N–Nb phases

5 phases (tier A 2, liquid 1, gas 1, interstitial_fcc_a1_compound 1); 5 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: interactive registry · full JSON · N–Nb system page · Markdown · field reference

Phases of the N–Nb system (5)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:n-nb:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2767.09 K, x(N) 0–0.20934	0	3
FCC_A1 phase:n-nb:fcc-a1	NaCl · B1 · cF8 · Fm-3m (225)	assigned	stable in 3 of 3 calculated diagram(s): 300–2350 K, x(N) 0.40025–0.5	0	3
HCP_A3 phase:n-nb:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2858.19 K, x(N) 0.2947–0.33333	0	3
LIQUID phase:n-nb:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 2688.39–4000 K, x(N) 0–0.24595	3	3
N2GAS phase:n-nb:n2gas	gas	gas	stable in 3 of 3 calculated diagram(s): 300–4000 K, x(N) 1–1	0	3

BCC_A2 (N–Nb)

Id: phase:n-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 3 of 3 calculated diagram(s): 300–2767.09 K, x(N) 0–0.20934
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:n-nb:bcc-a2
tdb: tdb:NbN-09Hal.tdb:BCC_A2, tdb:NbN-13Khv.tdb:BCC_A2, tdb:NbN-96Hua-LB.tdb:BCC_A2

TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written

NbN-09Hal.tdb: BCC_A2, type code %B, sha256 bf2dd17a6932b77d…

37: PHASE BCC_A2 %B 2 1 1 !
38: CONST BCC_A2 : NB% : N VA% : !

NbN-13Khv.tdb: BCC_A2, type code %B, sha256 b1c67a6776138cb9…

38: PHASE BCC_A2 %B 2 1 3 !
39: CONST BCC_A2 : NB% : N VA% : !

NbN-96Hua-LB.tdb: BCC_A2, type code %B, sha256 e10e5bfc05a45030…

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

Example references (3 of 3; assessments first):

doi:10.1007/BF02595450 W. Huang, Metall. Mater. Trans. A, 27A, 3591-3600(1996).
assessment that models this phase
doi:10.1016/j.calphad.2008.09.013 Bengt Hallstedt, Dejan Djurovic, Modelling of interstitials in the bcc phase, Calphad 33, 233-236 (2009).
assessment that models this phase
doi:10.1016/j.calphad.2012.11.001 A.V. Khvan, B. Hallstedt, Calphad, 40, 10-15(2013).
assessment that models this phase

FCC_A1 (N–Nb)

Id: phase:n-nb:fcc-a1; status assigned
Structure: NaCl · B1 · cF8 · Fm-3m (225); type st:b1-nacl-cf8; interstitial_fcc_a1_compound; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 300–2350 K, x(N) 0.40025–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:n-nb:fcc-a1
tdb: tdb:NbN-09Hal.tdb:FCC_A1, tdb:NbN-13Khv.tdb:FCC_A1, tdb:NbN-96Hua-LB.tdb:FCC_A1

TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written

NbN-09Hal.tdb: FCC_A1, type code %A, sha256 bf2dd17a6932b77d…

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

NbN-13Khv.tdb: FCC_A1, type code %A, sha256 b1c67a6776138cb9…

33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : NB : N VA% : !

NbN-96Hua-LB.tdb: FCC_A1, type code %A, sha256 e10e5bfc05a45030…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : NB : N VA% : !

Example references (3 of 3; assessments first):

doi:10.1007/BF02595450 W. Huang, Metall. Mater. Trans. A, 27A, 3591-3600(1996).
assessment that models this phase
doi:10.1016/j.calphad.2008.09.013 Bengt Hallstedt, Dejan Djurovic, Modelling of interstitials in the bcc phase, Calphad 33, 233-236 (2009).
assessment that models this phase
doi:10.1016/j.calphad.2012.11.001 A.V. Khvan, B. Hallstedt, Calphad, 40, 10-15(2013).
assessment that models this phase

HCP_A3 (N–Nb)

Id: phase:n-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 3 of 3 calculated diagram(s): 300–2858.19 K, x(N) 0.2947–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:n-nb:hcp-a3
tdb: tdb:NbN-09Hal.tdb:HCP_A3, tdb:NbN-13Khv.tdb:HCP_A3, tdb:NbN-96Hua-LB.tdb:HCP_A3

TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written

NbN-09Hal.tdb: HCP_A3, type code %A, sha256 bf2dd17a6932b77d…

42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : NB : N VA% : !

