Ce–Cu phases

9 phases (tier A 5, tier C 3, liquid 1); 8 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 · Ce–Cu system page · Markdown · field reference

Phases of the Ce–Cu system (9)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:ce-cu:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 980.72–1075 K, x(Cu) 0–0.00716	4	2
CECU_B27 phase:ce-cu:cecu-b27	FeB · B27 · oP8 · Pnma (62)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–788.46 K, x(Cu) 0.5–0.5	8	2
CECU2 phase:ce-cu:cecu2	Hg2K · oI12 · Imma (74)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1089.95 K, x(Cu) 0.66667–0.66667	12	2
CECU4 phase:ce-cu:cecu4	CeCu4 · oP20 · Pnnm (58)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1068.03 K, x(Cu) 0.8–0.8	8	2
CECU5_D2D phase:ce-cu:cecu5-d2d	CaCu5 · D2_d · hP6 · P6/mmm (191)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1074.18 K, x(Cu) 0.83333–0.83333	8	2
CECU6 phase:ce-cu:cecu6	CeCu6 · oP28 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1211.18 K, x(Cu) 0.85714–0.85714	12	2
FCC_A1 phase:ce-cu:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–2499.75 K, x(Cu) 0–1	11	2
HCP_A3 phase:ce-cu: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:ce-cu:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 699.98–2500 K, x(Cu) 0–1	36	2

BCC_A2 (Ce–Cu)

Id: phase:ce-cu: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): 980.72–1075 K, x(Cu) 0–0.00716
Literature: 4 values (4 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ce-cu:bcc-a2
paper: paper:10.1007/bf02665998:Ce(bcc), paper:10.1016/j.jallcom.2009.04.083:δCe
tdb: tdb:CeCu-09Bo.tdb:BCC_A2, tdb:CeCu-96Zhu.tdb:BCC_A2

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

CeCu-09Bo.tdb: BCC_A2, type code %B, sha256 5e559495ec18884c…

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

CeCu-96Zhu.tdb: BCC_A2, type code %B, sha256 673f9f27a539576f…

37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : CE% CU : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.04.083 H. Bo, S. Jin, L.G. Zhang, X.M. Chen, H.M. Chen, L.B. Liu et al., Thermodynamic assessment of Al–Ce–Cu system, Journal of Alloys and Compounds 484, 286-295 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02665998 W. Zhuang, Z.-Y. Qiao, S. Wei, J. Shen, J. Phase Equilib., 17, 508-21(1996).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase

CECU_B27 (Ce–Cu)

Id: phase:ce-cu:cecu-b27; status assigned
Structure: FeB · B27 · oP8 · Pnma (62); type st:b27-feb-op8; tier A: standard phase name; confidence high
Stoichiometry: Ce 0.5000, Cu 0.5000
Stability: stable in 2 of 2 calculated diagram(s): 300–788.46 K, x(Cu) 0.5–0.5
Literature: 8 values (8 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ce-cu:cecu-b27
paper: paper:10.1007/bf02665998:CuCe, paper:10.1016/j.jallcom.2009.04.083:CuCe
tdb: tdb:CeCu-09Bo.tdb:CECU_B27, tdb:CeCu-96Zhu.tdb:CECU_B27

TDB models of CECU_B27 (2): PHASE and CONSTITUENT statements as written

CeCu-09Bo.tdb: CECU_B27, type code %, sha256 5e559495ec18884c…

46: PHASE CECU_B27 % 2 1 1 !
47: CONST CECU_B27 : CE : CU : !

CeCu-96Zhu.tdb: CECU_B27, type code %, sha256 673f9f27a539576f…

47: PHASE CECU_B27 % 2 1 1 !
48: CONST CECU_B27 : CE : CU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.04.083 H. Bo, S. Jin, L.G. Zhang, X.M. Chen, H.M. Chen, L.B. Liu et al., Thermodynamic assessment of Al–Ce–Cu system, Journal of Alloys and Compounds 484, 286-295 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02665998 W. Zhuang, Z.-Y. Qiao, S. Wei, J. Shen, J. Phase Equilib., 17, 508-21(1996).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase

CECU2 (Ce–Cu)

Id: phase:ce-cu:cecu2; status assigned
Structure: Hg2K · oI12 · Imma (74); type st:hg2k-oi12; 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 (dft_space_group_74_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ce 0.3333, Cu 0.6667
Stability: stable in 2 of 2 calculated diagram(s): 300–1089.95 K, x(Cu) 0.66667–0.66667
Literature: 12 values (12 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ce-cu:cecu2
paper: paper:10.1007/bf02665998:Cu2Ce, paper:10.1016/j.jallcom.2009.04.083:Cu2Ce
tdb: tdb:CeCu-09Bo.tdb:CECU2, tdb:CeCu-96Zhu.tdb:CECU2

TDB models of CECU2 (2): PHASE and CONSTITUENT statements as written

CeCu-09Bo.tdb: CECU2, type code %, sha256 5e559495ec18884c…

51: PHASE CECU2 % 2 1 2 !
52: CONST CECU2 : CE : CU : !

