Co–V phases

11 phases (tier A 6, tier C 1, liquid 1, needs_review 3); 10 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 · Co–V system page · Markdown · field reference

Phases of the Co–V system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:co-v:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 6 of 6 calculated diagram(s): 300–3999.25 K, x(V) 0.76515–1	21	6
CO3V phase:co-v:co3v	Al3Pu · hP24 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 5 of 5 calculated diagram(s): 300–1344.31 K, x(V) 0.20409–0.31349	27	5
COV3_A15 phase:co-v:cov3-a15	Cr3Si · A15 · cP8 · Pm-3n (223)	tier A: standard phase name	stable in 6 of 6 calculated diagram(s): 300–1360 K, x(V) 0.75–0.75454	11	6
SIGMA_D8B phase:co-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): 300–1696.17 K, x(V) 0.41698–0.7184	31	4
DIS_SIGMA phase:co-v:dis-sigma		needs_review	not stable in 1 calculated diagram(s)	0	1
FCC_4SL phase:co-v:fcc-4sl		needs_review	stable in 3 of 3 calculated diagram(s): 666.36–1767.99 K, x(V) 0–0.36312	0	3
FCC_A1 phase:co-v:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 6 of 6 calculated diagram(s): 300–1773.19 K, x(V) 0–0.36305	25	9
HCP_4SL phase:co-v:hcp-4sl		needs_review	stable in 1 of 1 calculated diagram(s): 300–1382.79 K, x(V) 0–0.26268	3	1
HCP_A3 phase:co-v:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 6 of 6 calculated diagram(s): 300–735.7 K, x(V) 0–0.03153	2	7
LIQUID phase:co-v:liquid	liquid	liquid	stable in 6 of 6 calculated diagram(s): 1510–4000 K, x(V) 0–1	12	6
SIGMA_OLD phase:co-v:old-sigma	sigma-CrFe · D8_b · tP30 · P4_2/mnm (136)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1694.72 K, x(V) 0.41422–0.70731	18	2

BCC_A2 (Co–V)

Id: phase:co-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 6 of 6 calculated diagram(s): 300–3999.25 K, x(V) 0.76515–1
Literature: 21 values (21 accepted) from 3 papers
Interactive: phase registry entry

Names (11): corpus: corpus:phase:co-v:bcc-a2
paper: paper:10.1016/j.jallcom.2004.04.131:bcc, paper:10.1016/j.matchemphys.2015.06.028:(V), paper:10.1361/105497103772084534:(V), paper:10.1361/105497103772084534:bcc
tdb: tdb:CoV-03Bra-LB.tdb:BCC_A2, tdb:CoV-04Hua.tdb:BCC_A2, tdb:CoV-15Wan.tdb:BCC_A2, tdb:CoV-20Wan-mod.tdb:BCC_A2, tdb:CoV-20Wan.tdb:BCC_A2, tdb:CoV-24Sun.tdb:BCC_A2

TDB models of BCC_A2 (6): PHASE and CONSTITUENT statements as written

CoV-03Bra-LB.tdb: BCC_A2, type code %B, sha256 9989e5b98aef44c6…

53: PHASE BCC_A2 %B 2 1 3 !
54: CONST BCC_A2 : CO V% : VA : !

CoV-04Hua.tdb: BCC_A2, type code %B, sha256 dd5238a73f44104a…

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

CoV-15Wan.tdb: BCC_A2, type code %B, sha256 806d7a1de1b823d0…

34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : CO V% : VA : !

CoV-20Wan-mod.tdb: BCC_A2, type code %B, sha256 80e65f032fcdd04e…

68: PHASE BCC_A2 %B 2 1 3 !
69: CONST BCC_A2 : CO V% : VA : !

CoV-20Wan.tdb: BCC_A2, type code %B, sha256 37a72b9c68686fd9…

49: PHASE BCC_A2 %B 2 1 3 !
50: CONST BCC_A2 : CO V% : VA : !

CoV-24Sun.tdb: BCC_A2, type code %B, sha256 df9c23b303bbb880…

40: PHASE BCC_A2 %B 2 1 3 !
41: CONST BCC_A2 : CO V% : VA : !

