Co–Pr system

38 accepted literature values from 1 paper(s) (experimental 26, model 12); 1 calculated phase diagram(s). 4 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	26
model	12

Accepted values by property group
Property group	Values
invariant reaction	29
phase transition	9

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
CoPr-99Du.tdb	Z. Du, D. Wang, W. Zhang, J. Alloys Compd., 284, 206-12(1999). doi:10.1016/S0925-8388(98)00928-1	`2191eecdf8154a45cdc20b2f7cd3f0d167c96996e1adb2cd4d694f4fdb5a1859`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CoPr-99Du.tdb	1538.17	FCC_A1 (x(Pr) 1.000e-5) + CO17PR2 (x(Pr) 0.10526) + LIQUID (x(Pr) 0.12049)
CoPr-99Du.tdb	1538.17	FCC_A1 (x(Pr) 1.000e-5) + CO17PR2 (x(Pr) 0.10526) + LIQUID (x(Pr) 0.12043)
CoPr-99Du.tdb	1538.17	FCC_A1 (x(Pr) 1.000e-5) + CO17PR2 (x(Pr) 0.10526) + LIQUID (x(Pr) 0.12039)
CoPr-99Du.tdb	1504.72	CO17PR2 (x(Pr) 0.10526) + CO5PR_D2D (x(Pr) 0.16667) + LIQUID (x(Pr) 0.16786)
CoPr-99Du.tdb	1504.72	CO17PR2 (x(Pr) 0.10526) + CO5PR_D2D (x(Pr) 0.16667) + LIQUID (x(Pr) 0.16775)
CoPr-99Du.tdb	1504.72	CO17PR2 (x(Pr) 0.10526) + CO5PR_D2D (x(Pr) 0.16667) + LIQUID (x(Pr) 0.1675)
CoPr-99Du.tdb	1399.79	CO5PR_D2D (x(Pr) 0.16667) + CO19PR5 (x(Pr) 0.20833) + LIQUID (x(Pr) 0.28777)
CoPr-99Du.tdb	1399.79	CO5PR_D2D (x(Pr) 0.16667) + CO19PR5 (x(Pr) 0.20833) + LIQUID (x(Pr) 0.28814)
CoPr-99Du.tdb	1399.79	CO5PR_D2D (x(Pr) 0.16667) + CO19PR5 (x(Pr) 0.20833) + LIQUID (x(Pr) 0.28804)
CoPr-99Du.tdb	1391.34	CO19PR5 (x(Pr) 0.20833) + CO7PR2 (x(Pr) 0.22222) + LIQUID (x(Pr) 0.2978)
CoPr-99Du.tdb	1391.34	CO19PR5 (x(Pr) 0.20833) + CO7PR2 (x(Pr) 0.22222) + LIQUID (x(Pr) 0.29803)
CoPr-99Du.tdb	1391.34	CO19PR5 (x(Pr) 0.20833) + CO7PR2 (x(Pr) 0.22222) + LIQUID (x(Pr) 0.29773)
CoPr-99Du.tdb	1338.03	CO7PR2 (x(Pr) 0.22222) + CO3PR (x(Pr) 0.25) + LIQUID (x(Pr) 0.34918)
CoPr-99Du.tdb	1338.03	CO7PR2 (x(Pr) 0.22222) + CO3PR (x(Pr) 0.25) + LIQUID (x(Pr) 0.34891)
CoPr-99Du.tdb	1338.03	CO7PR2 (x(Pr) 0.22222) + CO3PR (x(Pr) 0.25) + LIQUID (x(Pr) 0.34914)
CoPr-99Du.tdb	1210.04	CO3PR (x(Pr) 0.25) + CO2PR_C15 (x(Pr) 0.33333) + LIQUID (x(Pr) 0.43532)
CoPr-99Du.tdb	1210.04	CO3PR (x(Pr) 0.25) + CO2PR_C15 (x(Pr) 0.33333) + LIQUID (x(Pr) 0.4355)
CoPr-99Du.tdb	1210.04	CO3PR (x(Pr) 0.25) + CO2PR_C15 (x(Pr) 0.33333) + LIQUID (x(Pr) 0.43561)
CoPr-99Du.tdb	1158.52	FCC_A1 (x(Pr) 0) + CO17PR2 (x(Pr) 0.10526) + CO5PR_D2D (x(Pr) 0.16667)
CoPr-99Du.tdb	1135.38	FCC_A1 (x(Pr) 0) + CO5PR_D2D (x(Pr) 0.16667) + CO19PR5 (x(Pr) 0.20833)
CoPr-99Du.tdb	1068	LIQUID (x(Pr) 0.92616) + BCC_A2 (x(Pr) 1) + DHCP (x(Pr) 1)
CoPr-99Du.tdb	1068	LIQUID (x(Pr) 0.92654) + DHCP (x(Pr) 1) + BCC_A2 (x(Pr) 1)
CoPr-99Du.tdb	861.23	CO2PR_C15 (x(Pr) 0.33333) + CO3PR4 (x(Pr) 0.57143) + LIQUID (x(Pr) 0.59536)
