B–N phases

9 phases (tier A 1, liquid 2, gas 2, needs_review 4); 7 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–N system page · Markdown · field reference

Phases of the B–N system (9)
Phase	Structure	Basis	Stability (calculated)	TDB models
ALPHA_RHOMBO_B phase:b-n:b-alpha-rhombo		needs_review	stable in 1 of 1 calculated diagram(s): 300–1388 K, x(N) 0–0	1
BETA_RHOMBO_B phase:b-n:b-beta-rhombo		needs_review	stable in 1 of 1 calculated diagram(s): 1388–2376.26 K, x(N) 0–0	2
BN_B3 phase:b-n:bn-b3		needs_review	stable in 1 of 1 calculated diagram(s): 300–1855.12 K, x(N) 0.5–0.5	1
BN_B4 phase:b-n:bn-b4		needs_review	not stable in 1 calculated diagram(s)	1
BN_BK phase:b-n:bn-bk	BN · B_k · hP4 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1855.12–2777.04 K, x(N) 0.5–0.5	2
GAS phase:b-n:gas	gas	gas	stable in 1 of 1 calculated diagram(s): 300.12–4000 K, x(N) 0.64279–1	2
ION phase:b-n:ion	liquid	liquid	stable in 1 of 1 calculated diagram(s): 2344.76–4000 K, x(N) 0–0.01663	1
LIQUID phase:b-n:liquid	liquid	liquid	no calculated diagram	1
N2GAS phase:b-n:n2gas	gas	gas	stable in 1 of 1 calculated diagram(s): 300–2090.12 K, x(N) 1–1	2

ALPHA_RHOMBO_B (B–N)

Id: phase:b-n:b-alpha-rhombo; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:RHOMBO; no_structure_token
Candidate (sgte_mmc2): alpha-B · hR12 · R-3m (166) — Hallstedt 2025 mmc2 row for ALPHA_RHOMBO_B: Si_nB
Candidate (tdb_comment): alpha-B · hR12 · R-3m — BN-19Sri.tdb: 'Prototype alpha-B (hR12, R-3m)'
Stoichiometry: B 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1388 K, x(N) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-n:b-alpha-rhombo
tdb: tdb:BN-19Sri.tdb:ALPHA_RHOMBO_B

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

BN-19Sri.tdb: ALPHA_RHOMBO_B, type code %, sha256 d5a7851e9945cdc0…

40: PHASE ALPHA_RHOMBO_B % 1 1 !
41: CONST ALPHA_RHOMBO_B : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2019.03.008 S. Sridar, R. Kumar, K.C. Hari Kumar, Calphad, 65, 298-98(2019).
assessment that models this phase

BETA_RHOMBO_B (B–N)

Id: phase:b-n: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 — BN-19Sri.tdb: 'Prototype beta-B (hR105, R-3m)'
Candidate (tdb_comment): beta-B · hR105 · R-3m — BN-96Kas-LB.tdb: 'Prototype beta-B (hR105, R-3m)'
Stoichiometry: B 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 1388–2376.26 K, x(N) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-n:b-beta-rhombo
tdb: tdb:BN-19Sri.tdb:BETA_RHOMBO_B, tdb:BN-96Kas-LB.tdb:BETA_RHOMBO_B

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

BN-19Sri.tdb: BETA_RHOMBO_B, type code %, sha256 d5a7851e9945cdc0…

35: PHASE BETA_RHOMBO_B % 1 1 !
36: CONST BETA_RHOMBO_B : B : !

BN-96Kas-LB.tdb: BETA_RHOMBO_B, type code %, sha256 096fb32cd247bf91…

39: PHASE BETA_RHOMBO_B % 1 1 !
40: CONST BETA_RHOMBO_B : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2019.03.008 S. Sridar, R. Kumar, K.C. Hari Kumar, Calphad, 65, 298-98(2019).
assessment that models this phase

BN_B3 (B–N)

Id: phase:b-n:bn-b3; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; structure_token_is_also_a_formula
Candidate (dft_mp): P6_3/mmc (194) — on-hull MP BN at x(N)=0.5000
Candidate (dft_oqmd): P63/mmc (194) — on-hull OQMD B1 N1 at x(N)=0.5000
Candidate (sgte_mmc2): ZnS (sphalerite) · B3 · cF8 · F-43m (216) — Hallstedt 2025 mmc2 row for BN_B3: c-BN (metastable)
Candidate (tdb_comment): ZnS 3C · cF8 · F-43m — BN-19Sri.tdb: 'Prototype ZnS 3C (cF8, F-43m), metastable'
Stoichiometry: B 0.5000, N 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1855.12 K, x(N) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-n:bn-b3
tdb: tdb:BN-19Sri.tdb:BN_B3

TDB models of BN_B3 (1): PHASE and CONSTITUENT statements as written

BN-19Sri.tdb: BN_B3, type code %, sha256 d5a7851e9945cdc0…

50: PHASE BN_B3 % 2 1 1 !
51: CONST BN_B3 : B : N : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2019.03.008 S. Sridar, R. Kumar, K.C. Hari Kumar, Calphad, 65, 298-98(2019).
assessment that models this phase