Example references (6 of 6; assessments first):

doi:10.1361/105497103772084534 Johan Bratberg, Bo Sundman, A thermodynamic assessment of the Co-V system, JPE 24, 495-503 (2003).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2004.04.131 Shuigen Huang, Lin Li, Omer Van der Biest, Jef Vleugels, Thermodynamic assessment of the Co–V and Co–V–C system, Journal of Alloys and Compounds 385, 114-118 (2004).
assessment that models this phase; reports values for this phase
doi:10.1016/j.matchemphys.2015.06.028 Cuiping Wang, Cancan Zhao, Yong Lu, Tian Li, Dongliang Peng, Ji Shi et al., Experimental observation of magnetically induced phase separation and thermodynamic assessment in the Co–V binary system, Materials Chemistry and Physics 162, 555-560 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101729 Peisheng Wang, Thomas Hammerschmidt, Ursula R. Kattner, Gregory B. Olson, Structural stability of Co–V intermetallic phases and thermodynamic description of the Co–V system, Calphad 68, 101729 (2020).
assessment that models this phase
doi:10.1016/j.calphad.2024.102762 J. Sun, C. Guo, C. Li, Z. Du, Calphad, 87, 102762(2024).
assessment that models this phase
doi:10.1016/0021-9614(76)90028-8 P.J. Spencer, F.H. Putland, A calorimetric study of the cobalt + vanadium system, The Journal of Chemical Thermodynamics 8, 551-556 (1976).
cited as the source of values for this phase

CO3V (Co–V)

Id: phase:co-v:co3v; status assigned
Structure: Al3Pu · hP24 · P6_3/mmc (194); type st:al3pu-hp24; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 5 of 5 calculated diagram(s): 300–1344.31 K, x(V) 0.20409–0.31349
Literature: 27 values (27 accepted) from 3 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:co-v:co3v
paper: paper:10.1016/j.calphad.2019.101729:Co3V, paper:10.1016/j.jallcom.2004.04.131:Co3M, paper:10.1016/j.matchemphys.2015.06.028:Co3V
tdb: tdb:CoV-04Hua.tdb:CO3V, tdb:CoV-15Wan.tdb:CO3V, tdb:CoV-20Wan-mod.tdb:CO3V, tdb:CoV-20Wan.tdb:CO3V, tdb:CoV-24Sun.tdb:CO3V

TDB models of CO3V (5): PHASE and CONSTITUENT statements as written

CoV-04Hua.tdb: CO3V, type code %, sha256 dd5238a73f44104a…

45: PHASE CO3V % 2 3 1 !
46: CONST CO3V : CO : V : !

CoV-15Wan.tdb: CO3V, type code %, sha256 806d7a1de1b823d0…

44: PHASE CO3V % 2 3 1 !
45: CONST CO3V : CO% V : CO V% : !

CoV-20Wan-mod.tdb: CO3V, type code %, sha256 80e65f032fcdd04e…

78: PHASE CO3V % 2 3 1 !
79: CONST CO3V : CO% V : CO V% : !

CoV-20Wan.tdb: CO3V, type code %, sha256 37a72b9c68686fd9…

59: PHASE CO3V % 2 3 1 !
60: CONST CO3V : CO% V : CO V% : !

CoV-24Sun.tdb: CO3V, type code %, sha256 df9c23b303bbb880…

50: PHASE CO3V % 2 3 1 !
51: CONST CO3V : CO% V : CO V% : !

Example references (5 of 5; assessments first):

doi:10.1016/j.calphad.2019.101729 Peisheng Wang, Thomas Hammerschmidt, Ursula R. Kattner, Gregory B. Olson, Structural stability of Co–V intermetallic phases and thermodynamic description of the Co–V system, Calphad 68, 101729 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/j.matchemphys.2015.06.028 Cuiping Wang, Cancan Zhao, Yong Lu, Tian Li, Dongliang Peng, Ji Shi et al., Experimental observation of magnetically induced phase separation and thermodynamic assessment in the Co–V binary system, Materials Chemistry and Physics 162, 555-560 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2004.04.131 Shuigen Huang, Lin Li, Omer Van der Biest, Jef Vleugels, Thermodynamic assessment of the Co–V and Co–V–C system, Journal of Alloys and Compounds 385, 114-118 (2004).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2024.102762 J. Sun, C. Guo, C. Li, Z. Du, Calphad, 87, 102762(2024).
assessment that models this phase
doi:10.1515/ijmr-1955-460307 W. Köster, H. Schmid, Z. Metallkde 46 (1955) 195–197.
cited as the source of values for this phase

COV3_A15 (Co–V)

