Co–Er system

24 accepted literature values from 1 paper(s) (experimental 12, model 12); 1 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 (11) · papers (bibliography) · Markdown

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

Accepted values by property group
Property group	Values
invariant reaction	18
phase transition	6

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
CoEr-09Wan.tdb	C.P. Wang, A.Q. Zheng, X.J. Liu, K. Ishida, J. Alloys Compd., 478, 197-201(2009). doi:10.1016/j.jallcom.2008.11.110	`36ee4428d18320d82e2c24ff0a852ca2d574358d68152ceaa7b048dd114b2e11`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CoEr-09Wan.tdb	1625.17	LIQUID (x(Er) 0.18373) + CO7ER2 (x(Er) 0.22222) + CO3ER (x(Er) 0.25)
CoEr-09Wan.tdb	1625.17	LIQUID (x(Er) 0.18362) + CO7ER2 (x(Er) 0.22222) + CO3ER (x(Er) 0.25)
CoEr-09Wan.tdb	1625.17	LIQUID (x(Er) 0.18394) + CO7ER2 (x(Er) 0.22222) + CO3ER (x(Er) 0.25)
CoEr-09Wan.tdb	1619.81	FCC_A1 (x(Er) 1.000e-4) + LIQUID (x(Er) 0.0653) + CO17ER2 (x(Er) 0.10526)
CoEr-09Wan.tdb	1619.81	FCC_A1 (x(Er) 1.000e-4) + LIQUID (x(Er) 0.06521) + CO17ER2 (x(Er) 0.10526)
CoEr-09Wan.tdb	1611.02	CO3ER (x(Er) 0.25) + LIQUID (x(Er) 0.3331) + CO2ER_C15 (x(Er) 0.33333)
CoEr-09Wan.tdb	1611.02	CO3ER (x(Er) 0.25) + LIQUID (x(Er) 0.33289) + CO2ER_C15 (x(Er) 0.33333)
CoEr-09Wan.tdb	1609.69	CO5ER_D2D (x(Er) 0.16667) + LIQUID (x(Er) 0.16795) + CO7ER2 (x(Er) 0.22222)
CoEr-09Wan.tdb	1609.69	CO5ER_D2D (x(Er) 0.16667) + LIQUID (x(Er) 0.1682) + CO7ER2 (x(Er) 0.22222)
CoEr-09Wan.tdb	1609.69	CO5ER_D2D (x(Er) 0.16667) + LIQUID (x(Er) 0.16838) + CO7ER2 (x(Er) 0.22222)
CoEr-09Wan.tdb	1609.13	CO17ER2 (x(Er) 0.10526) + LIQUID (x(Er) 0.1597) + CO5ER_D2D (x(Er) 0.16667)
CoEr-09Wan.tdb	1511.76	CO17ER2 (x(Er) 0.10526) + CO5ER_D2D (x(Er) 0.16667) + CO7ER2 (x(Er) 0.22222)
CoEr-09Wan.tdb	1183.93	LIQUID (x(Er) 0.74054) + COER3_D011 (x(Er) 0.75) + HCP_A3 (x(Er) 0.99879)
CoEr-09Wan.tdb	1183.93	LIQUID (x(Er) 0.74058) + COER3_D011 (x(Er) 0.75) + HCP_A3 (x(Er) 0.99879)
CoEr-09Wan.tdb	1087.55	CO7ER12 (x(Er) 0.63158) + LIQUID (x(Er) 0.66089) + COER3_D011 (x(Er) 0.75)
CoEr-09Wan.tdb	1087.55	CO7ER12 (x(Er) 0.63158) + LIQUID (x(Er) 0.66087) + COER3_D011 (x(Er) 0.75)
CoEr-09Wan.tdb	1087.55	CO7ER12 (x(Er) 0.63158) + LIQUID (x(Er) 0.66112) + COER3_D011 (x(Er) 0.75)
CoEr-09Wan.tdb	1074.22	CO2ER_C15 (x(Er) 0.33333) + LIQUID (x(Er) 0.58516) + CO7ER12 (x(Er) 0.63158)
CoEr-09Wan.tdb	1074.21	CO2ER_C15 (x(Er) 0.33333) + LIQUID (x(Er) 0.58511) + CO7ER12 (x(Er) 0.63158)
CoEr-09Wan.tdb	694.99	FCC_A1 (x(Er) 0) + HCP_A3 (x(Er) 0) + CO17ER2 (x(Er) 0.10526)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Co–Er system (18)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1629.15	peritectic: L + Co3Er -> Co7Er2	Co3Er: Er 0.25; Co7Er2: Er 0.222	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 12 report
1625.15	peritectic: L + Co3Er -> Co7Er2	L: Er 0.184; Co3Er: Er 0.25; Co7Er2: Er 0.222	model	[1] Wang 2009	Table 4, p. 4, row 11 report
1620.15	peritectic: L + Co3Er -> Co2Er	Co3Er: Er 0.25; Co2Er: Er 0.333	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 16 report
1620.15	eutectic: L -> (αCo) + Co17Er2	L: Er 0.065; (αCo): Er 0; Co17Er2: Er 0.105	model	[1] Wang 2009	Table 4, p. 4, row 1 report
1613.15	peritectic: L + Co7Er2 -> Co5Er	Co7Er2: Er 0.222; Co5Er: Er 0.167	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 8 report
1612.15	eutectic: L -> (αCo) + Co17Er2	L: Er 0.077; (αCo): Er 0; Co17Er2: Er 0.105	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 2 report
1611.15	peritectic: L + Co3Er -> Co2Er	L: Er 0.333; Co3Er: Er 0.25; Co2Er: Er 0.333	model	[1] Wang 2009	Table 4, p. 4, row 15 report
1610.15	peritectic: L + Co7Er2 -> Co5Er	L: Er 0.167; Co7Er2: Er 0.222; Co5Er: Er 0.167	model	[1] Wang 2009	Table 4, p. 4, row 7 report
1609.15	eutectic: L -> Co17Er2 + Co5Er	L: Er 0.16; Co17Er2: Er 0.105; Co5Er: Er 0.167	model	[1] Wang 2009	Table 4, p. 4, row 5 report
1603.15	eutectic: L -> Co17Er2 + Co5Er	L: Er 0.135; Co17Er2: Er 0.105; Co5Er: Er 0.167	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 6 report
1513.15	eutectoid: Co5Er -> Co17Er2 + Co7Er2	Co5Er: Er 0.167; Co17Er2: Er 0.105; Co7Er2: Er 0.222	model	[1] Wang 2009	Table 4, p. 4, row 9 report
1513.15	eutectoid: Co5Er -> Co17Er2 + Co7Er2	Co5Er: Er 0.167; Co17Er2: Er 0.105; Co7Er2: Er 0.222	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 10 report
1185.15	peritectic: L + (Er) -> CoEr3	(Er): Er 1; CoEr3: Er 0.75	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 24 report
1184.15	peritectic: L + (Er) -> CoEr3	L: Er 0.74; (Er): Er 1; CoEr3: Er 0.75	model	[1] Wang 2009	Table 4, p. 4, row 23 report
1087.15	eutectic: L -> Co3Er + Co7Er12	L: Er 0.66; Co3Er: Er 0.75; Co7Er12: Er 0.632	model	[1] Wang 2009	Table 4, p. 4, row 21 report
1078.15	eutectic: L -> Co3Er + Co7Er12	L: Er 0.675; Co3Er: Er 0.75; Co7Er12: Er 0.64	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 22 report
1074.15	eutectic: L -> Co2Er + Co7Er12	L: Er 0.585; Co2Er: Er 0.333; Co7Er12: Er 0.632	model	[1] Wang 2009	Table 4, p. 4, row 17 report
1068.15	eutectic: L -> Co2Er + Co7Er12	L: Er 0.5625; Co2Er: Er 0.333; Co7Er12: Er 0.64	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 18 report