CoPr-99Du.tdb	861.23	CO2PR_C15 (x(Pr) 0.33333) + CO3PR4 (x(Pr) 0.57143) + LIQUID (x(Pr) 0.5951)
CoPr-99Du.tdb	861.23	CO2PR_C15 (x(Pr) 0.33333) + CO3PR4 (x(Pr) 0.57143) + LIQUID (x(Pr) 0.59542)
CoPr-99Du.tdb	842.07	COPR3_D011 (x(Pr) 0.75) + LIQUID (x(Pr) 0.78906) + DHCP (x(Pr) 1)
CoPr-99Du.tdb	842.07	COPR3_D011 (x(Pr) 0.75) + LIQUID (x(Pr) 0.78949) + DHCP (x(Pr) 1)
CoPr-99Du.tdb	842.07	COPR3_D011 (x(Pr) 0.75) + LIQUID (x(Pr) 0.78949) + DHCP (x(Pr) 1)
CoPr-99Du.tdb	842.06	COPR3_D011 (x(Pr) 0.75) + LIQUID (x(Pr) 0.7892) + DHCP (x(Pr) 1)
CoPr-99Du.tdb	816.95	LIQUID (x(Pr) 0.67765) + CO2PR5 (x(Pr) 0.71429) + COPR3_D011 (x(Pr) 0.75)
CoPr-99Du.tdb	816.95	LIQUID (x(Pr) 0.67796) + CO2PR5 (x(Pr) 0.71429) + COPR3_D011 (x(Pr) 0.75)
CoPr-99Du.tdb	806.11	CO3PR4 (x(Pr) 0.57143) + LIQUID (x(Pr) 0.66074) + CO2PR5 (x(Pr) 0.71429)
CoPr-99Du.tdb	806.11	CO3PR4 (x(Pr) 0.57143) + LIQUID (x(Pr) 0.66096) + CO2PR5 (x(Pr) 0.71429)
CoPr-99Du.tdb	806.11	CO3PR4 (x(Pr) 0.57143) + LIQUID (x(Pr) 0.66057) + CO2PR5 (x(Pr) 0.71429)
CoPr-99Du.tdb	694.99	FCC_A1 (x(Pr) 0) + HCP_A3 (x(Pr) 0) + CO19PR5 (x(Pr) 0.20833)
CoPr-99Du.tdb	312.39	CO7PR2 (x(Pr) 0.22222) + CO3PR (x(Pr) 0.25) + CO2PR_C15 (x(Pr) 0.33333)
CoPr-99Du.tdb	303.76	CO7PR2 (x(Pr) 0.22222) + CO3PR (x(Pr) 0.25) + CO2PR_C15 (x(Pr) 0.33333)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Co–Pr system (29)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1544	liq. + fcc(Co) -> Co17Pr2	liq.: Pr 0.145; Co17Pr2: Pr 0.105263	experimental	[1] Du 1999 cites Ray 1973	Table 6, p. 6, row 2 report
1541	liq. + fcc(Co) -> Co17Pr2	liq.: Pr 0.1059; Co17Pr2: Pr 0.105263	model	[1] Du 1999	Table 6, p. 6, row 1 report
1505	liq. + Co17Pr2 -> Co5Pr	liq.: Pr 0.1677; Co17Pr2: Pr 0.105263; Co5Pr: Pr 0.166667	model	[1] Du 1999	Table 6, p. 6, row 3 report
1504	liq. + Co17Pr2 -> Co5Pr	liq.: Pr 0.221; Co17Pr2: Pr 0.105263; Co5Pr: Pr 0.166667	experimental	[1] Du 1999 cites Wu 1992	Table 6, p. 6, row 5 report
1502	liq. + Co17Pr2 -> Co5Pr	liq.: Pr 0.17; Co17Pr2: Pr 0.105263; Co5Pr: Pr 0.166667	experimental	[1] Du 1999 cites Ray 1973	Table 6, p. 6, row 4 report
1403	liq. + Co5Pr -> Co19Pr5	liq.: Pr 0.295; Co5Pr: Pr 0.166667; Co19Pr5: Pr 0.208333	experimental	[1] Du 1999 cites Wu 1992	Table 6, p. 6, row 8 report
1400	liq. + Co5Pr -> Co19Pr5	liq.: Pr 0.2881; Co5Pr: Pr 0.166667; Co19Pr5: Pr 0.208333	model	[1] Du 1999	Table 6, p. 6, row 6 report
1398	liq. + Co5Pr -> Co19Pr5	liq.: Pr 0.305; Co5Pr: Pr 0.166667; Co19Pr5: Pr 0.208333	experimental	[1] Du 1999 cites Ray 1973	Table 6, p. 6, row 7 report
1393	liq. + Co19Pr5 -> Co7Pr2	liq.: Pr 0.31; Co19Pr5: Pr 0.208333; Co7Pr2: Pr 0.222222	experimental	[1] Du 1999 cites Wu 1992	Table 6, p. 6, row 14 report
1391	liq. + Co19Pr5 -> Co7Pr2	liq.: Pr 0.2978; Co19Pr5: Pr 0.208333; Co7Pr2: Pr 0.222222	model	[1] Du 1999	Table 6, p. 6, row 12 report
