# Cr–Pt system > Cr–Pt system: 25 accepted literature values (invariant reaction 13, phase transition 11, phase equilibrium 1) and 3 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote. HTML: https://data.orchid-project.org/systems/CR-PT.html · Markdown: https://data.orchid-project.org/systems/CR-PT.md 25 accepted literature values from 2 paper(s) (experimental 17, model 7, unspecified 1); 3 calculated phase diagram(s). 3 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV. Data: [JSON](https://data.orchid-project.org/literature/systems/CR-PT.json) · [CSV](https://data.orchid-project.org/systems/CR-PT.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CR-PT) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CR-PT/CrPt-01Oik.json) · [phases (7)](https://data.orchid-project.org/phases/pages/CR-PT.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CR-PT.html) · [Markdown](https://data.orchid-project.org/systems/CR-PT.md) Table: Accepted values by evidence class | Evidence class | Values | |---|---:| | experimental | 17 | | model | 7 | | unspecified | 1 | Table: Accepted values by property group | Property group | Values | |---|---:| | invariant reaction | 13 | | phase transition | 11 | | phase equilibrium | 1 | ## 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. Table: Assessments with a calculated phase diagram | TDB file | Assessment | SHA-256 | Links | |---|---|---|---| | CrPt-01Oik.tdb | K. Oikawa, G.W. Qin, T. Ikeshoji, O. Kitakami, Y. Shimada, K. Ishida, K. Fukamichi, J. Magn. Magn. Mater., 236, 220-33(2001). [doi:10.1016/S0304-8853(00)00520-5](https://doi.org/10.1016/S0304-8853%2800%2900520-5) | `e67e8c07062774a02e8a14ba0e210e64a7c8c0af033bb5f77fa90997391970da` | [viewer](https://orchid-project.org/phase-diagrams/#CR-PT/CrPt-01Oik.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CrPt-01Oik.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CrPt-01Oik.json) | | CrPt-09Pre.tdb | J. Preussner, S. Prins, R. Voelkl, Z.-K. Liu, U. Glatzel, Mater. Sci. Eng. A, 510-511, 322-27(2009). [doi:10.1016/j.msea.2008.10.059](https://doi.org/10.1016/j.msea.2008.10.059) | `812667dfc13e00cf799010d354ae3852315ceb49ab355b9893bf0e80fd897b80` | [viewer](https://orchid-project.org/phase-diagrams/#CR-PT/CrPt-09Pre.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CrPt-09Pre.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CrPt-09Pre.json) | | CrPt-98Spe-LB.tdb | P.J. Spencer, unpublished, 1998. | `82886ea74acc67cb66c2d3759b268a45d685cdca93e526a139cfedfd875f1c03` | [viewer](https://orchid-project.org/phase-diagrams/#CR-PT/CrPt-98Spe-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CrPt-98Spe-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CrPt-98Spe-LB.json) | Table: Calculated three-phase invariants (model, mole fraction of the second component) | TDB file | T (K) | Phases at the invariant | |---|---:|---| | CrPt-01Oik.tdb | 1838.2 | BCC_A2 (x(Pt) 0.05832) + LIQUID (x(Pt) 0.14166) + CR3PT_A15 (x(Pt) 0.17133) | | CrPt-01Oik.tdb | 1821.34 | CR3PT_A15 (x(Pt) 0.20472) + LIQUID (x(Pt) 0.24906) + FCC_A1 (x(Pt) 0.28028) | | CrPt-09Pre.tdb | 1889.24 | BCC_A2 (x(Pt) 0.06917) + LIQUID (x(Pt) 0.13554) + CR3PT_A15 (x(Pt) 0.16482) | | CrPt-09Pre.tdb | 1831.73 | CR3PT_A15 (x(Pt) 0.19984) + LIQUID (x(Pt) 0.26826) + FCC_A1 (x(Pt) 0.29987) | | CrPt-09Pre.tdb | 1542.76 | CR3PT_A15 (x(Pt) 0.20775) + FCC_4SL (x(Pt) 0.32946) + FCC_A1 (x(Pt) 0.3296) | | CrPt-98Spe-LB.tdb | 1844.63 | CR3PT_A15 (x(Pt) 0.2) + LIQUID (x(Pt) 0.2487) + FCC_A1 (x(Pt) 0.28087) | | CrPt-98Spe-LB.tdb | 1842.68 | BCC_A2 (x(Pt) 0.0706) + LIQUID (x(Pt) 0.15111) + CR3PT_A15 (x(Pt) 0.2) | | CrPt-98Spe-LB.tdb | 1842.68 | BCC_A2 (x(Pt) 0.07053) + LIQUID (x(Pt) 0.15101) + CR3PT_A15 (x(Pt) 0.2) | | CrPt-98Spe-LB.tdb | 1044.21 | CR3PT_A15 (x(Pt) 0.2) + FCC_A1 (x(Pt) 0.34247) + CRPT3_L12 (x(Pt) 0.37793) | Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CR/CR-PT.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CR/CR-PT.json) · [CALPHAD hull CrPt-01Oik](https://data.orchid-project.org/hulls/calphad-sgte/CR/CR-PT--CrPt-01Oik.json) · [CALPHAD hull CrPt-98Spe-LB](https://data.orchid-project.org/hulls/calphad-sgte/CR/CR-PT--CrPt-98Spe-LB.json) ## Invariant reactions (literature) Table: Invariant reactions reported in the literature for the Cr–Pt system (13) | T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote | |---:|---|---|---|---|---|---| | 2058 | congruent melting: L ↔ Pt fcc | L: Pt 0.8; Pt fcc: Pt 0.8 | experimental | [1] Preußner 2009 | Table 3, p. 5, row 1; `ORC-V3PUGYAKUF` | | | 2053 | congruent melting: L ↔ Pt fcc | | model | [1] Preußner 2009 | Table 3, p. 5, row 2; `ORC-NGS3XJGQNC` | | | 1903 | congruent melting: L ↔ A15 Cr3Pt | L: Pt 0.18; A15 Cr3Pt: Pt 0.18 | model | [1] Preußner 2009 | Table 3, p. 5, row 4; `ORC-HU5QEJGYGD` | | | 1887 | eutectic: L ↔ Cr bcc + A15 Cr3Pt | A15: Pt 0.17 | model | [1] Preußner 2009 | Table 3, p. 5, row 8; `ORC-XNOHPC7WIQ` | | | 1873 | congruent melting: L ↔ A15 Cr3Pt | L: Pt 0.18; A15 Cr3Pt: Pt 0.18 | experimental | [1] Preußner 2009 | Table 3, p. 5, row 3; `ORC-42VNZ3RYM6` | | | 1830 | eutectic: L ↔ A15 Cr3Pt + Pt fcc | A15: Pt 0.2 | model | [1] Preußner 2009 | Table 3, p. 5, row 6; `ORC-THO2EB7PIM` | | | 1803 | eutectic: L ↔ A15 Cr3Pt + Pt fcc | L: Pt 0.24; A15: Pt 0.2; fcc: Pt 0.29 | experimental | [1] Preußner 2009 | Table 3, p. 5, row 5; `ORC-A4IGN5YKJE` | | | 1773 | eutectic: L ↔ Cr bcc + A15 Cr3Pt | L: Pt 0.13; bcc: Pt 0.1; A15: Pt 0.17 | experimental | [1] Preußner 2009 | Table 3, p. 5, row 7; `ORC-N7OPIZHVQA` | | | 1542 | order-disorder: Pt fcc ↔ L12 Cr3Pt + A15 | A15: Cr 0.75, Pt 0.25 | model | [1] Preußner 2009 | Table 3, p. 5, row 12; `ORC-H5ABX2D6OI` | | | 1440 | order-disorder: Pt fcc ↔ L10 CrPt | | model | [1] Preußner 2009 | Table 3, p. 5, row 9; `ORC-EO2BOI276S` | | | 1425 | order-disorder: Pt fcc ↔ L12 CrPt3 | | model | [1] Preußner 2009 | Table 3, p. 5, row 11; `ORC-KUZXIPZDWB` | | | 1403 | order-disorder: Pt fcc ↔ L12 CrPt3 | Pt fcc: Pt 0.67; L12 CrPt3: Pt 0.67 | experimental | [1] Preußner 2009 | Table 3, p. 5, row 10; `ORC-GUL5WE2NRC` | | | 1243.15 | eutectoid: (Pt) -> Cr3Pt + CrPt3 | (Pt): Pt 0.34; Cr3Pt: Pt 0.23 | unspecified | [2] WATSON 2006; _cites ref. 3_ | Table 1, p. 3, row 9; `ORC-HQHEKK4GZ3` | | ## Other properties ### Phase transition (11) Table: Phase transition, Cr–Pt system | Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote | |---|---:|---:|---|---|---|---|---| | Phase transition | 503.15 K | 503.15 | magnetic: T_curie; _alloy: Cr 0.25, Pt 0.75_ | experimental | [1] Preußner 2009 | Table 2, p. 4, row 8; `ORC-7772FGETWX` | | | Phase transition | 513.15 K | 513.15 | magnetic | experimental | [1] Preußner 2009 | p. 4; `ORC-D3WBCQSSQ2.5ae287` | “The DSC curves of Cr0.25 Pt0.75 is given in Fig. 