Cu–Yb phases

9 phases (tier A 5, 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–Yb system page · Markdown · field reference

Phases of the Cu–Yb system (9)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:cu-yb:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1031.31–1096.99 K, x(Yb) 0.99962–1	0	1
CU2YB phase:cu-yb:cu2yb	Hg2K · oI12 · Imma (74)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1025.43 K, x(Yb) 0.33333–0.33333	4	1
CU5YB_D2D phase:cu-yb:cu5yb-d2d	CaCu5 · D2_d · hP6 · P6/mmm (191)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1151.01 K, x(Yb) 0.16667–0.16667	4	1
CU7YB2 phase:cu-yb:cu7yb2		needs_review	stable in 1 of 1 calculated diagram(s): 300–1095.2 K, x(Yb) 0.22222–0.22222	4	1
CU9YB2 phase:cu-yb:cu9yb2	Cu9Yb2 · mC7448 · C2 (5)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1187.08 K, x(Yb) 0.18182–0.18182	6	1
CUYB_B27 phase:cu-yb:cuyb-b27	FeB · B27 · oP8 · Pnma (62)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–905.19 K, x(Yb) 0.5–0.5	4	1
FCC_A1 phase:cu-yb:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1370 K, x(Yb) 0–1	4	1
HCP_A3 phase:cu-yb: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-yb:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 747.97–2500 K, x(Yb) 0–1	14	1

BCC_A2 (Cu–Yb)

Id: phase:cu-yb: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): 1031.31–1096.99 K, x(Yb) 0.99962–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:cu-yb:bcc-a2
tdb: tdb:CuYb-07Zha.tdb:BCC_A2

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

CuYb-07Zha.tdb: BCC_A2, type code %B, sha256 d08c0b2a0da7e0ac…

40: PHASE BCC_A2 %B 2 1 3 !
41: CONST BCC_A2 : CU YB% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2006.11.003 L.G. Zhang, L.B. Liu, H.S. Liu, Z.P. Jin, Thermodynamic assessment of Cu–Eu and Cu–Yb system, Calphad 31, 264-268 (2007).
assessment that models this phase

CU2YB (Cu–Yb)

Id: phase:cu-yb:cu2yb; 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 (no_on_hull_entry_in_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Cu 0.6667, Yb 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1025.43 K, x(Yb) 0.33333–0.33333
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-yb:cu2yb
paper: paper:10.1016/j.calphad.2006.11.003:Cu2Yb
tdb: tdb:CuYb-07Zha.tdb:CU2YB

TDB models of CU2YB (1): PHASE and CONSTITUENT statements as written

CuYb-07Zha.tdb: CU2YB, type code %, sha256 d08c0b2a0da7e0ac…

65: PHASE CU2YB % 2 2 1 !
66: CONST CU2YB : CU : YB : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2006.11.003 L.G. Zhang, L.B. Liu, H.S. Liu, Z.P. Jin, Thermodynamic assessment of Cu–Eu and Cu–Yb system, Calphad 31, 264-268 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(71)90158-5 A. Iandelli, A. Palenzona, The ytterbium-copper system, Journal of the Less Common Metals 25, 333-335 (1971).
cited as the source of values for this phase

CU5YB_D2D (Cu–Yb)

Id: phase:cu-yb:cu5yb-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: Cu 0.8333, Yb 0.1667
Stability: stable in 1 of 1 calculated diagram(s): 300–1151.01 K, x(Yb) 0.16667–0.16667
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-yb:cu5yb-d2d
paper: paper:10.1016/j.calphad.2006.11.003:Cu5Yb
tdb: tdb:CuYb-07Zha.tdb:CU5YB_D2D

TDB models of CU5YB_D2D (1): PHASE and CONSTITUENT statements as written

CuYb-07Zha.tdb: CU5YB_D2D, type code %, sha256 d08c0b2a0da7e0ac…

50: PHASE CU5YB_D2D % 2 5 1 !
51: CONST CU5YB_D2D : CU : YB : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2006.11.003 L.G. Zhang, L.B. Liu, H.S. Liu, Z.P. Jin, Thermodynamic assessment of Cu–Eu and Cu–Yb system, Calphad 31, 264-268 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(71)90158-5 A. Iandelli, A. Palenzona, The ytterbium-copper system, Journal of the Less Common Metals 25, 333-335 (1971).
cited as the source of values for this phase

CU7YB2 (Cu–Yb)

Id: phase:cu-yb:cu7yb2; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (Cu7Yb2) · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): (Cu7Yb2) — Hallstedt 2025 mmc2 row for CU7YB2: Cu7Yb2
Stoichiometry: Cu 0.7778, Yb 0.2222
Stability: stable in 1 of 1 calculated diagram(s): 300–1095.2 K, x(Yb) 0.22222–0.22222
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-yb:cu7yb2
paper: paper:10.1016/j.calphad.2006.11.003:Cu7Yb2
tdb: tdb:CuYb-07Zha.tdb:CU7YB2

TDB models of CU7YB2 (1): PHASE and CONSTITUENT statements as written

CuYb-07Zha.tdb: CU7YB2, type code %, sha256 d08c0b2a0da7e0ac…

60: PHASE CU7YB2 % 2 7 2 !
61: CONST CU7YB2 : CU : YB : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2006.11.003 L.G. Zhang, L.B. Liu, H.S. Liu, Z.P. Jin, Thermodynamic assessment of Cu–Eu and Cu–Yb system, Calphad 31, 264-268 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(71)90158-5 A. Iandelli, A. Palenzona, The ytterbium-copper system, Journal of the Less Common Metals 25, 333-335 (1971).
cited as the source of values for this phase