1391	liq. + Co19Pr5 -> Co7Pr2	liq.: Pr 0.31; Co19Pr5: Pr 0.208333; Co7Pr2: Pr 0.222222	experimental	[1] Du 1999 cites Ray 1973	Table 6, p. 6, row 13 report
1338	liq. + Co7Pr2 -> Co3Pr	liq.: Pr 0.3492; Co7Pr2: Pr 0.222222; Co3Pr: Pr 0.25	model	[1] Du 1999	Table 6, p. 6, row 15 report
1338	liq. + Co7Pr2 -> Co3Pr	liq.: Pr 0.345; Co7Pr2: Pr 0.222222; Co3Pr: Pr 0.25	experimental	[1] Du 1999 cites Wu 1992	Table 6, p. 6, row 17 report
1330	liq. + Co7Pr2 -> Co3Pr	liq.: Pr 0.34; Co7Pr2: Pr 0.222222; Co3Pr: Pr 0.25	experimental	[1] Du 1999 cites Ray 1973	Table 6, p. 6, row 16 report
1211	liq. + Co3Pr -> Co2Pr	liq.: Pr 0.44; Co3Pr: Pr 0.25; Co2Pr: Pr 0.333333	experimental	[1] Du 1999 cites Wu 1992	Table 6, p. 6, row 20 report
1210	liq. + Co3Pr -> Co2Pr	liq.: Pr 0.4355; Co3Pr: Pr 0.25; Co2Pr: Pr 0.333333	model	[1] Du 1999	Table 6, p. 6, row 18 report
1204	liq. + Co3Pr -> Co2Pr	liq.: Pr 0.44; Co3Pr: Pr 0.25; Co2Pr: Pr 0.333333	experimental	[1] Du 1999 cites Ray 1973	Table 6, p. 6, row 19 report
1127	Co5Pr -> Co17Pr2 + Co19Pr5	Co5Pr: Pr 0.166667; Co17Pr2: Pr 0.105263; Co19Pr5: Pr 0.208333	model	[1] Du 1999	Table 6, p. 6, row 9 report
871	liq. + Co2Pr -> Co3Pr4	liq.: Pr 0.6; Co2Pr: Pr 0.333333; Co3Pr4: Pr 0.571429	experimental	[1] Du 1999 cites Ray 1973	Table 6, p. 6, row 22 report
861	liq. + Co2Pr -> Co3Pr4	liq.: Pr 0.595; Co2Pr: Pr 0.333333; Co3Pr4: Pr 0.571429	model	[1] Du 1999	Table 6, p. 6, row 21 report
861	liq. + Co2Pr -> Co3Pr4	liq.: Pr 0.595; Co2Pr: Pr 0.333333; Co3Pr4: Pr 0.571429	experimental	[1] Du 1999 cites Wu 1992	Table 6, p. 6, row 23 report
843	eutectic: liq. -> CoPr3 + dhcp(Pr)	liq.: Pr 0.805; CoPr3: Pr 0.75	experimental	[1] Du 1999 cites Ray 1973	Table 6, p. 6, row 33 report
843	eutectic: liq. -> CoPr3 + dhcp(Pr)	liq.: Pr 0.805; CoPr3: Pr 0.75	experimental	[1] Du 1999 cites Wu 1992	Table 6, p. 6, row 34 report
842	eutectic: liq. -> CoPr3 + dhcp(Pr)	liq.: Pr 0.789; CoPr3: Pr 0.75	model	[1] Du 1999	Table 6, p. 6, row 32 report
831	liq. + CoPr3 -> Co2Pr5	liq.: Pr 0.68; CoPr3: Pr 0.75; Co2Pr5: Pr 0.714286	experimental	[1] Du 1999 cites Ray 1973	Table 6, p. 6, row 28 report
817	liq. + CoPr3 -> Co2Pr5	liq.: Pr 0.6776; CoPr3: Pr 0.75; Co2Pr5: Pr 0.714286	model	[1] Du 1999	Table 6, p. 6, row 27 report
814	eutectic: liq. -> Co3Pr4 + Co2Pr5	liq.: Pr 0.66; Co3Pr4: Pr 0.571429; Co2Pr5: Pr 0.714286	experimental	[1] Du 1999 cites Ray 1973	Table 6, p. 6, row 25 report
806	eutectic: liq. -> Co3Pr4 + Co2Pr5	liq.: Pr 0.66; Co3Pr4: Pr 0.571429; Co2Pr5: Pr 0.714286	experimental	[1] Du 1999 cites Wu 1992	Table 6, p. 6, row 26 report
806	eutectic: liq. -> Co3Pr4 + Co2Pr5	liq.: Pr 0.6607; Co3Pr4: Pr 0.571429; Co2Pr5: Pr 0.714286	model	[1] Du 1999	Table 6, p. 6, row 24 report

