Cu–Ir system

33 accepted literature values from 1 paper(s) (experimental 8, model 15, unspecified 10); 2 calculated phase diagram(s). 3 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 (4) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	8
model	15
unspecified	10

Accepted values by property group
Property group	Values
phase equilibrium	24
activity / EMF / Gibbs energy	1
crystal structure	8

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
CuIr-04Kor-LB.tdb	J. Korb, unpublished work, GTT, 2004.	`bc7d8e92a01c7ed06d721d920a89d9758432138326a7b50dbffdc4a44fe9349b`	viewer · TDB · JSON
CuIr-87Cha.tdb	D.J. Chakrabarti, D.E. Laughlin, Bull. Alloy Phase Diag., 8, 132-36(1987). doi:10.1007/BF02873198	`f9fe888f4dc6f8ff7058c3ba7c9f7aaa7ee7b95ed9ffe8a038f8636604b1769b`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CuIr-04Kor-LB.tdb	1418.24	LIQUID (x(Ir) 0.04212) + FCC_A1#2 (x(Ir) 0.10024) + FCC_A1 (x(Ir) 0.96687)
CuIr-87Cha.tdb	1403.89	LIQUID (x(Ir) 0.03221) + FCC_A1#2 (x(Ir) 0.0786) + FCC_A1 (x(Ir) 0.97024)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CuIr-87Cha

Other properties

Phase equilibrium (24)

Phase equilibrium, Cu–Ir system
Property	T (K)	Phases / composition	Class	Source	Location
Phase composition	773.15	(Cu) + (Ir) (Cu): Cu 0.994, Ir 0.006; (Ir): Cu 0.001, Ir 0.999	model	[1] Chakrabarti 1987	Table 1, p. 2, row 24 report
Phase composition	973.15	(Cu) (Cu): Cu 0.969, Ir 0.031	experimental	[1] Chakrabarti 1987 cites ref. 69Rau	Table 1, p. 2, row 10 report
Phase composition	973.15	(Cu) + (Ir) (Cu): Cu 0.981, Ir 0.019; (Ir): Cu 0.005, Ir 0.995	model	[1] Chakrabarti 1987	Table 1, p. 2, row 23 report
Phase composition	1073.15	(Cu) + (Ir) (Cu): Cu 0.972, Ir 0.028; (Ir): Cu 0.008, Ir 0.992	model	[1] Chakrabarti 1987	Table 1, p. 2, row 22 report
Phase composition	1073.15	(Ir) (Ir): Cu 0.014, Ir 0.986	experimental	[1] Chakrabarti 1987 cites ref. 69Rau	Table 1, p. 2, row 9 report
Phase composition	1133.15	(Cu) (Cu): Cu 0.945, Ir 0.055	experimental	[1] Chakrabarti 1987 cites ref. 69Rau	Table 1, p. 2, row 8 report
Phase composition	1173.15	(Cu) + (Ir) (Cu): Cu 0.959, Ir 0.041; (Ir): Cu 0.013, Ir 0.987	model	[1] Chakrabarti 1987	Table 1, p. 2, row 21 report
Phase composition	1293.15	(Cu) (Cu): Cu 0.935, Ir 0.065	experimental	[1] Chakrabarti 1987 cites ref. 69Rau	Table 1, p. 2, row 7 report
Phase composition	1358.02	Liquidus + Solidus + L + (Cu) Liquidus: Cu 1, Ir 0; Solidus: Cu 1, Ir 0; L: Cu 1, Ir 0; (Cu): Cu 1, Ir 0	unspecified	[1] Chakrabarti 1987	Table 1, p. 2, row 2 report
Phase composition	1363.15	(Ir) (Ir): Cu 0.03, Ir 0.97	experimental	[1] Chakrabarti 1987 cites ref. 69Rau	Table 1, p. 2, row 6 report
Phase composition	1373.15	(Cu) + (Ir) (Cu): Cu 0.927, Ir 0.073; (Ir): Cu 0.027, Ir 0.973	model	[1] Chakrabarti 1987	Table 1, p. 2, row 20 report
Phase composition	1411.15	(Cu) + (Ir) (Cu): Cu 0.92, Ir 0.08; (Ir): Cu 0.03, Ir 0.97	model	[1] Chakrabarti 1987	Table 1, p. 2, row 19 report
Phase composition	1411.15	Liquidus + Solidus + L + (Ir) Liquidus: Cu 0.96, Ir 0.04; Solidus: Cu 0.03, Ir 0.97; L: Cu 0.96, Ir 0.04; (Ir): Cu 0.03, Ir 0.97	model	[1] Chakrabarti 1987	Table 1, p. 2, row 18 report
Phase composition	1473.15	Liquidus + Solidus + L + (Ir) Liquidus: Cu 0.95, Ir 0.05; Solidus: Cu 0.034, Ir 0.966; L: Cu 0.95, Ir 0.05; (Ir): Cu 0.034, Ir 0.966	model	[1] Chakrabarti 1987	Table 1, p. 2, row 17 report
Phase composition	1473.15	Solidus + (Ir) Solidus: Cu 0.032, Ir 0.968; (Ir): Cu 0.032, Ir 0.968	experimental	[1] Chakrabarti 1987 cites ref. 69Rau	Table 1, p. 2, row 5 report
Phase composition	1673.15	Liquidus + Solidus + L + (Ir) Liquidus: Cu 0.905, Ir 0.095; Solidus: Cu 0.046, Ir 0.954; L: Cu 0.905, Ir 0.095; (Ir): Cu 0.046, Ir 0.954	model	[1] Chakrabarti 1987	Table 1, p. 2, row 16 report
Phase composition	1673.15	Solidus + (Ir) Solidus: Cu 0.051, Ir 0.949; (Ir): Cu 0.051, Ir 0.949	experimental	[1] Chakrabarti 1987 cites ref. 69Rau	Table 1, p. 2, row 4 report
Phase composition	1873.15	Liquidus + Solidus + L + (Ir) Liquidus: Cu 0.827, Ir 0.173; Solidus: Cu 0.057, Ir 0.943; L: Cu 0.827, Ir 0.173; (Ir): Cu 0.057, Ir 0.943	model	[1] Chakrabarti 1987	Table 1, p. 2, row 15 report
Phase composition	1873.15	Solidus + (Ir) Solidus: Cu 0.073, Ir 0.927; (Ir): Cu 0.073, Ir 0.927	experimental	[1] Chakrabarti 1987 cites ref. 69Rau	Table 1, p. 2, row 3 report
Phase composition	2073.15	Liquidus + Solidus + L + (Ir) Liquidus: Cu 0.678, Ir 0.322; Solidus: Cu 0.063, Ir 0.937; L: Cu 0.678, Ir 0.322; (Ir): Cu 0.063, Ir 0.937	model	[1] Chakrabarti 1987	Table 1, p. 2, row 14 report
Phase composition	2273.15	Liquidus + Solidus + L + (Ir) Liquidus: Cu 0.39, Ir 0.61; Solidus: Cu 0.057, Ir 0.943; L: Cu 0.39, Ir 0.61; (Ir): Cu 0.057, Ir 0.943	model	[1] Chakrabarti 1987	Table 1, p. 2, row 13 report
Phase composition	2473.15	Liquidus + Solidus + L + (Ir) Liquidus: Cu 0.171, Ir 0.829; Solidus: Cu 0.037, Ir 0.963; L: Cu 0.171, Ir 0.829; (Ir): Cu 0.037, Ir 0.963	model	[1] Chakrabarti 1987	Table 1, p. 2, row 12 report
Phase composition	2673.15	Liquidus + Solidus + L + (Ir) Liquidus: Cu 0.028, Ir 0.972; Solidus: Cu 0.007, Ir 0.993; L: Cu 0.028, Ir 0.972; (Ir): Cu 0.007, Ir 0.993	model	[1] Chakrabarti 1987	Table 1, p. 2, row 11 report
Phase composition	2720.15	Liquidus + Solidus + L + (Ir) Liquidus: Cu 0, Ir 1; Solidus: Cu 0, Ir 1; L: Cu 0, Ir 1; (Ir): Cu 0, Ir 1	unspecified	[1] Chakrabarti 1987	Table 1, p. 2, row 1 report

