Co–Nb phases

11 phases (tier A 7, liquid 1, needs_review 3); 11 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–Nb system page · Markdown · field reference

Phases of the Co–Nb system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:co-nb:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–3999.98 K, x(Nb) 0.94182–1	12	4
C14_LAVES phase:co-nb:c14-laves	MgZn2 · C14 · hP12 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 1511.5–1696.9 K, x(Nb) 0.3583–0.37375	26	3
C15_LAVES phase:co-nb:c15-laves	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–1756.47 K, x(Nb) 0.25058–0.35362	59	4
C36_LAVES phase:co-nb:c36-laves	MgNi2 · C36 · hP24 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 1302.19–1537.36 K, x(Nb) 0.23704–0.25743	32	3
CO16NB9_C14 phase:co-nb:co16nb9-c14		needs_review	stable in 1 of 1 calculated diagram(s): 1460–1700.54 K, x(Nb) 0.36–0.36	9	1
CO3NB_C36 phase:co-nb:co3nb-c36		needs_review	stable in 1 of 1 calculated diagram(s): 1277.93–1521.8 K, x(Nb) 0.25–0.25	12	1
CO7NB2 phase:co-nb:co7nb2		needs_review	stable in 4 of 4 calculated diagram(s): 300–1359.48 K, x(Nb) 0.22222–0.22222	23	4
MU_D85 phase:co-nb:d85-mu	Fe7W6 · D8_5 · hR13 · R-3m (166)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–1708.54 K, x(Nb) 0.45992–0.56446	48	4
FCC_A1 phase:co-nb:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 688.19–1768.99 K, x(Nb) 0–0.05372	27	4
HCP_A3 phase:co-nb:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–819.19 K, x(Nb) 0–7e-05	3	4
LIQUID phase:co-nb:liquid	liquid	liquid	stable in 4 of 4 calculated diagram(s): 1503.83–4000 K, x(Nb) 0–1	90	4

BCC_A2 (Co–Nb)

Id: phase:co-nb: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 4 of 4 calculated diagram(s): 300–3999.98 K, x(Nb) 0.94182–1
Literature: 12 values (12 accepted) from 3 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:co-nb:bcc-a2
paper: paper:10.1007/s11661-020-05963-2:bcc(Nb), paper:10.1016/j.jallcom.2015.02.182:(Nb), paper:10.1016/s0925-8388(97)00465-9:bcc
tdb: tdb:CoNb-15He.tdb:BCC_A2, tdb:CoNb-20Zho.tdb:BCC_A2, tdb:CoNb-22Wei.tdb:BCC_A2, tdb:CoNb-98Har-LB.tdb:BCC_A2

TDB models of BCC_A2 (4): PHASE and CONSTITUENT statements as written

CoNb-15He.tdb: BCC_A2, type code %B, sha256 870ac3d5afa50fc9…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : CO NB% : VA : !

CoNb-20Zho.tdb: BCC_A2, type code %B, sha256 9a76c67c6bba1992…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : CO NB% : VA : !

CoNb-22Wei.tdb: BCC_A2, type code %B, sha256 9d02f9031327c346…

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

CoNb-98Har-LB.tdb: BCC_A2, type code %B, sha256 0243c89a99fdd870…

31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : CO NB% : VA : !

Example references (5 of 5; assessments first):

doi:10.1016/j.jallcom.2015.02.182 Cuiyun He, Frank Stein, Martin Palm, Thermodynamic description of the systems Co–Nb, Al–Nb and Co–Al–Nb, Journal of Alloys and Compounds 637, 361-375 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00465-9 K.C. Hari Kumar, I. Ansara, P. Wollants, L. Delaye, J. Alloys Compd., 267, 105-12(1998).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1007/s11661-020-05963-2 Chenyang Zhou, Cuiping Guo, Jingbo Li, Changrong Li, Zhenmin Du, Key Experiments and Thermodynamic Description of the Co-Nb-Ni System, Metall Mater Trans A 51, 5892-5911 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2022.166516 Dawei Wei, Xiaofeng Bai, Cuiping Guo, Changrong Li, Zhenmin Du, Experimental investigation and thermodynamic description of the Co–Nb–Ti system, Journal of Alloys and Compounds 924, 166516 (2022).
assessment that models this phase
doi:10.1016/0022-5088(67)90004-5 J.K. Pargeter, W. Hume-Rothery, The constitution of niobium-cobalt alloys, Journal of the Less Common Metals 12, 366-374 (1967).
cited as the source of values for this phase

