B–Nb phases

11 phases (tier A 4, tier C 2, liquid 1, needs_review 4); 9 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 · B–Nb system page · Markdown · field reference

Phases of the B–Nb system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BETA_RHOMBO_B phase:b-nb:b-beta-rhombo		needs_review	stable in 5 of 5 calculated diagram(s): 300–2363.97 K, x(B) 0.99521–1	4	5
BCC_A2 phase:b-nb:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 5 of 5 calculated diagram(s): 300–3999.99 K, x(B) 0–0.02696	9	5
FCC_A1 phase:b-nb:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 5 calculated diagram(s)	0	5
HCP_A3 phase:b-nb: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:b-nb:liquid	liquid	liquid	stable in 5 of 5 calculated diagram(s): 2270.37–4000 K, x(B) 0–1	27	5
NB2B3 phase:b-nb:nb2b3	V2B3 · oC20 · Cmcm (63)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 4 of 4 calculated diagram(s): 300–2710 K, x(B) 0.6–0.6	2	4
NB3B2_D5A phase:b-nb:nb3b2-d5a	Si2U3 · D5_a · tP10 · P4/mbm (127)	tier A: standard phase name	stable in 5 of 5 calculated diagram(s): 300–2460 K, x(B) 0.4–0.4	7	5
NB3B4_D7B phase:b-nb:nb3b4-d7b		needs_review	stable in 5 of 5 calculated diagram(s): 300–3213.89 K, x(B) 0.57143–0.572	11	5
NB5B6 phase:b-nb:nb5b6		needs_review	stable in 5 of 5 calculated diagram(s): 300–3197.32 K, x(B) 0.545–0.54545	9	5
NBB_B33 phase:b-nb:nbb-b33	CrB · B33 · oC8 · Cmcm (63)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 5 of 5 calculated diagram(s): 300–3193.41 K, x(B) 0.47539–0.5	18	5
NBB2_C32 phase:b-nb:nbb2-c32		needs_review	stable in 5 of 5 calculated diagram(s): 300–3320.66 K, x(B) 0.60952–0.72082	15	5

BETA_RHOMBO_B (B–Nb)

Id: phase:b-nb:b-beta-rhombo; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:RHOMBO; no_structure_token
Candidate (sgte_mmc2): beta-B · hR105 · R-3m (166) — Hallstedt 2025 mmc2 row for BETA_RHOMBO_B: beta-B
Candidate (tdb_comment): beta-B · hR105 · R-3m — NbB-07Pec.tdb: 'Prototype beta-B (hR105, R-3m)'
Candidate (tdb_comment): beta-B · hR105 · R-3m — NbB-08Wit.tdb: 'Prototype beta-B (hR105, R-3m)'
Candidate (tdb_comment): beta-B · hR105 · R-3m — NbB-08Yos.tdb: 'Prototype beta-B (hR105, R-3m)'
Candidate (tdb_comment): beta-B · hR105 · R-3m — NbB-09Nak.tdb: 'Prototype beta-B (hR105, R-3m)'
Candidate (tdb_comment): beta-B · hR105 · R-3m — NbB-23Pan.tdb: 'Prototype beta-B (hR105, R-3m)'
Stability: stable in 5 of 5 calculated diagram(s): 300–2363.97 K, x(B) 0.99521–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:b-nb:b-beta-rhombo, corpus:phase:b-nb:beta-rhombo-b
paper: paper:10.1016/j.jallcom.2006.10.034:(βB)
tdb: tdb:NbB-07Pec.tdb:BETA_RHOMBO_B, tdb:NbB-08Wit.tdb:BETA_RHOMBO_B, tdb:NbB-08Yos.tdb:BETA_RHOMBO_B, tdb:NbB-09Nak.tdb:BETA_RHOMBO_B, tdb:NbB-23Pan.tdb:BETA_RHOMBO_B

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

NbB-07Pec.tdb: BETA_RHOMBO_B, type code %, sha256 69bb1b9f802ec19a…

46: PHASE BETA_RHOMBO_B % 1 1 !
47: CONST BETA_RHOMBO_B : B : !

NbB-08Wit.tdb: BETA_RHOMBO_B, type code %, sha256 2bc2c38fb45e540c…

45: PHASE BETA_RHOMBO_B % 1 1 !
46: CONST BETA_RHOMBO_B : B NB : !

NbB-08Yos.tdb: BETA_RHOMBO_B, type code %, sha256 3dfd7add5bd6f596…

44: PHASE BETA_RHOMBO_B % 1 1 !
45: CONST BETA_RHOMBO_B : B : !

NbB-09Nak.tdb: BETA_RHOMBO_B, type code %, sha256 a5b39b98692d5b70…

46: PHASE BETA_RHOMBO_B % 1 1 !
47: CONST BETA_RHOMBO_B : B : !

