# La–Pt system

> La–Pt system: 102 accepted literature values (model expression 40, activity / EMF / Gibbs energy 24, formation 23, invariant reaction 15) and 1 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/LA-PT.html · Markdown: https://data.orchid-project.org/systems/LA-PT.md

102 accepted literature values from 1 paper(s) (experimental 72, model 30); 1 calculated phase diagram(s). 30 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/LA-PT.json) · [CSV](https://data.orchid-project.org/systems/LA-PT.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#LA-PT) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#LA-PT/LaPt-06Rei.json) · [phases (12)](https://data.orchid-project.org/phases/pages/LA-PT.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/LA-PT.html) · [Markdown](https://data.orchid-project.org/systems/LA-PT.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 72 |
| model | 30 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 15 |
| formation | 23 |
| activity / EMF / Gibbs energy | 24 |
| model expression | 40 |

## 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 |
|---|---|---|---|
| LaPt-06Rei.tdb | S. Reimann, H.-J. Schaller, J. Alloys Compd., 419, 133-39(2006). [doi:10.1016/j.jallcom.2005.10.016](https://doi.org/10.1016/j.jallcom.2005.10.016) | `2f34d1537e937633404ef7152a048739a206e64f163cf8036dd88ed698acc25f` | [viewer](https://orchid-project.org/phase-diagrams/#LA-PT/LaPt-06Rei.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/LaPt-06Rei.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/LaPt-06Rei.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| LaPt-06Rei.tdb | 2350.25 | LIQUID (x(Pt) 0.74989) + LA2PT7 (x(Pt) 0.77778) + LAPT5_D2D (x(Pt) 0.83333) |
| LaPt-06Rei.tdb | 2350.25 | LIQUID (x(Pt) 0.75002) + LA2PT7 (x(Pt) 0.77778) + LAPT5_D2D (x(Pt) 0.83333) |
| LaPt-06Rei.tdb | 1911.31 | LAPT5_D2D (x(Pt) 0.83333) + LIQUID (x(Pt) 0.95175) + FCC_A1 (x(Pt) 1) |
| LaPt-06Rei.tdb | 1911.31 | LAPT5_D2D (x(Pt) 0.83333) + LIQUID (x(Pt) 0.95178) + FCC_A1 (x(Pt) 1) |
| LaPt-06Rei.tdb | 1761.23 | LIQUID (x(Pt) 0.65543) + LAPT2_C15 (x(Pt) 0.68157) + LA2PT7 (x(Pt) 0.77778) |
| LaPt-06Rei.tdb | 1761.23 | LIQUID (x(Pt) 0.65564) + LAPT2_C15 (x(Pt) 0.68163) + LA2PT7 (x(Pt) 0.77778) |
| LaPt-06Rei.tdb | 1552.01 | LAPT_B33 (x(Pt) 0.5) + LIQUID (x(Pt) 0.56233) + LAPT2_C15 (x(Pt) 0.66675) |
| LaPt-06Rei.tdb | 1552.01 | LAPT_B33 (x(Pt) 0.5) + LIQUID (x(Pt) 0.56228) + LAPT2_C15 (x(Pt) 0.66675) |
| LaPt-06Rei.tdb | 1319.6 | LIQUID (x(Pt) 0.33913) + LA3PT2 (x(Pt) 0.4) + LAPT_B33 (x(Pt) 0.5) |
| LaPt-06Rei.tdb | 1319.6 | LIQUID (x(Pt) 0.33921) + LA3PT2 (x(Pt) 0.4) + LAPT_B33 (x(Pt) 0.5) |
| LaPt-06Rei.tdb | 1191.57 | LAPT_B33 (x(Pt) 0.5) + LA3PT4 (x(Pt) 0.57143) + LAPT2_C15 (x(Pt) 0.66667) |
| LaPt-06Rei.tdb | 1191.57 | LAPT_B33 (x(Pt) 0.5) + LA3PT4 (x(Pt) 0.57143) + LAPT2_C15 (x(Pt) 0.66667) |
| LaPt-06Rei.tdb | 1191.57 | LAPT_B33 (x(Pt) 0.5) + LA3PT4 (x(Pt) 0.57143) + LAPT2_C15 (x(Pt) 0.66667) |
| LaPt-06Rei.tdb | 1167.63 | LIQUID (x(Pt) 0.25334) + LA7PT3_D102 (x(Pt) 0.3) + LA3PT2 (x(Pt) 0.4) |