C14_LAVES (Co–Nb)

Id: phase:co-nb: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 CoNb-15He.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoNb-20Zho.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoNb-22Wei.tdb also describes the disordered state
Stability: stable in 3 of 3 calculated diagram(s): 1511.5–1696.9 K, x(Nb) 0.3583–0.37375
Literature: 26 values (26 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:co-nb:c14-laves
paper: paper:10.1007/s11661-020-05963-2:λ1, paper:10.1016/j.jallcom.2015.02.182:C14
tdb: tdb:CoNb-15He.tdb:C14_LAVES, tdb:CoNb-20Zho.tdb:C14_LAVES, tdb:CoNb-22Wei.tdb:C14_LAVES

TDB models of C14_LAVES (3): PHASE and CONSTITUENT statements as written

CoNb-15He.tdb: C14_LAVES, type code %, sha256 870ac3d5afa50fc9…

55: PHASE C14_LAVES % 2 2 1 !
56: CONST C14_LAVES : CO% NB : CO NB% : !

CoNb-20Zho.tdb: C14_LAVES, type code %, sha256 9a76c67c6bba1992…

58: PHASE C14_LAVES % 2 2 1 !
59: CONST C14_LAVES : CO% NB : CO NB% : !

CoNb-22Wei.tdb: C14_LAVES, type code %, sha256 9d02f9031327c346…

65: PHASE C14_LAVES % 2 2 1 !
66: CONST C14_LAVES : CO% NB : CO NB% : !

Example references (6 of 6; assessments first):

doi:10.1016/j.jallcom.2015.02.182 Cuiyun He, Frank Stein, Martin Palm, Thermodynamic description of the systems Co–Nb, Al–Nb and Co–Al–Nb, Journal of Alloys and Compounds 637, 361-375 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s11661-020-05963-2 Chenyang Zhou, Cuiping Guo, Jingbo Li, Changrong Li, Zhenmin Du, Key Experiments and Thermodynamic Description of the Co-Nb-Ni System, Metall Mater Trans A 51, 5892-5911 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2022.166516 Dawei Wei, Xiaofeng Bai, Cuiping Guo, Changrong Li, Zhenmin Du, Experimental investigation and thermodynamic description of the Co–Nb–Ti system, Journal of Alloys and Compounds 924, 166516 (2022).
assessment that models this phase
doi:10.1016/j.intermet.2008.02.017 F. Stein, D. Jiang, M. Palm, G. Sauthoff, D. Grüner, G. Kreiner, Experimental reinvestigation of the Co–Nb phase diagram, Intermetallics 16, 785-792 (2008).
cited as the source of values for this phase
doi:10.1016/s0925-8388(97)00465-9 K.C.Hari Kumar, I. Ansara, P. Wollants, L. Delaey, Thermodynamic optimisation of the Co–Nb system, Journal of Alloys and Compounds 267, 105-112 (1998).
cited as the source of values for this phase
doi:10.1016/0022-5088(67)90004-5 J.K. Pargeter, W. Hume-Rothery, The constitution of niobium-cobalt alloys, Journal of the Less Common Metals 12, 366-374 (1967).
cited as the source of values for this phase

C15_LAVES (Co–Nb)

Id: phase:co-nb:c15-laves; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in CoNb-15He.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoNb-20Zho.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoNb-22Wei.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoNb-98Har-LB.tdb also describes the disordered state
Stability: stable in 4 of 4 calculated diagram(s): 300–1756.47 K, x(Nb) 0.25058–0.35362
Literature: 59 values (59 accepted) from 3 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:co-nb:c15-laves
paper: paper:10.1007/s11661-020-05963-2:λ2, paper:10.1016/j.jallcom.2015.02.182:C15, paper:10.1016/s0925-8388(97)00465-9:λ
tdb: tdb:CoNb-15He.tdb:C15_LAVES, tdb:CoNb-20Zho.tdb:C15_LAVES, tdb:CoNb-22Wei.tdb:C15_LAVES, tdb:CoNb-98Har-LB.tdb:C15_LAVES

TDB models of C15_LAVES (4): PHASE and CONSTITUENT statements as written

CoNb-15He.tdb: C15_LAVES, type code %, sha256 870ac3d5afa50fc9…

50: PHASE C15_LAVES % 2 2 1 !
51: CONST C15_LAVES : CO% NB : CO NB% : !

