Mn–N phases

11 phases (tier A 5, tier C 3, liquid 1, gas 2); 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 · Mn–N system page · Markdown · field reference

Phases of the Mn–N system (11)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:mn-n:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1411.01–2338.99 K, x(N) 0–0.002	2
CBCC_A12 phase:mn-n:cbcc-a12	alpha-Mn · A12 · cI58 · I-43m (217)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–980 K, x(N) 0–0.00444	2
CUB_A13 phase:mn-n:cub-a13	beta-Mn · A13 · cP20 · P4_132 (213)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 917.97–1359.99 K, x(N) 0–0.01943	2
FCC_A1 phase:mn-n:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 877.81–1553.65 K, x(N) 0–0.10717	2
GAS phase:mn-n:gas	gas	gas	stable in 2 of 2 calculated diagram(s): 301.1–2500 K, x(N) 0–1	2
HCP_A3 phase:mn-n:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 660.97–1557.04 K, x(N) 0.11542–0.29067	2
FE4N_L1 phase:mn-n:l1-fe4n	Fe4N · L'1 · cP5 · Pm-3m (221)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1157.66 K, x(N) 0.19295–0.2	2
LIQUID phase:mn-n:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 1511.65–2339.67 K, x(N) 0–0.09846	2
MN3N2 phase:mn-n:mn3n2	Mn3N2 · tI10 · I4/mmm (139)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–973.51 K, x(N) 0.4–0.4	2
MN6N5 phase:mn-n:mn6n5	CoO · tI4 · I4/mmm (139)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–863.6 K, x(N) 0.45455–0.45455	2
N2GAS phase:mn-n:n2gas	gas	gas	stable in 2 of 2 calculated diagram(s): 300–1038.51 K, x(N) 1–1	2

BCC_A2 (Mn–N)

Id: phase:mn-n: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 2 of 2 calculated diagram(s): 1411.01–2338.99 K, x(N) 0–0.002
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-n:bcc-a2
tdb: tdb:MnN-93Qiu-LB.tdb:BCC_A2, tdb:MnN-93Qiu-mod.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

MnN-93Qiu-LB.tdb: BCC_A2, type code %B, sha256 0c328a820056ada5…

40: PHASE BCC_A2 %B 2 1 3 !
41: CONST BCC_A2 : MN : N VA% : !

MnN-93Qiu-mod.tdb: BCC_A2, type code %B, sha256 49cec951bb033560…

45: PHASE BCC_A2 %B 2 1 3 !
46: CONST BCC_A2 : MN : N VA% : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1993-840103 C. Qiu, A. Fernandez Guillermet, Z. Metallkd., 84, 11-22(1993).
assessment that models this phase

CBCC_A12 (Mn–N)

Id: phase:mn-n:cbcc-a12; status assigned
Structure: alpha-Mn · A12 · cI58 · I-43m (217); type st:a12-alpha-mn-ci58; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–980 K, x(N) 0–0.00444
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-n:cbcc-a12
tdb: tdb:MnN-93Qiu-LB.tdb:CBCC_A12, tdb:MnN-93Qiu-mod.tdb:CBCC_A12

TDB models of CBCC_A12 (2): PHASE and CONSTITUENT statements as written

MnN-93Qiu-LB.tdb: CBCC_A12, type code %A, sha256 0c328a820056ada5…

50: PHASE CBCC_A12 %A 2 1 1 !
51: CONST CBCC_A12 : MN : N VA% : !

MnN-93Qiu-mod.tdb: CBCC_A12, type code %A, sha256 49cec951bb033560…

55: PHASE CBCC_A12 %A 2 1 1 !
56: CONST CBCC_A12 : MN : N VA% : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1993-840103 C. Qiu, A. Fernandez Guillermet, Z. Metallkd., 84, 11-22(1993).
assessment that models this phase

CUB_A13 (Mn–N)

Id: phase:mn-n:cub-a13; status assigned
Structure: beta-Mn · A13 · cP20 · P4_132 (213); type st:a13-beta-mn-cp20; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 917.97–1359.99 K, x(N) 0–0.01943
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-n:cub-a13
tdb: tdb:MnN-93Qiu-LB.tdb:CUB_A13, tdb:MnN-93Qiu-mod.tdb:CUB_A13

TDB models of CUB_A13 (2): PHASE and CONSTITUENT statements as written

MnN-93Qiu-LB.tdb: CUB_A13, type code %, sha256 0c328a820056ada5…

55: PHASE CUB_A13 % 2 1 1 !
56: CONST CUB_A13 : MN : N VA% : !

