Mg–Ni phases

7 phases (tier A 5, liquid 1, needs_review 1); 6 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 · Mg–Ni system page · Markdown · field reference

Phases of the Mg–Ni system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:mg-ni:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
C36_LAVES phase:mg-ni:c36-laves	MgNi2 · C36 · hP24 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1420.57 K, x(Ni) 0.662–0.67341	40	3
FCC_A1 phase:mg-ni:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2499.49 K, x(Ni) 0.99846–1	9	3
HCP_A3 phase:mg-ni:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–926.54 K, x(Ni) 0–1e-05	5	3
LIQUID phase:mg-ni:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 780–2500 K, x(Ni) 0–1	35	3
MG2NI phase:mg-ni:mg2ni		needs_review	stable in 2 of 2 calculated diagram(s): 300–1032.32 K, x(Ni) 0.33333–0.33333	36	2
MG2NI_CA phase:mg-ni:mg2ni-ca	Mg2Ni · C_a · hP18 · P6_222 (180)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1030.66 K, x(Ni) 0.33333–0.33333	8	1

BCC_A2 (Mg–Ni)

Id: phase:mg-ni:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: not stable in 3 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:mg-ni:bcc-a2
tdb: tdb:MgNi-05Isl.tdb:BCC_A2, tdb:MgNi-98Jac-2.tdb:BCC_A2, tdb:MgNi-98Jac-LB.tdb:BCC_A2

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

MgNi-05Isl.tdb: BCC_A2, type code %B, sha256 452d7faaa3e14191…

45: PHASE BCC_A2 %B 2 1 3 !
46: CONST BCC_A2 : MG NI : VA : !

MgNi-98Jac-2.tdb: BCC_A2, type code %B, sha256 a7597b0f81c491cc…

44: PHASE BCC_A2 %B 2 1 3 !
45: CONST BCC_A2 : MG NI : VA : !

MgNi-98Jac-LB.tdb: BCC_A2, type code %B, sha256 c65d409d16032b0a…

38: PHASE BCC_A2 %B 2 1 3 !
39: CONST BCC_A2 : MG NI : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2005.08.006 F. Islam, M. Medraj, The phase equilibria in the Mg–Ni–Ca system, Calphad 29, 289-302 (2005).
assessment that models this phase
doi:10.1016/S0364-5916(99)00008-5 M.H.G. Jacobs, P.J. Spencer, Calphad, 22, 513-25(1998).
assessment that models this phase

C36_LAVES (Mg–Ni)

Id: phase:mg-ni: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 MgNi-05Isl.tdb also describes the disordered state
Caveat: partitioned order/disorder model in MgNi-98Jac-2.tdb also describes the disordered state
Caveat: partitioned order/disorder model in MgNi-98Jac-LB.tdb also describes the disordered state
Stability: stable in 3 of 3 calculated diagram(s): 300–1420.57 K, x(Ni) 0.662–0.67341
Literature: 40 values (40 accepted) from 3 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:mg-ni:c36-laves
paper: paper:10.1016/j.calphad.2005.08.006:Mg-hcp, paper:10.1016/j.calphad.2005.08.006:MgNi2, paper:10.1016/s0364-5916(99)00008-5:MgNi2, paper:sha256-85fd53a1a176b694:Laves-C36, paper:sha256-85fd53a1a176b694:MgNi2
tdb: tdb:MgNi-05Isl.tdb:C36_LAVES, tdb:MgNi-98Jac-2.tdb:C36_LAVES, tdb:MgNi-98Jac-LB.tdb:C36_LAVES

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

MgNi-05Isl.tdb: C36_LAVES, type code %, sha256 452d7faaa3e14191…

55: PHASE C36_LAVES % 2 2 1 !
56: CONST C36_LAVES : MG NI% : MG% NI : !

MgNi-98Jac-2.tdb: C36_LAVES, type code %, sha256 a7597b0f81c491cc…

54: PHASE C36_LAVES % 2 2 1 !
55: CONST C36_LAVES : MG NI% : MG% NI : !

MgNi-98Jac-LB.tdb: C36_LAVES, type code %, sha256 c65d409d16032b0a…

48: PHASE C36_LAVES % 2 2 1 !
49: CONST C36_LAVES : MG NI% : MG% NI : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2005.08.006 F. Islam, M. Medraj, The phase equilibria in the Mg–Ni–Ca system, Calphad 29, 289-302 (2005).
assessment that models this phase; reports values for this phase
doi:10.1016/S0364-5916(99)00008-5 M.H.G. Jacobs, P.J. Spencer, Calphad, 22, 513-25(1998).
assessment that models this phase; reports values for this phase
doi:10.1002/zaac.19080570103 G. Voss, Die Legierungen: Nickel‐Zinn, Nickel‐Blei, Nickel‐Thallium, Nickel‐Wismut, Nickel‐Chrom, Nickel‐Magnesium, Nickel‐Zink und Nickel‐Cadmium, Z. Anorg. Chem. 57, 34-71 (1908).
cited as the source of values for this phase