CoNb-20Zho.tdb: C15_LAVES, type code %, sha256 9a76c67c6bba1992…

53: PHASE C15_LAVES % 2 2 1 !
54: CONST C15_LAVES : CO% NB : CO NB% : !

CoNb-22Wei.tdb: C15_LAVES, type code %, sha256 9d02f9031327c346…

60: PHASE C15_LAVES % 2 2 1 !
61: CONST C15_LAVES : CO% NB : CO NB% : !

CoNb-98Har-LB.tdb: C15_LAVES, type code %, sha256 0243c89a99fdd870…

51: PHASE C15_LAVES % 2 2 1 !
52: CONST C15_LAVES : CO% NB : CO NB% : !

Example references (7 of 7; assessments first):

doi:10.1016/j.jallcom.2015.02.182 Cuiyun He, Frank Stein, Martin Palm, Thermodynamic description of the systems Co–Nb, Al–Nb and Co–Al–Nb, Journal of Alloys and Compounds 637, 361-375 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00465-9 K.C. Hari Kumar, I. Ansara, P. Wollants, L. Delaye, J. Alloys Compd., 267, 105-12(1998).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1007/s11661-020-05963-2 Chenyang Zhou, Cuiping Guo, Jingbo Li, Changrong Li, Zhenmin Du, Key Experiments and Thermodynamic Description of the Co-Nb-Ni System, Metall Mater Trans A 51, 5892-5911 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2022.166516 Dawei Wei, Xiaofeng Bai, Cuiping Guo, Changrong Li, Zhenmin Du, Experimental investigation and thermodynamic description of the Co–Nb–Ti system, Journal of Alloys and Compounds 924, 166516 (2022).
assessment that models this phase
doi:10.1016/j.intermet.2008.02.017 F. Stein, D. Jiang, M. Palm, G. Sauthoff, D. Grüner, G. Kreiner, Experimental reinvestigation of the Co–Nb phase diagram, Intermetallics 16, 785-792 (2008).
cited as the source of values for this phase
doi:10.1016/0022-5088(67)90004-5 J.K. Pargeter, W. Hume-Rothery, The constitution of niobium-cobalt alloys, Journal of the Less Common Metals 12, 366-374 (1967).
cited as the source of values for this phase
doi:10.1515/ijmr-1938-300917 W. ¨ Koster, W. Mulfinger, Z. Metallkde. 30 (1938) 348.
cited as the source of values for this phase

C36_LAVES (Co–Nb)

Id: phase:co-nb:c36-laves; status assigned
Structure: MgNi2 · C36 · hP24 · P6_3/mmc (194); type st:c36-mgni2-hp24; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in CoNb-15He.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoNb-20Zho.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoNb-22Wei.tdb also describes the disordered state
Stability: stable in 3 of 3 calculated diagram(s): 1302.19–1537.36 K, x(Nb) 0.23704–0.25743
Literature: 32 values (32 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:co-nb:c36-laves
paper: paper:10.1007/s11661-020-05963-2:λ3, paper:10.1016/j.jallcom.2015.02.182:C36
tdb: tdb:CoNb-15He.tdb:C36_LAVES, tdb:CoNb-20Zho.tdb:C36_LAVES, tdb:CoNb-22Wei.tdb:C36_LAVES

TDB models of C36_LAVES (3): PHASE and CONSTITUENT statements as written

CoNb-15He.tdb: C36_LAVES, type code %, sha256 870ac3d5afa50fc9…

45: PHASE C36_LAVES % 2 2 1 !
46: CONST C36_LAVES : CO% NB : CO NB% : !

CoNb-20Zho.tdb: C36_LAVES, type code %, sha256 9a76c67c6bba1992…

48: PHASE C36_LAVES % 2 2 1 !
49: CONST C36_LAVES : CO% NB : CO NB% : !

CoNb-22Wei.tdb: C36_LAVES, type code %, sha256 9d02f9031327c346…

55: PHASE C36_LAVES % 2 2 1 !
56: CONST C36_LAVES : CO% NB : CO NB% : !

