Cu–Eu system

12 accepted literature values from 1 paper(s) (experimental 6, model 6); 1 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (8) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	6
model	6

Accepted values by property group
Property group	Values
invariant reaction	10
phase transition	2

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
CuEu-07Zha.tdb	L.G. Zhang, L.B. Liu, H.S. Liu, Z.P. Jin, Calphad, 31, 264-68(2007). doi:10.1016/j.calphad.2006.11.003	`4a0bb1c43d7e14de082713c60ceeb37c0a69657a3a8e6833e4233516a9e4ccc6`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CuEu-07Zha.tdb	1107.52	FCC_A1 (x(Eu) 0) + LIQUID (x(Eu) 0.13513) + CU5EU_D2D (x(Eu) 0.16667)
CuEu-07Zha.tdb	1107.52	FCC_A1 (x(Eu) 0) + LIQUID (x(Eu) 0.13507) + CU5EU_D2D (x(Eu) 0.16667)
CuEu-07Zha.tdb	1107.52	FCC_A1 (x(Eu) 0) + LIQUID (x(Eu) 0.13496) + CU5EU_D2D (x(Eu) 0.16667)
CuEu-07Zha.tdb	1094.99	FCC_A1 (x(Eu) 0) + BCC_A2 (x(Eu) 1) + LIQUID (x(Eu) 1)
CuEu-07Zha.tdb	865.88	CU5EU_D2D (x(Eu) 0.16667) + CU2EU (x(Eu) 0.33333) + LIQUID (x(Eu) 0.4605)
CuEu-07Zha.tdb	865.88	CU5EU_D2D (x(Eu) 0.16667) + CU2EU (x(Eu) 0.33333) + LIQUID (x(Eu) 0.46005)
CuEu-07Zha.tdb	801.33	CU2EU (x(Eu) 0.33333) + CUEU_B27 (x(Eu) 0.5) + LIQUID (x(Eu) 0.59053)
CuEu-07Zha.tdb	801.33	CU2EU (x(Eu) 0.33333) + CUEU_B27 (x(Eu) 0.5) + LIQUID (x(Eu) 0.59)
CuEu-07Zha.tdb	801.33	CU2EU (x(Eu) 0.33333) + CUEU_B27 (x(Eu) 0.5) + LIQUID (x(Eu) 0.59089)
CuEu-07Zha.tdb	727.82	CUEU_B27 (x(Eu) 0.5) + CUEU2 (x(Eu) 0.66667) + LIQUID (x(Eu) 0.74837)
CuEu-07Zha.tdb	727.82	CUEU_B27 (x(Eu) 0.5) + CUEU2 (x(Eu) 0.66667) + LIQUID (x(Eu) 0.74831)
CuEu-07Zha.tdb	727.82	CUEU_B27 (x(Eu) 0.5) + CUEU2 (x(Eu) 0.66667) + LIQUID (x(Eu) 0.74832)
CuEu-07Zha.tdb	727.82	CUEU_B27 (x(Eu) 0.5) + CUEU2 (x(Eu) 0.66667) + LIQUID (x(Eu) 0.74866)
CuEu-07Zha.tdb	727.82	CUEU_B27 (x(Eu) 0.5) + CUEU2 (x(Eu) 0.66667) + LIQUID (x(Eu) 0.74866)
CuEu-07Zha.tdb	724.22	CUEU2 (x(Eu) 0.66667) + LIQUID (x(Eu) 0.76074) + BCC_A2 (x(Eu) 0.99932)
CuEu-07Zha.tdb	724.22	CUEU2 (x(Eu) 0.66667) + LIQUID (x(Eu) 0.76085) + BCC_A2 (x(Eu) 0.99932)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Cu–Eu system (10)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1115	eutectic: L -> FCC(Cu) + Cu5Eu	L: Eu 0.13; Cu5Eu: Eu 0.166667	experimental	[1] Zhang 2007 cites Costa 1985 doi	Table 3, p. 3, row 2 report
1109	eutectic: L -> FCC(Cu) + Cu5Eu	L: Eu 0.1176; Cu5Eu: Eu 0.166667	model	[1] Zhang 2007	Table 3, p. 3, row 1 report
870	peritectic: L + Cu5Eu -> Cu2Eu	L: Eu 0.41; Cu5Eu: Eu 0.166667; Cu2Eu: Eu 0.333333	experimental	[1] Zhang 2007 cites Costa 1985 doi	Table 3, p. 3, row 6 report
869	peritectic: L + Cu5Eu -> Cu2Eu	L: Eu 0.4081; Cu5Eu: Eu 0.166667; Cu2Eu: Eu 0.333333	model	[1] Zhang 2007	Table 3, p. 3, row 5 report
810	peritectic: L + Cu2Eu -> CuEu	L: Eu 0.51; Cu2Eu: Eu 0.333333; CuEu: Eu 0.5	experimental	[1] Zhang 2007 cites Costa 1985 doi	Table 3, p. 3, row 8 report
802	peritectic: L + Cu2Eu -> CuEu	L: Eu 0.511; Cu2Eu: Eu 0.333333; CuEu: Eu 0.5	model	[1] Zhang 2007	Table 3, p. 3, row 7 report
720	peritectic: L + CuEu -> CuEu2	L: Eu 0.7351; CuEu: Eu 0.5; CuEu2: Eu 0.666667	model	[1] Zhang 2007	Table 3, p. 3, row 9 report
717	eutectic: L -> BCC(Eu) + CuEu2	L: Eu 0.7403; CuEu2: Eu 0.666667	model	[1] Zhang 2007	Table 3, p. 3, row 11 report
715	peritectic: L + CuEu -> CuEu2	L: Eu 0.733; CuEu: Eu 0.5; CuEu2: Eu 0.666667	experimental	[1] Zhang 2007 cites Costa 1985 doi	Table 3, p. 3, row 10 report
710	eutectic: L -> BCC(Eu) + CuEu2	L: Eu 0.74; CuEu2: Eu 0.666667	experimental	[1] Zhang 2007 cites Costa 1985 doi	Table 3, p. 3, row 12 report

Other properties

Phase transition (2)

Phase transition, Cu–Eu system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	1120 K	1120	congruent melting: L -> Cu5Eu L: Eu 0.1667; Cu5Eu: Eu 0.166667	experimental	[1] Zhang 2007 cites Costa 1985 doi	Table 3, p. 3, row 4 report
Phase transition	1122 K	1122	congruent melting: L -> Cu5Eu L: Eu 0.1667; Cu5Eu: Eu 0.166667	model	[1] Zhang 2007	Table 3, p. 3, row 3 report

Sources

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

L.G. Zhang, L.B. Liu, H.S. Liu, Z.P. Jin, Thermodynamic assessment of Cu–Eu and Cu–Yb system, Calphad 31, 264-268 (2007). doi:10.1016/j.calphad.2006.11.003

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}
}