Id: phase:co-v:cov3-a15; status assigned
Structure: Cr3Si · A15 · cP8 · Pm-3n (223); type st:a15-cr3si-cp8; tier A: standard phase name; confidence high
Stability: stable in 6 of 6 calculated diagram(s): 300–1360 K, x(V) 0.75–0.75454
Literature: 11 values (11 accepted) from 4 papers
Interactive: phase registry entry

Names (11): corpus: corpus:phase:co-v:cov3-a15
paper: paper:10.1016/j.calphad.2019.101729:CoV3, paper:10.1016/j.jallcom.2004.04.131:CoM3, paper:10.1016/j.matchemphys.2015.06.028:CoV3, paper:10.1361/105497103772084534:CoV3
tdb: tdb:CoV-03Bra-LB.tdb:COV3_A15, tdb:CoV-04Hua.tdb:COV3_A15, tdb:CoV-15Wan.tdb:COV3_A15, tdb:CoV-20Wan-mod.tdb:COV3_A15, tdb:CoV-20Wan.tdb:COV3_A15, tdb:CoV-24Sun.tdb:COV3_A15

TDB models of COV3_A15 (6): PHASE and CONSTITUENT statements as written

CoV-03Bra-LB.tdb: COV3_A15, type code %, sha256 9989e5b98aef44c6…

80: PHASE COV3_A15 % 2 1 3 !
81: CONST COV3_A15 : CO : V : !

CoV-04Hua.tdb: COV3_A15, type code %, sha256 dd5238a73f44104a…

55: PHASE COV3_A15 % 2 1 3 !
56: CONST COV3_A15 : CO : V : !

CoV-15Wan.tdb: COV3_A15, type code %, sha256 806d7a1de1b823d0…

54: PHASE COV3_A15 % 2 1 3 !
55: CONST COV3_A15 : CO : V : !

CoV-20Wan-mod.tdb: COV3_A15, type code %, sha256 80e65f032fcdd04e…

96: PHASE COV3_A15 % 2 1 3 !
97: CONST COV3_A15 : CO% V : V : !

CoV-20Wan.tdb: COV3_A15, type code %, sha256 37a72b9c68686fd9…

74: PHASE COV3_A15 % 2 1 3 !
75: CONST COV3_A15 : CO : V : !

CoV-24Sun.tdb: COV3_A15, type code %, sha256 df9c23b303bbb880…

60: PHASE COV3_A15 % 2 1 3 !
61: CONST COV3_A15 : CO : V : !

Example references (5 of 5; assessments first):

doi:10.1016/j.calphad.2019.101729 Peisheng Wang, Thomas Hammerschmidt, Ursula R. Kattner, Gregory B. Olson, Structural stability of Co–V intermetallic phases and thermodynamic description of the Co–V system, Calphad 68, 101729 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/j.matchemphys.2015.06.028 Cuiping Wang, Cancan Zhao, Yong Lu, Tian Li, Dongliang Peng, Ji Shi et al., Experimental observation of magnetically induced phase separation and thermodynamic assessment in the Co–V binary system, Materials Chemistry and Physics 162, 555-560 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2004.04.131 Shuigen Huang, Lin Li, Omer Van der Biest, Jef Vleugels, Thermodynamic assessment of the Co–V and Co–V–C system, Journal of Alloys and Compounds 385, 114-118 (2004).
assessment that models this phase; reports values for this phase
doi:10.1361/105497103772084534 Johan Bratberg, Bo Sundman, A thermodynamic assessment of the Co-V system, JPE 24, 495-503 (2003).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2024.102762 J. Sun, C. Guo, C. Li, Z. Du, Calphad, 87, 102762(2024).
assessment that models this phase

SIGMA_D8B (Co–V)

Id: phase:co-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 CoV-03Bra-LB.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoV-20Wan-mod.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoV-20Wan.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoV-24Sun.tdb also describes the disordered state
Stability: stable in 4 of 4 calculated diagram(s): 300–1696.17 K, x(V) 0.41698–0.7184
Literature: 31 values (31 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:co-v:d8b-sigma, corpus:phase:co-v:sigma-d8b
paper: paper:10.1016/j.calphad.2019.101729:σ, paper:10.1361/105497103772084534:σ
tdb: tdb:CoV-03Bra-LB.tdb:SIGMA_D8B, tdb:CoV-20Wan-mod.tdb:SIGMA_D8B, tdb:CoV-20Wan.tdb:SIGMA_D8B, tdb:CoV-24Sun.tdb:SIGMA_D8B

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

CoV-03Bra-LB.tdb: SIGMA_D8B, type code %, sha256 9989e5b98aef44c6…

75: PHASE SIGMA_D8B % 3 10 4 16 !
76: CONST SIGMA_D8B : CO V : V : CO V : !

