Cu–Pd phases

10 phases (tier A 5, tier C 1, liquid 1, needs_review 3); 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 · Cu–Pd system page · Markdown · field reference

Phases of the Cu–Pd system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:cu-pd:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
B2_BCC phase:cu-pd:bcc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 2 calculated diagram(s): 300–865 K, x(Pd) 0.30064–0.49997	4	2
D1_LPS phase:cu-pd:d1-lps		needs_review	stable in 1 of 1 calculated diagram(s): 1670–1710 K, x(Pd) 0.97–0.97	0	1
D2_LPS phase:cu-pd:d2-lps	Cu3Pd · oP320 · Pnnm (58)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1720 K, x(Pd) 0–0.97	4	1
FCC_2 phase:cu-pd:fcc-2		needs_review	not stable in 1 calculated diagram(s)	0	1
FCC_3 phase:cu-pd:fcc-3		needs_review	not stable in 1 calculated diagram(s)	0	1
FCC_A1 phase:cu-pd:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 2 calculated diagram(s): 300–2499.25 K, x(Pd) 0–1	10	3
L12_FCC phase:cu-pd:fcc-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1828 K, x(Pd) 0–1	4	1
HCP_A3 phase:cu-pd:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
LIQUID phase:cu-pd:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 1357.77–2500 K, x(Pd) 0–1	1	2

BCC_A2 (Cu–Pd)

Id: phase:cu-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 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-pd:bcc-a2
tdb: tdb:CuPd-07Hua.tdb:BCC_A2, tdb:CuPd-08Li.tdb:BCC_A2

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

CuPd-07Hua.tdb: BCC_A2, type code %B, sha256 06510f59b44887a3…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : CU PD : VA : !

CuPd-08Li.tdb: BCC_A2, type code %B, sha256 9f6569339cd316e7…

64: PHASE BCC_A2 %B 2 1 3 !
65: CONST BCC_A2 : CU PD : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2007.02.002 Weiming Huang, Susanne M. Opalka, Da Wang, Ted B. Flanagan, Thermodynamic modelling of the Cu–Pd–H system, Calphad 31, 315-329 (2007).
assessment that models this phase
doi:10.1016/j.calphad.2008.04.004 Mei Li, Zhenmin Du, Cuiping Guo, Changrong Li, A thermodynamic modeling of the Cu–Pd system, Calphad 32, 439-446 (2008).
assessment that models this phase

B2_BCC (Cu–Pd)

Id: phase:cu-pd:bcc-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in CuPd-07Hua.tdb also describes the disordered state
Caveat: partitioned order/disorder model in CuPd-08Li.tdb also describes the disordered state
Stability: stable in 1 of 2 calculated diagram(s): 300–865 K, x(Pd) 0.30064–0.49997
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:cu-pd:bcc-b2, corpus:phase:cu-pd:b2-bcc
paper: paper:10.1016/j.calphad.2008.04.004:CuPd
tdb: tdb:CuPd-07Hua.tdb:B2_BCC, tdb:CuPd-08Li.tdb:B2_BCC

TDB models of B2_BCC (2): PHASE and CONSTITUENT statements as written

CuPd-07Hua.tdb: B2_BCC, type code %B, sha256 06510f59b44887a3…

41: PHASE B2_BCC %B 3 0.5 0.5 1 !
42: CONST B2_BCC : CU% PD : CU PD% : VA : !

CuPd-08Li.tdb: B2_BCC, type code %, sha256 9f6569339cd316e7…

69: PHASE B2_BCC % 2 1 1 !
70: CONST B2_BCC : CU% PD : CU PD% : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2008.04.004 Mei Li, Zhenmin Du, Cuiping Guo, Changrong Li, A thermodynamic modeling of the Cu–Pd system, Calphad 32, 439-446 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.02.002 Weiming Huang, Susanne M. Opalka, Da Wang, Ted B. Flanagan, Thermodynamic modelling of the Cu–Pd–H system, Calphad 31, 315-329 (2007).
assessment that models this phase
doi:10.1007/bf02663663 P Huang, S Menon, D de Fontaine, On the Cu-Pd phase diagram, JPE 12, 3-5 (1991).
cited as the source of values for this phase

D1_LPS (Cu–Pd)

