Cu–Pr phases

10 phases (tier A 6, tier C 2, liquid 1, needs_review 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 · Cu–Pr system page · Markdown · field reference

Phases of the Cu–Pr system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:cu-pr:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1063.4–2298.4 K, x(Pr) 0.99845–1	0	1
CU2PR phase:cu-pr:cu2pr	Hg2K · oI12 · Imma (74)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1104.22 K, x(Pr) 0.33333–0.33333	3	1
CU4PR phase:cu-pr:cu4pr		needs_review	stable in 1 of 1 calculated diagram(s): 300–1091.84 K, x(Pr) 0.2–0.2	2	1
CU5PR_D2D phase:cu-pr:cu5pr-d2d	CaCu5 · D2_d · hP6 · P6/mmm (191)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1107.11 K, x(Pr) 0.16667–0.16667	2	1
CU6PR phase:cu-pr:cu6pr	CeCu6 · oP28 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1218.29 K, x(Pr) 0.14286–0.14286	4	1
CUPR_B27 phase:cu-pr:cupr-b27	FeB · B27 · oP8 · Pnma (62)	tier A: standard phase name	not stable in 1 calculated diagram(s)	2	1
DHCP phase:cu-pr:dhcp-a3	alpha-La · A3' · hP4 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1203 K, x(Pr) 1–1	0	1
FCC_A1 phase:cu-pr:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1367.31 K, x(Pr) 0–0	1	1
HCP_A3 phase:cu-pr:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
LIQUID phase:cu-pr:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 564.75–2500 K, x(Pr) 0–1	10	1

BCC_A2 (Cu–Pr)

Id: phase:cu-pr: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 1 of 1 calculated diagram(s): 1063.4–2298.4 K, x(Pr) 0.99845–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:cu-pr:bcc-a2
tdb: tdb:CuPr-96Zhu.tdb:BCC_A2

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

CuPr-96Zhu.tdb: BCC_A2, type code %B, sha256 80386a76c9a9fa0e…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : CU PR% : VA : !

Example references (1 of 1; 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

CU2PR (Cu–Pr)

Id: phase:cu-pr:cu2pr; 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 (mp_oqmd_space_groups_differ, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Cu 0.6667, Pr 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1104.22 K, x(Pr) 0.33333–0.33333
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-pr:cu2pr
paper: paper:10.1007/bf02665998:Cu2Pr
tdb: tdb:CuPr-96Zhu.tdb:CU2PR

TDB models of CU2PR (1): PHASE and CONSTITUENT statements as written

CuPr-96Zhu.tdb: CU2PR, type code %, sha256 80386a76c9a9fa0e…

65: PHASE CU2PR % 2 2 1 !
66: CONST CU2PR : CU : PR : !

Example references (1 of 1; 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; reports values for this phase

CU4PR (Cu–Pr)

Id: phase:cu-pr:cu4pr; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (Cu4Pr) · o** — printed with a label mapped to this phase
Candidate (sgte_mmc2): (Cu4Pr) — Hallstedt 2025 mmc2 row for CU4PR: Cu4Pr
Stoichiometry: Cu 0.8000, Pr 0.2000
Stability: stable in 1 of 1 calculated diagram(s): 300–1091.84 K, x(Pr) 0.2–0.2
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-pr:cu4pr
paper: paper:10.1007/bf02665998:Cu4Pr
tdb: tdb:CuPr-96Zhu.tdb:CU4PR

TDB models of CU4PR (1): PHASE and CONSTITUENT statements as written

CuPr-96Zhu.tdb: CU4PR, type code %, sha256 80386a76c9a9fa0e…

60: PHASE CU4PR % 2 4 1 !
61: CONST CU4PR : CU : PR : !

Example references (1 of 1; 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; reports values for this phase

CU5PR_D2D (Cu–Pr)

Id: phase:cu-pr:cu5pr-d2d; status assigned
Structure: CaCu5 · D2_d · hP6 · P6/mmm (191); type st:d2-d-cacu5-hp6; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaadqs and oqmd-29756, space group 191
Stoichiometry: Cu 0.8333, Pr 0.1667
Stability: stable in 1 of 1 calculated diagram(s): 300–1107.11 K, x(Pr) 0.16667–0.16667
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:cu-pr:cu5pr-d2d
mp: mp:mp-aaaaadqs
oqmd: oqmd:oqmd-29756
paper: paper:10.1007/bf02665998:Cu5Pr
tdb: tdb:CuPr-96Zhu.tdb:CU5PR_D2D

TDB models of CU5PR_D2D (1): PHASE and CONSTITUENT statements as written

CuPr-96Zhu.tdb: CU5PR_D2D, type code %, sha256 80386a76c9a9fa0e…

55: PHASE CU5PR_D2D % 2 5 1 !
56: CONST CU5PR_D2D : CU : PR : !