MnN-93Qiu-mod.tdb: CUB_A13, type code %, sha256 49cec951bb033560…

60: PHASE CUB_A13 % 2 1 1 !
61: CONST CUB_A13 : MN : N VA% : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1993-840103 C. Qiu, A. Fernandez Guillermet, Z. Metallkd., 84, 11-22(1993).
assessment that models this phase

FCC_A1 (Mn–N)

Id: phase:mn-n: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 2 of 2 calculated diagram(s): 877.81–1553.65 K, x(N) 0–0.10717
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-n:fcc-a1
tdb: tdb:MnN-93Qiu-LB.tdb:FCC_A1, tdb:MnN-93Qiu-mod.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

MnN-93Qiu-LB.tdb: FCC_A1, type code %A, sha256 0c328a820056ada5…

35: PHASE FCC_A1 %A 2 1 1 !
36: CONST FCC_A1 : MN : N VA% : !

MnN-93Qiu-mod.tdb: FCC_A1, type code %A, sha256 49cec951bb033560…

40: PHASE FCC_A1 %A 2 1 1 !
41: CONST FCC_A1 : MN : N VA% : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1993-840103 C. Qiu, A. Fernandez Guillermet, Z. Metallkd., 84, 11-22(1993).
assessment that models this phase

GAS (Mn–N)

Id: phase:mn-n:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 301.1–2500 K, x(N) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-n:gas
tdb: tdb:MnN-93Qiu-LB.tdb:GAS, tdb:MnN-93Qiu-mod.tdb:GAS

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

MnN-93Qiu-LB.tdb: GAS, type code %, sha256 0c328a820056ada5…

73: PHASE GAS:G % 1 1 !
74: CONST GAS:G : MN N N2 N3 : !

MnN-93Qiu-mod.tdb: GAS, type code %, sha256 49cec951bb033560…

78: PHASE GAS:G % 1 1 !
79: CONST GAS:G : MN N N2 N3 : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1993-840103 C. Qiu, A. Fernandez Guillermet, Z. Metallkd., 84, 11-22(1993).
assessment that models this phase

HCP_A3 (Mn–N)

Id: phase:mn-n: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 2 of 2 calculated diagram(s): 660.97–1557.04 K, x(N) 0.11542–0.29067
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-n:hcp-a3
tdb: tdb:MnN-93Qiu-LB.tdb:HCP_A3, tdb:MnN-93Qiu-mod.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

MnN-93Qiu-LB.tdb: HCP_A3, type code %A, sha256 0c328a820056ada5…

45: PHASE HCP_A3 %A 2 1 0.5 !
46: CONST HCP_A3 : MN : N VA% : !

MnN-93Qiu-mod.tdb: HCP_A3, type code %A, sha256 49cec951bb033560…

50: PHASE HCP_A3 %A 2 1 0.5 !
51: CONST HCP_A3 : MN : N VA% : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1993-840103 C. Qiu, A. Fernandez Guillermet, Z. Metallkd., 84, 11-22(1993).
assessment that models this phase

FE4N_L1 (Mn–N)

Id: phase:mn-n:l1-fe4n; status assigned
Structure: Fe4N · L'1 · cP5 · Pm-3m (221); type st:l-1-fe4n-cp5; 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 (name_has_descriptive_tokens:FE4N,L1, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 2 of 2 calculated diagram(s): 300–1157.66 K, x(N) 0.19295–0.2
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-n:l1-fe4n
tdb: tdb:MnN-93Qiu-LB.tdb:FE4N_L1, tdb:MnN-93Qiu-mod.tdb:FE4N_L1

TDB models of FE4N_L1 (2): PHASE and CONSTITUENT statements as written

MnN-93Qiu-LB.tdb: FE4N_L1, type code %, sha256 0c328a820056ada5…

60: PHASE FE4N_L1 % 2 4 1 !
61: CONST FE4N_L1 : MN : N :!

