Mg–Pd phases

14 phases (tier A 9, tier C 1, liquid 1, needs_review 3); 13 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–Pd system page · Markdown · field reference

Phases of the Mg–Pd system (14)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:mg-pd:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
FCC_A1 phase:mg-pd:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2499.87 K, x(Pd) 0.77746–1	1
HCP_A3 phase:mg-pd:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–924.1 K, x(Pd) 0–0	1
LIQUID phase:mg-pd:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 809.1–2500 K, x(Pd) 0–1	1
MG2PD phase:mg-pd:mg2pd		needs_review	stable in 1 of 1 calculated diagram(s): 300–957.85 K, x(Pd) 0.33333–0.33333	1
MG3PD_D021 phase:mg-pd:mg3pd-d021	Cu3P · D0_21 · hP24 · P6_3cm (185)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–901.39 K, x(Pd) 0.25–0.25	1
MG4PD phase:mg-pd:mg4pd		needs_review	stable in 1 of 1 calculated diagram(s): 300–842.25 K, x(Pd) 0.201–0.201	1
MG5PD2_D811 phase:mg-pd:mg5pd2-d811	Al5Co2 · D8_11 · hP28 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–967.3 K, x(Pd) 0.28571–0.28571	1
MG6PD phase:mg-pd:mg6pd	Mg6Pd · cF396 · F-43m (216)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–844.1 K, x(Pd) 0.14286–0.14286	1
MG79PD21 phase:mg-pd:mg79pd21		needs_review	stable in 1 of 1 calculated diagram(s): 300–854.87 K, x(Pd) 0.215–0.215	1
MG9PD11_L2A phase:mg-pd:mg9pd11-l2a	CuTi-delta · L2_a · tP2 · P4/mmm (123)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1640.47 K, x(Pd) 0.55–0.55	1
MGPD_B2 phase:mg-pd:mgpd-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1275.84 K, x(Pd) 0.5–0.5	1
MGPD2_C37 phase:mg-pd:mgpd2-c37	Co2Si · C37 · oP12 · Pnma (62)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–899.38 K, x(Pd) 0.66667–0.66667	1
MGPD3_D023 phase:mg-pd:mgpd3-d023	Al3Zr · D0_23 · tI16 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–980 K, x(Pd) 0.75–0.75	1

BCC_A2 (Mg–Pd)

Id: phase:mg-pd: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 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:mg-pd:bcc-a2
tdb: tdb:MgPd-24Gie.tdb:BCC_A2

TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: BCC_A2, type code %B, sha256 9b298638a793fb71…

41: PHASE BCC_A2 %B 2 1 3 !
42: CONST BCC_A2 : MG PD : VA% : !

FCC_A1 (Mg–Pd)

Id: phase:mg-pd: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 1 of 1 calculated diagram(s): 300–2499.87 K, x(Pd) 0.77746–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:mg-pd:fcc-a1
tdb: tdb:MgPd-24Gie.tdb:FCC_A1

TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: FCC_A1, type code %A, sha256 9b298638a793fb71…

36: PHASE FCC_A1 %A 2 1 1 !
37: CONST FCC_A1 : MG PD% : VA% : !

HCP_A3 (Mg–Pd)

Id: phase:mg-pd: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 1 of 1 calculated diagram(s): 300–924.1 K, x(Pd) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:mg-pd:hcp-a3
tdb: tdb:MgPd-24Gie.tdb:HCP_A3

TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: HCP_A3, type code %A, sha256 9b298638a793fb71…

46: PHASE HCP_A3 %A 2 1 0.5 !
47: CONST HCP_A3 : MG% PD : VA% : !

LIQUID (Mg–Pd)

Id: phase:mg-pd:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 809.1–2500 K, x(Pd) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:mg-pd:liquid
tdb: tdb:MgPd-24Gie.tdb:LIQUID

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

MgPd-24Gie.tdb: LIQUID, type code %, sha256 9b298638a793fb71…

31: PHASE LIQUID:L % 1 1 !
32: CONST LIQUID:L : MG PD : !