Id: phase:cu-pd:d1-lps; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:sgte_mmc2_row_disagrees_with_name; sgte_mmc2_row_disagrees_with_name:D1_LPS; unrecognised_name_tokens:LPS
Candidate (name_token): NH3 · D1 · cP16 · P2_13 (198) — Strukturbericht/word 'D1' in the TDB name
Candidate (sgte_mmc2): Cu3Pd · tP28 · P4/mmm (123) — Hallstedt 2025 mmc2 row for D1_LPS: Cu3Pd (1D-LPS)
Candidate (tdb_comment): Cu3Pd · tP28 · P4/mmm — CuPd-08Li.tdb: 'Prototype Cu3Pd (tP28, P4/mmm), 1D-LPS'
Stability: stable in 1 of 1 calculated diagram(s): 1670–1710 K, x(Pd) 0.97–0.97
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:cu-pd:d1-lps
tdb: tdb:CuPd-08Li.tdb:D1_LPS

TDB models of D1_LPS (1): PHASE and CONSTITUENT statements as written

CuPd-08Li.tdb: D1_LPS, type code %AU, sha256 9f6569339cd316e7…

49: PHASE D1_LPS %AU 3 0.75 0.25 1 !
50: CONST D1_LPS : CU% PD : CU PD% : VA :  !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2008.04.004 Mei Li, Zhenmin Du, Cuiping Guo, Changrong Li, A thermodynamic modeling of the Cu–Pd system, Calphad 32, 439-446 (2008).
assessment that models this phase

D2_LPS (Cu–Pd)

Id: phase:cu-pd:d2-lps; status assigned
Structure: Cu3Pd · oP320 · Pnnm (58); type st:cu3pd-op320; 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:D2,LPS, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 300–1720 K, x(Pd) 0–0.97
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-pd:d2-lps
paper: paper:10.1016/j.calphad.2008.04.004:2D-LPS
tdb: tdb:CuPd-08Li.tdb:D2_LPS

TDB models of D2_LPS (1): PHASE and CONSTITUENT statements as written

CuPd-08Li.tdb: D2_LPS, type code %AV, sha256 9f6569339cd316e7…

59: PHASE D2_LPS %AV 3 0.75 0.25 1 !
60: CONST D2_LPS : CU% PD : CU PD% : VA :  !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2008.04.004 Mei Li, Zhenmin Du, Cuiping Guo, Changrong Li, A thermodynamic modeling of the Cu–Pd system, Calphad 32, 439-446 (2008).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02663663 P Huang, S Menon, D de Fontaine, On the Cu-Pd phase diagram, JPE 12, 3-5 (1991).
cited as the source of values for this phase

FCC_2 (Cu–Pd)

Id: phase:cu-pd:fcc-2; status needs_review
No structure assigned. Why: unrecognised_name_tokens:2
Candidate (name_token): Cu · A1 · cF4 · Fm-3m (225) — Strukturbericht/word 'A1' in the TDB name
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:cu-pd:fcc-2
tdb: tdb:CuPd-08Li.tdb:FCC_2

TDB models of FCC_2 (1): PHASE and CONSTITUENT statements as written

CuPd-08Li.tdb: FCC_2, type code %A, sha256 9f6569339cd316e7…

44: PHASE FCC_2 %A 2 1 1 !
45: CONST FCC_2 : CU% PD% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2008.04.004 Mei Li, Zhenmin Du, Cuiping Guo, Changrong Li, A thermodynamic modeling of the Cu–Pd system, Calphad 32, 439-446 (2008).
assessment that models this phase

FCC_3 (Cu–Pd)

Id: phase:cu-pd:fcc-3; status needs_review
No structure assigned. Why: unrecognised_name_tokens:3
Candidate (name_token): Cu · A1 · cF4 · Fm-3m (225) — Strukturbericht/word 'A1' in the TDB name
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:cu-pd:fcc-3
tdb: tdb:CuPd-08Li.tdb:FCC_3

TDB models of FCC_3 (1): PHASE and CONSTITUENT statements as written

CuPd-08Li.tdb: FCC_3, type code %A, sha256 9f6569339cd316e7…

54: PHASE FCC_3 %A 2 1 1 !
55: CONST FCC_3 : CU% PD% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2008.04.004 Mei Li, Zhenmin Du, Cuiping Guo, Changrong Li, A thermodynamic modeling of the Cu–Pd system, Calphad 32, 439-446 (2008).
assessment that models this phase

FCC_A1 (Cu–Pd)

Id: phase:cu-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 2 calculated diagram(s): 300–2499.25 K, x(Pd) 0–1
Literature: 10 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:cu-pd:fcc-a1
paper: paper:10.1016/j.calphad.2008.04.004:fcc
tdb: tdb:CuPd-07Hua.tdb:FCC_A1, tdb:CuPd-08Li.tdb:A1_FCC, tdb:CuPd-08Li.tdb:FCC_A1

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

CuPd-07Hua.tdb: FCC_A1, type code %A, sha256 06510f59b44887a3…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : CU% PD% : VA : !