NbB-23Pan.tdb: BETA_RHOMBO_B, type code %, sha256 71523b86a3d618ea…

46: PHASE BETA_RHOMBO_B % 1 1 !
47: CONST BETA_RHOMBO_B : B NB : !

Example references (6 of 6; assessments first):

doi:10.1016/j.jallcom.2006.10.034 V.T. Witusiewicz, A.A. Bondar, U. Hecht, S. Rex, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 448, 185-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2023.102602 Y. Pan, X. Yang, Z. Fan, A. Liu, J. Zhang, F. Luo, Y. Du, L. Huang, Calphad, 82, 102602(2023).
assessment that models this phase
doi:10.1016/j.intermet.2006.10.054 Rockfeller Maciel Peçanha, Flávio Ferreira, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Bo Sundman, Thermodynamic modeling of the Nb–B system, Intermetallics 15, 999-1005 (2007).
assessment that models this phase
doi:10.2320/matertrans.MC200820 Y. Nakama, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 50, 984-93(2009).
assessment that models this phase
doi:10.2355/isijinternational.48.835 K. Yoshitomi, Y. Nakama, H. Ohtani, M. Hasebe, ISIJ Int., 48, 835-44(2008).
assessment that models this phase
doi:10.1016/0364-5916(84)90026-9 L. Kaufman, B. Uhrenius, D. Birnie, K. Taylor, Calphad 8 (1984) 25–66.
cited as the source of values for this phase

BCC_A2 (B–Nb)

Id: phase:b-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 5 of 5 calculated diagram(s): 300–3999.99 K, x(B) 0–0.02696
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:b-nb:bcc-a2
paper: paper:10.1016/j.jallcom.2006.10.034:bcc
tdb: tdb:NbB-07Pec.tdb:BCC_A2, tdb:NbB-08Wit.tdb:BCC_A2, tdb:NbB-08Yos.tdb:BCC_A2, tdb:NbB-09Nak.tdb:BCC_A2, tdb:NbB-23Pan.tdb:BCC_A2

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

NbB-07Pec.tdb: BCC_A2, type code %B, sha256 69bb1b9f802ec19a…

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

NbB-08Wit.tdb: BCC_A2, type code %B, sha256 2bc2c38fb45e540c…

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

NbB-08Yos.tdb: BCC_A2, type code %B, sha256 3dfd7add5bd6f596…

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

NbB-09Nak.tdb: BCC_A2, type code %B, sha256 a5b39b98692d5b70…

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

NbB-23Pan.tdb: BCC_A2, type code %B, sha256 71523b86a3d618ea…

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

Example references (6 of 6; assessments first):

doi:10.1016/j.jallcom.2006.10.034 V.T. Witusiewicz, A.A. Bondar, U. Hecht, S. Rex, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 448, 185-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2023.102602 Y. Pan, X. Yang, Z. Fan, A. Liu, J. Zhang, F. Luo, Y. Du, L. Huang, Calphad, 82, 102602(2023).
assessment that models this phase
doi:10.1016/j.intermet.2006.10.054 Rockfeller Maciel Peçanha, Flávio Ferreira, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Bo Sundman, Thermodynamic modeling of the Nb–B system, Intermetallics 15, 999-1005 (2007).
assessment that models this phase
doi:10.2320/matertrans.MC200820 Y. Nakama, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 50, 984-93(2009).
assessment that models this phase
doi:10.2355/isijinternational.48.835 K. Yoshitomi, Y. Nakama, H. Ohtani, M. Hasebe, ISIJ Int., 48, 835-44(2008).
assessment that models this phase
doi:10.1016/0364-5916(84)90026-9 L. Kaufman, B. Uhrenius, D. Birnie, K. Taylor, Calphad 8 (1984) 25–66.
cited as the source of values for this phase

FCC_A1 (B–Nb)

Id: phase:b-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: not stable in 5 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:b-nb:fcc-a1
tdb: tdb:NbB-07Pec.tdb:FCC_A1, tdb:NbB-08Wit.tdb:FCC_A1, tdb:NbB-08Yos.tdb:FCC_A1, tdb:NbB-09Nak.tdb:FCC_A1, tdb:NbB-23Pan.tdb:FCC_A1

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

NbB-07Pec.tdb: FCC_A1, type code %A, sha256 69bb1b9f802ec19a…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : NB : B VA% : !

NbB-08Wit.tdb: FCC_A1, type code %A, sha256 2bc2c38fb45e540c…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : NB : B VA% : !

NbB-08Yos.tdb: FCC_A1, type code %A, sha256 3dfd7add5bd6f596…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : B NB : VA% : !