| LaPt-06Rei.tdb | 1167.63 | LIQUID (x(Pt) 0.25329) + LA7PT3_D102 (x(Pt) 0.3) + LA3PT2 (x(Pt) 0.4) |
| LaPt-06Rei.tdb | 1167.63 | LIQUID (x(Pt) 0.25368) + LA7PT3_D102 (x(Pt) 0.3) + LA3PT2 (x(Pt) 0.4) |
| LaPt-06Rei.tdb | 1134 | FCC_A1 (x(Pt) 0) + BCC_A2 (x(Pt) 0) + LIQUID (x(Pt) 0.0277) |
| LaPt-06Rei.tdb | 1009.23 | FCC_A1 (x(Pt) 0) + LIQUID (x(Pt) 0.10424) + LA7PT3_D102 (x(Pt) 0.3) |
| LaPt-06Rei.tdb | 1009.23 | FCC_A1 (x(Pt) 0) + LIQUID (x(Pt) 0.10402) + LA7PT3_D102 (x(Pt) 0.3) |
| LaPt-06Rei.tdb | 745.96 | LAPT2_C15 (x(Pt) 0.72194) + LA2PT7 (x(Pt) 0.77778) + LAPT5_D2D (x(Pt) 0.83333) |
| LaPt-06Rei.tdb | 745.96 | LAPT2_C15 (x(Pt) 0.72197) + LA2PT7 (x(Pt) 0.77778) + LAPT5_D2D (x(Pt) 0.83333) |
| LaPt-06Rei.tdb | 745.96 | LAPT2_C15 (x(Pt) 0.72195) + LA2PT7 (x(Pt) 0.77778) + LAPT5_D2D (x(Pt) 0.83333) |
| LaPt-06Rei.tdb | 550 | FCC_A1 (x(Pt) 0) + DHCP (x(Pt) 0) + LA7PT3_D102 (x(Pt) 0.3) |
| LaPt-06Rei.tdb | 470.06 | LA7PT3_D102 (x(Pt) 0.3) + LA3PT2 (x(Pt) 0.4) + LAPT_B33 (x(Pt) 0.5) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/LA/LA-PT.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/LA/LA-PT.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the La–Pt system (15)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 2440 | peritectic: Pt7La2 -> L + Pt5La | Pt7La2: La 0.222222, Pt 0.777778; Pt5La: La 0.166667, Pt 0.833333 | model | [1] Reimann 2006 | Table 6, p. 6, row 12; `ORC-B2JGJKMQMP` |  |
| 1913 | eutectic: L -> (Pt) + Pt5La | Pt5La: La 0.166667, Pt 0.833333 | experimental | [1] Reimann 2006; _cites Voronova 1983_ | Table 6, p. 6, row 14; `ORC-YL3UURYXQB` |  |
| 1911 | eutectic: L -> (Pt) + Pt5La | Pt5La: La 0.166667, Pt 0.833333 | model | [1] Reimann 2006 | Table 6, p. 6, row 13; `ORC-7WWJLVU5VQ` |  |
| 1760 | peritectic: Pt2La -> L + Pt7La2 | Pt2La: La 0.333333, Pt 0.666667; Pt7La2: La 0.222222, Pt 0.777778 | model | [1] Reimann 2006 | Table 6, p. 6, row 11; `ORC-TFUGJLZUJV` |  |
| 1557 | eutectic: L -> Pt2La + PtLa | Pt2La: La 0.333333, Pt 0.666667; PtLa: La 0.5, Pt 0.5 | experimental | [1] Reimann 2006 | Table 6, p. 6, row 10; `ORC-C4AY456RPJ` |  |
| 1552 | eutectic: L -> Pt2La + PtLa | Pt2La: La 0.333333, Pt 0.666667; PtLa: La 0.5, Pt 0.5 | model | [1] Reimann 2006 | Table 6, p. 6, row 9; `ORC-47IHXCCRRU` |  |
| 1319 | peritectic: Pt2La3 -> L + PtLa | Pt2La3: La 0.6, Pt 0.4; PtLa: La 0.5, Pt 0.5 | model | [1] Reimann 2006 | Table 6, p. 6, row 5; `ORC-UKBIR6TDAY` |  |
| 1317 | peritectic: Pt2La3 -> L + PtLa | Pt2La3: La 0.6, Pt 0.4; PtLa: La 0.5, Pt 0.5 | experimental | [1] Reimann 2006 | Table 6, p. 6, row 6; `ORC-R2OWYFXPNH` |  |
| 1190 | peritectoid: Pt4La3 -> Pt2La + PtLa | Pt4La3: La 0.428571, Pt 0.571429; Pt2La: La 0.333333, Pt 0.666667; PtLa: La 0.5, Pt 0.5 | model | [1] Reimann 2006 | Table 6, p. 6, row 7; `ORC-BJEWVEQBKW` |  |
| 1190 | peritectoid: Pt4La3 -> Pt2La + PtLa | Pt4La3: La 0.428571, Pt 0.571429; Pt2La: La 0.333333, Pt 0.666667; PtLa: La 0.5, Pt 0.5 | experimental | [1] Reimann 2006 | Table 6, p. 6, row 8; `ORC-LZLUNJ546J` |  |