MnN-93Qiu-mod.tdb: FE4N_L1, type code %, sha256 49cec951bb033560…

65: PHASE FE4N_L1 % 2 4 1 !
66: CONST FE4N_L1 : MN : N% VA :!

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1993-840103 C. Qiu, A. Fernandez Guillermet, Z. Metallkd., 84, 11-22(1993).
assessment that models this phase

LIQUID (Mn–N)

Id: phase:mn-n:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1511.65–2339.67 K, x(N) 0–0.09846
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-n:liquid
tdb: tdb:MnN-93Qiu-LB.tdb:LIQUID, tdb:MnN-93Qiu-mod.tdb:LIQUID

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

MnN-93Qiu-LB.tdb: LIQUID, type code %, sha256 0c328a820056ada5…

30: PHASE LIQUID:L % 1 1 !
31: CONST LIQUID:L : MN N : !

MnN-93Qiu-mod.tdb: LIQUID, type code %, sha256 49cec951bb033560…

35: PHASE LIQUID:L % 1 1 !
36: CONST LIQUID:L : MN N : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1993-840103 C. Qiu, A. Fernandez Guillermet, Z. Metallkd., 84, 11-22(1993).
assessment that models this phase

MN3N2 (Mn–N)

Id: phase:mn-n:mn3n2; status assigned
Structure: Mn3N2 · tI10 · I4/mmm (139); type st:mn3n2-ti10; 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_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Mn 0.6000, N 0.4000
Stability: stable in 2 of 2 calculated diagram(s): 300–973.51 K, x(N) 0.4–0.4
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-n:mn3n2
tdb: tdb:MnN-93Qiu-LB.tdb:MN3N2, tdb:MnN-93Qiu-mod.tdb:MN3N2

TDB models of MN3N2 (2): PHASE and CONSTITUENT statements as written

MnN-93Qiu-LB.tdb: MN3N2, type code %, sha256 0c328a820056ada5…

65: PHASE MN3N2 % 2 3 2 !
66: CONST MN3N2 : MN : N :!

MnN-93Qiu-mod.tdb: MN3N2, type code %, sha256 49cec951bb033560…

70: PHASE MN3N2 % 2 3 2 !
71: CONST MN3N2 : MN : N :!

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1993-840103 C. Qiu, A. Fernandez Guillermet, Z. Metallkd., 84, 11-22(1993).
assessment that models this phase

MN6N5 (Mn–N)

Id: phase:mn-n:mn6n5; status assigned
Structure: CoO · tI4 · I4/mmm (139); type st:coo-ti4; 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_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Mn 0.5455, N 0.4545
Stability: stable in 2 of 2 calculated diagram(s): 300–863.6 K, x(N) 0.45455–0.45455
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-n:mn6n5
tdb: tdb:MnN-93Qiu-LB.tdb:MN6N5, tdb:MnN-93Qiu-mod.tdb:MN6N5

TDB models of MN6N5 (2): PHASE and CONSTITUENT statements as written

MnN-93Qiu-LB.tdb: MN6N5, type code %, sha256 0c328a820056ada5…

70: PHASE MN6N5 % 2 6 5 !
71: CONST MN6N5 : MN : N :!

MnN-93Qiu-mod.tdb: MN6N5, type code %, sha256 49cec951bb033560…

75: PHASE MN6N5 % 2 6 5 !
76: CONST MN6N5 : MN : N :!

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1993-840103 C. Qiu, A. Fernandez Guillermet, Z. Metallkd., 84, 11-22(1993).
assessment that models this phase

N2GAS (Mn–N)

Id: phase:mn-n:n2gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–1038.51 K, x(N) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-n:n2gas
tdb: tdb:MnN-93Qiu-LB.tdb:N2GAS, tdb:MnN-93Qiu-mod.tdb:N2GAS

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

MnN-93Qiu-LB.tdb: N2GAS, type code %, sha256 0c328a820056ada5…

76: PHASE N2GAS % 1 1 !
77: CONST N2GAS : N2 : !

MnN-93Qiu-mod.tdb: N2GAS, type code %, sha256 49cec951bb033560…

81: PHASE N2GAS % 1 1 !
82: CONST N2GAS : N2 : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1993-840103 C. Qiu, A. Fernandez Guillermet, Z. Metallkd., 84, 11-22(1993).
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}
}