CuPd-08Li.tdb: A1_FCC, type code %A, sha256 9f6569339cd316e7…

34: PHASE A1_FCC %A 2 1 1 !
35: CONST A1_FCC : CU% PD% : VA : !

CuPd-08Li.tdb: FCC_A1, type code %A, sha256 9f6569339cd316e7…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : CU% PD% : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2008.04.004 Mei Li, Zhenmin Du, Cuiping Guo, Changrong Li, A thermodynamic modeling of the Cu–Pd system, Calphad 32, 439-446 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.02.002 Weiming Huang, Susanne M. Opalka, Da Wang, Ted B. Flanagan, Thermodynamic modelling of the Cu–Pd–H system, Calphad 31, 315-329 (2007).
assessment that models this phase
doi:10.1007/bf02663663 P Huang, S Menon, D de Fontaine, On the Cu-Pd phase diagram, JPE 12, 3-5 (1991).
cited as the source of values for this phase

L12_FCC (Cu–Pd)

Id: phase:cu-pd:fcc-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Caveat: CuPd-08Li.tdb: ordered phase with disordered part A1_FCC (order/disorder model)
Caveat: partitioned order/disorder model in CuPd-08Li.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–1828 K, x(Pd) 0–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cu-pd:fcc-l12, corpus:phase:cu-pd:l12-fcc
paper: paper:10.1016/j.calphad.2008.04.004:Cu3Pd
tdb: tdb:CuPd-08Li.tdb:L12_FCC

TDB models of L12_FCC (1): PHASE and CONSTITUENT statements as written

CuPd-08Li.tdb: L12_FCC, type code %AY, sha256 9f6569339cd316e7…

39: PHASE L12_FCC %AY 3 0.75 0.25 1 !
40: CONST L12_FCC : CU% PD : CU PD% : VA :  !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2008.04.004 Mei Li, Zhenmin Du, Cuiping Guo, Changrong Li, A thermodynamic modeling of the Cu–Pd system, Calphad 32, 439-446 (2008).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02663663 P Huang, S Menon, D de Fontaine, On the Cu-Pd phase diagram, JPE 12, 3-5 (1991).
cited as the source of values for this phase

HCP_A3 (Cu–Pd)

Id: phase:cu-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: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-pd:hcp-a3
tdb: tdb:CuPd-07Hua.tdb:HCP_A3, tdb:CuPd-08Li.tdb:HCP_A3

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

CuPd-07Hua.tdb: HCP_A3, type code %A, sha256 06510f59b44887a3…

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

CuPd-08Li.tdb: HCP_A3, type code %A, sha256 9f6569339cd316e7…

74: PHASE HCP_A3 %A 2 1 0.5 !
75: CONST HCP_A3 : CU PD : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2007.02.002 Weiming Huang, Susanne M. Opalka, Da Wang, Ted B. Flanagan, Thermodynamic modelling of the Cu–Pd–H system, Calphad 31, 315-329 (2007).
assessment that models this phase
doi:10.1016/j.calphad.2008.04.004 Mei Li, Zhenmin Du, Cuiping Guo, Changrong Li, A thermodynamic modeling of the Cu–Pd system, Calphad 32, 439-446 (2008).
assessment that models this phase

LIQUID (Cu–Pd)

Id: phase:cu-pd:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1357.77–2500 K, x(Pd) 0–1
Literature: 1 values (1 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cu-pd:liquid
paper: paper:10.1016/j.calphad.2007.02.002:liquid
tdb: tdb:CuPd-07Hua.tdb:LIQUID, tdb:CuPd-08Li.tdb:LIQUID

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

CuPd-07Hua.tdb: LIQUID, type code %, sha256 06510f59b44887a3…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : CU PD : !

CuPd-08Li.tdb: LIQUID, type code %, sha256 9f6569339cd316e7…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : CU PD : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2007.02.002 Weiming Huang, Susanne M. Opalka, Da Wang, Ted B. Flanagan, Thermodynamic modelling of the Cu–Pd–H system, Calphad 31, 315-329 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2008.04.004 Mei Li, Zhenmin Du, Cuiping Guo, Changrong Li, A thermodynamic modeling of the Cu–Pd system, Calphad 32, 439-446 (2008).
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}
}