CeCu-96Zhu.tdb: CECU2, type code %, sha256 673f9f27a539576f…

52: PHASE CECU2 % 2 1 2 !
53: CONST CECU2 : CE : CU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.04.083 H. Bo, S. Jin, L.G. Zhang, X.M. Chen, H.M. Chen, L.B. Liu et al., Thermodynamic assessment of Al–Ce–Cu system, Journal of Alloys and Compounds 484, 286-295 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02665998 W. Zhuang, Z.-Y. Qiao, S. Wei, J. Shen, J. Phase Equilib., 17, 508-21(1996).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase

CECU4 (Ce–Cu)

Id: phase:ce-cu:cecu4; status assigned
Structure: CeCu4 · oP20 · Pnnm (58); type st:cecu4-op20; 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: Ce 0.2000, Cu 0.8000
Stability: stable in 2 of 2 calculated diagram(s): 300–1068.03 K, x(Cu) 0.8–0.8
Literature: 8 values (8 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ce-cu:cecu4
paper: paper:10.1007/bf02665998:Cu4Ce, paper:10.1016/j.jallcom.2009.04.083:Cu4Ce
tdb: tdb:CeCu-09Bo.tdb:CECU4, tdb:CeCu-96Zhu.tdb:CECU4

TDB models of CECU4 (2): PHASE and CONSTITUENT statements as written

CeCu-09Bo.tdb: CECU4, type code %, sha256 5e559495ec18884c…

56: PHASE CECU4 % 2 1 4 !
57: CONST CECU4 : CE : CU : !

CeCu-96Zhu.tdb: CECU4, type code %, sha256 673f9f27a539576f…

57: PHASE CECU4 % 2 1 4 !
58: CONST CECU4 : CE : CU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.04.083 H. Bo, S. Jin, L.G. Zhang, X.M. Chen, H.M. Chen, L.B. Liu et al., Thermodynamic assessment of Al–Ce–Cu system, Journal of Alloys and Compounds 484, 286-295 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02665998 W. Zhuang, Z.-Y. Qiao, S. Wei, J. Shen, J. Phase Equilib., 17, 508-21(1996).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase

CECU5_D2D (Ce–Cu)

Id: phase:ce-cu:cecu5-d2d; status assigned
Structure: CaCu5 · D2_d · hP6 · P6/mmm (191); type st:d2-d-cacu5-hp6; tier A: standard phase name; confidence high
Stoichiometry: Ce 0.1667, Cu 0.8333
Stability: stable in 2 of 2 calculated diagram(s): 300–1074.18 K, x(Cu) 0.83333–0.83333
Literature: 8 values (8 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ce-cu:cecu5-d2d
paper: paper:10.1007/bf02665998:Cu5Ce, paper:10.1016/j.jallcom.2009.04.083:Cu5Ce
tdb: tdb:CeCu-09Bo.tdb:CECU5_D2D, tdb:CeCu-96Zhu.tdb:CECU5_D2D

TDB models of CECU5_D2D (2): PHASE and CONSTITUENT statements as written

CeCu-09Bo.tdb: CECU5_D2D, type code %, sha256 5e559495ec18884c…

61: PHASE CECU5_D2D % 2 1 5 !
62: CONST CECU5_D2D : CE : CU : !

CeCu-96Zhu.tdb: CECU5_D2D, type code %, sha256 673f9f27a539576f…

62: PHASE CECU5_D2D % 2 1 5 !
63: CONST CECU5_D2D : CE : CU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.04.083 H. Bo, S. Jin, L.G. Zhang, X.M. Chen, H.M. Chen, L.B. Liu et al., Thermodynamic assessment of Al–Ce–Cu system, Journal of Alloys and Compounds 484, 286-295 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02665998 W. Zhuang, Z.-Y. Qiao, S. Wei, J. Shen, J. Phase Equilib., 17, 508-21(1996).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase

CECU6 (Ce–Cu)

Id: phase:ce-cu:cecu6; status assigned
Structure: CeCu6 · oP28 · Pnma (62); type st:cecu6-op28; 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_oqmd, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ce 0.1429, Cu 0.8571
Stability: stable in 2 of 2 calculated diagram(s): 300–1211.18 K, x(Cu) 0.85714–0.85714
Literature: 12 values (12 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ce-cu:cecu6
paper: paper:10.1007/bf02665998:Cu6Ce, paper:10.1016/j.jallcom.2009.04.083:Cu6Ce
tdb: tdb:CeCu-09Bo.tdb:CECU6, tdb:CeCu-96Zhu.tdb:CECU6

TDB models of CECU6 (2): PHASE and CONSTITUENT statements as written

CeCu-09Bo.tdb: CECU6, type code %, sha256 5e559495ec18884c…

66: PHASE CECU6 % 2 1 6 !
67: CONST CECU6 : CE : CU : !