5a. The hump at ∼240 ◦ C corresponds to the Curie temperature, the peak at ∼1090 ◦ C to the transformation from L12 to fcc.” | | Phase transition | 516.15 K | 516.15 | magnetic: Tcurie; _alloy: Cr 0.25, Pt 0.75_ | experimental | [1] Preußner 2009 | Table 2, p. 4, row 2; `ORC-SM75DJV3Z7` | | | Phase transition | 1358.15 K | 1358.15 | polymorphic: fcc-L1₂; _alloy: Cr 0.25, Pt 0.75_ | experimental | [1] Preußner 2009 | Table 2, p. 4, row 7; `ORC-PD5UFPVJTN` | | | Phase transition | 1370.15 K | 1370.15 | polymorphic: fcc-L12; _alloy: Cr 0.25, Pt 0.75_ | experimental | [1] Preußner 2009 | Table 2, p. 4, row 1; `ORC-243WQF2W6R` | | | Phase transition | 1395.15 K | 1395.15 | polymorphic: fcc-L10?; _alloy: Cr 0.5, Pt 0.5_ | experimental | [1] Preußner 2009 | Table 2, p. 4, row 3; `ORC-6XMZWFOFWG` | | | Phase transition | 1506.15 K | 1506.15 | polymorphic: fcc-L1₂; _alloy: Cr 0.57, Pt 0.43_ | experimental | [1] Preußner 2009 | Table 2, p. 4, row 11; `ORC-QLNH4XPAP4` | | | Phase transition | 1509.15 K | 1509.15 | polymorphic: fcc-L1₂; _alloy: Cr 0.63, Pt 0.37_ | experimental | [1] Preußner 2009 | Table 2, p. 4, row 12; `ORC-7HWRMQE6WA` | | | Phase transition | 1511.15 K | 1511.15 | polymorphic: fcc-L12; _alloy: Cr 0.63, Pt 0.37_ | experimental | [1] Preußner 2009 | Table 2, p. 4, row 6; `ORC-Q3SNHBRZA7` | | | Phase transition | 1521.15 K | 1521.15 | polymorphic: fcc-L12; _alloy: Cr 0.57, Pt 0.43_ | experimental | [1] Preußner 2009 | Table 2, p. 4, row 5; `ORC-UHTFQX7OC5` | | | Phase transition | 1572.15 K | 1572.15 | polymorphic: fcc-L10?; _alloy: Cr 0.5, Pt 0.5_ | experimental | [1] Preußner 2009 | Table 2, p. 4, row 4; `ORC-EDVGU6H74D` | | ### Phase equilibrium (1) Table: Phase equilibrium, Cr–Pt system | Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote | |---|---:|---:|---|---|---|---|---| | Phase assemblage | | 1243.15 | CrPt3 L12 + Cr3 Pt A15 + (Pt) fcc; _alloy: Pt 0.35_ | experimental | [1] Preußner 2009; _cites Waterstrat 1973_ [doi](https://doi.org/10.1007/bf02668012) | p. 5; `ORC-HLMZQQSYCM` | “Waterstrat \[24\] derived a phase diagram from quenched samples. He observed a transition from CrPt3 L12 + Cr3 Pt A15 at lower temperatures to (Pt) fcc at ∼970 ◦ C and 35 at.% Pt (symbol in Fig. 2).” | ## Sources Reporting papers the values were read from (a value cited from another work names that work in its row). 1. Johannes Preußner, Sara Prins, Rainer Völkl, Zi-Kui Liu, Uwe Glatzel, Determination of phases in the system chromium–platinum (Cr–Pt) and thermodynamic calculations, Materials Science and Engineering: A 510-511, 322-327 (2009). [doi:10.1016/j.msea.2008.10.059](https://doi.org/10.1016/j.msea.2008.10.059) 2. A WATSON, L CORNISH, R SUSS, Development of a database for the prediction of phases in Pt-based Superalloys: Cr-Pt-Ru, Rare Metals 25, 597-607 (2006). [doi:10.1016/s1001-0521(06)60106-x](https://doi.org/10.1016/s1001-0521%2806%2960106-x) ## 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). https://doi.org/10.5281/zenodo.23735569 - R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/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). https://doi.org/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). https://doi.org/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. ```bibtex @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} } ``` --- Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).