Cu–Sc phases

7 phases (tier A 6, liquid 1); 7 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–Sc system page · Markdown · field reference

Phases of the Cu–Sc system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:cu-sc:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300.5–2498.99 K, x(Sc) 0.98615–1	2	2
CU2SC_C11B phase:cu-sc:cu2sc-c11b	MoSi2 · C11_b · tI6 · I4/mmm (139)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1166.01 K, x(Sc) 0.33333–0.33333	6	2
CU4SC_D1A phase:cu-sc:cu4sc-d1a	MoNi4 · D1_a · tI10 · I4/m (87)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1198.03 K, x(Sc) 0.2–0.2	9	2
CUSC_B2 phase:cu-sc:cusc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1401.42 K, x(Sc) 0.5–0.5	9	2
FCC_A1 phase:cu-sc:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1366.7 K, x(Sc) 0–0.005	3	2
HCP_A3 phase:cu-sc:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1634.6 K, x(Sc) 0.98507–1	5	2
LIQUID phase:cu-sc:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 1124.64–2500 K, x(Sc) 0–1	20	2

BCC_A2 (Cu–Sc)

Id: phase:cu-sc: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): 300.5–2498.99 K, x(Sc) 0.98615–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cu-sc:bcc-a2
paper: paper:10.1016/j.jallcom.2009.10.003:βSc
tdb: tdb:CuSc-08GTT.tdb:BCC_A2, tdb:CuSc-10Bo.tdb:BCC_A2

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

CuSc-08GTT.tdb: BCC_A2, type code %, sha256 b0ac063c12480fa6…

32: PHASE BCC_A2 % 2 1 3 !
33: CONST BCC_A2 : CU SC% : VA : !

CuSc-10Bo.tdb: BCC_A2, type code %, sha256 6224a1e249a15cfb…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.10.003 H. Bo, L.B. Liu, Z.P. Jin, Thermodynamic analysis of Al–Sc, Cu–Sc and Al–Cu–Sc system, Journal of Alloys and Compounds 490, 318-325 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/s11106-006-0055-4 M. A. Turchanin, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. I. The copper-scandium system, Powder Metall Met Ceram 45, 143-152 (2006).
cited as the source of values for this phase

CU2SC_C11B (Cu–Sc)

Id: phase:cu-sc:cu2sc-c11b; status assigned
Structure: MoSi2 · C11_b · tI6 · I4/mmm (139); type st:c11-b-mosi2-ti6; tier A: standard phase name; confidence high
Stoichiometry: Cu 0.6667, Sc 0.3333
Stability: stable in 2 of 2 calculated diagram(s): 300–1166.01 K, x(Sc) 0.33333–0.33333
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cu-sc:cu2sc-c11b
paper: paper:10.1016/j.jallcom.2009.10.003:Cu2Sc
tdb: tdb:CuSc-08GTT.tdb:CU2SC_C11B, tdb:CuSc-10Bo.tdb:CU2SC_C11B

TDB models of CU2SC_C11B (2): PHASE and CONSTITUENT statements as written

CuSc-08GTT.tdb: CU2SC_C11B, type code %, sha256 b0ac063c12480fa6…

47: PHASE CU2SC_C11B % 2 2 1 !
48: CONST CU2SC_C11B : CU : SC : !

CuSc-10Bo.tdb: CU2SC_C11B, type code %, sha256 6224a1e249a15cfb…

52: PHASE CU2SC_C11B % 2 2 1 !
53: CONST CU2SC_C11B : CU : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.10.003 H. Bo, L.B. Liu, Z.P. Jin, Thermodynamic analysis of Al–Sc, Cu–Sc and Al–Cu–Sc system, Journal of Alloys and Compounds 490, 318-325 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/s11106-006-0055-4 M. A. Turchanin, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. I. The copper-scandium system, Powder Metall Met Ceram 45, 143-152 (2006).
cited as the source of values for this phase

CU4SC_D1A (Cu–Sc)

Id: phase:cu-sc:cu4sc-d1a; status assigned
Structure: MoNi4 · D1_a · tI10 · I4/m (87); type st:d1-a-moni4-ti10; tier A: standard phase name; confidence high
Stoichiometry: Cu 0.8000, Sc 0.2000
Stability: stable in 2 of 2 calculated diagram(s): 300–1198.03 K, x(Sc) 0.2–0.2
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cu-sc:cu4sc-d1a
paper: paper:10.1016/j.jallcom.2009.10.003:Cu4Sc
tdb: tdb:CuSc-08GTT.tdb:CU4SC_D1A, tdb:CuSc-10Bo.tdb:CU4SC_D1A

TDB models of CU4SC_D1A (2): PHASE and CONSTITUENT statements as written

CuSc-08GTT.tdb: CU4SC_D1A, type code %, sha256 b0ac063c12480fa6…

42: PHASE CU4SC_D1A % 2 4 1 !
43: CONST CU4SC_D1A : CU : SC : !