Example references (6 of 6; assessments first):

doi:10.1016/j.jallcom.2015.02.182 Cuiyun He, Frank Stein, Martin Palm, Thermodynamic description of the systems Co–Nb, Al–Nb and Co–Al–Nb, Journal of Alloys and Compounds 637, 361-375 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s11661-020-05963-2 Chenyang Zhou, Cuiping Guo, Jingbo Li, Changrong Li, Zhenmin Du, Key Experiments and Thermodynamic Description of the Co-Nb-Ni System, Metall Mater Trans A 51, 5892-5911 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2022.166516 Dawei Wei, Xiaofeng Bai, Cuiping Guo, Changrong Li, Zhenmin Du, Experimental investigation and thermodynamic description of the Co–Nb–Ti system, Journal of Alloys and Compounds 924, 166516 (2022).
assessment that models this phase
doi:10.1016/j.intermet.2008.02.017 F. Stein, D. Jiang, M. Palm, G. Sauthoff, D. Grüner, G. Kreiner, Experimental reinvestigation of the Co–Nb phase diagram, Intermetallics 16, 785-792 (2008).
cited as the source of values for this phase
doi:10.1016/0022-5088(67)90004-5 J.K. Pargeter, W. Hume-Rothery, The constitution of niobium-cobalt alloys, Journal of the Less Common Metals 12, 366-374 (1967).
cited as the source of values for this phase
doi:10.1016/s0925-8388(97)00465-9 K.C.Hari Kumar, I. Ansara, P. Wollants, L. Delaey, Thermodynamic optimisation of the Co–Nb system, Journal of Alloys and Compounds 267, 105-112 (1998).
cited as the source of values for this phase

CO16NB9_C14 (Co–Nb)

Id: phase:co-nb:co16nb9-c14; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_C14; stoichiometry_contradicts_C14:CoNb-98Har-LB.tdb
Candidate (literature_printed): MgZn2 · hP12 — printed with a label mapped to this phase
Candidate (name_token): MgZn2 · C14 · hP12 · P6_3/mmc (194) — Strukturbericht/word 'C14' in the TDB name
Candidate (sgte_mmc2): MgZn2 · C14 · hP12 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for CO16NB9_C14: Co16Nb9
Candidate (tdb_comment): MgZn2 · hP12 · P6_3/mmc — CoNb-98Har-LB.tdb: 'Prototype MgZn2 (hP12, P6_3/mmc)'
Stoichiometry: Co 0.6400, Nb 0.3600
Stability: stable in 1 of 1 calculated diagram(s): 1460–1700.54 K, x(Nb) 0.36–0.36
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:co-nb:co16nb9-c14
paper: paper:10.1016/s0925-8388(97)00465-9:Co16Nb9
tdb: tdb:CoNb-98Har-LB.tdb:CO16NB9_C14

TDB models of CO16NB9_C14 (1): PHASE and CONSTITUENT statements as written

CoNb-98Har-LB.tdb: CO16NB9_C14, type code %, sha256 0243c89a99fdd870…

56: PHASE CO16NB9_C14 % 2 16 9 !
57: CONST CO16NB9_C14 : CO : NB : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(97)00465-9 K.C. Hari Kumar, I. Ansara, P. Wollants, L. Delaye, J. Alloys Compd., 267, 105-12(1998).
assessment that models this phase; reports values for this phase

CO3NB_C36 (Co–Nb)

Id: phase:co-nb:co3nb-c36; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_C36; stoichiometry_contradicts_C36:CoNb-98Har-LB.tdb
Candidate (dft_mp): P6_3/mmc (194) — on-hull MP NbCo3 at x(NB)=0.2500
Candidate (dft_oqmd): P63/mmc (194) — on-hull OQMD Co3 Nb1 at x(NB)=0.2500
Candidate (literature_printed): MgNi2 · hP24 — printed with a label mapped to this phase
Candidate (name_token): MgNi2 · C36 · hP24 · P6_3/mmc (194) — Strukturbericht/word 'C36' in the TDB name
Candidate (sgte_mmc2): MgNi2 · C36 · hP24 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for CO3NB_C36: Co3Nb
Candidate (tdb_comment): MgNi2 · hP24 · P6_3/mmc — CoNb-98Har-LB.tdb: 'Prototype MgNi2 (hP24, P6_3/mmc)'
Stoichiometry: Co 0.7500, Nb 0.2500
Stability: stable in 1 of 1 calculated diagram(s): 1277.93–1521.8 K, x(Nb) 0.25–0.25
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:co-nb:co3nb-c36
paper: paper:10.1016/s0925-8388(97)00465-9:Co3Nb
tdb: tdb:CoNb-98Har-LB.tdb:CO3NB_C36