NbB-09Nak.tdb: FCC_A1, type code %A, sha256 a5b39b98692d5b70…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : B NB : VA% : !

NbB-23Pan.tdb: FCC_A1, type code %A, sha256 71523b86a3d618ea…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : NB : B VA% : !

Example references (5 of 5; assessments first):

doi:10.1016/j.calphad.2023.102602 Y. Pan, X. Yang, Z. Fan, A. Liu, J. Zhang, F. Luo, Y. Du, L. Huang, Calphad, 82, 102602(2023).
assessment that models this phase
doi:10.1016/j.intermet.2006.10.054 Rockfeller Maciel Peçanha, Flávio Ferreira, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Bo Sundman, Thermodynamic modeling of the Nb–B system, Intermetallics 15, 999-1005 (2007).
assessment that models this phase
doi:10.1016/j.jallcom.2006.10.034 V.T. Witusiewicz, A.A. Bondar, U. Hecht, S. Rex, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 448, 185-194 (2008).
assessment that models this phase
doi:10.2320/matertrans.MC200820 Y. Nakama, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 50, 984-93(2009).
assessment that models this phase
doi:10.2355/isijinternational.48.835 K. Yoshitomi, Y. Nakama, H. Ohtani, M. Hasebe, ISIJ Int., 48, 835-44(2008).
assessment that models this phase

HCP_A3 (B–Nb)

Id: phase:b-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: not stable in 5 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:b-nb:hcp-a3
tdb: tdb:NbB-07Pec.tdb:HCP_A3, tdb:NbB-08Wit.tdb:HCP_A3, tdb:NbB-08Yos.tdb:HCP_A3, tdb:NbB-09Nak.tdb:HCP_A3, tdb:NbB-23Pan.tdb:HCP_A3

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

NbB-07Pec.tdb: HCP_A3, type code %A, sha256 69bb1b9f802ec19a…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : NB : B VA% : !

NbB-08Wit.tdb: HCP_A3, type code %A, sha256 2bc2c38fb45e540c…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : NB : B VA% : !

NbB-08Yos.tdb: HCP_A3, type code %A, sha256 3dfd7add5bd6f596…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : B NB : VA : !

NbB-09Nak.tdb: HCP_A3, type code %A, sha256 a5b39b98692d5b70…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : B NB : VA : !

NbB-23Pan.tdb: HCP_A3, type code %A, sha256 71523b86a3d618ea…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : NB : B VA% : !

Example references (5 of 5; assessments first):

doi:10.1016/j.calphad.2023.102602 Y. Pan, X. Yang, Z. Fan, A. Liu, J. Zhang, F. Luo, Y. Du, L. Huang, Calphad, 82, 102602(2023).
assessment that models this phase
doi:10.1016/j.intermet.2006.10.054 Rockfeller Maciel Peçanha, Flávio Ferreira, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Bo Sundman, Thermodynamic modeling of the Nb–B system, Intermetallics 15, 999-1005 (2007).
assessment that models this phase
doi:10.1016/j.jallcom.2006.10.034 V.T. Witusiewicz, A.A. Bondar, U. Hecht, S. Rex, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 448, 185-194 (2008).
assessment that models this phase
doi:10.2320/matertrans.MC200820 Y. Nakama, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 50, 984-93(2009).
assessment that models this phase
doi:10.2355/isijinternational.48.835 K. Yoshitomi, Y. Nakama, H. Ohtani, M. Hasebe, ISIJ Int., 48, 835-44(2008).
assessment that models this phase

LIQUID (B–Nb)

Id: phase:b-nb:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 5 of 5 calculated diagram(s): 2270.37–4000 K, x(B) 0–1
Literature: 27 values (27 accepted) from 1 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:b-nb:liquid
paper: paper:10.1016/j.jallcom.2006.10.034:L
tdb: tdb:NbB-07Pec.tdb:LIQUID, tdb:NbB-08Wit.tdb:LIQUID, tdb:NbB-08Yos.tdb:LIQUID, tdb:NbB-09Nak.tdb:LIQUID, tdb:NbB-23Pan.tdb:LIQUID

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

NbB-07Pec.tdb: LIQUID, type code %, sha256 69bb1b9f802ec19a…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : B NB : !

NbB-08Wit.tdb: LIQUID, type code %, sha256 2bc2c38fb45e540c…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : B NB : !

NbB-08Yos.tdb: LIQUID, type code %, sha256 3dfd7add5bd6f596…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : B NB : !

NbB-09Nak.tdb: LIQUID, type code %, sha256 a5b39b98692d5b70…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : B NB : !

NbB-23Pan.tdb: LIQUID, type code %, sha256 71523b86a3d618ea…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : B NB : !

