Ca–Cu system

5 accepted literature values from 1 paper(s) (experimental 5); 2 calculated phase diagram(s). 2 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (7) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	5

Accepted values by property group
Property group	Values
invariant reaction	4
phase transition	1

Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
CaCu-96Ris-LB.tdb	D. Risold, B. Hallstedt, L.J. Gauckler, H.L. Lukas, S.G. Fries, Calphad, 20, 151-60(1996). doi:10.1016/S0364-5916(96)00022-3	`a46c915ad7d9c07f06eb20075234b10325f5cfe86b6e5e057e6978a21830eb90`	viewer · TDB · JSON
CaCu-97Ais.tdb	K. El Aissaoui, N. Selhaoui, J. Charles, L. Bouirden, Ann. Chim. Sci. Mater., 22, 517-27(1997).	`649c86c7eee5fdbf70dedfa7cc51bcd3ffe284eac3dd55aa492b8d0c4ae68112`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CaCu-96Ris-LB.tdb	1182.37	CACU5_D2D (x(Cu) 0.83333) + LIQUID (x(Cu) 0.9015) + FCC_A1 (x(Cu) 0.99939)
CaCu-96Ris-LB.tdb	1182.37	CACU5_D2D (x(Cu) 0.83333) + LIQUID (x(Cu) 0.90164) + FCC_A1 (x(Cu) 0.99939)
CaCu-96Ris-LB.tdb	840.48	CACU (x(Cu) 0.5) + LIQUID (x(Cu) 0.51852) + CACU5_D2D (x(Cu) 0.83333)
CaCu-96Ris-LB.tdb	840.48	CACU (x(Cu) 0.5) + LIQUID (x(Cu) 0.51902) + CACU5_D2D (x(Cu) 0.83333)
CaCu-96Ris-LB.tdb	762	LIQUID (x(Cu) 0.30154) + CA2CU (x(Cu) 0.33333) + CACU (x(Cu) 0.5)
CaCu-96Ris-LB.tdb	762	LIQUID (x(Cu) 0.3019) + CA2CU (x(Cu) 0.33333) + CACU (x(Cu) 0.5)
CaCu-96Ris-LB.tdb	753.69	BCC_A2 (x(Cu) 0) + LIQUID (x(Cu) 0.26242) + CA2CU (x(Cu) 0.33333)
CaCu-96Ris-LB.tdb	753.69	BCC_A2 (x(Cu) 0) + LIQUID (x(Cu) 0.26236) + CA2CU (x(Cu) 0.33333)
CaCu-96Ris-LB.tdb	753.69	BCC_A2 (x(Cu) 0) + LIQUID (x(Cu) 0.26234) + CA2CU (x(Cu) 0.33333)
CaCu-96Ris-LB.tdb	753.69	BCC_A2 (x(Cu) 0) + LIQUID (x(Cu) 0.26228) + CA2CU (x(Cu) 0.33333)
CaCu-96Ris-LB.tdb	725.6	BCC_A2 (x(Cu) 0) + FCC_A1 (x(Cu) 0.00207) + CA2CU (x(Cu) 0.33333)
CaCu-96Ris-LB.tdb	725.6	BCC_A2 (x(Cu) 0) + FCC_A1 (x(Cu) 0.00206) + CA2CU (x(Cu) 0.33333)
CaCu-96Ris-LB.tdb	725.6	BCC_A2 (x(Cu) 0) + FCC_A1 (x(Cu) 0.00206) + CA2CU (x(Cu) 0.33333)
CaCu-96Ris-LB.tdb	725.6	BCC_A2 (x(Cu) 0) + FCC_A1 (x(Cu) 0.00206) + CA2CU (x(Cu) 0.33333)
CaCu-97Ais.tdb	1185.58	CACU5_D2D (x(Cu) 0.83333) + LIQUID (x(Cu) 0.8983) + FCC_A1 (x(Cu) 1)
CaCu-97Ais.tdb	1185.58	CACU5_D2D (x(Cu) 0.83333) + LIQUID (x(Cu) 0.89834) + FCC_A1 (x(Cu) 1)
CaCu-97Ais.tdb	1185.58	CACU5_D2D (x(Cu) 0.83333) + LIQUID (x(Cu) 0.89842) + FCC_A1 (x(Cu) 1)
CaCu-97Ais.tdb	838.46	LIQUID (x(Cu) 0.49664) + CACU (x(Cu) 0.5) + CACU5_D2D (x(Cu) 0.83333)
CaCu-97Ais.tdb	838.46	LIQUID (x(Cu) 0.49709) + CACU (x(Cu) 0.5) + CACU5_D2D (x(Cu) 0.83333)
CaCu-97Ais.tdb	785.47	LIQUID (x(Cu) 0.2795) + CA2CU (x(Cu) 0.33333) + CACU (x(Cu) 0.5)
CaCu-97Ais.tdb	785.25	BCC_A2 (x(Cu) 1.000e-5) + LIQUID (x(Cu) 0.27808) + CA2CU (x(Cu) 0.33333)
CaCu-97Ais.tdb	716.04	BCC_A2 (x(Cu) 0) + FCC_A1 (x(Cu) 1.000e-5) + CA2CU (x(Cu) 0.33333)
CaCu-97Ais.tdb	470.01	FCC_A1 (x(Cu) 0) + CA2CU (x(Cu) 0.33333) + CACU (x(Cu) 0.5)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CaCu-96Ris-LB

Invariant reactions (literature)

Invariant reactions reported in the literature for the Ca–Cu system (4)
T (K)	Reaction / phases	Class	Source	Location	Quote
1190	eutectic	experimental	[1] Risold 1996 cites ref. 7	p. 2 report	The eutectic reaction L ++ Cu+CaCus was observed at 1190 K [7lBru] and 1178 K [80Kuz], and both studies agree on a eutectic composition near ZQ, = 0.90 for the liquid.
1178	eutectic	experimental	[1] Risold 1996 cites ref. 80Kuz	p. 2 report	The eutectic reaction L ++ Cu+CaCus was observed at 1190 K [7lBru] and 1178 K [80Kuz], and both studies agree on a eutectic composition near ZQ, = 0.90 for the liquid.
840	peritectic	experimental	[1] Risold 1996	p. 2 report	The other compounds were found by Bruzzone to form peritectically, CaCu at 840 K and CasCu at 761 K.
755	eutectic	experimental	[1] Risold 1996	p. 2 report	The eutectic reaction involving CazCu and Ca occured at 755 K with the liquid composition of about xoU = 0.24.

Other properties

Phase transition (1)

Phase transition, Ca–Cu system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	1223 K	1223	congruent melting	experimental	[1] Risold 1996	p. 2 report	Bruzzone and Kuznetzov et al. report in perfect agreement that CaCus melts congruently at 1223 K.

Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

Daniel Risold, Bengt Hallstedt, Ludwig J. Gauckler, Hans Leo Lukas, Suzana G. Fries, Thermodynamic optimization of the Ca-Cu and Sr-Cu systems, Calphad 20, 151-160 (1996). doi:10.1016/s0364-5916(96)00022-3

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735859
R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735891
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 the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); 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). 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_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@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}
}