Cu–Pr system

29 accepted literature values from 1 paper(s) (model 22, unspecified 7); 1 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (10) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
model	22
unspecified	7

Accepted values by property group
Property group	Values
invariant reaction	10
formation	19

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
CuPr-96Zhu.tdb	W. Zhuang, Z.-Y. Qiao, S. Wei, J. Shen, J. Phase Equilib., 17, 508-21(1996). doi:10.1007/BF02665998	`80386a76c9a9fa0e8e07a92263a0a221c83ee59718ec54cc2c7c7538a4fa70fb`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CuPr-96Zhu.tdb	1169.81	FCC_A1 (x(Pr) 0) + LIQUID (x(Pr) 0.0857) + CU6PR (x(Pr) 0.14286)
CuPr-96Zhu.tdb	1169.81	FCC_A1 (x(Pr) 0) + LIQUID (x(Pr) 0.08563) + CU6PR (x(Pr) 0.14286)
CuPr-96Zhu.tdb	1169.81	FCC_A1 (x(Pr) 0) + LIQUID (x(Pr) 0.08555) + CU6PR (x(Pr) 0.14286)
CuPr-96Zhu.tdb	1107.11	CU6PR (x(Pr) 0.14286) + CU5PR_D2D (x(Pr) 0.16667) + LIQUID (x(Pr) 0.24126)
CuPr-96Zhu.tdb	1107.1	CU6PR (x(Pr) 0.14286) + CU5PR_D2D (x(Pr) 0.16667) + LIQUID (x(Pr) 0.24148)
CuPr-96Zhu.tdb	1091.84	CU5PR_D2D (x(Pr) 0.16667) + CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.25073)
CuPr-96Zhu.tdb	1091.84	CU5PR_D2D (x(Pr) 0.16667) + CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.25067)
CuPr-96Zhu.tdb	1091.84	CU5PR_D2D (x(Pr) 0.16667) + CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.25091)
CuPr-96Zhu.tdb	1068.69	CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.26977) + CU2PR (x(Pr) 0.33333)
CuPr-96Zhu.tdb	1068.68	CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.27001) + CU2PR (x(Pr) 0.33333)
CuPr-96Zhu.tdb	1068.68	CU4PR (x(Pr) 0.2) + LIQUID (x(Pr) 0.27005) + CU2PR (x(Pr) 0.33333)
CuPr-96Zhu.tdb	1063.4	LIQUID (x(Pr) 0.90778) + BCC_A2 (x(Pr) 0.99845) + DHCP (x(Pr) 1)
CuPr-96Zhu.tdb	1063.4	LIQUID (x(Pr) 0.90787) + BCC_A2 (x(Pr) 0.99845) + DHCP (x(Pr) 1)
CuPr-96Zhu.tdb	564.75	CU2PR (x(Pr) 0.33333) + LIQUID (x(Pr) 0.65309) + DHCP (x(Pr) 1)
CuPr-96Zhu.tdb	564.75	CU2PR (x(Pr) 0.33333) + LIQUID (x(Pr) 0.65304) + DHCP (x(Pr) 1)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Cu–Pr system (10)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location	Quote
1218	congruent melting: liq -> Cu6Pr	L: Pr 0.143; Cu6Pr: Cu 0.857143, Pr 0.142857	model	[1] Zhuang 1996	Table 5, p. 7, row 2 report
1169	eutectic: liq -> Cu(fcc) + Cu6Pr	L: Pr 0.086; Cu6Pr: Cu 0.857143, Pr 0.142857	model	[1] Zhuang 1996	Table 5, p. 7, row 1 report
1104	peritectic: liq + Cu6Pr -> Cu5Pr	L: Pr 0.243; Cu6Pr: Cu 0.857143, Pr 0.142857; Cu5Pr: Cu 0.833333, Pr 0.166667	model	[1] Zhuang 1996	Table 5, p. 7, row 3 report
1104	congruent melting: liq -> Cu2Pr	L: Pr 0.333; Cu2Pr: Cu 0.666667, Pr 0.333333	model	[1] Zhuang 1996	Table 5, p. 7, row 6 report
1100	peritectic: liquid + Cu6Pr -> Cu5Pr		model	[1] Zhuang 1996	p. 4 report	According to the formation rule of the other CusR phases, CusPr is likely to form from Cu6Pr and liquid through a peritectic reaction at about 1100 K, which is determined by interpolation of the melting data of other CusR phases.
1093	peritectic: liq + Cu5Pr -> Cu4Pr	L: Pr 0.249; Cu5Pr: Cu 0.833333, Pr 0.166667; Cu4Pr: Cu 0.8, Pr 0.2	model	[1] Zhuang 1996	Table 5, p. 7, row 4 report
1069	eutectic: liq -> Cu4Pr + Cu2Pr	L: Pr 0.27; Cu4Pr: Cu 0.8, Pr 0.2; Cu2Pr: Cu 0.666667, Pr 0.333333	model	[1] Zhuang 1996	Table 5, p. 7, row 5 report
1068	metatectic/catatectic: Pr(bcc) -> liq + Pr(dcph)	L: Pr 0.912	model	[1] Zhuang 1996	Table 5, p. 7, row 9 report
855	peritectic: liq + Cu2Pr -> CuPr	L: Pr 0.53; Cu2Pr: Cu 0.666667, Pr 0.333333; CuPr: Cu 0.5, Pr 0.5	model	[1] Zhuang 1996	Table 5, p. 7, row 7 report
715	eutectic: liq -> CuPr + Pr(dcph)	L: Pr 0.698; CuPr: Cu 0.5, Pr 0.5	model	[1] Zhuang 1996	Table 5, p. 7, row 8 report