TDB models of CO3NB_C36 (1): PHASE and CONSTITUENT statements as written

CoNb-98Har-LB.tdb: CO3NB_C36, type code %, sha256 0243c89a99fdd870…

46: PHASE CO3NB_C36 % 2 3 1 !
47: CONST CO3NB_C36 : CO : NB : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(97)00465-9 K.C. Hari Kumar, I. Ansara, P. Wollants, L. Delaye, J. Alloys Compd., 267, 105-12(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(67)90004-5 J.K. Pargeter, W. Hume-Rothery, The constitution of niobium-cobalt alloys, Journal of the Less Common Metals 12, 366-374 (1967).
cited as the source of values for this phase
doi:10.1149/1.2428700 Max Hansen, Kurt Anderko, H. W. Salzberg, Constitution of Binary Alloys, J. Electrochem. Soc. 105, 260C (1958).
cited as the source of values for this phase

CO7NB2 (Co–Nb)

Id: phase:co-nb:co7nb2; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (Co7Nb2) · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): (Co7Nb2) — Hallstedt 2025 mmc2 row for CO7NB2: Co7Nb2
Candidate (tdb_comment): Ni7Zr2 · mC36 · C2/m — CoNb-15He.tdb: 'Prototype Ni7Zr2 (mC36, C2/m)'
Candidate (tdb_comment): Ni7Zr2 · mC36 · C2/m — CoNb-20Zho.tdb: 'Prototype Ni7Zr2 (mC36, C2/m)'
Candidate (tdb_comment): Ni7Zr2 · mC36 · C2/m — CoNb-22Wei.tdb: 'Prototype Ni7Zr2 (mC36, C2/m)'
Stoichiometry: Co 0.7778, Nb 0.2222
Stability: stable in 4 of 4 calculated diagram(s): 300–1359.48 K, x(Nb) 0.22222–0.22222
Literature: 23 values (23 accepted) from 3 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:co-nb:co7nb2
paper: paper:10.1007/s11661-020-05963-2:Co7Nb2, paper:10.1016/j.jallcom.2015.02.182:Co7Nb2, paper:10.1016/s0925-8388(97)00465-9:Co7Nb2
tdb: tdb:CoNb-15He.tdb:CO7NB2, tdb:CoNb-20Zho.tdb:CO7NB2, tdb:CoNb-22Wei.tdb:CO7NB2, tdb:CoNb-98Har-LB.tdb:CO7NB2

TDB models of CO7NB2 (4): PHASE and CONSTITUENT statements as written

CoNb-15He.tdb: CO7NB2, type code %, sha256 870ac3d5afa50fc9…

40: PHASE CO7NB2 % 2 7 2 !
41: CONST CO7NB2 : CO : NB : !

CoNb-20Zho.tdb: CO7NB2, type code %, sha256 9a76c67c6bba1992…

43: PHASE CO7NB2 % 2 7 2 !
44: CONST CO7NB2 : CO : NB : !

CoNb-22Wei.tdb: CO7NB2, type code %, sha256 9d02f9031327c346…

50: PHASE CO7NB2 % 2 7 2 !
51: CONST CO7NB2 : CO : NB : !

CoNb-98Har-LB.tdb: CO7NB2, type code %, sha256 0243c89a99fdd870…

41: PHASE CO7NB2 % 2 7 2 !
42: CONST CO7NB2 : CO : NB : !