NbN-13Khv.tdb: HCP_A3, type code %A, sha256 b1c67a6776138cb9…

43: PHASE HCP_A3 %A 2 1 0.5 !
44: CONST HCP_A3 : NB : N VA% : !

NbN-96Hua-LB.tdb: HCP_A3, type code %A, sha256 e10e5bfc05a45030…

42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : NB : N VA% : !

Example references (3 of 3; assessments first):

doi:10.1007/BF02595450 W. Huang, Metall. Mater. Trans. A, 27A, 3591-3600(1996).
assessment that models this phase
doi:10.1016/j.calphad.2008.09.013 Bengt Hallstedt, Dejan Djurovic, Modelling of interstitials in the bcc phase, Calphad 33, 233-236 (2009).
assessment that models this phase
doi:10.1016/j.calphad.2012.11.001 A.V. Khvan, B. Hallstedt, Calphad, 40, 10-15(2013).
assessment that models this phase

LIQUID (N–Nb)

Id: phase:n-nb:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 2688.39–4000 K, x(N) 0–0.24595
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:n-nb:liquid
paper: paper:10.1007/bf02595450:liquid
tdb: tdb:NbN-09Hal.tdb:LIQUID, tdb:NbN-13Khv.tdb:LIQUID, tdb:NbN-96Hua-LB.tdb:LIQUID

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

NbN-09Hal.tdb: LIQUID, type code %, sha256 bf2dd17a6932b77d…

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

NbN-13Khv.tdb: LIQUID, type code %, sha256 b1c67a6776138cb9…

28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : N NB : !

NbN-96Hua-LB.tdb: LIQUID, type code %, sha256 e10e5bfc05a45030…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : N NB : !

Example references (4 of 4; assessments first):

doi:10.1007/BF02595450 W. Huang, Metall. Mater. Trans. A, 27A, 3591-3600(1996).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2008.09.013 Bengt Hallstedt, Dejan Djurovic, Modelling of interstitials in the bcc phase, Calphad 33, 233-236 (2009).
assessment that models this phase
doi:10.1016/j.calphad.2012.11.001 A.V. Khvan, B. Hallstedt, Calphad, 40, 10-15(2013).
assessment that models this phase
doi:10.1002/zaac.19251430121 Ernst Friederich, Lieselotte Sittig, Herstellung und Eigenschaften von Nitriden, Z. Anorg. Allg. Chem. 143, 293-320 (1925).
cited as the source of values for this phase

N2GAS (N–Nb)

Id: phase:n-nb:n2gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 300–4000 K, x(N) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:n-nb:n2gas
tdb: tdb:NbN-09Hal.tdb:N2GAS, tdb:NbN-13Khv.tdb:N2GAS, tdb:NbN-96Hua-LB.tdb:N2GAS

TDB models of N2GAS (3): PHASE and CONSTITUENT statements as written

NbN-09Hal.tdb: N2GAS, type code %, sha256 bf2dd17a6932b77d…

45: PHASE N2GAS % 1 1 !
46: CONST N2GAS : N2 : !

NbN-13Khv.tdb: N2GAS, type code %, sha256 b1c67a6776138cb9…

46: PHASE N2GAS % 1 1 !
47: CONST N2GAS : N2 : !

NbN-96Hua-LB.tdb: N2GAS, type code %, sha256 e10e5bfc05a45030…

45: PHASE N2GAS % 1 1 !
46: CONST N2GAS : N2 : !

Example references (3 of 3; assessments first):

doi:10.1007/BF02595450 W. Huang, Metall. Mater. Trans. A, 27A, 3591-3600(1996).
assessment that models this phase
doi:10.1016/j.calphad.2008.09.013 Bengt Hallstedt, Dejan Djurovic, Modelling of interstitials in the bcc phase, Calphad 33, 233-236 (2009).
assessment that models this phase
doi:10.1016/j.calphad.2012.11.001 A.V. Khvan, B. Hallstedt, Calphad, 40, 10-15(2013).
assessment that models this phase

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735970
R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23736065

Also cite B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work). Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

@misc{orchid_phase_registry_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Registry: phase registry of binary systems}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735970},
  url       = {https://doi.org/10.5281/zenodo.23735970},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}