Example references (6 of 6; assessments first):

doi:10.1016/j.jallcom.2006.10.034 V.T. Witusiewicz, A.A. Bondar, U. Hecht, S. Rex, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 448, 185-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2023.102602 Y. Pan, X. Yang, Z. Fan, A. Liu, J. Zhang, F. Luo, Y. Du, L. Huang, Calphad, 82, 102602(2023).
assessment that models this phase
doi:10.1016/j.intermet.2006.10.054 Rockfeller Maciel Peçanha, Flávio Ferreira, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Bo Sundman, Thermodynamic modeling of the Nb–B system, Intermetallics 15, 999-1005 (2007).
assessment that models this phase
doi:10.2320/matertrans.MC200820 Y. Nakama, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 50, 984-93(2009).
assessment that models this phase
doi:10.2355/isijinternational.48.835 K. Yoshitomi, Y. Nakama, H. Ohtani, M. Hasebe, ISIJ Int., 48, 835-44(2008).
assessment that models this phase
doi:10.1016/0364-5916(84)90026-9 L. Kaufman, B. Uhrenius, D. Birnie, K. Taylor, Calphad 8 (1984) 25–66.
cited as the source of values for this phase

NB2B3 (B–Nb)

Id: phase:b-nb:nb2b3; status assigned
Structure: V2B3 · oC20 · Cmcm (63); type st:v2b3-oc20; 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 (dft_space_group_63_matches_3_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: B 0.6000, Nb 0.4000
Stability: stable in 4 of 4 calculated diagram(s): 300–2710 K, x(B) 0.6–0.6
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:b-nb:nb2b3
paper: paper:10.1016/j.jallcom.2006.10.034:Nb2B3
tdb: tdb:NbB-08Wit.tdb:NB2B3, tdb:NbB-08Yos.tdb:NB2B3, tdb:NbB-09Nak.tdb:NB2B3, tdb:NbB-23Pan.tdb:NB2B3

TDB models of NB2B3 (4): PHASE and CONSTITUENT statements as written

NbB-08Wit.tdb: NB2B3, type code %, sha256 2bc2c38fb45e540c…

70: PHASE NB2B3 % 2 2 3 !
71: CONST NB2B3 : NB : B : !

NbB-08Yos.tdb: NB2B3, type code %, sha256 3dfd7add5bd6f596…

69: PHASE NB2B3 % 2 2 3 !
70: CONST NB2B3 : NB : B : !

NbB-09Nak.tdb: NB2B3, type code %, sha256 a5b39b98692d5b70…

71: PHASE NB2B3 % 2 0.4 0.6 !
72: CONST NB2B3 : NB : B : !

NbB-23Pan.tdb: NB2B3, type code %, sha256 71523b86a3d618ea…

71: PHASE NB2B3 % 2 2 3 !
72: CONST NB2B3 : NB : B : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2006.10.034 V.T. Witusiewicz, A.A. Bondar, U. Hecht, S. Rex, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 448, 185-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2023.102602 Y. Pan, X. Yang, Z. Fan, A. Liu, J. Zhang, F. Luo, Y. Du, L. Huang, Calphad, 82, 102602(2023).
assessment that models this phase
doi:10.2320/matertrans.MC200820 Y. Nakama, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 50, 984-93(2009).
assessment that models this phase
doi:10.2355/isijinternational.48.835 K. Yoshitomi, Y. Nakama, H. Ohtani, M. Hasebe, ISIJ Int., 48, 835-44(2008).
assessment that models this phase

NB3B2_D5A (B–Nb)

Id: phase:b-nb:nb3b2-d5a; status assigned
Structure: Si2U3 · D5_a · tP10 · P4/mbm (127); type st:d5-a-si2u3-tp10; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaabept and oqmd-18595, space group 127
Stoichiometry: B 0.4000, Nb 0.6000
Stability: stable in 5 of 5 calculated diagram(s): 300–2460 K, x(B) 0.4–0.4
Literature: 7 values (7 accepted) from 2 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:b-nb:nb3b2-d5a
mp: mp:mp-aaaabept
oqmd: oqmd:oqmd-18595
paper: paper:10.1016/j.intermet.2006.10.054:Nb3B2, paper:10.1016/j.jallcom.2006.10.034:Nb3B2
tdb: tdb:NbB-07Pec.tdb:NB3B2_D5A, tdb:NbB-08Wit.tdb:NB3B2_D5A, tdb:NbB-08Yos.tdb:NB3B2_D5A, tdb:NbB-09Nak.tdb:NB3B2_D5A, tdb:NbB-23Pan.tdb:NB3B2_D5A

TDB models of NB3B2_D5A (5): PHASE and CONSTITUENT statements as written

NbB-07Pec.tdb: NB3B2_D5A, type code %, sha256 69bb1b9f802ec19a…

51: PHASE NB3B2_D5A % 2 3 2 !
52: CONST NB3B2_D5A : NB : B : !