MG2PD (Mg–Pd)

Id: phase:mg-pd:mg2pd; status needs_review
No structure assigned. Why: no_on_hull_entry_in_mp; no_structure_token
Candidate (dft_oqmd): I4/mcm (140) — on-hull OQMD Mg2 Pd1 at x(PD)=0.3333
Candidate (tdb_comment): NiTi2 · cF96 · Fd-3m — MgPd-24Gie.tdb: 'Prototype NiTi2 (cF96, Fd-3m)'
Stoichiometry: Mg 0.6667, Pd 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–957.85 K, x(Pd) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:mg-pd:mg2pd
tdb: tdb:MgPd-24Gie.tdb:MG2PD

TDB models of MG2PD (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: MG2PD, type code %, sha256 9b298638a793fb71…

76: PHASE MG2PD % 2 2 1 !
77: CONST MG2PD : MG : PD : !

MG3PD_D021 (Mg–Pd)

Id: phase:mg-pd:mg3pd-d021; status assigned
Structure: Cu3P · D0_21 · hP24 · P6_3cm (185); type st:d0-21-cu3p-hp24; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaabbrs and oqmd-25113, space group 185
Stoichiometry: Mg 0.7500, Pd 0.2500
Stability: stable in 1 of 1 calculated diagram(s): 300–901.39 K, x(Pd) 0.25–0.25
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:mg-pd:mg3pd-d021
mp: mp:mp-aaaabbrs
oqmd: oqmd:oqmd-25113
tdb: tdb:MgPd-24Gie.tdb:MG3PD_D021

TDB models of MG3PD_D021 (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: MG3PD_D021, type code %, sha256 9b298638a793fb71…

66: PHASE MG3PD_D021 % 2 3 1 !
67: CONST MG3PD_D021 : MG : PD : !

MG4PD (Mg–Pd)

Id: phase:mg-pd:mg4pd; status needs_review
No structure assigned. Why: assessment_declared_compound_differs_from_model_composition; no_on_hull_entry_in_both; no_structure_token
Candidate (sgte_mmc2): Mg4Pd · oC1536 · Cmme (67) — Hallstedt 2025 mmc2 row for MG4PD: Mg4Pd (also Mg306Pd77)
Candidate (tdb_comment): Mg4Pd · oC1536 · Cmme — MgPd-24Gie.tdb: 'Prototype Mg4Pd (oC1536, Cmme), Mg306Pd77'
Stoichiometry: Mg 0.7990, Pd 0.2010
Stability: stable in 1 of 1 calculated diagram(s): 300–842.25 K, x(Pd) 0.201–0.201
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:mg-pd:mg4pd
tdb: tdb:MgPd-24Gie.tdb:MG4PD

TDB models of MG4PD (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: MG4PD, type code %, sha256 9b298638a793fb71…

56: PHASE MG4PD % 2 0.799 0.201 !
57: CONST MG4PD : MG : PD : !

MG5PD2_D811 (Mg–Pd)

Id: phase:mg-pd:mg5pd2-d811; status assigned
Structure: Al5Co2 · D8_11 · hP28 · P6_3/mmc (194); type st:d8-11-al5co2-hp28; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaadoo and oqmd-25820, space group 194
Stoichiometry: Mg 0.7143, Pd 0.2857
Stability: stable in 1 of 1 calculated diagram(s): 300–967.3 K, x(Pd) 0.28571–0.28571
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:mg-pd:mg5pd2-d811
mp: mp:mp-aaaaadoo
oqmd: oqmd:oqmd-25820
tdb: tdb:MgPd-24Gie.tdb:MG5PD2_D811

TDB models of MG5PD2_D811 (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: MG5PD2_D811, type code %, sha256 9b298638a793fb71…

71: PHASE MG5PD2_D811 % 2 5 2 !
72: CONST MG5PD2_D811 : MG : PD : !