Example references (1 of 1; 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; reports values for this phase

CU6PR (Cu–Pr)

Id: phase:cu-pr:cu6pr; 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_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Cu 0.8571, Pr 0.1429
Stability: stable in 1 of 1 calculated diagram(s): 300–1218.29 K, x(Pr) 0.14286–0.14286
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-pr:cu6pr
paper: paper:10.1007/bf02665998:Cu6Pr
tdb: tdb:CuPr-96Zhu.tdb:CU6PR

TDB models of CU6PR (1): PHASE and CONSTITUENT statements as written

CuPr-96Zhu.tdb: CU6PR, type code %, sha256 80386a76c9a9fa0e…

50: PHASE CU6PR % 2 6 1 !
51: CONST CU6PR : CU : PR : !

Example references (1 of 1; 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; reports values for this phase

CUPR_B27 (Cu–Pr)

Id: phase:cu-pr:cupr-b27; status assigned
Structure: FeB · B27 · oP8 · Pnma (62); type st:b27-feb-op8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacjkhn and oqmd-29755, space group 62
Stoichiometry: Cu 0.5000, Pr 0.5000
Stability: not stable in 1 calculated diagram(s)
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:cu-pr:cupr-b27
mp: mp:mp-aaacjkhn
oqmd: oqmd:oqmd-29755
paper: paper:10.1007/bf02665998:CuPr
tdb: tdb:CuPr-96Zhu.tdb:CUPR_B27

TDB models of CUPR_B27 (1): PHASE and CONSTITUENT statements as written

CuPr-96Zhu.tdb: CUPR_B27, type code %, sha256 80386a76c9a9fa0e…

70: PHASE CUPR_B27 % 2 1 1 !
71: CONST CUPR_B27 : CU : PR : !

Example references (1 of 1; 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; reports values for this phase

DHCP (Cu–Pr)

Id: phase:cu-pr:dhcp-a3; status assigned
Structure: alpha-La · A3' · hP4 · P6_3/mmc (194); type st:a3-alpha-la-hp4; tier A: standard phase name; confidence high
Stoichiometry: Pr 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1203 K, x(Pr) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-pr:dhcp-a3, corpus:phase:cu-pr:dhcp
tdb: tdb:CuPr-96Zhu.tdb:DHCP

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

CuPr-96Zhu.tdb: DHCP, type code %, sha256 80386a76c9a9fa0e…

45: PHASE DHCP % 1 1 !
46: CONST DHCP : PR : !

Example references (1 of 1; 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

FCC_A1 (Cu–Pr)

Id: phase:cu-pr:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stoichiometry: Cu 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1367.31 K, x(Pr) 0–0
Literature: 1 values (1 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-pr:fcc-a1
paper: paper:10.1007/bf02665998:Cu(fcc)
tdb: tdb:CuPr-96Zhu.tdb:FCC_A1

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

CuPr-96Zhu.tdb: FCC_A1, type code %A, sha256 80386a76c9a9fa0e…

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

Example references (1 of 1; 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; reports values for this phase

HCP_A3 (Cu–Pr)

Id: phase:cu-pr:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stoichiometry: Cu 1.0000
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-pr:hcp-a3
tdb: tdb:CuPr-96Zhu.tdb:HCP_A3

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

CuPr-96Zhu.tdb: HCP_A3, type code %A, sha256 80386a76c9a9fa0e…

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

Example references (1 of 1; 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

LIQUID (Cu–Pr)

Id: phase:cu-pr:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 564.75–2500 K, x(Pr) 0–1
Literature: 10 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cu-pr:liquid
paper: paper:10.1007/bf02665998:L, paper:10.1007/bf02665998:liquid
tdb: tdb:CuPr-96Zhu.tdb:LIQUID

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

CuPr-96Zhu.tdb: LIQUID, type code %, sha256 80386a76c9a9fa0e…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : CU PR : !

Example references (1 of 1; 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; 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}
}