NbB-08Wit.tdb: NB3B2_D5A, type code %, sha256 2bc2c38fb45e540c…

50: PHASE NB3B2_D5A % 2 3 2 !
51: CONST NB3B2_D5A : NB : B : !

NbB-08Yos.tdb: NB3B2_D5A, type code %, sha256 3dfd7add5bd6f596…

49: PHASE NB3B2_D5A % 2 3 2 !
50: CONST NB3B2_D5A : NB : B : !

NbB-09Nak.tdb: NB3B2_D5A, type code %, sha256 a5b39b98692d5b70…

51: PHASE NB3B2_D5A % 2 0.6 0.4 !
52: CONST NB3B2_D5A : NB : B : !

NbB-23Pan.tdb: NB3B2_D5A, type code %, sha256 71523b86a3d618ea…

51: PHASE NB3B2_D5A % 2 3 2 !
52: CONST NB3B2_D5A : NB : B : !

Example references (7 of 7; assessments first):

doi:10.1016/j.jallcom.2006.10.034 V.T. Witusiewicz, A.A. Bondar, U. Hecht, S. Rex, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 448, 185-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2006.10.054 Rockfeller Maciel Peçanha, Flávio Ferreira, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Bo Sundman, Thermodynamic modeling of the Nb–B system, Intermetallics 15, 999-1005 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2023.102602 Y. Pan, X. Yang, Z. Fan, A. Liu, J. Zhang, F. Luo, Y. Du, L. Huang, Calphad, 82, 102602(2023).
assessment that models this phase
doi:10.2320/matertrans.MC200820 Y. Nakama, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 50, 984-93(2009).
assessment that models this phase
doi:10.2355/isijinternational.48.835 K. Yoshitomi, Y. Nakama, H. Ohtani, M. Hasebe, ISIJ Int., 48, 835-44(2008).
assessment that models this phase
doi:10.1007/bf00794439 A. V. Blinder, A. S. Bolgar, Heat capacity and enthalpy of transition-metal borides in a broad range of temperatures, Powder Metall Met Ceram 30, 1053-1056 (1991).
cited as the source of values for this phase
doi:10.1016/0364-5916(84)90026-9 L. Kaufman, B. Uhrenius, D. Birnie, K. Taylor, Calphad 8 (1984) 25–66.
cited as the source of values for this phase

NB3B4_D7B (B–Nb)

Id: phase:b-nb:nb3b4-d7b; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:models_disagree_on_composition; models_disagree_on_composition; stoichiometry_contradicts_D7_b:NbB-09Nak.tdb
Candidate (literature_printed): Ta3B4 · oI14 — printed with a label mapped to this phase
Candidate (name_token): Ta3B4 · D7_b · oI14 · Immm (71) — Strukturbericht/word 'D7B' in the TDB name
Candidate (sgte_mmc2): Ta3B4 · D7_b · oI14 · Immm (71) — Hallstedt 2025 mmc2 row for NB3B4_D7B: Nb3B4
Candidate (tdb_comment): Ta3B4 · oI14 · Immm — NbB-07Pec.tdb: 'Prototype Ta3B4 (oI14, Immm)'
Candidate (tdb_comment): Ta3B4 · oI14 · Immm — NbB-08Wit.tdb: 'Prototype Ta3B4 (oI14, Immm)'
Candidate (tdb_comment): Ta3B4 · oI14 · Immm — NbB-08Yos.tdb: 'Prototype Ta3B4 (oI14, Immm)'
Candidate (tdb_comment): Ta3B4 · oI14 · Immm — NbB-09Nak.tdb: 'Prototype Ta3B4 (oI14, Immm)'
Candidate (tdb_comment): Ta3B4 · oI14 · Immm — NbB-23Pan.tdb: 'Prototype Ta3B4 (oI14, Immm)'
Stability: stable in 5 of 5 calculated diagram(s): 300–3213.89 K, x(B) 0.57143–0.572
Literature: 11 values (11 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:b-nb:nb3b4-d7b
paper: paper:10.1016/j.intermet.2006.10.054:Nb3B4, paper:10.1016/j.jallcom.2006.10.034:Nb3B4
tdb: tdb:NbB-07Pec.tdb:NB3B4_D7B, tdb:NbB-08Wit.tdb:NB3B4_D7B, tdb:NbB-08Yos.tdb:NB3B4_D7B, tdb:NbB-09Nak.tdb:NB3B4_D7B, tdb:NbB-23Pan.tdb:NB3B4_D7B

TDB models of NB3B4_D7B (5): PHASE and CONSTITUENT statements as written

NbB-07Pec.tdb: NB3B4_D7B, type code %, sha256 69bb1b9f802ec19a…

66: PHASE NB3B4_D7B % 2 3 4 !
67: CONST NB3B4_D7B : NB : B : !

