Co–Pt system

18 accepted literature values from 1 paper(s) (experimental 10, model 2, DFT 6); 3 calculated phase diagram(s). 1 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	10
model	2
DFT	6

Accepted values by property group
Property group	Values
phase transition	3
formation	3
mixing / partial	1
crystal structure	10
other property	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
CoPt-01Oik.tdb	K. Oikawa, G.W. Qin, T. Ikeshoji, O. Kitakami, Y. Shimada, K. Ishida, K. Fukamichi, J. Magn. Magn. Mater., 236, 220-33(2001). doi:10.1016/S0304-8853(00)00520-5	`adf708dbafc5b2c33e1c38c29470eecad45f99bc0f546e31c1dc5b079e13b2bd`	viewer · TDB · JSON
CoPt-11Kim.tdb	D. Kim, J.E. Saal, L. Zhou, S. Shang, Y. Du, Z.-K. Liu, Calphad, 35, 323-30(2011). doi:10.1016/j.calphad.2011.04.005	`335cf2628217f37fe82d25ddcd19a8fc5d7d507ef2e61b63faf15962523eced6`	viewer · TDB · JSON
CoPt-90Spe-LB.tdb	P.J. Spencer, unpublished, 1990.	`8a9bf4d4f4636b8994e37943ba8aff05c80e6d02794f1c610e7343ae0dee89c6`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CoPt-11Kim.tdb	962.79	FCC_4SL (x(Pt) 0.57621) + FCC_4SL#2 (x(Pt) 0.61122) + FCC_4SL#3 (x(Pt) 0.6201)
CoPt-11Kim.tdb	962.79	FCC_4SL (x(Pt) 0.57621) + FCC_A1 (x(Pt) 0.61122) + FCC_4SL#2 (x(Pt) 0.6201)
CoPt-11Kim.tdb	652.1	HCP_A3 (x(Pt) 0.15243) + FCC_A1 (x(Pt) 0.16793) + FCC_4SL (x(Pt) 0.22638)
CoPt-11Kim.tdb	652.1	HCP_A3 (x(Pt) 0.15243) + FCC_4SL#2 (x(Pt) 0.16793) + FCC_4SL (x(Pt) 0.22638)
CoPt-90Spe-LB.tdb	673.57	HCP_A3 (x(Pt) 0.36339) + FCC_A1 (x(Pt) 0.37848) + COPT_L10 (x(Pt) 0.39722)
CoPt-90Spe-LB.tdb	446.9	COPT_L10 (x(Pt) 0.63247) + FCC_A1 (x(Pt) 0.65973) + COPT3_L12 (x(Pt) 0.69701)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CoPt-01Oik · CALPHAD hull CoPt-90Spe-LB

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, Co–Pt system (3)
Phase	Value	T (K)	Class	Source	Location
CoPt	-13.6 per mol-atom ± 0.7	914	experimental	[1] Kim 2011 cites Oriani 1962 doi	Table 2, p. 3, row 16 report
CoPt	-12.265 kJ/mol-atom	914	DFT	[1] Kim 2011	Table 2, p. 3, row 15 report
CoPt3	-12.8 per mol-atom ± 1.63	914	experimental	[1] Kim 2011 cites Oriani 1962 doi	Table 2, p. 3, row 16 report

Other properties

Phase transition (3)

Phase transition, Co–Pt system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	822 K	822	Co3Pt	model	[1] Kim 2011	p. 5 report	Co3 Pt is predicted to be stable up to about 822 K.
Phase transition	840 K	840	congruent transformation	experimental	[1] Kim 2011 cites Inden 1983	p. 5 report	This behavior is similar to that measured by Inden [25] with a congruent temperature of approximately 840 K.
Phase transition	1104 K	1104	other	experimental	[1] Kim 2011	p. 6 report	The calculated LRO parameter for L10 according to Eq. (12) is plotted in Fig. 9 along with the experimental data [24] with the temperature normalized by the order/disorder transition temperature of the L10 CoPt phase of 1104 K, showing a good agreement.

Mixing / partial (1)

Mixing / partial, Co–Pt system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Enthalpy of mixing printed: ΔHmix	-8.651 kJ/mol-atom	300	Co3Pt alloy: Pt 0.25	DFT	[1] Kim 2011	Table 2, p. 3, row 17 report

Crystal structure (10)

Crystal structure, Co–Pt system
Property	Value	Phases / composition	Class	Source	Location
Lattice a printed: a	3.654 Å	Co3Pt alloy: Pt 0.25	DFT	[1] Kim 2011	Table 2, p. 3, row 1 report
Lattice a printed: a	3.664 Å	Co3Pt alloy: Pt 0.25	experimental	[1] Kim 2011 cites Capitan 1999 doi	Table 2, p. 3, row 2 report
Lattice a printed: a	3.806 Å	CoPt alloy: Pt 0.5	experimental	[1] Kim 2011 cites Galanakis 2000 doi	Table 2, p. 3, row 3 report
Lattice a printed: a	3.809 Å	CoPt alloy: Pt 0.5	DFT	[1] Kim 2011	Table 2, p. 3, row 1 report
Lattice a printed: a	3.811 Å	CoPt alloy: Pt 0.5	experimental	[1] Kim 2011 cites Capitan 1999 doi	Table 2, p. 3, row 2 report
Lattice a printed: a	3.885 Å	CoPt3 alloy: Pt 0.75	DFT	[1] Kim 2011	Table 2, p. 3, row 1 report
Lattice a printed: a	3.857 Å	CoPt3 alloy: Pt 0.75	experimental	[1] Kim 2011 cites Capitan 1999 doi	Table 2, p. 3, row 2 report
Lattice c printed: c	3.708 Å	CoPt alloy: Pt 0.5	DFT	[1] Kim 2011	Table 2, p. 3, row 4 report
Lattice c printed: c	3.684 Å	CoPt alloy: Pt 0.5	experimental	[1] Kim 2011 cites Galanakis 2000 doi	Table 2, p. 3, row 6 report
Lattice c printed: c	3.694 Å	CoPt alloy: Pt 0.5	experimental	[1] Kim 2011 cites Leroux 1988	Table 2, p. 3, row 5 report

Other property (1)

Other property, Co–Pt system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Other printed: enthalpy of transformation	-3.303 kJ/mol-atom	783	L10 + fcc	model	[1] Kim 2011	p. 5 report	The calculated enthalpy for the disordered fcc phase to L10 transformation in CoPt compound at 783 K from the current modeling is -3.303 kJ/mol-atom which is also in a good agreement with the experimental data (-3.1 ± 0.2 kJ/mol-atom) in the literature [16].

Sources

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

DongEung Kim, James E. Saal, Liangcai Zhou, ShunLi Shang, Yong Du, Zi-Kui Liu, Thermodynamic modeling of fcc order/disorder transformations in the Co–Pt system, Calphad 35, 323-330 (2011). doi:10.1016/j.calphad.2011.04.005

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}
}