| 1179 | peritectic: Pt3La7 -> L + Pt2La3 | Pt3La7: La 0.7, Pt 0.3; Pt2La3: La 0.6, Pt 0.4 | experimental | [1] Reimann 2006 | Table 6, p. 6, row 4; `ORC-Z3NVDY5E3A` |  |
| 1167 | peritectic: Pt3La7 -> L + Pt2La3 | Pt3La7: La 0.7, Pt 0.3; Pt2La3: La 0.6, Pt 0.4 | model | [1] Reimann 2006 | Table 6, p. 6, row 3; `ORC-EQTVIQ7EHG` |  |
| 1022 | eutectic |  | experimental | [1] Reimann 2006 | p. 3; `ORC-CCXMIGIZUA` | “The EMF versus T data in Fig. 2 were obtained by employing a two-phase mixture of (La) and Pt3 La7 as the alloy electrode in cell (I). The data above and below 1022 K are straight lines with different slopes. The point of intersection is the eutectic temperature, which can be obtained from this plot with high precision.” |
| 1015 | eutectic: L -> La(fcc) + Pt3La7 | Pt3La7: La 0.7, Pt 0.3 | experimental | [1] Reimann 2006 | Table 6, p. 6, row 2; `ORC-ED6D5SC3CK` |  |
| 1009 | eutectic: L -> La(fcc) + Pt3La7 | Pt3La7: La 0.7, Pt 0.3 | model | [1] Reimann 2006 | Table 6, p. 6, row 1; `ORC-6FGHDLXT74` |  |

## 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](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, La–Pt system (23)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Pt2La | [LaPt2](https://data.orchid-project.org/compounds/LaPt2.html) | -112.6 kJ/mol-atom | 1073 | experimental | -103.825 (mp-aaaaabjc) | -104.329 (oqmd-17572) | [1] Reimann 2006 | Table 2, p. 3, row 14; `ORC-2RGYOAFBJD.b01966` |  |
| Pt2La | [LaPt2](https://data.orchid-project.org/compounds/LaPt2.html) | -111.5 kJ/mol-atom | 1073 | experimental | -103.825 (mp-aaaaabjc) | -104.329 (oqmd-17572) | [1] Reimann 2006 | Table 2, p. 3, row 12; `ORC-EDPRXRW4WL.c8079d` |  |
| Pt2La | [LaPt2](https://data.orchid-project.org/compounds/LaPt2.html) | -111.4 kJ/mol-atom | 1073 | model | -103.825 (mp-aaaaabjc) | -104.329 (oqmd-17572) | [1] Reimann 2006 | Table 2, p. 3, row 15; `ORC-JHCICDQCOD.a503ae` |  |
| Pt2La | [LaPt2](https://data.orchid-project.org/compounds/LaPt2.html) | -109.8 kJ/mol-atom | 1073 | model | -103.825 (mp-aaaaabjc) | -104.329 (oqmd-17572) | [1] Reimann 2006 | Table 2, p. 3, row 13; `ORC-HCSTY6PYES.ff23f4` |  |
| Pt2La | [LaPt2](https://data.orchid-project.org/compounds/LaPt2.html) | -108.9 kJ/mol-atom | 1073 | experimental | -103.825 (mp-aaaaabjc) | -104.329 (oqmd-17572) | [1] Reimann 2006 | Table 2, p. 3, row 10; `ORC-LLMXKPCYVE.1b1145` |  |
| Pt2La | [LaPt2](https://data.orchid-project.org/compounds/LaPt2.html) | -107.9 kJ/mol-atom | 1073 | model | -103.825 (mp-aaaaabjc) | -104.329 (oqmd-17572) | [1] Reimann 2006 | Table 2, p. 3, row 11; `ORC-FW4HXE4SGE.bbf535` |  |
| Pt2La | [LaPt2](https://data.orchid-project.org/compounds/LaPt2.html) | -107.5 kJ/mol-atom | 1073 | experimental | -103.825 (mp-aaaaabjc) | -104.329 (oqmd-17572) | [1] Reimann 2006 | Table 2, p. 3, row 8; `ORC-QA4MPPXEHV.34fa39` |  |
| Pt2La | [LaPt2](https://data.orchid-project.org/compounds/LaPt2.html) | -107.1 kJ/mol-atom | 1073 | model | -103.825 (mp-aaaaabjc) | -104.329 (oqmd-17572) | [1] Reimann 2006 | Table 2, p. 3, row 9; `ORC-MNDNLWNBBZ.1dbb7a` |  |