CoV-20Wan-mod.tdb: SIGMA_D8B, type code %, sha256 80e65f032fcdd04e…

91: PHASE SIGMA_D8B % 3 10 4 16 !
92: CONST SIGMA_D8B : CO V : V : CO V : !

CoV-20Wan.tdb: SIGMA_D8B, type code %AP, sha256 37a72b9c68686fd9…

69: PHASE SIGMA_D8B %AP 3 10 4 16 !
70: CONST SIGMA_D8B : CO V : CO V : CO V : !

CoV-24Sun.tdb: SIGMA_D8B, type code %, sha256 df9c23b303bbb880…

55: PHASE SIGMA_D8B % 2 10 20 !
56: CONST SIGMA_D8B : CO% V : CO V% : !

Example references (4 of 4; assessments first):

doi:10.1361/105497103772084534 Johan Bratberg, Bo Sundman, A thermodynamic assessment of the Co-V system, JPE 24, 495-503 (2003).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101729 Peisheng Wang, Thomas Hammerschmidt, Ursula R. Kattner, Gregory B. Olson, Structural stability of Co–V intermetallic phases and thermodynamic description of the Co–V system, Calphad 68, 101729 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2024.102762 J. Sun, C. Guo, C. Li, Z. Du, Calphad, 87, 102762(2024).
assessment that models this phase
doi:10.1016/0021-9614(76)90028-8 P.J. Spencer, F.H. Putland, A calorimetric study of the cobalt + vanadium system, The Journal of Chemical Thermodynamics 8, 551-556 (1976).
cited as the source of values for this phase

DIS_SIGMA (Co–V)

Id: phase:co-v:dis-sigma; status needs_review
No structure assigned. Why: unrecognised_name_tokens:DIS
Candidate (name_token): sigma-CrFe · D8_b · tP30 · P4_2/mnm (136) — Strukturbericht/word 'D8B' in the TDB name
Stability: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-v:dis-sigma
tdb: tdb:CoV-20Wan.tdb:DIS_SIGMA

TDB models of DIS_SIGMA (1): PHASE and CONSTITUENT statements as written

CoV-20Wan.tdb: DIS_SIGMA, type code %A, sha256 37a72b9c68686fd9…

64: PHASE DIS_SIGMA %A 1 1 !
65: CONST DIS_SIGMA : CO V : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2019.101729 Peisheng Wang, Thomas Hammerschmidt, Ursula R. Kattner, Gregory B. Olson, Structural stability of Co–V intermetallic phases and thermodynamic description of the Co–V system, Calphad 68, 101729 (2020).
assessment that models this phase

FCC_4SL (Co–V)

Id: phase:co-v:fcc-4sl; status needs_review
No structure assigned. Why: order_disorder_ambiguity:CoV-03Bra-LB.tdb_model_is_partitioned; order_disorder_ambiguity:CoV-20Wan-mod.tdb_model_is_partitioned; order_disorder_ambiguity:CoV-20Wan.tdb_model_is_partitioned; unrecognised_name_tokens:4SL
Candidate (dft_mp): P6_3/mmc (194) — on-hull MP VCo3 at x(V)=0.2500
Candidate (dft_oqmd): P63/mmc (194) — on-hull OQMD Co3 V1 at x(V)=0.2500
Candidate (name_token): Cu · A1 · cF4 · Fm-3m (225) — Strukturbericht/word 'A1' in the TDB name
Candidate (tdb_comment): AuCu3 · cP4 · Pm-3m, L1_2 — CoV-03Bra-LB.tdb: 'Prototype AuCu3 (cP4, Pm-3m, L1_2) and AuCu (tP4, P4/mmm, L1_0)'
Candidate (tdb_comment): AuCu3 · cP4 · Pm-3m, L1_2 — CoV-20Wan-mod.tdb: 'Prototype AuCu3 (cP4, Pm-3m, L1_2) and AuCu (tP4, P4/mmm, L1_0)'
Candidate (tdb_comment): AuCu3 · cP4 · Pm-3m, L1_2 — CoV-20Wan.tdb: 'Prototype AuCu3 (cP4, Pm-3m, L1_2) and AuCu (tP4, P4/mmm, L1_0)'
Stability: stable in 3 of 3 calculated diagram(s): 666.36–1767.99 K, x(V) 0–0.36312
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:co-v:fcc-4sl
tdb: tdb:CoV-03Bra-LB.tdb:FCC_4SL, tdb:CoV-20Wan-mod.tdb:FCC_4SL, tdb:CoV-20Wan.tdb:FCC_4SL