Example references (5 of 5; assessments first):

doi:10.1016/j.jallcom.2015.02.182 Cuiyun He, Frank Stein, Martin Palm, Thermodynamic description of the systems Co–Nb, Al–Nb and Co–Al–Nb, Journal of Alloys and Compounds 637, 361-375 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s11661-020-05963-2 Chenyang Zhou, Cuiping Guo, Jingbo Li, Changrong Li, Zhenmin Du, Key Experiments and Thermodynamic Description of the Co-Nb-Ni System, Metall Mater Trans A 51, 5892-5911 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00465-9 K.C. Hari Kumar, I. Ansara, P. Wollants, L. Delaye, J. Alloys Compd., 267, 105-12(1998).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.jallcom.2022.166516 Dawei Wei, Xiaofeng Bai, Cuiping Guo, Changrong Li, Zhenmin Du, Experimental investigation and thermodynamic description of the Co–Nb–Ti system, Journal of Alloys and Compounds 924, 166516 (2022).
assessment that models this phase
doi:10.1016/j.intermet.2008.02.017 F. Stein, D. Jiang, M. Palm, G. Sauthoff, D. Grüner, G. Kreiner, Experimental reinvestigation of the Co–Nb phase diagram, Intermetallics 16, 785-792 (2008).
cited as the source of values for this phase

MU_D85 (Co–Nb)

Id: phase:co-nb: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 CoNb-15He.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoNb-20Zho.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoNb-22Wei.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CoNb-98Har-LB.tdb also describes the disordered state
Stability: stable in 4 of 4 calculated diagram(s): 300–1708.54 K, x(Nb) 0.45992–0.56446
Literature: 48 values (48 accepted) from 3 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:co-nb:d85-mu, corpus:phase:co-nb:mu-d85
paper: paper:10.1007/s11661-020-05963-2:CoNb, paper:10.1016/j.jallcom.2015.02.182:Co7Nb6(μ), paper:10.1016/s0925-8388(97)00465-9:μ
tdb: tdb:CoNb-15He.tdb:MU_D85, tdb:CoNb-20Zho.tdb:MU_D85, tdb:CoNb-22Wei.tdb:MU_D85, tdb:CoNb-98Har-LB.tdb:MU_D85

TDB models of MU_D85 (4): PHASE and CONSTITUENT statements as written

CoNb-15He.tdb: MU_D85, type code %, sha256 870ac3d5afa50fc9…

60: PHASE MU_D85 % 4 1 4 2 6 !
61: CONST MU_D85 : CO : NB : CO NB : CO NB : !

CoNb-20Zho.tdb: MU_D85, type code %, sha256 9a76c67c6bba1992…

63: PHASE MU_D85 % 4 1 4 2 6 !
64: CONST MU_D85 : CO NB : NB : CO NB : CO NB : !

CoNb-22Wei.tdb: MU_D85, type code %, sha256 9d02f9031327c346…

70: PHASE MU_D85 % 4 1 4 2 6 !
71: CONST MU_D85 : CO NB : NB : CO NB : CO NB : !

CoNb-98Har-LB.tdb: MU_D85, type code %, sha256 0243c89a99fdd870…

61: PHASE MU_D85 % 4 1 2 6 4 !
62: CONST MU_D85 : CO NB : CO NB : CO : NB : !

Example references (6 of 6; assessments first):

doi:10.1016/j.jallcom.2015.02.182 Cuiyun He, Frank Stein, Martin Palm, Thermodynamic description of the systems Co–Nb, Al–Nb and Co–Al–Nb, Journal of Alloys and Compounds 637, 361-375 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00465-9 K.C. Hari Kumar, I. Ansara, P. Wollants, L. Delaye, J. Alloys Compd., 267, 105-12(1998).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1007/s11661-020-05963-2 Chenyang Zhou, Cuiping Guo, Jingbo Li, Changrong Li, Zhenmin Du, Key Experiments and Thermodynamic Description of the Co-Nb-Ni System, Metall Mater Trans A 51, 5892-5911 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2022.166516 Dawei Wei, Xiaofeng Bai, Cuiping Guo, Changrong Li, Zhenmin Du, Experimental investigation and thermodynamic description of the Co–Nb–Ti system, Journal of Alloys and Compounds 924, 166516 (2022).
assessment that models this phase
doi:10.1016/0022-5088(67)90004-5 J.K. Pargeter, W. Hume-Rothery, The constitution of niobium-cobalt alloys, Journal of the Less Common Metals 12, 366-374 (1967).
cited as the source of values for this phase
doi:10.1016/j.intermet.2008.02.017 F. Stein, D. Jiang, M. Palm, G. Sauthoff, D. Grüner, G. Kreiner, Experimental reinvestigation of the Co–Nb phase diagram, Intermetallics 16, 785-792 (2008).
cited as the source of values for this phase

FCC_A1 (Co–Nb)