| Pt2La | [LaPt2](https://data.orchid-project.org/compounds/LaPt2.html) | -106 kJ/mol-atom | 1073 | experimental | -103.825 (mp-aaaaabjc) | -104.329 (oqmd-17572) | [1] Reimann 2006 | Table 2, p. 3, row 6; `ORC-MKO4SURWL3.1e9813` |  |
| Pt2La | [LaPt2](https://data.orchid-project.org/compounds/LaPt2.html) | -104.7 kJ/mol-atom | 1073 | model | -103.825 (mp-aaaaabjc) | -104.329 (oqmd-17572) | [1] Reimann 2006 | Table 2, p. 3, row 7; `ORC-IYL5JLTIRI.7a99d5` |  |
| Pt2La | [LaPt2](https://data.orchid-project.org/compounds/LaPt2.html) | -104.5 kJ/mol-atom | 1073 | experimental | -103.825 (mp-aaaaabjc) | -104.329 (oqmd-17572) | [1] Reimann 2006 | Table 2, p. 3, row 5; `ORC-3FY37MU6YR.8b64fe` |  |
| Pt2La3 | [La3Pt2](https://data.orchid-project.org/compounds/La3Pt2.html) | -91.6 kJ/mol-atom | 1073 | experimental | -93.829 (mp-aaackwgn) | -94.305 (oqmd-1484299) | [1] Reimann 2006 | Table 2, p. 3, row 20; `ORC-73AOCIYKLU.55d923` |  |
| Pt2La3 | [La3Pt2](https://data.orchid-project.org/compounds/La3Pt2.html) | -87 kJ/mol-atom | 1073 | model | -93.829 (mp-aaackwgn) | -94.305 (oqmd-1484299) | [1] Reimann 2006 | Table 2, p. 3, row 21; `ORC-EP52PCMPV4.0b5995` |  |
| Pt3La7 | [La7Pt3](https://data.orchid-project.org/compounds/La7Pt3.html) | -73.2 kJ/mol-atom | 1073 | experimental | -75.213 (mp-aaacprqb) | -75.267 (oqmd-1821163) | [1] Reimann 2006 | Table 2, p. 3, row 22; `ORC-F4E3YCN7XK.6fc66c` |  |
| Pt3La7 | [La7Pt3](https://data.orchid-project.org/compounds/La7Pt3.html) | -65.6 kJ/mol-atom | 1073 | model | -75.213 (mp-aaacprqb) | -75.267 (oqmd-1821163) | [1] Reimann 2006 | Table 2, p. 3, row 23; `ORC-25QNPCCKID.e86d7a` |  |
| Pt4La3 | [La3Pt4](https://data.orchid-project.org/compounds/La3Pt4.html) | -112.3 kJ/mol-atom | 1073 | model | -110.164 (mp-aaackwkm) | -110.878 (oqmd-2027663) | [1] Reimann 2006 | Table 2, p. 3, row 17; `ORC-SQULD4DENM.edccaf` |  |
| Pt4La3 | [La3Pt4](https://data.orchid-project.org/compounds/La3Pt4.html) | -112.1 kJ/mol-atom | 1073 | experimental | -110.164 (mp-aaackwkm) | -110.878 (oqmd-2027663) | [1] Reimann 2006 | Table 2, p. 3, row 16; `ORC-CDMTOEFOXA.6202ab` |  |
| Pt5La | [LaPt5](https://data.orchid-project.org/compounds/LaPt5.html) | -76.9 kJ/mol-atom | 1073 | experimental | -72.559 (mp-aaaaacsm) | -73.375 (oqmd-17574) | [1] Reimann 2006 | Table 2, p. 3, row 1; `ORC-3PUHGPWRTF.8f20a5` |  |
| Pt5La | [LaPt5](https://data.orchid-project.org/compounds/LaPt5.html) | -71.7 kJ/mol-atom | 1073 | model | -72.559 (mp-aaaaacsm) | -73.375 (oqmd-17574) | [1] Reimann 2006 | Table 2, p. 3, row 2; `ORC-HD67Z4Z423.7cba34` |  |
| Pt7La2 |  | -91.5 kJ/mol-atom | 1073 | experimental |  |  | [1] Reimann 2006 | Table 2, p. 3, row 3; `ORC-PYT6M7F5JT.645c6f` |  |
| Pt7La2 |  | -84.3 kJ/mol-atom | 1073 | model |  |  | [1] Reimann 2006 | Table 2, p. 3, row 4; `ORC-ML7TX45AOR.7d8473` |  |
| PtLa | [LaPt](https://data.orchid-project.org/compounds/LaPt.html) | -111.8 kJ/mol-atom | 1073 | experimental | -114.088 (mp-aaacfakm) | -114.565 (oqmd-30659) | [1] Reimann 2006 | Table 2, p. 3, row 18; `ORC-5IECZBKP2B.a6b839` |  |