FCC_A1 (Mg–Ni)

Id: phase:mg-ni: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 3 of 3 calculated diagram(s): 300–2499.49 K, x(Ni) 0.99846–1
Literature: 9 values (9 accepted) from 3 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:mg-ni:fcc-a1
paper: paper:10.1016/j.calphad.2005.08.006:Ni-fcc, paper:10.1016/s0364-5916(99)00008-5:Fcc_A1, paper:sha256-85fd53a1a176b694:fcc-A1
tdb: tdb:MgNi-05Isl.tdb:FCC_A1, tdb:MgNi-98Jac-2.tdb:FCC_A1, tdb:MgNi-98Jac-LB.tdb:FCC_A1

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

MgNi-05Isl.tdb: FCC_A1, type code %A, sha256 452d7faaa3e14191…

40: PHASE FCC_A1 %A 2 1 1 !
41: CONST FCC_A1 : MG NI% : VA : !

MgNi-98Jac-2.tdb: FCC_A1, type code %A, sha256 a7597b0f81c491cc…

39: PHASE FCC_A1 %A 2 1 1 !
40: CONST FCC_A1 : MG NI% : VA : !

MgNi-98Jac-LB.tdb: FCC_A1, type code %A, sha256 c65d409d16032b0a…

33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : MG NI% : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/S0364-5916(99)00008-5 M.H.G. Jacobs, P.J. Spencer, Calphad, 22, 513-25(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2005.08.006 F. Islam, M. Medraj, The phase equilibria in the Mg–Ni–Ca system, Calphad 29, 289-302 (2005).
assessment that models this phase; reports values for this phase
doi:10.1002/zaac.19080570103 G. Voss, Die Legierungen: Nickel‐Zinn, Nickel‐Blei, Nickel‐Thallium, Nickel‐Wismut, Nickel‐Chrom, Nickel‐Magnesium, Nickel‐Zink und Nickel‐Cadmium, Z. Anorg. Chem. 57, 34-71 (1908).
cited as the source of values for this phase

HCP_A3 (Mg–Ni)

Id: phase:mg-ni: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): 300–926.54 K, x(Ni) 0–1e-05
Literature: 5 values (5 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:mg-ni:hcp-a3
paper: paper:10.1016/s0364-5916(99)00008-5:Hcp_A3, paper:sha256-85fd53a1a176b694:hcp-A3
tdb: tdb:MgNi-05Isl.tdb:HCP_A3, tdb:MgNi-98Jac-2.tdb:HCP_A3, tdb:MgNi-98Jac-LB.tdb:HCP_A3

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

MgNi-05Isl.tdb: HCP_A3, type code %A, sha256 452d7faaa3e14191…

50: PHASE HCP_A3 %A 2 1 0.5 !
51: CONST HCP_A3 : MG% NI : VA : !

MgNi-98Jac-2.tdb: HCP_A3, type code %A, sha256 a7597b0f81c491cc…

49: PHASE HCP_A3 %A 2 1 0.5 !
50: CONST HCP_A3 : MG% NI : VA : !

MgNi-98Jac-LB.tdb: HCP_A3, type code %A, sha256 c65d409d16032b0a…

43: PHASE HCP_A3 %A 2 1 0.5 !
44: CONST HCP_A3 : MG% NI : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/S0364-5916(99)00008-5 M.H.G. Jacobs, P.J. Spencer, Calphad, 22, 513-25(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2005.08.006 F. Islam, M. Medraj, The phase equilibria in the Mg–Ni–Ca system, Calphad 29, 289-302 (2005).
assessment that models this phase

LIQUID (Mg–Ni)

Id: phase:mg-ni:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 780–2500 K, x(Ni) 0–1
Literature: 35 values (35 accepted) from 3 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:mg-ni:liquid
paper: paper:10.1016/j.calphad.2005.08.006:L, paper:10.1016/s0364-5916(99)00008-5:L, paper:sha256-85fd53a1a176b694:Liquid
tdb: tdb:MgNi-05Isl.tdb:LIQUID, tdb:MgNi-98Jac-2.tdb:LIQUID, tdb:MgNi-98Jac-LB.tdb:LIQUID

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

MgNi-05Isl.tdb: LIQUID, type code %, sha256 452d7faaa3e14191…

35: PHASE LIQUID:L % 1 1 !
36: CONST LIQUID:L : MG NI : !

MgNi-98Jac-2.tdb: LIQUID, type code %, sha256 a7597b0f81c491cc…

34: PHASE LIQUID:L % 1 1 !
35: CONST LIQUID:L : MG NI : !

MgNi-98Jac-LB.tdb: LIQUID, type code %, sha256 c65d409d16032b0a…

28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : MG NI : !