BN_B4 (B–N)

Id: phase:b-n:bn-b4; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; structure_token_is_also_a_formula
Candidate (dft_mp): P6_3/mmc (194) — on-hull MP BN at x(N)=0.5000
Candidate (dft_oqmd): P63/mmc (194) — on-hull OQMD B1 N1 at x(N)=0.5000
Candidate (sgte_mmc2): ZnS (wurtzite) · B4 · hP4 · P6_3mc (186) — Hallstedt 2025 mmc2 row for BN_B4: w-BN (metastable)
Candidate (tdb_comment): ZnS 2H · hP4 · P6_3mc — BN-19Sri.tdb: 'Prototype ZnS 2H (hP4, P6_3mc), metastable'
Stoichiometry: B 0.5000, N 0.5000
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:b-n:bn-b4
tdb: tdb:BN-19Sri.tdb:BN_B4

TDB models of BN_B4 (1): PHASE and CONSTITUENT statements as written

BN-19Sri.tdb: BN_B4, type code %, sha256 d5a7851e9945cdc0…

55: PHASE BN_B4 % 2 1 1 !
56: CONST BN_B4 : B : N : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2019.03.008 S. Sridar, R. Kumar, K.C. Hari Kumar, Calphad, 65, 298-98(2019).
assessment that models this phase

BN_BK (B–N)

Id: phase:b-n:bn-bk; status assigned
Structure: BN · B_k · hP4 · P6_3/mmc (194); type st:b-k-bn-hp4; tier A: standard phase name; confidence high
Stoichiometry: B 0.5000, N 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 1855.12–2777.04 K, x(N) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-n:bn-bk
tdb: tdb:BN-19Sri.tdb:BN_BK, tdb:BN-96Kas-LB.tdb:BN_BK

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

BN-19Sri.tdb: BN_BK, type code %, sha256 d5a7851e9945cdc0…

45: PHASE BN_BK % 2 1 1 !
46: CONST BN_BK : B : N : !

BN-96Kas-LB.tdb: BN_BK, type code %, sha256 096fb32cd247bf91…

44: PHASE BN_BK % 2 1 1 !
45: CONST BN_BK : B : N : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2019.03.008 S. Sridar, R. Kumar, K.C. Hari Kumar, Calphad, 65, 298-98(2019).
assessment that models this phase

GAS (B–N)

Id: phase:b-n:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300.12–4000 K, x(N) 0.64279–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-n:gas
tdb: tdb:BN-19Sri.tdb:GAS, tdb:BN-96Kas-LB.tdb:GAS

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

BN-19Sri.tdb: GAS, type code %, sha256 d5a7851e9945cdc0…

58: PHASE GAS:G % 1 1 !
59: CONST GAS:G : B B2 BN N N2 N3 : !

BN-96Kas-LB.tdb: GAS, type code %, sha256 096fb32cd247bf91…

47: PHASE GAS:G % 1 1 !
48: CONST GAS:G : B B2 BN N N2 N3 : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2019.03.008 S. Sridar, R. Kumar, K.C. Hari Kumar, Calphad, 65, 298-98(2019).
assessment that models this phase

ION (B–N)

Id: phase:b-n:ion; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 2344.76–4000 K, x(N) 0–0.01663
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-n:ion
tdb: tdb:BN-19Sri.tdb:ION

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

BN-19Sri.tdb: ION, type code %, sha256 d5a7851e9945cdc0…

30: PHASE ION:Y % 2 1 1 !
31: CONST ION:Y : B+3 : VA BN N : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2019.03.008 S. Sridar, R. Kumar, K.C. Hari Kumar, Calphad, 65, 298-98(2019).
assessment that models this phase

LIQUID (B–N)

Id: phase:b-n:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: no calculated diagram
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-n:liquid
tdb: tdb:BN-96Kas-LB.tdb:LIQUID

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

BN-96Kas-LB.tdb: LIQUID, type code %, sha256 096fb32cd247bf91…

34: PHASE LIQUID:L % 1 1 !
35: CONST LIQUID:L : B N : !

N2GAS (B–N)

Id: phase:b-n:n2gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2090.12 K, x(N) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-n:n2gas
tdb: tdb:BN-19Sri.tdb:N2GAS, tdb:BN-96Kas-LB.tdb:N2GAS

TDB models of N2GAS (2): PHASE and CONSTITUENT statements as written

BN-19Sri.tdb: N2GAS, type code %, sha256 d5a7851e9945cdc0…

61: PHASE N2GAS % 1 1 !
62: CONST N2GAS : N2 : !

BN-96Kas-LB.tdb: N2GAS, type code %, sha256 096fb32cd247bf91…

50: PHASE N2GAS % 1 1 !
51: CONST N2GAS : N2 : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2019.03.008 S. Sridar, R. Kumar, K.C. Hari Kumar, Calphad, 65, 298-98(2019).
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}
}