Cu–S system

23 accepted literature values from 1 paper(s) (experimental 12, model 11); 3 calculated phase diagram(s). 12 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 (14) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	12
model	11

Accepted values by property group
Property group	Values
invariant reaction	19
phase transition	4

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
CuS-07Lee.tdb	B.-J. Lee, B. Sundman, S.I. Kim, K.-G. Chin, ISIJ Int., 47, 163-71(2007). doi:10.2355/isijinternational.47.163	`d5d1065a84e9aabe84f1a0d2ad1ffe56d89e9dbc799ad90b44c16f840b0275a0`	viewer · TDB · JSON
CuS-92Sun-LB.tdb	B. Sundman, unpublished, 1992.	`b8d5ff92c7cc3e8388cd43eed138d371e60c79cb9b044dfda0d7c3328bcb0726`	viewer · TDB · JSON
CuS-92Sun-newS.tdb	B. Sundman, unpublished, 1992.	`137242d5bf305aadb1a044623c566cbe19778f1612775076add29b4808d1b3ff`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CuS-07Lee.tdb	1409.44	LIQUID#2 (x(S) 0.022) + LIQUID (x(S) 0.33136) + CU2S_GAMMA (x(S) 0.33301)
CuS-07Lee.tdb	1342.28	FCC_A1 (x(S) 2.300e-4) + LIQUID (x(S) 0.0141) + CU2S_GAMMA (x(S) 0.33314)
CuS-07Lee.tdb	1236.55	CU2S_GAMMA (x(S) 0.34888) + LIQUID (x(S) 0.37241) + GAS (x(S) 1)
CuS-07Lee.tdb	766.66	CU2S_GAMMA (x(S) 0.36861) + CUS_B18 (x(S) 0.5) + GAS (x(S) 1)
CuS-07Lee.tdb	723.86	CUS_B18 (x(S) 0.5) + LIQUID (x(S) 0.99996) + GAS (x(S) 1)
CuS-07Lee.tdb	707.74	FCC_A1 (x(S) 0) + CU2S_BETA (x(S) 0.33333) + CU2S_GAMMA (x(S) 0.33342)
CuS-07Lee.tdb	384.34	CUS_B18 (x(S) 0.5) + ORTHORHOMBIC_A16 (x(S) 1) + LIQUID (x(S) 1)
CuS-07Lee.tdb	379.45	FCC_A1 (x(S) 0) + CU2S_ALPHA (x(S) 0.33333) + CU2S_BETA (x(S) 0.33333)
CuS-07Lee.tdb	379.45	CU2S_BETA (x(S) 0.33333) + CU2S_ALPHA (x(S) 0.33333) + CU2S_GAMMA (x(S) 0.35194)
CuS-07Lee.tdb	367.17	CU2S_ALPHA (x(S) 0.33333) + CU31S16 (x(S) 0.3413) + CU2S_GAMMA (x(S) 0.35287)
CuS-07Lee.tdb	350.02	CU2S_GAMMA (x(S) 0.35915) + CU7S4 (x(S) 0.36364) + CUS_B18 (x(S) 0.5)
CuS-07Lee.tdb	343.58	CU31S16 (x(S) 0.3413) + CU2S_GAMMA (x(S) 0.35609) + CU7S4 (x(S) 0.36364)
CuS-92Sun-LB.tdb	1377.51	ION#2 (x(S) 0.02066) + ION (x(S) 0.32881) + CU2S_GAMMA (x(S) 0.33312)
CuS-92Sun-LB.tdb	1338.66	FCC_A1 (x(S) 1.900e-4) + ION (x(S) 0.01729) + CU2S_GAMMA (x(S) 0.33317)
CuS-92Sun-LB.tdb	779.75	CU2S_GAMMA (x(S) 0.36474) + CUS_B18 (x(S) 0.5) + LIQUID (x(S) 0.99983)
CuS-92Sun-LB.tdb	710.34	FCC_A1 (x(S) 0) + CU2S_BETA (x(S) 0.33333) + CU2S_GAMMA (x(S) 0.33341)
CuS-92Sun-LB.tdb	388.35	CUS_B18 (x(S) 0.5) + MONOCLINIC_S (x(S) 1) + LIQUID (x(S) 1)
CuS-92Sun-LB.tdb	375.97	FCC_A1 (x(S) 0) + CU2S_ALPHA (x(S) 0.33333) + CU2S_BETA (x(S) 0.33333)
CuS-92Sun-LB.tdb	375.97	CU2S_BETA (x(S) 0.33333) + CU2S_ALPHA (x(S) 0.33333) + CU2S_GAMMA (x(S) 0.34555)
CuS-92Sun-LB.tdb	371.96	CU2S_ALPHA (x(S) 0.33333) + CU31S16 (x(S) 0.3413) + CU2S_GAMMA (x(S) 0.34634)
CuS-92Sun-LB.tdb	368.33	CUS_B18 (x(S) 0.5) + ORTHORHOMBIC_A16 (x(S) 1) + MONOCLINIC_S (x(S) 1)
CuS-92Sun-LB.tdb	325.41	CU31S16 (x(S) 0.3413) + CU2S_GAMMA (x(S) 0.35752) + CUS_B18 (x(S) 0.5)
CuS-92Sun-LB.tdb	311.97	CU31S16 (x(S) 0.3413) + CU7S4 (x(S) 0.36364) + CUS_B18 (x(S) 0.5)
CuS-92Sun-newS.tdb	1338.03	FCC_A1 (x(S) 1.900e-4) + ION#2 (x(S) 0.01791) + ION (x(S) 0.32938)
CuS-92Sun-newS.tdb	1314	FCC_A1 (x(S) 1.600e-4) + ION (x(S) 0.32982) + CU2S_GAMMA (x(S) 0.33323)
CuS-92Sun-newS.tdb	771.29	CU2S_GAMMA (x(S) 0.3646) + CUS_B18 (x(S) 0.5) + LIQUID (x(S) 0.99984)
CuS-92Sun-newS.tdb	710.93	FCC_A1 (x(S) 0) + CU2S_BETA (x(S) 0.33333) + CU2S_GAMMA (x(S) 0.33341)
CuS-92Sun-newS.tdb	384.34	CUS_B18 (x(S) 0.5) + ORTHORHOMBIC_A16 (x(S) 1) + LIQUID (x(S) 1)
CuS-92Sun-newS.tdb	375.97	FCC_A1 (x(S) 0) + CU2S_ALPHA (x(S) 0.33333) + CU2S_BETA (x(S) 0.33333)
CuS-92Sun-newS.tdb	375.97	CU2S_BETA (x(S) 0.33333) + CU2S_ALPHA (x(S) 0.33333) + CU2S_GAMMA (x(S) 0.34555)
CuS-92Sun-newS.tdb	371.95	CU2S_ALPHA (x(S) 0.33333) + CU31S16 (x(S) 0.3413) + CU2S_GAMMA (x(S) 0.34634)
CuS-92Sun-newS.tdb	325.41	CU31S16 (x(S) 0.3413) + CU2S_GAMMA (x(S) 0.35752) + CUS_B18 (x(S) 0.5)
CuS-92Sun-newS.tdb	311.97	CU31S16 (x(S) 0.3413) + CU7S4 (x(S) 0.36364) + CUS_B18 (x(S) 0.5)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CuS-92Sun-LB · CALPHAD hull CuS-92Sun-newS

