O. Andersson, Calphad, 7, 305-15(1983).
assessment that models this phase
doi:10.1016/0364-5916(91)90008-8 K.C. Hari Kumar, V. Raghavan, A thermodynamic reassessment of the FE-V system, Calphad 15, 307-314 (1991).
assessment that models this phase
doi:10.1016/j.calphad.2012.06.010 Cuiping Guo, Changrong Li, Xiang Zheng, Zhenmin Du, Thermodynamic modeling of the Fe–Ti–V system, Calphad 38, 155-160 (2012).
assessment that models this phase
doi:10.1016/j.calphad.2023.102529 Q. Pan, W. Liu, T. Wu, W. Zheng, J. Wang, X.G. Lu, Thermodynamic reassessment of Fe–Nb–V system, Calphad Comput. Coupling Phase Diagrams Thermochem. 80 (2023) 102529, https://doi.org/10.1016/j.calphad.2023.102529.
assessment that models this phase
doi:10.1515/ijmr-1991-820510 W. Huang, Z. Metallkd., 82, 391-401(1991).
assessment that models this phase
doi:10.1016/0364-5916(91)90018-f Weiming Huang, A Thermodynamic Analysis of the Mn-V And Fe-Mn-V Systems, Calphad 15, 195-208 (1991).
reports values for this phase

SIGMA_OLD (Fe–V)

Id: phase:fe-v:old-sigma; status assigned
Structure: sigma-CrFe · D8_b · tP30 · P4_2/mnm (136); type st:d8-b-sigma-crfe-tp30; tier A: standard phase name; confidence high
Stability: stable in 2 of 3 calculated diagram(s): 300–1524.31 K, x(V) 0.2957–0.73331
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-v:old-sigma
tdb: tdb:FeV-83And.tdb:SIGMA_OLD, tdb:FeV-91Har.tdb:SIGMA_OLD, tdb:FeV-91Hua-LB.tdb:SIGMA_OLD

TDB models of SIGMA_OLD (3): PHASE and CONSTITUENT statements as written

FeV-83And.tdb: SIGMA_OLD, type code %, sha256 ae3a5084e051fc28…

48: PHASE SIGMA_OLD % 3 8 4 18 !
49: CONST SIGMA_OLD : FE : V : FE V : !

FeV-91Har.tdb: SIGMA_OLD, type code %, sha256 6a58f15acd80cf54…

41: PHASE SIGMA_OLD % 3 8 4 18 !
42: CONST SIGMA_OLD : FE : V : FE V : !

FeV-91Hua-LB.tdb: SIGMA_OLD, type code %, sha256 879c739fcb81e871…

50: PHASE SIGMA_OLD % 3 8 4 18 !
51: CONST SIGMA_OLD : FE : V : FE V : !

Example references (3 of 3; assessments first):

doi:10.1016/0364-5916(83)90010-X J.-O. Andersson, Calphad, 7, 305-15(1983).
assessment that models this phase
doi:10.1016/0364-5916(91)90008-8 K.C. Hari Kumar, V. Raghavan, A thermodynamic reassessment of the FE-V system, Calphad 15, 307-314 (1991).
assessment that models this phase
doi:10.1515/ijmr-1991-820510 W. Huang, Z. Metallkd., 82, 391-401(1991).
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). doi: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). doi: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.

@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}
}