| PtLa | [LaPt](https://data.orchid-project.org/compounds/LaPt.html) | -110.9 kJ/mol-atom | 1073 | model | -114.088 (mp-aaacfakm) | -114.565 (oqmd-30659) | [1] Reimann 2006 | Table 2, p. 3, row 19; `ORC-DESKIIKGXR.c49811` |  |

## Other properties

### Activity / EMF / Gibbs energy (24)

Table: Activity / EMF / Gibbs energy, La–Pt system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Gibbs energy; _printed: relative partial excess Gibbs energy of La_ | -315 kJ/mol | 1073 |  | experimental | [1] Reimann 2006 | p. 1; `ORC-G7MBX27LXY` | “The phases on the platinum-rich side show pronounced negative deviations from ideal mixing behaviour; at 1073 K and infinite dilution, for instance, the relative partial excess Gibbs energy of La was determined to be -315 kJ/mol.” |
| Gibbs energy; _printed: ΔG (from EMF)_ | -96 kJ/mol | 1073 | Pt2La; _alloy: La 0.333, Pt 0.667_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 14; `ORC-2RGYOAFBJD.c914c8` |  |
| Gibbs energy; _printed: ΔG (from EMF)_ | -88.1 kJ/mol | 1073 | Pt2La; _alloy: La 0.281, Pt 0.719_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 5; `ORC-3FY37MU6YR.b1fbf6` |  |
| Gibbs energy; _printed: ΔG (from EMF)_ | -95 kJ/mol | 1073 | Pt2La; _alloy: La 0.32, Pt 0.68_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 12; `ORC-EDPRXRW4WL.e6c210` |  |
| Gibbs energy; _printed: ΔG (calculated)_ | -93 kJ/mol | 1073 | Pt2La; _alloy: La 0.306, Pt 0.694_ | model | [1] Reimann 2006 | Table 2, p. 3, row 11; `ORC-FW4HXE4SGE.374cf9` |  |
| Gibbs energy; _printed: ΔG (calculated)_ | -94.9 kJ/mol | 1073 | Pt2La; _alloy: La 0.32, Pt 0.68_ | model | [1] Reimann 2006 | Table 2, p. 3, row 13; `ORC-HCSTY6PYES.97c023` |  |
| Gibbs energy; _printed: ΔG (calculated)_ | -90.1 kJ/mol | 1073 | Pt2La; _alloy: La 0.289, Pt 0.711_ | model | [1] Reimann 2006 | Table 2, p. 3, row 7; `ORC-IYL5JLTIRI.7e7bd5` |  |
| Gibbs energy; _printed: ΔG (calculated)_ | -96.4 kJ/mol | 1073 | Pt2La; _alloy: La 0.333, Pt 0.667_ | model | [1] Reimann 2006 | Table 2, p. 3, row 15; `ORC-JHCICDQCOD.1af6ba` |  |
| Gibbs energy; _printed: ΔG (from EMF)_ | -92.9 kJ/mol | 1073 | Pt2La; _alloy: La 0.306, Pt 0.694_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 10; `ORC-LLMXKPCYVE.aac000` |  |
| Gibbs energy; _printed: ΔG (from EMF)_ | -89.7 kJ/mol | 1073 | Pt2La; _alloy: La 0.289, Pt 0.711_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 6; `ORC-MKO4SURWL3.a6fee3` |  |
| Gibbs energy; _printed: ΔG (calculated)_ | -91.6 kJ/mol | 1073 | Pt2La; _alloy: La 0.298, Pt 0.702_ | model | [1] Reimann 2006 | Table 2, p. 3, row 9; `ORC-MNDNLWNBBZ.238256` |  |
| Gibbs energy; _printed: ΔG (from EMF)_ | -91.4 kJ/mol | 1073 | Pt2La; _alloy: La 0.298, Pt 0.702_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 8; `ORC-QA4MPPXEHV.5245c6` |  |
| Gibbs energy; _printed: ΔG (from EMF)_ | -84.6 kJ/mol | 1073 | Pt2La3; _alloy: La 0.6, Pt 0.4_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 20; `ORC-73AOCIYKLU.f3370f` |  |