TDB models of FCC_4SL (3): PHASE and CONSTITUENT statements as written

CoV-03Bra-LB.tdb: FCC_4SL, type code %AY, sha256 9989e5b98aef44c6…

48: PHASE FCC_4SL %AY 5 0.25 0.25 0.25 0.25 1 !
49: CONST FCC_4SL : CO V : CO V : CO V : CO V : VA : !

CoV-20Wan-mod.tdb: FCC_4SL, type code %AY, sha256 80e65f032fcdd04e…

63: PHASE FCC_4SL:F %AY 5 0.25 0.25 0.25 0.25 1 !
64: CONST FCC_4SL:F : CO V : CO V : CO V : CO V : VA : !

CoV-20Wan.tdb: FCC_4SL, type code %AY, sha256 37a72b9c68686fd9…

44: PHASE FCC_4SL:F %AY 5 0.25 0.25 0.25 0.25 1 !
45: CONST FCC_4SL:F : CO V : CO V : CO V : CO V : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2019.101729 Peisheng Wang, Thomas Hammerschmidt, Ursula R. Kattner, Gregory B. Olson, Structural stability of Co–V intermetallic phases and thermodynamic description of the Co–V system, Calphad 68, 101729 (2020).
assessment that models this phase
doi:10.1361/105497103772084534 Johan Bratberg, Bo Sundman, A thermodynamic assessment of the Co-V system, JPE 24, 495-503 (2003).
assessment that models this phase

FCC_A1 (Co–V)

Id: phase:co-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 6 of 6 calculated diagram(s): 300–1773.19 K, x(V) 0–0.36305
Literature: 25 values (25 accepted) from 2 papers
Interactive: phase registry entry

Names (14): corpus: corpus:phase:co-v:fcc-a1, corpus:phase:co-v:fcc-a1-2
paper: paper:10.1016/j.jallcom.2004.04.131:fcc, paper:10.1361/105497103772084534:(Co3V(fcc), paper:10.1361/105497103772084534:fcc
tdb: tdb:CoV-03Bra-LB.tdb:A1_FCC, tdb:CoV-03Bra-LB.tdb:FCC_A1, tdb:CoV-04Hua.tdb:FCC_A1, tdb:CoV-15Wan.tdb:FCC_A1, tdb:CoV-20Wan-mod.tdb:A1_FCC, tdb:CoV-20Wan-mod.tdb:FCC_A1, tdb:CoV-20Wan.tdb:A1_FCC, tdb:CoV-20Wan.tdb:FCC_A1, tdb:CoV-24Sun.tdb:FCC_A1

TDB models of FCC_A1 (9): PHASE and CONSTITUENT statements as written

CoV-03Bra-LB.tdb: A1_FCC, type code %A, sha256 9989e5b98aef44c6…

43: PHASE A1_FCC %A 2 1 1 !
44: CONST A1_FCC : CO% V : VA : !

CoV-03Bra-LB.tdb: FCC_A1, type code %A, sha256 9989e5b98aef44c6…

38: PHASE FCC_A1 %A 2 1 1 !
39: CONST FCC_A1 : CO% V : VA : !

CoV-04Hua.tdb: FCC_A1, type code %A, sha256 dd5238a73f44104a…

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

CoV-15Wan.tdb: FCC_A1, type code %A, sha256 806d7a1de1b823d0…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : CO% V : VA : !

CoV-20Wan-mod.tdb: A1_FCC, type code %A, sha256 80e65f032fcdd04e…

58: PHASE A1_FCC %A 2 1 1 !
59: CONST A1_FCC : CO% V : VA : !

CoV-20Wan-mod.tdb: FCC_A1, type code %A, sha256 80e65f032fcdd04e…

53: PHASE FCC_A1 %A 2 1 1 !
54: CONST FCC_A1 : CO% V : VA : !