Activity / EMF / Gibbs energy (1)

Activity / EMF / Gibbs energy, Cu–Ir system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Gibbs energy printed: G (L)	-0.59 kJ/mol	1273.15		model	[1] Chakrabarti 1987	p. 4 report	The corresponding integral molar Gibbs energy G (L) (based on pure liquid Cu and pure liquid Ir as standard states), estimated at 1000 ~ is -0.59 kJ/mol.

Crystal structure (8)

Crystal structure, Cu–Ir system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	3.836 Å	1073.15	(Ir) alloy: Cu 0.6, Ir 0.4	unspecified	[1] Chakrabarti 1987 cites ref. 69Rau	Table 3, p. 3, row 7 report
Lattice a	3.623 Å	1133.15	(Cu) alloy: Cu 0.97, Ir 0.03	unspecified	[1] Chakrabarti 1987 cites ref. 69Rau	Table 3, p. 3, row 3 report
Lattice a	3.625 Å	1133.15	(Cu) alloy: Cu 0.96, Ir 0.04	unspecified	[1] Chakrabarti 1987 cites ref. 69Rau	Table 3, p. 3, row 4 report
Lattice a	3.629 Å	1133.15	(Cu) alloy: Cu 0.95, Ir 0.05	unspecified	[1] Chakrabarti 1987 cites ref. 69Rau	Table 3, p. 3, row 5 report
Lattice a	3.621 Å	1133.15	(Cu) alloy: Cu 0.98, Ir 0.02	unspecified	[1] Chakrabarti 1987 cites ref. 69Rau	Table 3, p. 3, row 2 report
Lattice a	3.832 Å	1473.15	(Ir) alloy: Cu 0.4, Ir 0.6	unspecified	[1] Chakrabarti 1987 cites ref. 69Rau	Table 3, p. 3, row 8 report
Lattice a	3.828 Å	1673.15	(Ir) alloy: Cu 0.4, Ir 0.6	unspecified	[1] Chakrabarti 1987 cites ref. 69Rau	Table 3, p. 3, row 9 report
Lattice a	3.823 Å	1873.15	(Ir) alloy: Cu 0.4, Ir 0.6	unspecified	[1] Chakrabarti 1987 cites ref. 69Rau	Table 3, p. 3, row 10 report

Sources

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

D. J. Chakrabarti, D. E. Laughlin, The Cu−Ir (Copper-Iridium) system, JPE 8, 132-136 (1987). doi:10.1007/bf02873198

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}
}