| Gibbs energy; _printed: ΔG (calculated)_ | -85.9 kJ/mol | 1073 | Pt2La3; _alloy: La 0.6, Pt 0.4_ | model | [1] Reimann 2006 | Table 2, p. 3, row 21; `ORC-EP52PCMPV4.4ed6e3` |  |
| Gibbs energy; _printed: ΔG (calculated)_ | -67.5 kJ/mol | 1073 | Pt3La7; _alloy: La 0.7, Pt 0.3_ | model | [1] Reimann 2006 | Table 2, p. 3, row 23; `ORC-25QNPCCKID.e02efa` |  |
| Gibbs energy; _printed: ΔG (from EMF)_ | -67 kJ/mol | 1073 | Pt3La7; _alloy: La 0.7, Pt 0.3_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 22; `ORC-F4E3YCN7XK.01e77a` |  |
| Gibbs energy; _printed: ΔG (from EMF)_ | -99.1 kJ/mol | 1073 | Pt4La3; _alloy: La 0.429, Pt 0.571_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 16; `ORC-CDMTOEFOXA.d6ffa3` |  |
| Gibbs energy; _printed: ΔG (calculated)_ | -99.2 kJ/mol | 1073 | Pt4La3; _alloy: La 0.429, Pt 0.571_ | model | [1] Reimann 2006 | Table 2, p. 3, row 17; `ORC-SQULD4DENM.2c9029` |  |
| Gibbs energy; _printed: ΔG (from EMF)_ | -64.4 kJ/mol | 1073 | Pt5La; _alloy: La 0.167, Pt 0.833_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 1; `ORC-3PUHGPWRTF.4df941` |  |
| Gibbs energy; _printed: ΔG (calculated)_ | -64.7 kJ/mol | 1073 | Pt5La; _alloy: La 0.167, Pt 0.833_ | model | [1] Reimann 2006 | Table 2, p. 3, row 2; `ORC-HD67Z4Z423.fe9705` |  |
| Gibbs energy; _printed: ΔG (calculated)_ | -77.3 kJ/mol | 1073 | Pt7La2; _alloy: La 0.22, Pt 0.78_ | model | [1] Reimann 2006 | Table 2, p. 3, row 4; `ORC-ML7TX45AOR.f6a7cf` |  |
| Gibbs energy; _printed: ΔG (from EMF)_ | -77 kJ/mol | 1073 | Pt7La2; _alloy: La 0.22, Pt 0.78_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 3; `ORC-PYT6M7F5JT.3cefb8` |  |
| Gibbs energy; _printed: ΔG (from EMF)_ | -101.1 kJ/mol | 1073 | PtLa; _alloy: La 0.5, Pt 0.5_ | experimental | [1] Reimann 2006 | Table 2, p. 3, row 18; `ORC-5IECZBKP2B.477716` |  |
| Gibbs energy; _printed: ΔG (calculated)_ | -101 kJ/mol | 1073 | PtLa; _alloy: La 0.5, Pt 0.5_ | model | [1] Reimann 2006 | Table 2, p. 3, row 19; `ORC-DESKIIKGXR.79b091` |  |

### Model expression (40)

Table: Model expression, La–Pt system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| emf expression term; _printed: E°_ | 0.7951 V |  | UNKNOWN; _alloy: La 0.32, Pt 0.68_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 20; `ORC-24PH46VDDV` |  |
| emf expression term; _printed: E°_ | 0.3739 V |  | UNKNOWN; _alloy: La 0.46, Pt 0.54_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 26; `ORC-2VRJKAJNRP` |  |
| emf expression term; _printed: E°_ | 0.3929 V |  | UNKNOWN; _alloy: La 0.414, Pt 0.586_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 24; `ORC-363INOYRIF` |  |
| emf expression term; _printed: E°_ | 0.6489 V |  | UNKNOWN; _alloy: La 0.219, Pt 0.781_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 10; `ORC-3CHCW4T5MZ` |  |
| emf expression term; _printed: E°_ | 0.7179 V |  | UNKNOWN; _alloy: La 0.298, Pt 0.702_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 18; `ORC-3MW7FSXYNR` |  |
| emf expression term; _printed: E°_ | 0.3846 V |  | UNKNOWN; _alloy: La 0.448, Pt 0.552_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 25; `ORC-443FD5JSMX` |  |