CeCu-96Zhu.tdb: CECU6, type code %, sha256 673f9f27a539576f…

67: PHASE CECU6 % 2 1 6 !
68: CONST CECU6 : CE : CU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.04.083 H. Bo, S. Jin, L.G. Zhang, X.M. Chen, H.M. Chen, L.B. Liu et al., Thermodynamic assessment of Al–Ce–Cu system, Journal of Alloys and Compounds 484, 286-295 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02665998 W. Zhuang, Z.-Y. Qiao, S. Wei, J. Shen, J. Phase Equilib., 17, 508-21(1996).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase

FCC_A1 (Ce–Cu)

Id: phase:ce-cu: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): 300–2499.75 K, x(Cu) 0–1
Literature: 11 values (11 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:ce-cu:fcc-a1
paper: paper:10.1007/bf02665998:Ce(fcc), paper:10.1007/bf02665998:Cu(fcc), paper:10.1016/j.jallcom.2009.04.083:Fcc_Cu, paper:10.1016/j.jallcom.2009.04.083:γCe
tdb: tdb:CeCu-09Bo.tdb:FCC_A1, tdb:CeCu-96Zhu.tdb:FCC_A1

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

CeCu-09Bo.tdb: FCC_A1, type code %A, sha256 5e559495ec18884c…

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

CeCu-96Zhu.tdb: FCC_A1, type code %A, sha256 673f9f27a539576f…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : CE% CU% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.04.083 H. Bo, S. Jin, L.G. Zhang, X.M. Chen, H.M. Chen, L.B. Liu et al., Thermodynamic assessment of Al–Ce–Cu system, Journal of Alloys and Compounds 484, 286-295 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02665998 W. Zhuang, Z.-Y. Qiao, S. Wei, J. Shen, J. Phase Equilib., 17, 508-21(1996).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase

HCP_A3 (Ce–Cu)

Id: phase:ce-cu: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:ce-cu:hcp-a3
tdb: tdb:CeCu-09Bo.tdb:HCP_A3, tdb:CeCu-96Zhu.tdb:HCP_A3

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

CeCu-09Bo.tdb: HCP_A3, type code %A, sha256 5e559495ec18884c…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : CE CU% : VA : !

CeCu-96Zhu.tdb: HCP_A3, type code %A, sha256 673f9f27a539576f…

42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : CE CU% : VA : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02665998 W. Zhuang, Z.-Y. Qiao, S. Wei, J. Shen, J. Phase Equilib., 17, 508-21(1996).
assessment that models this phase
doi:10.1016/j.jallcom.2009.04.083 H. Bo, S. Jin, L.G. Zhang, X.M. Chen, H.M. Chen, L.B. Liu et al., Thermodynamic assessment of Al–Ce–Cu system, Journal of Alloys and Compounds 484, 286-295 (2009).
assessment that models this phase

LIQUID (Ce–Cu)

Id: phase:ce-cu:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 699.98–2500 K, x(Cu) 0–1
Literature: 36 values (36 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ce-cu:liquid
paper: paper:10.1007/bf02665998:L, paper:10.1016/j.jallcom.2009.04.083:L
tdb: tdb:CeCu-09Bo.tdb:LIQUID, tdb:CeCu-96Zhu.tdb:LIQUID

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

CeCu-09Bo.tdb: LIQUID, type code %, sha256 5e559495ec18884c…

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

CeCu-96Zhu.tdb: LIQUID, type code %, sha256 673f9f27a539576f…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : CE CU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.04.083 H. Bo, S. Jin, L.G. Zhang, X.M. Chen, H.M. Chen, L.B. Liu et al., Thermodynamic assessment of Al–Ce–Cu system, Journal of Alloys and Compounds 484, 286-295 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02665998 W. Zhuang, Z.-Y. Qiao, S. Wei, J. Shen, J. Phase Equilib., 17, 508-21(1996).
assessment that models this phase; cited as the source of values for this phase; reports 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}
}