CuSc-10Bo.tdb: CU4SC_D1A, type code %, sha256 6224a1e249a15cfb…

47: PHASE CU4SC_D1A % 2 4 1 !
48: CONST CU4SC_D1A : CU : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.10.003 H. Bo, L.B. Liu, Z.P. Jin, Thermodynamic analysis of Al–Sc, Cu–Sc and Al–Cu–Sc system, Journal of Alloys and Compounds 490, 318-325 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/s11106-006-0055-4 M. A. Turchanin, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. I. The copper-scandium system, Powder Metall Met Ceram 45, 143-152 (2006).
cited as the source of values for this phase

CUSC_B2 (Cu–Sc)

Id: phase:cu-sc:cusc-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaabsz and oqmd-88926, space group 221
Stoichiometry: Cu 0.5000, Sc 0.5000
Stability: stable in 2 of 2 calculated diagram(s): 300–1401.42 K, x(Sc) 0.5–0.5
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:cu-sc:cusc-b2
mp: mp:mp-aaaaabsz
oqmd: oqmd:oqmd-88926
paper: paper:10.1016/j.jallcom.2009.10.003:CuSc
tdb: tdb:CuSc-08GTT.tdb:CUSC_B2, tdb:CuSc-10Bo.tdb:CUSC_B2

TDB models of CUSC_B2 (2): PHASE and CONSTITUENT statements as written

CuSc-08GTT.tdb: CUSC_B2, type code %, sha256 b0ac063c12480fa6…

52: PHASE CUSC_B2 % 2 1 1 !
53: CONST CUSC_B2 : CU : SC : !

CuSc-10Bo.tdb: CUSC_B2, type code %, sha256 6224a1e249a15cfb…

57: PHASE CUSC_B2 % 2 1 1 !
58: CONST CUSC_B2 : CU : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.10.003 H. Bo, L.B. Liu, Z.P. Jin, Thermodynamic analysis of Al–Sc, Cu–Sc and Al–Cu–Sc system, Journal of Alloys and Compounds 490, 318-325 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/s11106-006-0055-4 M. A. Turchanin, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. I. The copper-scandium system, Powder Metall Met Ceram 45, 143-152 (2006).
cited as the source of values for this phase

FCC_A1 (Cu–Sc)

Id: phase:cu-sc: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): 300–1366.7 K, x(Sc) 0–0.005
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cu-sc:fcc-a1
paper: paper:10.1016/j.jallcom.2009.10.003:Fcc_Cu
tdb: tdb:CuSc-08GTT.tdb:FCC_A1, tdb:CuSc-10Bo.tdb:FCC_A1

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

CuSc-08GTT.tdb: FCC_A1, type code %, sha256 b0ac063c12480fa6…

27: PHASE FCC_A1 % 2 1 1 !
28: CONST FCC_A1 : CU% SC : VA : !

CuSc-10Bo.tdb: FCC_A1, type code %, sha256 6224a1e249a15cfb…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.10.003 H. Bo, L.B. Liu, Z.P. Jin, Thermodynamic analysis of Al–Sc, Cu–Sc and Al–Cu–Sc system, Journal of Alloys and Compounds 490, 318-325 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/s11106-006-0055-4 M. A. Turchanin, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. I. The copper-scandium system, Powder Metall Met Ceram 45, 143-152 (2006).
cited as the source of values for this phase

HCP_A3 (Cu–Sc)

Id: phase:cu-sc: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 2 of 2 calculated diagram(s): 300–1634.6 K, x(Sc) 0.98507–1
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cu-sc:hcp-a3
paper: paper:10.1016/j.jallcom.2009.10.003:αSc
tdb: tdb:CuSc-08GTT.tdb:HCP_A3, tdb:CuSc-10Bo.tdb:HCP_A3

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

CuSc-08GTT.tdb: HCP_A3, type code %, sha256 b0ac063c12480fa6…

37: PHASE HCP_A3 % 2 1 0.5 !
38: CONST HCP_A3 : CU SC% : VA : !

CuSc-10Bo.tdb: HCP_A3, type code %, sha256 6224a1e249a15cfb…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.10.003 H. Bo, L.B. Liu, Z.P. Jin, Thermodynamic analysis of Al–Sc, Cu–Sc and Al–Cu–Sc system, Journal of Alloys and Compounds 490, 318-325 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/s11106-006-0055-4 M. A. Turchanin, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. I. The copper-scandium system, Powder Metall Met Ceram 45, 143-152 (2006).
cited as the source of values for this phase

LIQUID (Cu–Sc)

Id: phase:cu-sc:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1124.64–2500 K, x(Sc) 0–1
Literature: 20 values (20 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cu-sc:liquid
paper: paper:10.1016/j.jallcom.2009.10.003:L
tdb: tdb:CuSc-08GTT.tdb:LIQUID, tdb:CuSc-10Bo.tdb:LIQUID

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

CuSc-08GTT.tdb: LIQUID, type code %, sha256 b0ac063c12480fa6…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : CU SC : !

CuSc-10Bo.tdb: LIQUID, type code %, sha256 6224a1e249a15cfb…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2009.10.003 H. Bo, L.B. Liu, Z.P. Jin, Thermodynamic analysis of Al–Sc, Cu–Sc and Al–Cu–Sc system, Journal of Alloys and Compounds 490, 318-325 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/s11106-006-0055-4 M. A. Turchanin, Phase equilibria and thermodynamics of binary copper systems with 3d-metals. I. The copper-scandium system, Powder Metall Met Ceram 45, 143-152 (2006).
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}
}