NbB-08Wit.tdb: NB3B4_D7B, type code %, sha256 2bc2c38fb45e540c…

65: PHASE NB3B4_D7B % 2 3 4 !
66: CONST NB3B4_D7B : NB : B : !

NbB-08Yos.tdb: NB3B4_D7B, type code %, sha256 3dfd7add5bd6f596…

64: PHASE NB3B4_D7B % 2 3 4 !
65: CONST NB3B4_D7B : NB : B : !

NbB-09Nak.tdb: NB3B4_D7B, type code %, sha256 a5b39b98692d5b70…

66: PHASE NB3B4_D7B % 2 0.428 0.572 !
67: CONST NB3B4_D7B : NB : B : !

NbB-23Pan.tdb: NB3B4_D7B, type code %, sha256 71523b86a3d618ea…

66: PHASE NB3B4_D7B % 2 3 4 !
67: CONST NB3B4_D7B : NB : B : !

Example references (7 of 7; assessments first):

doi:10.1016/j.jallcom.2006.10.034 V.T. Witusiewicz, A.A. Bondar, U. Hecht, S. Rex, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 448, 185-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2006.10.054 Rockfeller Maciel Peçanha, Flávio Ferreira, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Bo Sundman, Thermodynamic modeling of the Nb–B system, Intermetallics 15, 999-1005 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2023.102602 Y. Pan, X. Yang, Z. Fan, A. Liu, J. Zhang, F. Luo, Y. Du, L. Huang, Calphad, 82, 102602(2023).
assessment that models this phase
doi:10.2320/matertrans.MC200820 Y. Nakama, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 50, 984-93(2009).
assessment that models this phase
doi:10.2355/isijinternational.48.835 K. Yoshitomi, Y. Nakama, H. Ohtani, M. Hasebe, ISIJ Int., 48, 835-44(2008).
assessment that models this phase
doi:10.1016/0364-5916(84)90026-9 L. Kaufman, B. Uhrenius, D. Birnie, K. Taylor, Calphad 8 (1984) 25–66.
cited as the source of values for this phase
doi:10.1007/bf00794439 A. V. Blinder, A. S. Bolgar, Heat capacity and enthalpy of transition-metal borides in a broad range of temperatures, Powder Metall Met Ceram 30, 1053-1056 (1991).
cited as the source of values for this phase

NB5B6 (B–Nb)

Id: phase:b-nb:nb5b6; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:models_disagree_on_composition; models_disagree_on_composition; no_structure_token
Candidate (literature_printed): V5B6 · oC22 — printed with a label mapped to this phase
Candidate (sgte_mmc2): V5B6 · oC22 · Cmmm (65) — Hallstedt 2025 mmc2 row for NB5B6: Nb5B6
Candidate (tdb_comment): V5B6 · oC22 · Cmmm — NbB-07Pec.tdb: 'Prototype V5B6 (oC22, Cmmm)'
Candidate (tdb_comment): V5B6 · oC22 · Cmmm — NbB-08Wit.tdb: 'Prototype V5B6 (oC22, Cmmm)'
Candidate (tdb_comment): V5B6 · oC22 · Cmmm — NbB-08Yos.tdb: 'Prototype V5B6 (oC22, Cmmm)'
Candidate (tdb_comment): V5B6 · oC22 · Cmmm — NbB-09Nak.tdb: 'Prototype V5B6 (oC22, Cmmm)'
Candidate (tdb_comment): V5B6 · oC22 · Cmmm — NbB-23Pan.tdb: 'Prototype V5B6 (oC22, Cmmm)'
Stability: stable in 5 of 5 calculated diagram(s): 300–3197.32 K, x(B) 0.545–0.54545
Literature: 9 values (9 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:b-nb:nb5b6
paper: paper:10.1016/j.intermet.2006.10.054:Nb5B6, paper:10.1016/j.jallcom.2006.10.034:Nb5B6
tdb: tdb:NbB-07Pec.tdb:NB5B6, tdb:NbB-08Wit.tdb:NB5B6, tdb:NbB-08Yos.tdb:NB5B6, tdb:NbB-09Nak.tdb:NB5B6, tdb:NbB-23Pan.tdb:NB5B6

TDB models of NB5B6 (5): PHASE and CONSTITUENT statements as written

NbB-07Pec.tdb: NB5B6, type code %, sha256 69bb1b9f802ec19a…

61: PHASE NB5B6 % 2 5 6 !
62: CONST NB5B6 : NB : B : !