MG6PD (Mg–Pd)

Id: phase:mg-pd:mg6pd; status assigned
Structure: Mg6Pd · cF396 · F-43m (216); type st:mg6pd-cf396; 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: Mg 0.8571, Pd 0.1429
Stability: stable in 1 of 1 calculated diagram(s): 300–844.1 K, x(Pd) 0.14286–0.14286
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:mg-pd:mg6pd
tdb: tdb:MgPd-24Gie.tdb:MG6PD

TDB models of MG6PD (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: MG6PD, type code %, sha256 9b298638a793fb71…

51: PHASE MG6PD % 2 6 1 !
52: CONST MG6PD : MG : PD : !

MG79PD21 (Mg–Pd)

Id: phase:mg-pd:mg79pd21; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (Mg79Pd21) — Hallstedt 2025 mmc2 row for MG79PD21: Mg79Pd21
Stoichiometry: Mg 0.7850, Pd 0.2150
Stability: stable in 1 of 1 calculated diagram(s): 300–854.87 K, x(Pd) 0.215–0.215
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:mg-pd:mg79pd21
tdb: tdb:MgPd-24Gie.tdb:MG79PD21

TDB models of MG79PD21 (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: MG79PD21, type code %, sha256 9b298638a793fb71…

61: PHASE MG79PD21 % 2 0.785 0.215 !
62: CONST MG79PD21 : MG : PD : !

MG9PD11_L2A (Mg–Pd)

Id: phase:mg-pd:mg9pd11-l2a; status assigned
Structure: CuTi-delta · L2_a · tP2 · P4/mmm (123); type st:l2-a-cuti-delta-tp2; tier A: standard phase name; confidence high
Stoichiometry: Mg 0.4500, Pd 0.5500
Stability: stable in 1 of 1 calculated diagram(s): 300–1640.47 K, x(Pd) 0.55–0.55
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:mg-pd:mg9pd11-l2a
tdb: tdb:MgPd-24Gie.tdb:MG9PD11_L2A

TDB models of MG9PD11_L2A (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: MG9PD11_L2A, type code %, sha256 9b298638a793fb71…

86: PHASE MG9PD11_L2A % 2 9 11 !
87: CONST MG9PD11_L2A : MG : PD : !

MGPD_B2 (Mg–Pd)

Id: phase:mg-pd:mgpd-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Stoichiometry: Mg 0.5000, Pd 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1275.84 K, x(Pd) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:mg-pd:mgpd-b2
tdb: tdb:MgPd-24Gie.tdb:MGPD_B2

TDB models of MGPD_B2 (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: MGPD_B2, type code %, sha256 9b298638a793fb71…

81: PHASE MGPD_B2 % 2 1 1 !
82: CONST MGPD_B2 : MG : PD : !

MGPD2_C37 (Mg–Pd)

Id: phase:mg-pd:mgpd2-c37; status assigned
Structure: Co2Si · C37 · oP12 · Pnma (62); type st:c37-co2si-op12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaswb and oqmd-19257, space group 62
Stoichiometry: Mg 0.3333, Pd 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–899.38 K, x(Pd) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:mg-pd:mgpd2-c37
mp: mp:mp-aaaaaswb
oqmd: oqmd:oqmd-19257
tdb: tdb:MgPd-24Gie.tdb:MGPD2_C37

TDB models of MGPD2_C37 (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: MGPD2_C37, type code %, sha256 9b298638a793fb71…

91: PHASE MGPD2_C37 % 2 1 2 !
92: CONST MGPD2_C37 : MG : PD : !

MGPD3_D023 (Mg–Pd)

Id: phase:mg-pd:mgpd3-d023; status assigned
Structure: Al3Zr · D0_23 · tI16 · I4/mmm (139); type st:d0-23-al3zr-ti16; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaswc and oqmd-19258, space group 139
Stoichiometry: Mg 0.2500, Pd 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–980 K, x(Pd) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:mg-pd:mgpd3-d023
mp: mp:mp-aaaaaswc
oqmd: oqmd:oqmd-19258
tdb: tdb:MgPd-24Gie.tdb:MGPD3_D023

TDB models of MGPD3_D023 (1): PHASE and CONSTITUENT statements as written

MgPd-24Gie.tdb: MGPD3_D023, type code %, sha256 9b298638a793fb71…

96: PHASE MGPD3_D023 % 2 1 3 !
97: CONST MGPD3_D023 : MG : PD : !

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}
}