CoV-20Wan.tdb: A1_FCC, type code %A, sha256 37a72b9c68686fd9…

39: PHASE A1_FCC %A 2 1 1 !
40: CONST A1_FCC : CO% V : VA : !

CoV-20Wan.tdb: FCC_A1, type code %A, sha256 37a72b9c68686fd9…

34: PHASE FCC_A1 %A 2 1 1 !
35: CONST FCC_A1 : CO% V : VA : !

CoV-24Sun.tdb: FCC_A1, type code %A, sha256 df9c23b303bbb880…

35: PHASE FCC_A1 %A 2 1 1 !
36: CONST FCC_A1 : CO% V : VA : !

Example references (7 of 7; assessments first):

doi:10.1361/105497103772084534 Johan Bratberg, Bo Sundman, A thermodynamic assessment of the Co-V system, JPE 24, 495-503 (2003).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2004.04.131 Shuigen Huang, Lin Li, Omer Van der Biest, Jef Vleugels, Thermodynamic assessment of the Co–V and Co–V–C system, Journal of Alloys and Compounds 385, 114-118 (2004).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101729 Peisheng Wang, Thomas Hammerschmidt, Ursula R. Kattner, Gregory B. Olson, Structural stability of Co–V intermetallic phases and thermodynamic description of the Co–V system, Calphad 68, 101729 (2020).
assessment that models this phase
doi:10.1016/j.calphad.2024.102762 J. Sun, C. Guo, C. Li, Z. Du, Calphad, 87, 102762(2024).
assessment that models this phase
doi:10.1016/j.matchemphys.2015.06.028 Cuiping Wang, Cancan Zhao, Yong Lu, Tian Li, Dongliang Peng, Ji Shi et al., Experimental observation of magnetically induced phase separation and thermodynamic assessment in the Co–V binary system, Materials Chemistry and Physics 162, 555-560 (2015).
assessment that models this phase
doi:10.1016/0021-9614(76)90028-8 P.J. Spencer, F.H. Putland, A calorimetric study of the cobalt + vanadium system, The Journal of Chemical Thermodynamics 8, 551-556 (1976).
cited as the source of values for this phase
doi:10.1515/ijmr-1955-460307 W. Köster, H. Schmid, Z. Metallkde 46 (1955) 195–197.
cited as the source of values for this phase

HCP_4SL (Co–V)

Id: phase:co-v:hcp-4sl; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:order_disorder_ambiguity; order_disorder_ambiguity:CoV-03Bra-LB.tdb_model_is_partitioned; unrecognised_name_tokens:4SL
Candidate (dft_mp): P6_3/mmc (194) — on-hull MP VCo3 at x(V)=0.2500
Candidate (dft_oqmd): P63/mmc (194) — on-hull OQMD Co3 V1 at x(V)=0.2500
Candidate (literature_printed): Al3Pu · hP24 — printed with a label mapped to this phase
Candidate (name_token): Mg · A3 · hP2 · P6_3/mmc (194) — Strukturbericht/word 'A3' in the TDB name
Candidate (sgte_mmc2): Al3Pu · hP24 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for HCP_4SL: Co3V
Candidate (tdb_comment): AuCd · B19 · oP4 — CoV-03Bra-LB.tdb: 'Prototype AuCd (B19, oP4) and CdMg3 (D0_19, hP8, P6_3/mmc)'
Stability: stable in 1 of 1 calculated diagram(s): 300–1382.79 K, x(V) 0–0.26268
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-v:hcp-4sl
paper: paper:10.1361/105497103772084534:Co3V, paper:10.1361/105497103772084534:Co3V (fcc), paper:10.1361/105497103772084534:Co3V (hex)
tdb: tdb:CoV-03Bra-LB.tdb:HCP_4SL

TDB models of HCP_4SL (1): PHASE and CONSTITUENT statements as written

CoV-03Bra-LB.tdb: HCP_4SL, type code %AX, sha256 9989e5b98aef44c6…

70: PHASE HCP_4SL %AX 5 0.25 0.25 0.25 0.25 0.5 !
71: CONST HCP_4SL : CO V : CO V : CO V : CO V : VA : !