Example references (3 of 3; assessments first):

doi:10.1016/S0364-5916(99)00008-5 M.H.G. Jacobs, P.J. Spencer, Calphad, 22, 513-25(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2005.08.006 F. Islam, M. Medraj, The phase equilibria in the Mg–Ni–Ca system, Calphad 29, 289-302 (2005).
assessment that models this phase; reports values for this phase
doi:10.1002/zaac.19080570103 G. Voss, Die Legierungen: Nickel‐Zinn, Nickel‐Blei, Nickel‐Thallium, Nickel‐Wismut, Nickel‐Chrom, Nickel‐Magnesium, Nickel‐Zink und Nickel‐Cadmium, Z. Anorg. Chem. 57, 34-71 (1908).
cited as the source of values for this phase

MG2NI (Mg–Ni)

Id: phase:mg-ni:mg2ni; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition
Candidate (dft_mp): P6_222 (180) — on-hull MP Mg2Ni at x(NI)=0.3333
Candidate (dft_oqmd): Fddd (70) — on-hull OQMD Mg2 Ni1 at x(NI)=0.3333
Candidate (tdb_comment): Mg2Ni · hP18 · P6_222 — MgNi-98Jac-2.tdb: 'Prototype Mg2Ni (hP18, P6_222)'
Candidate (tdb_comment): Mg2Ni · hP18 · P6_222 — MgNi-98Jac-LB.tdb: 'Prototype Mg2Ni (hP18, P6_222)'
Stoichiometry: Mg 0.6667, Ni 0.3333
Stability: stable in 2 of 2 calculated diagram(s): 300–1032.32 K, x(Ni) 0.33333–0.33333
Literature: 36 values (36 accepted) from 3 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:mg-ni:mg2ni
paper: paper:10.1016/j.calphad.2005.08.006:Mg2Ni, paper:10.1016/s0364-5916(99)00008-5:Mg2Ni, paper:sha256-85fd53a1a176b694:Mg2Ni
tdb: tdb:MgNi-98Jac-2.tdb:MG2NI, tdb:MgNi-98Jac-LB.tdb:MG2NI

TDB models of MG2NI (2): PHASE and CONSTITUENT statements as written

MgNi-98Jac-2.tdb: MG2NI, type code %, sha256 a7597b0f81c491cc…

59: PHASE MG2NI % 2 2 1 !
60: CONST MG2NI : MG : NI : !

MgNi-98Jac-LB.tdb: MG2NI, type code %, sha256 c65d409d16032b0a…

53: PHASE MG2NI % 2 2 1 !
54: CONST MG2NI : MG : NI : !

Example references (5 of 5; assessments first):

doi:10.1016/S0364-5916(99)00008-5 M.H.G. Jacobs, P.J. Spencer, Calphad, 22, 513-25(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2005.08.006 F. Islam, M. Medraj, The phase equilibria in the Mg–Ni–Ca system, Calphad 29, 289-302 (2005).
reports values for this phase
doi:10.1016/0001-6160(60)90188-7 J.F Smith, J.L Christian, Thermodynamics of formation of coppermagnesium and nickelmagnesium compounds from vapor pressure measurements, Acta Metallurgica 8, 249-255 (1960).
cited as the source of values for this phase
doi:10.1016/0001-6160(64)90056-2 R.C King, O.J Kleppa, A thermochemical study of some selected laves phases, Acta Metallurgica 12, 87-97 (1964).
cited as the source of values for this phase
doi:10.1016/0925-8388(95)01526-4 H. Feufel, F. Sommer, Thermodynamic investigations of binary liquid and solid CuMg and MgNi alloys and ternary liquid CuMgNi alloys, Journal of Alloys and Compounds 224, 42-54 (1995).
cited as the source of values for this phase

MG2NI_CA (Mg–Ni)

Id: phase:mg-ni:mg2ni-ca; status assigned
Structure: Mg2Ni · C_a · hP18 · P6_222 (180); type st:c-a-mg2ni-hp18; tier A: standard phase name; confidence high
Stoichiometry: Mg 0.6667, Ni 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1030.66 K, x(Ni) 0.33333–0.33333
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-ni:mg2ni-ca
paper: paper:10.1016/j.calphad.2005.08.006:Mg2Ni
tdb: tdb:MgNi-05Isl.tdb:MG2NI_CA

TDB models of MG2NI_CA (1): PHASE and CONSTITUENT statements as written

MgNi-05Isl.tdb: MG2NI_CA, type code %, sha256 452d7faaa3e14191…

60: PHASE MG2NI_CA % 2 2 1 !
61: CONST MG2NI_CA : MG : NI : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2005.08.006 F. Islam, M. Medraj, The phase equilibria in the Mg–Ni–Ca system, Calphad 29, 289-302 (2005).
assessment that models this phase; reports values for this phase
doi:10.1002/zaac.19080570103 G. Voss, Die Legierungen: Nickel‐Zinn, Nickel‐Blei, Nickel‐Thallium, Nickel‐Wismut, Nickel‐Chrom, Nickel‐Magnesium, Nickel‐Zink und Nickel‐Cadmium, Z. Anorg. Chem. 57, 34-71 (1908).
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}
}