Fe–Pt system

13 accepted literature values from 1 paper(s) (experimental 3, model 3, DFT 7); 2 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (5) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	3
model	3
DFT	7

Accepted values by property group
Property group	Values
formation	3
mixing / partial	3
crystal structure	7

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
FePt-01Fre-LB.tdb	P. Fredriksson, B. Sundman, Calphad, 25, 535-48(2001). doi:10.1016/S0364-5916(02)00006-8	`1c359cccce909a246dca46c144efa495605d129dad66335c49703cf2aab2c8d4`	viewer · TDB · JSON
FePt-01Fre-orig.tdb	P. Fredriksson, B. Sundman, Calphad, 25, 535-48(2001). doi:10.1016/S0364-5916(02)00006-8	`a5386a32fd8404bfa9128435ef3e1a89c7f59c90464595e13ff41f5382c7629b`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
FePt-01Fre-LB.tdb	1788.78	BCC_A2 (x(Pt) 0.02063) + FCC_4SL (x(Pt) 0.02598) + LIQUID (x(Pt) 0.03153)
FePt-01Fre-LB.tdb	1788.78	BCC_A2 (x(Pt) 0.02063) + FCC_A1 (x(Pt) 0.02598) + LIQUID (x(Pt) 0.03153)
FePt-01Fre-LB.tdb	1667.47	BCC_A2 (x(Pt) 0) + FCC_4SL (x(Pt) 0) + FCC_A1 (x(Pt) 0)
FePt-01Fre-LB.tdb	1184.81	BCC_A2 (x(Pt) 0) + FCC_A1 (x(Pt) 0) + FCC_4SL (x(Pt) 0)
FePt-01Fre-LB.tdb	821.64	BCC_A2 (x(Pt) 0.04262) + FCC_4SL#2 (x(Pt) 0.14372) + FCC_4SL (x(Pt) 0.21649)
FePt-01Fre-LB.tdb	821.64	BCC_A2 (x(Pt) 0.04262) + FCC_A1 (x(Pt) 0.14372) + FCC_4SL (x(Pt) 0.21649)
FePt-01Fre-orig.tdb	1799.54	BCC_A2 (x(Pt) 0.01047) + FCC_4SL (x(Pt) 0.01561) + LIQUID (x(Pt) 0.01621)
FePt-01Fre-orig.tdb	1799.54	BCC_A2 (x(Pt) 0.01047) + FCC_A1 (x(Pt) 0.01561) + LIQUID (x(Pt) 0.01621)
FePt-01Fre-orig.tdb	1184.81	BCC_A2 (x(Pt) 0) + FCC_4SL (x(Pt) 0) + FCC_A1 (x(Pt) 0)
FePt-01Fre-orig.tdb	1070.32	FCC_4SL (x(Pt) 0.33006) + FCC_A1 (x(Pt) 0.3387) + FCC_4SL#2 (x(Pt) 0.37733)
FePt-01Fre-orig.tdb	801.75	BCC_A2 (x(Pt) 0.03743) + FCC_4SL#2 (x(Pt) 0.14017) + FCC_4SL (x(Pt) 0.21358)
FePt-01Fre-orig.tdb	801.75	BCC_A2 (x(Pt) 0.03743) + FCC_A1 (x(Pt) 0.14017) + FCC_4SL (x(Pt) 0.21358)
FePt-01Fre-orig.tdb	801.75	BCC_A2 (x(Pt) 0.03743) + FCC_4SL (x(Pt) 0.14017) + FCC_4SL#2 (x(Pt) 0.21358)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull FePt-01Fre-orig

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, Fe–Pt system (3)
Phase	Value	Class	Source	Location
Fe3Pt	-19.361 kJ/mol-atom	DFT	[1] Kim 2011	Table 3, p. 3, row 8 report
FePt	-30.924 kJ/mol-atom	DFT	[1] Kim 2011	Table 3, p. 3, row 8 report
FePt3	-23.233 kJ/mol-atom	DFT	[1] Kim 2011	Table 3, p. 3, row 8 report

Other properties

Mixing / partial (3)

Mixing / partial, Fe–Pt system
Property	Value	Phases / composition	Class	Source	Location
Enthalpy of mixing printed: ΔHmix	-44.25 kJ/mol-atom	Fe3Pt alloy: Pt 0.25	model	[1] Kim 2011 cites Fredriksson 2001 doi	Table 3, p. 3, row 9 report
Enthalpy of mixing printed: ΔHmix	-65.25 kJ/mol-atom	FePt alloy: Pt 0.5	model	[1] Kim 2011 cites Fredriksson 2001 doi	Table 3, p. 3, row 9 report
Enthalpy of mixing printed: ΔHmix	-48.938 kJ/mol-atom	FePt3 alloy: Pt 0.75	model	[1] Kim 2011 cites Fredriksson 2001 doi	Table 3, p. 3, row 9 report

Crystal structure (7)

Crystal structure, Fe–Pt system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a printed: a	3.73 Å		Fe3Pt alloy: Pt 0.25	experimental	[1] Kim 2011 cites Leroux 1988	Table 3, p. 3, row 2 report
Lattice a printed: a	3.737 Å	0	Fe3Pt alloy: Pt 0.25	DFT	[1] Kim 2011	Table 3, p. 3, row 1 report
Lattice a printed: a	3.861 Å		FePt alloy: Pt 0.5	experimental	[1] Kim 2011 cites Leroux 1988	Table 3, p. 3, row 2 report
Lattice a printed: a	3.855 Å	0	FePt alloy: Pt 0.5	DFT	[1] Kim 2011	Table 3, p. 3, row 1 report
Lattice a printed: a	3.911 Å	0	FePt3 alloy: Pt 0.75	DFT	[1] Kim 2011	Table 3, p. 3, row 1 report
Lattice c printed: c	3.788 Å		FePt alloy: Pt 0.5	experimental	[1] Kim 2011 cites Galanakis 2000 doi	Table 3, p. 3, row 4 report
Lattice c printed: c	3.757 Å	0	FePt alloy: Pt 0.5	DFT	[1] Kim 2011	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).

DongEung Kim, James E. Saal, Liangcai Zhou, ShunLi Shang, Yong Du, Zi-Kui Liu, Thermodynamic modeling of fcc order/disorder transformations in the Co–Pt system, Calphad 35, 323-330 (2011). doi:10.1016/j.calphad.2011.04.005

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}
}