| emf expression term; _printed: E°_ | 0.8943 V |  | UNKNOWN; _alloy: La 0.182, Pt 0.818_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 6; `ORC-6BAPZSBFLF` |  |
| emf expression term; _printed: E°_ | 1.5456 V |  | UNKNOWN; _alloy: La 0.047, Pt 0.953_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 3; `ORC-6CHIHDCGFD` |  |
| emf expression term; _printed: E°_ | 0.7941 V |  | UNKNOWN; _alloy: La 0.281, Pt 0.719_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 16; `ORC-6MOZSSDY3B` |  |
| emf expression term; _printed: E°_ | 0.0513 V |  | UNKNOWN; _alloy: La 0.551, Pt 0.449_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 31; `ORC-7R2CZV4EXH` |  |
| emf expression term; _printed: E°_ | 0.3671 V |  | UNKNOWN; _alloy: La 0.35, Pt 0.65_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 21; `ORC-BKIK64H327` |  |
| emf expression term; _printed: E°_ | 0.0494 V |  | UNKNOWN; _alloy: La 0.649, Pt 0.351_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 37; `ORC-C6HASVQULK` |  |
| emf expression term; _printed: E°_ | 0.0682 V |  | UNKNOWN; _alloy: La 0.632, Pt 0.368_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 36; `ORC-CL6YLLMOD2` |  |
| emf expression term; _printed: E°_ | 0.6797 V |  | UNKNOWN; _alloy: La 0.249, Pt 0.751_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 14; `ORC-DA2PEM36FT` |  |
| emf expression term; _printed: E°_ | 0.0315 V |  | UNKNOWN; _alloy: La 0.54, Pt 0.46_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 30; `ORC-EU57IFUDJH` |  |
| emf expression term; _printed: E°_ | 0.0725 V |  | UNKNOWN; _alloy: La 0.579, Pt 0.421_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 33; `ORC-FMA4WZ76EO` |  |
| emf expression term; _printed: E°_ | 0.0445 V |  | UNKNOWN; _alloy: La 0.57, Pt 0.43_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 32; `ORC-GAAKAGWION` |  |
| emf expression term; _printed: E°_ | 0.3805 V |  | UNKNOWN; _alloy: La 0.361, Pt 0.639_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 22; `ORC-H4RQGAYIXC` |  |
| emf expression term; _printed: E°_ | 0.084 V |  | UNKNOWN; _alloy: La 0.62, Pt 0.38_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 35; `ORC-HDWHUBUPZ6` |  |
| emf expression term; _printed: E°_ | 0.8496 V |  | UNKNOWN; _alloy: La 0.306, Pt 0.694_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 19; `ORC-HNCAGMG3FG` |  |
| emf expression term; _printed: E°_ | 1.0551 V |  | UNKNOWN; _alloy: La 0.204, Pt 0.796_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 9; `ORC-HVL3LLGJS6` |  |
| emf expression term; _printed: E°_ | 0.3967 V |  | UNKNOWN; _alloy: La 0.491, Pt 0.509_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 28; `ORC-HYABYPWHBI` |  |
| emf expression term; _printed: E°_ | 1.381 V |  | UNKNOWN; _alloy: La 0.028, Pt 0.972_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 2; `ORC-HZB254ACCC` |  |
| emf expression term; _printed: E°_ | 0.3376 V |  | UNKNOWN; _alloy: La 0.47, Pt 0.53_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 27; `ORC-KGW5B3C6BR` |  |