NbB-08Wit.tdb: NB5B6, type code %, sha256 2bc2c38fb45e540c…

60: PHASE NB5B6 % 2 5 6 !
61: CONST NB5B6 : NB : B : !

NbB-08Yos.tdb: NB5B6, type code %, sha256 3dfd7add5bd6f596…

59: PHASE NB5B6 % 2 5 6 !
60: CONST NB5B6 : NB : B : !

NbB-09Nak.tdb: NB5B6, type code %, sha256 a5b39b98692d5b70…

61: PHASE NB5B6 % 2 0.455 0.545 !
62: CONST NB5B6 : NB : B : !

NbB-23Pan.tdb: NB5B6, type code %, sha256 71523b86a3d618ea…

61: PHASE NB5B6 % 2 5 6 !
62: CONST NB5B6 : NB : B : !

Example references (6 of 6; assessments first):

doi:10.1016/j.intermet.2006.10.054 Rockfeller Maciel Peçanha, Flávio Ferreira, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Bo Sundman, Thermodynamic modeling of the Nb–B system, Intermetallics 15, 999-1005 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2006.10.034 V.T. Witusiewicz, A.A. Bondar, U. Hecht, S. Rex, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 448, 185-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2023.102602 Y. Pan, X. Yang, Z. Fan, A. Liu, J. Zhang, F. Luo, Y. Du, L. Huang, Calphad, 82, 102602(2023).
assessment that models this phase
doi:10.2320/matertrans.MC200820 Y. Nakama, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 50, 984-93(2009).
assessment that models this phase
doi:10.2355/isijinternational.48.835 K. Yoshitomi, Y. Nakama, H. Ohtani, M. Hasebe, ISIJ Int., 48, 835-44(2008).
assessment that models this phase
doi:10.1016/0022-5088(90)90170-o H. Bolmgren, T. Lundström, A new binary boride, Nb5B6, Journal of the Less Common Metals 159, L25-L27 (1990).
cited as the source of values for this phase

NBB_B33 (B–Nb)

Id: phase:b-nb:nbb-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; 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_token_is_also_a_formula); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 5 of 5 calculated diagram(s): 300–3193.41 K, x(B) 0.47539–0.5
Literature: 18 values (18 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:b-nb:nbb-b33
paper: paper:10.1016/j.intermet.2006.10.054:NbB, paper:10.1016/j.jallcom.2006.10.034:NbB
tdb: tdb:NbB-07Pec.tdb:NBB_B33, tdb:NbB-08Wit.tdb:NBB_B33, tdb:NbB-08Yos.tdb:NBB_B33, tdb:NbB-09Nak.tdb:NBB_B33, tdb:NbB-23Pan.tdb:NBB_B33

TDB models of NBB_B33 (5): PHASE and CONSTITUENT statements as written

NbB-07Pec.tdb: NBB_B33, type code %, sha256 69bb1b9f802ec19a…

56: PHASE NBB_B33 % 2 1 1 !
57: CONST NBB_B33 : NB : B : !

NbB-08Wit.tdb: NBB_B33, type code %, sha256 2bc2c38fb45e540c…

55: PHASE NBB_B33 % 2 1 1 !
56: CONST NBB_B33 : NB : B% NB : !

NbB-08Yos.tdb: NBB_B33, type code %, sha256 3dfd7add5bd6f596…

54: PHASE NBB_B33 % 2 1 1 !
55: CONST NBB_B33 : NB : B : !

NbB-09Nak.tdb: NBB_B33, type code %, sha256 a5b39b98692d5b70…

56: PHASE NBB_B33 % 2 0.5 0.5 !
57: CONST NBB_B33 : NB : B : !

NbB-23Pan.tdb: NBB_B33, type code %, sha256 71523b86a3d618ea…

56: PHASE NBB_B33 % 2 1 1 !
57: CONST NBB_B33 : NB% VA : B% VA : !

Example references (7 of 7; assessments first):

doi:10.1016/j.jallcom.2006.10.034 V.T. Witusiewicz, A.A. Bondar, U. Hecht, S. Rex, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 448, 185-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2006.10.054 Rockfeller Maciel Peçanha, Flávio Ferreira, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Bo Sundman, Thermodynamic modeling of the Nb–B system, Intermetallics 15, 999-1005 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2023.102602 Y. Pan, X. Yang, Z. Fan, A. Liu, J. Zhang, F. Luo, Y. Du, L. Huang, Calphad, 82, 102602(2023).
assessment that models this phase
doi:10.2320/matertrans.MC200820 Y. Nakama, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 50, 984-93(2009).
assessment that models this phase
doi:10.2355/isijinternational.48.835 K. Yoshitomi, Y. Nakama, H. Ohtani, M. Hasebe, ISIJ Int., 48, 835-44(2008).
assessment that models this phase
doi:10.1016/0364-5916(84)90026-9 L. Kaufman, B. Uhrenius, D. Birnie, K. Taylor, Calphad 8 (1984) 25–66.
cited as the source of values for this phase
doi:10.1007/bf00794439 A. V. Blinder, A. S. Bolgar, Heat capacity and enthalpy of transition-metal borides in a broad range of temperatures, Powder Metall Met Ceram 30, 1053-1056 (1991).
cited as the source of values for this phase