Example references (1 of 1; assessments first):

doi:10.1361/105497103772084534 Johan Bratberg, Bo Sundman, A thermodynamic assessment of the Co-V system, JPE 24, 495-503 (2003).
assessment that models this phase; reports values for this phase

HCP_A3 (Co–V)

Id: phase:co-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: stable in 6 of 6 calculated diagram(s): 300–735.7 K, x(V) 0–0.03153
Literature: 2 values (2 accepted) from 2 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:co-v:hcp-a3
paper: paper:10.1016/j.matchemphys.2015.06.028:(εCo), paper:10.1361/105497103772084534:(εCo)
tdb: tdb:CoV-03Bra-LB.tdb:A3_HCP, tdb:CoV-03Bra-LB.tdb:HCP_A3, tdb:CoV-04Hua.tdb:HCP_A3, tdb:CoV-15Wan.tdb:HCP_A3, tdb:CoV-20Wan-mod.tdb:HCP_A3, tdb:CoV-20Wan.tdb:HCP_A3, tdb:CoV-24Sun.tdb:HCP_A3

TDB models of HCP_A3 (7): PHASE and CONSTITUENT statements as written

CoV-03Bra-LB.tdb: A3_HCP, type code %A, sha256 9989e5b98aef44c6…

63: PHASE A3_HCP %A 2 1 0.5 !
64: CONST A3_HCP : CO% V : VA : !

CoV-03Bra-LB.tdb: HCP_A3, type code %A, sha256 9989e5b98aef44c6…

58: PHASE HCP_A3 %A 2 1 0.5 !
59: CONST HCP_A3 : CO% V : VA : !

CoV-04Hua.tdb: HCP_A3, type code %A, sha256 dd5238a73f44104a…

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

CoV-15Wan.tdb: HCP_A3, type code %A, sha256 806d7a1de1b823d0…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : CO% V : VA : !

CoV-20Wan-mod.tdb: HCP_A3, type code %A, sha256 80e65f032fcdd04e…

73: PHASE HCP_A3 %A 2 1 0.5 !
74: CONST HCP_A3 : CO% V : VA : !

CoV-20Wan.tdb: HCP_A3, type code %A, sha256 37a72b9c68686fd9…

54: PHASE HCP_A3 %A 2 1 0.5 !
55: CONST HCP_A3 : CO% V : VA : !

CoV-24Sun.tdb: HCP_A3, type code %A, sha256 df9c23b303bbb880…

45: PHASE HCP_A3 %A 2 1 0.5 !
46: CONST HCP_A3 : CO% V : VA : !

Example references (5 of 5; assessments first):

doi:10.1016/j.matchemphys.2015.06.028 Cuiping Wang, Cancan Zhao, Yong Lu, Tian Li, Dongliang Peng, Ji Shi et al., Experimental observation of magnetically induced phase separation and thermodynamic assessment in the Co–V binary system, Materials Chemistry and Physics 162, 555-560 (2015).
assessment that models this phase; reports values for this phase
doi:10.1361/105497103772084534 Johan Bratberg, Bo Sundman, A thermodynamic assessment of the Co-V system, JPE 24, 495-503 (2003).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101729 Peisheng Wang, Thomas Hammerschmidt, Ursula R. Kattner, Gregory B. Olson, Structural stability of Co–V intermetallic phases and thermodynamic description of the Co–V system, Calphad 68, 101729 (2020).
assessment that models this phase
doi:10.1016/j.calphad.2024.102762 J. Sun, C. Guo, C. Li, Z. Du, Calphad, 87, 102762(2024).
assessment that models this phase
doi:10.1016/j.jallcom.2004.04.131 Shuigen Huang, Lin Li, Omer Van der Biest, Jef Vleugels, Thermodynamic assessment of the Co–V and Co–V–C system, Journal of Alloys and Compounds 385, 114-118 (2004).
assessment that models this phase

LIQUID (Co–V)

Id: phase:co-v:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 6 of 6 calculated diagram(s): 1510–4000 K, x(V) 0–1
Literature: 12 values (12 accepted) from 3 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:co-v:liquid
paper: paper:10.1016/j.jallcom.2004.04.131:L, paper:10.1016/j.matchemphys.2015.06.028:L, paper:10.1361/105497103772084534:L
tdb: tdb:CoV-03Bra-LB.tdb:LIQUID, tdb:CoV-04Hua.tdb:LIQUID, tdb:CoV-15Wan.tdb:LIQUID, tdb:CoV-20Wan-mod.tdb:LIQUID, tdb:CoV-20Wan.tdb:LIQUID, tdb:CoV-24Sun.tdb:LIQUID

TDB models of LIQUID (6): PHASE and CONSTITUENT statements as written

CoV-03Bra-LB.tdb: LIQUID, type code %, sha256 9989e5b98aef44c6…

33: PHASE LIQUID:L % 1 1 !
34: CONST LIQUID:L : CO V : !