Invariant reactions (literature)

Invariant reactions reported in the literature for the Cu–S system (19)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1409.15	L2 = L1 + Dg	L2: S 0.3314; L1: S 0.022; Dg: S 0.333	model	[1] Lee 2007	Table 2, p. 4, row 2 report
1378.15	L2 = L1 + Dg		experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 24 report
1342.15	L1 = (Cu) + Dg	L1: S 0.0141; (Cu): S 2.000e-4; Dg: S 0.3331	model	[1] Lee 2007	Table 2, p. 4, row 4 report
1340.15	L1 = (Cu) + Dg		experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 25 report
1087.15	L2 = Dg + L3	L2: S 0.4012; Dg: S 0.3642; L3: S 0.9986	model	[1] Lee 2007	Table 2, p. 4, row 17 report
1086.15	L2 = Dg + L3		experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 32 report
781.15	Dg + L3 = Cv	Dg: S 0.3689; L3: S 0.9999	model	[1] Lee 2007	Table 2, p. 4, row 19 report
780.15	Dg + L3 = Cv		experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 33 report
388.15	L + Cv = (S)		experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 34 report
388.15	L + Cv = (S)		model	[1] Lee 2007	Table 2, p. 4, row 20 report
379.15	(Cu) + βCh = αCh		model	[1] Lee 2007	Table 2, p. 4, row 8 report
377.15	(Cu) + βCh = αCh		experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 27 report
367.15	βCh – Dg Dj	αCh: S 0.3333; Dg: S 0.3529; Dj: S 0.3413	model	[1] Lee 2007	Table 2, p. 4, row 10 report
366.15	βCh + Dg = Dj		experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 28 report
363.15	βCh = αCh + Dj		experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 29 report
350.15	Dg + Cv = An	Dg: S 0.3591	model	[1] Lee 2007	Table 2, p. 4, row 23 report
348.15	Dg + Cv = An		experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 35 report
345.15	Dg + Dj = An		experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 30 report
343.15	Dg + Dj = An	Dg: S 0.3561; Dj: S 0.3413	model	[1] Lee 2007	Table 2, p. 4, row 13 report

Other properties

Phase transition (4)

Phase transition, Cu–S system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	708.15 K	708.15	(Cu) + Dg = βCh	experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 26 report
Phase transition	708.15 K	708.15	(Cu) + Dg = βCh Dg: S 0.3334	model	[1] Lee 2007	Table 2, p. 4, row 5 report
Phase transition	1403.15 K	1403.15	L = Dg	experimental	[1] Lee 2007 cites Chakrabarti 1994	Table 2, p. 4, row 31 report
Phase transition	1413.15 K	1413.15	L = Dg L: S 0.3355	model	[1] Lee 2007	Table 2, p. 4, row 15 report

Sources

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

Byeong-Joo Lee, Bo Sundman, Sung Il Kim, Kwang-Geun Chin, Thermodynamic Calculations on the Stability of Cu2S in Low Carbon Steels, ISIJ Int. 47, 163-171 (2007). doi:10.2355/isijinternational.47.163

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}
}