NBB2_C32 (B–Nb)

Id: phase:b-nb:nbb2-c32; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:site_ratios_contradict_C32; site_ratios_contradict_C32:NbB-09Nak.tdb
Candidate (literature_printed): AlB2 · hP3 — printed with a label mapped to this phase
Candidate (name_token): AlB2 · C32 · hP3 · P6/mmm (191) — Strukturbericht/word 'C32' in the TDB name
Candidate (sgte_mmc2): AlB2 · C32 · hP3 · P6/mmm (191) — Hallstedt 2025 mmc2 row for NBB2_C32: NbB2
Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — NbB-07Pec.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — NbB-08Wit.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — NbB-08Yos.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — NbB-09Nak.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — NbB-23Pan.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
Stability: stable in 5 of 5 calculated diagram(s): 300–3320.66 K, x(B) 0.60952–0.72082
Literature: 15 values (15 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:b-nb:nbb2-c32
paper: paper:10.1016/j.intermet.2006.10.054:NbB2, paper:10.1016/j.jallcom.2006.10.034:NbB2
tdb: tdb:NbB-07Pec.tdb:NBB2_C32, tdb:NbB-08Wit.tdb:NBB2_C32, tdb:NbB-08Yos.tdb:NBB2_C32, tdb:NbB-09Nak.tdb:NBB2_C32, tdb:NbB-23Pan.tdb:NBB2_C32

TDB models of NBB2_C32 (5): PHASE and CONSTITUENT statements as written

NbB-07Pec.tdb: NBB2_C32, type code %, sha256 69bb1b9f802ec19a…

71: PHASE NBB2_C32 % 2 1 2 !
72: CONST NBB2_C32 : NB VA : B VA : !

NbB-08Wit.tdb: NBB2_C32, type code %, sha256 2bc2c38fb45e540c…

75: PHASE NBB2_C32 % 2 1 2 !
76: CONST NBB2_C32 : B NB% : B% NB : !

NbB-08Yos.tdb: NBB2_C32, type code %, sha256 3dfd7add5bd6f596…

74: PHASE NBB2_C32 % 2 1 2 !
75: CONST NBB2_C32 : NB VA : B VA : !

NbB-09Nak.tdb: NBB2_C32, type code %, sha256 a5b39b98692d5b70…

76: PHASE NBB2_C32 % 2 0.333 0.667 !
77: CONST NBB2_C32 : NB VA : B VA : !

NbB-23Pan.tdb: NBB2_C32, type code %, sha256 71523b86a3d618ea…

76: PHASE NBB2_C32 % 2 1 2 !
77: CONST NBB2_C32 : B NB% : B% NB : !

Example references (7 of 7; assessments first):

doi:10.1016/j.jallcom.2006.10.034 V.T. Witusiewicz, A.A. Bondar, U. Hecht, S. Rex, T.Ya. Velikanova, The Al–B–Nb–Ti system, Journal of Alloys and Compounds 448, 185-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2006.10.054 Rockfeller Maciel Peçanha, Flávio Ferreira, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Bo Sundman, Thermodynamic modeling of the Nb–B system, Intermetallics 15, 999-1005 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2023.102602 Y. Pan, X. Yang, Z. Fan, A. Liu, J. Zhang, F. Luo, Y. Du, L. Huang, Calphad, 82, 102602(2023).
assessment that models this phase
doi:10.2320/matertrans.MC200820 Y. Nakama, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 50, 984-93(2009).
assessment that models this phase
doi:10.2355/isijinternational.48.835 K. Yoshitomi, Y. Nakama, H. Ohtani, M. Hasebe, ISIJ Int., 48, 835-44(2008).
assessment that models this phase
doi:10.1016/0364-5916(84)90026-9 L. Kaufman, B. Uhrenius, D. Birnie, K. Taylor, Calphad 8 (1984) 25–66.
cited as the source of values for this phase
doi:10.1021/j100805a030 Edgar F. Westrum, NbB<sub>1.963</sub>: THE HEAT CAPACITY AND THERMODYNAMIC PROPERTIES FROM 5 TO 350°K., J. Phys. Chem. 67, 2385-2387 (1963).
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}
}