Id: phase:co-nb: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 4 of 4 calculated diagram(s): 688.19–1768.99 K, x(Nb) 0–0.05372
Literature: 27 values (27 accepted) from 3 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:co-nb:fcc-a1
paper: paper:10.1007/s11661-020-05963-2:fcc(Co), paper:10.1016/j.jallcom.2015.02.182:(αCo), paper:10.1016/s0925-8388(97)00465-9:fcc
tdb: tdb:CoNb-15He.tdb:FCC_A1, tdb:CoNb-20Zho.tdb:FCC_A1, tdb:CoNb-22Wei.tdb:FCC_A1, tdb:CoNb-98Har-LB.tdb:FCC_A1

TDB models of FCC_A1 (4): PHASE and CONSTITUENT statements as written

CoNb-15He.tdb: FCC_A1, type code %A, sha256 870ac3d5afa50fc9…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : CO% NB : VA : !

CoNb-20Zho.tdb: FCC_A1, type code %A, sha256 9a76c67c6bba1992…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : CO% NB : VA : !

CoNb-22Wei.tdb: FCC_A1, type code %A, sha256 9d02f9031327c346…

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

CoNb-98Har-LB.tdb: FCC_A1, type code %A, sha256 0243c89a99fdd870…

26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : CO% NB : VA : !

Example references (7 of 7; assessments first):

doi:10.1016/j.jallcom.2015.02.182 Cuiyun He, Frank Stein, Martin Palm, Thermodynamic description of the systems Co–Nb, Al–Nb and Co–Al–Nb, Journal of Alloys and Compounds 637, 361-375 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00465-9 K.C. Hari Kumar, I. Ansara, P. Wollants, L. Delaye, J. Alloys Compd., 267, 105-12(1998).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1007/s11661-020-05963-2 Chenyang Zhou, Cuiping Guo, Jingbo Li, Changrong Li, Zhenmin Du, Key Experiments and Thermodynamic Description of the Co-Nb-Ni System, Metall Mater Trans A 51, 5892-5911 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2022.166516 Dawei Wei, Xiaofeng Bai, Cuiping Guo, Changrong Li, Zhenmin Du, Experimental investigation and thermodynamic description of the Co–Nb–Ti system, Journal of Alloys and Compounds 924, 166516 (2022).
assessment that models this phase
doi:10.1016/j.intermet.2008.02.017 F. Stein, D. Jiang, M. Palm, G. Sauthoff, D. Grüner, G. Kreiner, Experimental reinvestigation of the Co–Nb phase diagram, Intermetallics 16, 785-792 (2008).
cited as the source of values for this phase
doi:10.1016/0022-5088(67)90004-5 J.K. Pargeter, W. Hume-Rothery, The constitution of niobium-cobalt alloys, Journal of the Less Common Metals 12, 366-374 (1967).
cited as the source of values for this phase
doi:10.1149/1.2428700 Max Hansen, Kurt Anderko, H. W. Salzberg, Constitution of Binary Alloys, J. Electrochem. Soc. 105, 260C (1958).
cited as the source of values for this phase

HCP_A3 (Co–Nb)

Id: phase:co-nb: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 4 of 4 calculated diagram(s): 300–819.19 K, x(Nb) 0–7e-05
Literature: 3 values (3 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:co-nb:hcp-a3
paper: paper:10.1016/j.jallcom.2015.02.182:(εCo), paper:10.1016/s0925-8388(97)00465-9:hcp
tdb: tdb:CoNb-15He.tdb:HCP_A3, tdb:CoNb-20Zho.tdb:HCP_A3, tdb:CoNb-22Wei.tdb:HCP_A3, tdb:CoNb-98Har-LB.tdb:HCP_A3

TDB models of HCP_A3 (4): PHASE and CONSTITUENT statements as written

CoNb-15He.tdb: HCP_A3, type code %A, sha256 870ac3d5afa50fc9…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : CO% NB : VA : !

CoNb-20Zho.tdb: HCP_A3, type code %A, sha256 9a76c67c6bba1992…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : CO% NB : VA : !