Other properties

Phase transition (9)

Phase transition, Co–Pr system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	49 K	49	magnetic: Co2Pr alloy: Pr 0.333333	experimental	[1] Du 1999 cites Buschow 1977 doi	Table 1, p. 2, row 6 report
Phase transition	339 K	339	magnetic: Co3Pr alloy: Pr 0.25	experimental	[1] Du 1999 cites Buschow 1977 doi	Table 1, p. 2, row 5 report
Phase transition	574 K	574	magnetic: Co7Pr2 alloy: Pr 0.222222	experimental	[1] Du 1999 cites Buschow 1977 doi	Table 1, p. 2, row 4 report
Phase transition	690 K	690	magnetic: Co19Pr5 alloy: Pr 0.208333	experimental	[1] Du 1999 cites Buschow 1977 doi	Table 1, p. 2, row 3 report
Phase transition	852 K	852	liq. -> CoPr3 liq.: Pr 0.75; CoPr3: Pr 0.75	model	[1] Du 1999	Table 6, p. 6, row 29 report
Phase transition	852 K	852	liq. -> CoPr3 liq.: Pr 0.75; CoPr3: Pr 0.75	experimental	[1] Du 1999 cites Wu 1992	Table 6, p. 6, row 31 report
Phase transition	863 K	863	liq. -> CoPr3 liq.: Pr 0.75; CoPr3: Pr 0.75	experimental	[1] Du 1999 cites Ray 1973	Table 6, p. 6, row 30 report
Phase transition	912 K	912	magnetic: Co5Pr alloy: Pr 0.166667	experimental	[1] Du 1999 cites Buschow 1977 doi	Table 1, p. 2, row 2 report
Phase transition	1177 K	1177	magnetic: Co17Pr2 alloy: Pr 0.105263	experimental	[1] Du 1999 cites Buschow 1977 doi	Table 1, p. 2, row 1 report

Sources

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

Zhenmin Du, Donghui Wang, Weijing Zhang, Thermodynamic assessment of the Co–Pr, Er–Ni and Ni–Pr systems, Journal of Alloys and Compounds 284, 206-212 (1999). doi:10.1016/s0925-8388(98)00928-1

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}
}