CoV-04Hua.tdb: LIQUID, type code %, sha256 dd5238a73f44104a…

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

CoV-15Wan.tdb: LIQUID, type code %, sha256 806d7a1de1b823d0…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : CO V : !

CoV-20Wan-mod.tdb: LIQUID, type code %, sha256 80e65f032fcdd04e…

48: PHASE LIQUID:L % 1 1 !
49: CONST LIQUID:L : CO V : !

CoV-20Wan.tdb: LIQUID, type code %, sha256 37a72b9c68686fd9…

29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : CO V : !

CoV-24Sun.tdb: LIQUID, type code %, sha256 df9c23b303bbb880…

30: PHASE LIQUID:L % 1 1 !
31: CONST LIQUID:L : CO V : !

Example references (6 of 6; assessments first):

doi:10.1016/j.jallcom.2004.04.131 Shuigen Huang, Lin Li, Omer Van der Biest, Jef Vleugels, Thermodynamic assessment of the Co–V and Co–V–C system, Journal of Alloys and Compounds 385, 114-118 (2004).
assessment that models this phase; reports values for this phase
doi:10.1016/j.matchemphys.2015.06.028 Cuiping Wang, Cancan Zhao, Yong Lu, Tian Li, Dongliang Peng, Ji Shi et al., Experimental observation of magnetically induced phase separation and thermodynamic assessment in the Co–V binary system, Materials Chemistry and Physics 162, 555-560 (2015).
assessment that models this phase; reports values for this phase
doi:10.1361/105497103772084534 Johan Bratberg, Bo Sundman, A thermodynamic assessment of the Co-V system, JPE 24, 495-503 (2003).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101729 Peisheng Wang, Thomas Hammerschmidt, Ursula R. Kattner, Gregory B. Olson, Structural stability of Co–V intermetallic phases and thermodynamic description of the Co–V system, Calphad 68, 101729 (2020).
assessment that models this phase
doi:10.1016/j.calphad.2024.102762 J. Sun, C. Guo, C. Li, Z. Du, Calphad, 87, 102762(2024).
assessment that models this phase
doi:10.1515/ijmr-1955-460307 W. Köster, H. Schmid, Z. Metallkde 46 (1955) 195–197.
cited as the source of values for this phase

SIGMA_OLD (Co–V)

Id: phase:co-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 2 calculated diagram(s): 300–1694.72 K, x(V) 0.41422–0.70731
Literature: 18 values (18 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:co-v:old-sigma, corpus:phase:co-v:sigma-old
paper: paper:10.1016/j.jallcom.2004.04.131:Sigma, paper:10.1016/j.jallcom.2004.04.131:sigma, paper:10.1016/j.matchemphys.2015.06.028:σ
tdb: tdb:CoV-04Hua.tdb:SIGMA_OLD, tdb:CoV-15Wan.tdb:SIGMA_OLD

TDB models of SIGMA_OLD (2): PHASE and CONSTITUENT statements as written

CoV-04Hua.tdb: SIGMA_OLD, type code %, sha256 dd5238a73f44104a…

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

CoV-15Wan.tdb: SIGMA_OLD, type code %, sha256 806d7a1de1b823d0…

49: PHASE SIGMA_OLD % 3 8 4 18 !
50: CONST SIGMA_OLD : CO : V : CO V : !

Example references (3 of 3; assessments first):

doi:10.1016/j.matchemphys.2015.06.028 Cuiping Wang, Cancan Zhao, Yong Lu, Tian Li, Dongliang Peng, Ji Shi et al., Experimental observation of magnetically induced phase separation and thermodynamic assessment in the Co–V binary system, Materials Chemistry and Physics 162, 555-560 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2004.04.131 Shuigen Huang, Lin Li, Omer Van der Biest, Jef Vleugels, Thermodynamic assessment of the Co–V and Co–V–C system, Journal of Alloys and Compounds 385, 114-118 (2004).
assessment that models this phase; reports values for this phase
doi:10.1515/ijmr-1955-460307 W. Köster, H. Schmid, Z. Metallkde 46 (1955) 195–197.
cited as the source of values for 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}
}