Other properties

Phase transition (6)

Phase transition, Co–Er system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	1096.15 K	1096.15	congruent melting: L -> Co7Er12 L: Er 0.632; Co7Er12: Er 0.632	model	[1] Wang 2009	Table 4, p. 4, row 19 report
Phase transition	1098.15 K	1098.15	congruent melting: L -> Co7Er12 L: Er 0.64; Co7Er12: Er 0.64	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 20 report
Phase transition	1645.15 K	1645.15	congruent melting: L -> Co17Er2 L: Er 0.105; Co17Er2: Er 0.105	model	[1] Wang 2009	Table 4, p. 4, row 3 report
Phase transition	1668.15 K	1668.15	congruent melting: L -> Co3Er L: Er 0.25; Co3Er: Er 0.25	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 14 report
Phase transition	1670.15 K	1670.15	congruent melting: L -> Co3Er L: Er 0.25; Co3Er: Er 0.25	model	[1] Wang 2009	Table 4, p. 4, row 13 report
Phase transition	1715.15 K	1715.15	congruent melting: L -> Co17Er2 L: Er 0.105; Co17Er2: Er 0.105	experimental	[1] Wang 2009 cites Wu 1993	Table 4, p. 4, row 4 report

Sources

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

C.P. Wang, A.Q. Zheng, X.J. Liu, K. Ishida, Thermodynamic assessments of the Co–Er and V–Er systems, Journal of Alloys and Compounds 478, 197-201 (2009). doi:10.1016/j.jallcom.2008.11.110

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}
}