CU9YB2 (Cu–Yb)

Id: phase:cu-yb:cu9yb2; status assigned
Structure: Cu9Yb2 · mC7448 · C2 (5); type st:cu9yb2-mc7448; 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 0.8182, Yb 0.1818
Stability: stable in 1 of 1 calculated diagram(s): 300–1187.08 K, x(Yb) 0.18182–0.18182
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-yb:cu9yb2
paper: paper:10.1016/j.calphad.2006.11.003:Cu9Yb2
tdb: tdb:CuYb-07Zha.tdb:CU9YB2

TDB models of CU9YB2 (1): PHASE and CONSTITUENT statements as written

CuYb-07Zha.tdb: CU9YB2, type code %, sha256 d08c0b2a0da7e0ac…

55: PHASE CU9YB2 % 2 9 2 !
56: CONST CU9YB2 : CU : YB : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2006.11.003 L.G. Zhang, L.B. Liu, H.S. Liu, Z.P. Jin, Thermodynamic assessment of Cu–Eu and Cu–Yb system, Calphad 31, 264-268 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(71)90158-5 A. Iandelli, A. Palenzona, The ytterbium-copper system, Journal of the Less Common Metals 25, 333-335 (1971).
cited as the source of values for this phase

CUYB_B27 (Cu–Yb)

Id: phase:cu-yb:cuyb-b27; status assigned
Structure: FeB · B27 · oP8 · Pnma (62); type st:b27-feb-op8; tier A: standard phase name; confidence high
Stoichiometry: Cu 0.5000, Yb 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–905.19 K, x(Yb) 0.5–0.5
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-yb:cuyb-b27
paper: paper:10.1016/j.calphad.2006.11.003:CuYb
tdb: tdb:CuYb-07Zha.tdb:CUYB_B27

TDB models of CUYB_B27 (1): PHASE and CONSTITUENT statements as written

CuYb-07Zha.tdb: CUYB_B27, type code %, sha256 d08c0b2a0da7e0ac…

70: PHASE CUYB_B27 % 2 1 1 !
71: CONST CUYB_B27 : CU : YB : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2006.11.003 L.G. Zhang, L.B. Liu, H.S. Liu, Z.P. Jin, Thermodynamic assessment of Cu–Eu and Cu–Yb system, Calphad 31, 264-268 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(71)90158-5 A. Iandelli, A. Palenzona, The ytterbium-copper system, Journal of the Less Common Metals 25, 333-335 (1971).
cited as the source of values for this phase

FCC_A1 (Cu–Yb)

Id: phase:cu-yb: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): 300–1370 K, x(Yb) 0–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cu-yb:fcc-a1
paper: paper:10.1016/j.calphad.2006.11.003:FCC(Cu), paper:10.1016/j.calphad.2006.11.003:FCC(Yb)
tdb: tdb:CuYb-07Zha.tdb:FCC_A1

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

CuYb-07Zha.tdb: FCC_A1, type code %A, sha256 d08c0b2a0da7e0ac…

35: PHASE FCC_A1 %A 2 1 1 !
36: CONST FCC_A1 : CU% YB% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2006.11.003 L.G. Zhang, L.B. Liu, H.S. Liu, Z.P. Jin, Thermodynamic assessment of Cu–Eu and Cu–Yb system, Calphad 31, 264-268 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(71)90158-5 A. Iandelli, A. Palenzona, The ytterbium-copper system, Journal of the Less Common Metals 25, 333-335 (1971).
cited as the source of values for this phase

HCP_A3 (Cu–Yb)

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

Names (2): corpus: corpus:phase:cu-yb:hcp-a3
tdb: tdb:CuYb-07Zha.tdb:HCP_A3

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

CuYb-07Zha.tdb: HCP_A3, type code %A, sha256 d08c0b2a0da7e0ac…

45: PHASE HCP_A3 %A 2 1 0.5 !
46: CONST HCP_A3 : CU YB : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2006.11.003 L.G. Zhang, L.B. Liu, H.S. Liu, Z.P. Jin, Thermodynamic assessment of Cu–Eu and Cu–Yb system, Calphad 31, 264-268 (2007).
assessment that models this phase

LIQUID (Cu–Yb)

Id: phase:cu-yb:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 747.97–2500 K, x(Yb) 0–1
Literature: 14 values (14 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-yb:liquid
paper: paper:10.1016/j.calphad.2006.11.003:L
tdb: tdb:CuYb-07Zha.tdb:LIQUID

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

CuYb-07Zha.tdb: LIQUID, type code %, sha256 d08c0b2a0da7e0ac…

30: PHASE LIQUID:L % 1 1 !
31: CONST LIQUID:L : CU YB : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2006.11.003 L.G. Zhang, L.B. Liu, H.S. Liu, Z.P. Jin, Thermodynamic assessment of Cu–Eu and Cu–Yb system, Calphad 31, 264-268 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(71)90158-5 A. Iandelli, A. Palenzona, The ytterbium-copper system, Journal of the Less Common Metals 25, 333-335 (1971).
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}
}