CoNb-22Wei.tdb: HCP_A3, type code %A, sha256 9d02f9031327c346…

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

CoNb-98Har-LB.tdb: HCP_A3, type code %A, sha256 0243c89a99fdd870…

36: PHASE HCP_A3 %A 2 1 0.5 !
37: CONST HCP_A3 : CO% NB : VA : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2015.02.182 Cuiyun He, Frank Stein, Martin Palm, Thermodynamic description of the systems Co–Nb, Al–Nb and Co–Al–Nb, Journal of Alloys and Compounds 637, 361-375 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00465-9 K.C. Hari Kumar, I. Ansara, P. Wollants, L. Delaye, J. Alloys Compd., 267, 105-12(1998).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1007/s11661-020-05963-2 Chenyang Zhou, Cuiping Guo, Jingbo Li, Changrong Li, Zhenmin Du, Key Experiments and Thermodynamic Description of the Co-Nb-Ni System, Metall Mater Trans A 51, 5892-5911 (2020).
assessment that models this phase
doi:10.1016/j.jallcom.2022.166516 Dawei Wei, Xiaofeng Bai, Cuiping Guo, Changrong Li, Zhenmin Du, Experimental investigation and thermodynamic description of the Co–Nb–Ti system, Journal of Alloys and Compounds 924, 166516 (2022).
assessment that models this phase

LIQUID (Co–Nb)

Id: phase:co-nb:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 4 of 4 calculated diagram(s): 1503.83–4000 K, x(Nb) 0–1
Literature: 90 values (90 accepted) from 3 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:co-nb:liquid
paper: paper:10.1007/s11661-020-05963-2:Liq., paper:10.1007/s11661-020-05963-2:liq., paper:10.1016/j.jallcom.2015.02.182:L, paper:10.1016/j.jallcom.2015.02.182:Liq, paper:10.1016/s0925-8388(97)00465-9:L
tdb: tdb:CoNb-15He.tdb:LIQUID, tdb:CoNb-20Zho.tdb:LIQUID, tdb:CoNb-22Wei.tdb:LIQUID, tdb:CoNb-98Har-LB.tdb:LIQUID

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

CoNb-15He.tdb: LIQUID, type code %, sha256 870ac3d5afa50fc9…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : CO NB : !

CoNb-20Zho.tdb: LIQUID, type code %, sha256 9a76c67c6bba1992…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : CO NB : !

CoNb-22Wei.tdb: LIQUID, type code %, sha256 9d02f9031327c346…

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

CoNb-98Har-LB.tdb: LIQUID, type code %, sha256 0243c89a99fdd870…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : CO NB : !

Example references (8 of 8; assessments first):

doi:10.1016/j.jallcom.2015.02.182 Cuiyun He, Frank Stein, Martin Palm, Thermodynamic description of the systems Co–Nb, Al–Nb and Co–Al–Nb, Journal of Alloys and Compounds 637, 361-375 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00465-9 K.C. Hari Kumar, I. Ansara, P. Wollants, L. Delaye, J. Alloys Compd., 267, 105-12(1998).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1007/s11661-020-05963-2 Chenyang Zhou, Cuiping Guo, Jingbo Li, Changrong Li, Zhenmin Du, Key Experiments and Thermodynamic Description of the Co-Nb-Ni System, Metall Mater Trans A 51, 5892-5911 (2020).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2022.166516 Dawei Wei, Xiaofeng Bai, Cuiping Guo, Changrong Li, Zhenmin Du, Experimental investigation and thermodynamic description of the Co–Nb–Ti system, Journal of Alloys and Compounds 924, 166516 (2022).
assessment that models this phase
doi:10.1016/0022-5088(67)90004-5 J.K. Pargeter, W. Hume-Rothery, The constitution of niobium-cobalt alloys, Journal of the Less Common Metals 12, 366-374 (1967).
cited as the source of values for this phase
doi:10.1016/j.intermet.2008.02.017 F. Stein, D. Jiang, M. Palm, G. Sauthoff, D. Grüner, G. Kreiner, Experimental reinvestigation of the Co–Nb phase diagram, Intermetallics 16, 785-792 (2008).
cited as the source of values for this phase
doi:10.1149/1.2428700 Max Hansen, Kurt Anderko, H. W. Salzberg, Constitution of Binary Alloys, J. Electrochem. Soc. 105, 260C (1958).
cited as the source of values for this phase
doi:10.1515/ijmr-1938-300917 W. ¨ Koster, W. Mulfinger, Z. Metallkde. 30 (1938) 348.
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}
}