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, Cu–Pr system (19)
Phase	Value	Class	Source	Location
Cu2R	-43.6 kJ/mol (basis unstated)	unspecified	[1] Zhuang 1996 cites ref. 88Sub4	Table 10, p. 13, row 29 report
Cu2R	-31.5 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 30 report
Cu2R	-19.7 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 28 report
Cu2R	-14.5 kJ/mol (basis unstated)	unspecified	[1] Zhuang 1996 cites ref. 94Fit	Table 10, p. 13, row 31 report
Cu4R	-31.5 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 30 report
Cu4R	-27.8 kJ/mol (basis unstated)	unspecified	[1] Zhuang 1996 cites ref. 88Sub4	Table 10, p. 13, row 26 report
Cu4R	-22.2 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 27 report
Cu4R	-15.1 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 25 report
Cu5R	-30.7 kJ/mol (basis unstated)	unspecified	[1] Zhuang 1996 cites ref. 88Sub4	Table 10, p. 13, row 23 report
Cu5R	-18.8 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 24 report
Cu5R	-13.8 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 22 report
Cu6R	-33.6 kJ/mol (basis unstated)	unspecified	[1] Zhuang 1996 cites ref. 88Sub4	Table 10, p. 13, row 19 report
Cu6R	-16.1 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 20 report
Cu6R	-12.7 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 18 report
Cu6R	-11.3 kJ/mol (basis unstated)	unspecified	[1] Zhuang 1996 cites ref. 94Fit	Table 10, p. 13, row 21 report
CuR	-46.7 kJ/mol (basis unstated)	unspecified	[1] Zhuang 1996 cites ref. 88Sub4	Table 10, p. 13, row 33 report
CuR	-31 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 34 report
CuR	-19 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 32 report
CuR	-12.7 kJ/mol (basis unstated)	model	[1] Zhuang 1996	Table 10, p. 13, row 18 report

Sources

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

W. Zhuang, Z. -Y. Qiao, S. Wei, J. Shen, Thermodynamic evaluation of the Cu-R (R: Ce, Pr, Nd, Sm) binary systems, JPE 17, 508-521 (1996). doi:10.1007/bf02665998

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}
}