| emf expression term; _printed: E°_ | 1.1479 V |  | UNKNOWN; _alloy: La 0.19, Pt 0.81_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 8; `ORC-KT6HUULO7D` |  |
| emf expression term; _printed: E°_ | 0.0473 V |  | UNKNOWN; _alloy: La 0.683, Pt 0.317_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 38; `ORC-MFWXJBLFQC` |  |
| emf expression term; _printed: E°_ | 1.4736 V |  | UNKNOWN; _alloy: La 0.1, Pt 0.9_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 4; `ORC-MJ44S7SQY7` |  |
| emf expression term; _printed: E°_ | 0.7988 V |  | UNKNOWN; _alloy: La 0.24, Pt 0.76_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 12; `ORC-MP62O7HR7W` |  |
| emf expression term; _printed: E°_ | 0.0435 V |  | UNKNOWN; _alloy: La 0.85, Pt 0.15_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 39; `ORC-MVWCUQB43B` |  |
| emf expression term; _printed: E°_ | 1.8263 V |  | UNKNOWN; _alloy: La 0.02, Pt 0.98_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 1; `ORC-NCC4JJU2SV` |  |
| emf expression term; _printed: E°_ | 1.1552 V |  | UNKNOWN; _alloy: La 0.19, Pt 0.81_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 7; `ORC-O6CSGUPD6N` |  |
| emf expression term; _printed: E°_ | -0.0152 V |  | UNKNOWN; _alloy: La 0.581, Pt 0.419_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 34; `ORC-PKDUYWNBGU` |  |
| emf expression term; _printed: E°_ | 0.8286 V |  | UNKNOWN; _alloy: La 0.228, Pt 0.772_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 11; `ORC-PTA4AGBHL7` |  |
| emf expression term; _printed: E°_ | 0.8632 V |  | UNKNOWN; _alloy: La 0.26, Pt 0.74_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 15; `ORC-S4QF2GYNBY` |  |
| emf expression term; _printed: E°_ | 1.7389 V |  | UNKNOWN; _alloy: La 0.143, Pt 0.857_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 5; `ORC-TUXN3QLD2B` |  |
| emf expression term; _printed: E°_ | -0.0052 V |  | UNKNOWN; _alloy: La 0.951, Pt 0.049_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 40; `ORC-U4GWB7AS6I` |  |
| emf expression term; _printed: E°_ | 0.8282 V |  | UNKNOWN; _alloy: La 0.241, Pt 0.759_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 13; `ORC-UOTVKLQK5A` |  |
| emf expression term; _printed: E°_ | 0.3712 V |  | UNKNOWN; _alloy: La 0.388, Pt 0.612_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 23; `ORC-WF6DY3ADBV` |  |
| emf expression term; _printed: E°_ | -0.183 V |  | UNKNOWN; _alloy: La 0.524, Pt 0.476_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 29; `ORC-XBY5NPUQSW` |  |
| emf expression term; _printed: E°_ | 0.8424 V |  | UNKNOWN; _alloy: La 0.289, Pt 0.711_ | experimental | [1] Reimann 2006 | Table 1, p. 2, row 17; `ORC-XMA775ICKW` |  |

## Sources

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

1. S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006). [doi:10.1016/j.jallcom.2005.10.016](https://doi.org/10.1016/j.jallcom.2005.10.016)

## 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=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).