# P–Si system

> P–Si system: 69 accepted literature values (invariant reaction 20, formation 14, heat capacity / entropy / enthalpy 12, phase equilibrium 7) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/P-SI.html · Markdown: https://data.orchid-project.org/systems/P-SI.md

69 accepted literature values from 3 paper(s) (experimental 33, model 27, unspecified 9); 0 calculated phase diagram(s). 12 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/P-SI.json) · [CSV](https://data.orchid-project.org/systems/P-SI.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#P-SI) · [phases (10)](https://data.orchid-project.org/phases/pages/P-SI.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/P-SI.html) · [Markdown](https://data.orchid-project.org/systems/P-SI.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 33 |
| model | 27 |
| unspecified | 9 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 20 |
| phase transition | 4 |
| phase equilibrium | 7 |
| formation | 14 |
| heat capacity / entropy / enthalpy | 12 |
| activity / EMF / Gibbs energy | 5 |
| crystal structure | 6 |
| model expression | 1 |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/P/P-SI.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/P/P-SI.json) · [CALPHAD hull SiP-04Din-LB](https://data.orchid-project.org/hulls/calphad-sgte/P/P-SI--SiP-04Din-LB.json) · [CALPHAD hull SiP-14Lia](https://data.orchid-project.org/hulls/calphad-sgte/P/P-SI--SiP-14Lia.json) · [CALPHAD hull SiP-21Don](https://data.orchid-project.org/hulls/calphad-sgte/P/P-SI--SiP-21Don.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the P–Si system (20)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1451.15 | other: Congruent melting L = SiP2 | L: P 0.666667, Si 0.333333; SiP2: P 0.666667, Si 0.333333 | experimental | [1] Liang 2014; _cites Ugai 1987_ | Table 4, p. 7, row 11; `ORC-QNLCINLMLP` |  |
| 1443.15 | other: Congruent melting L = SiP | L: P 0.5, Si 0.5; SiP: P 0.5, Si 0.5 | experimental | [1] Liang 2014; _cites Ugai 1987_ | Table 4, p. 7, row 7; `ORC-SFDR2OKXSO` |  |
| 1442.15 | other: Congruent melting L = SiP2 | L: P 0.666667, Si 0.333333; SiP2: P 0.666667, Si 0.333333 | model | [1] Liang 2014 | Table 4, p. 7, row 13; `ORC-LRVNE64F2W` |  |
| 1434.15 | other: Congruent melting L = SiP | L: P 0.5, Si 0.5; SiP: P 0.5, Si 0.5 | model | [1] Liang 2014 | Table 4, p. 7, row 10; `ORC-ZJC5AOTJ76` |  |
| 1430.15 | eutectic: Eutectic L = SiP + SiP2 | SiP: P 0.5, Si 0.5 (basis unresolved); SiP2: P 0.666667, Si 0.333333 (basis unresolved) | model | [1] Liang 2014 | Table 4, p. 7, row 16; `ORC-2SGFQQTBP6` |  |
| 1429.15 | other: Congruent melting L = SiP2 | L: P 0.666667, Si 0.333333; SiP2: P 0.666667, Si 0.333333 | model | [1] Liang 2014; _cites Jung 2012_ [doi](https://doi.org/10.1007/s11837-012-0387-0) | Table 4, p. 7, row 12; `ORC-TMIG6B7N6J` |  |
| 1412.15 | other: Congruent melting L = SiP | L: P 0.5, Si 0.5; SiP: P 0.5, Si 0.5 | experimental | [1] Liang 2014; _cites Safarian 2011_ [doi](https://doi.org/10.1557/jmr.2011.130) | Table 4, p. 7, row 8; `ORC-ZBHEO6HES3` |  |
| 1410.15 | other: Congruent melting L = SiP | L: P 0.5, Si 0.5; SiP: P 0.5, Si 0.5 | model | [1] Liang 2014; _cites Jung 2012_ [doi](https://doi.org/10.1007/s11837-012-0387-0) | Table 4, p. 7, row 9; `ORC-7WZPFNNWJH` |  |
| 1407.15 | eutectic: Eutectic L = (Si) + SiP | SiP: P 0.5, Si 0.5 (basis unresolved) | model | [1] Liang 2014 | Table 4, p. 7, row 6; `ORC-LP7V4IYNKS` |  |
| 1407.15 | eutectic: Eutectic L = SiP + SiP2 | SiP: P 0.5, Si 0.5; SiP2: P 0.666667, Si 0.333333 | model | [1] Liang 2014; _cites Jung 2012_ [doi](https://doi.org/10.1007/s11837-012-0387-0) | Table 4, p. 7, row 15; `ORC-UCDK6KJI62` |  |
| 1404.15 | eutectic: Eutectic L = (Si) + SiP | SiP: P 0.5, Si 0.5 (basis unresolved) | model | [1] Liang 2014 | Table 4, p. 7, row 5; `ORC-HBPYQYPWNN` |  |
| 1404.15 | eutectic: Eutectic L = (Si) + SiP | L: P 0.32807, Si 0.67193; SiP: P 0.5, Si 0.5 | experimental | [1] Liang 2014; _cites Giessen 1959_ | Table 4, p. 7, row 1; `ORC-J4UNSTBMW3` |  |
| 1404.15 | eutectic: Eutectic L = (Si) + SiP | SiP: P 0.5, Si 0.5 | experimental | [1] Liang 2014; _cites Ugai 1987_ | Table 4, p. 7, row 2; `ORC-VBQKNR6IV4` |  |
| 1404 | eutectic: Si-SiP-liq. eutectic | SiP: P 0.5 | unspecified | [2] Favre 2024; _cites ref. 12_ | Table 9, p. 50, row 2; `ORC-LUQUQLSFDS` |  |
| 1404 | eutectic: Si-SiP-liq. eutectic | SiP: P 0.5 | unspecified | [2] Favre 2024; _cites as well as Safarian and Tangstad\[6\] namely for liquidus retained data_ | Table 9, p. 50, row 1; `ORC-OT3ACPUAUY` |  |
| 1402.15 | eutectic: Eutectic L = (Si) + SiP | SiP: P 0.5, Si 0.5 (basis unresolved) | experimental | [1] Liang 2014; _cites Safarian 2011_ [doi](https://doi.org/10.1557/jmr.2011.130) | Table 4, p. 7, row 3; `ORC-7LCFIXRLQ5` |  |
| 1402 | eutectic: Si-SiP-liq. eutectic | SiP: P 0.5 | unspecified | [2] Favre 2024; _cites ref. 6_ | Table 9, p. 50, row 4; `ORC-TTEH7ZEXXN` |  |
| 1400.15 | eutectic: Eutectic L = (Si) + SiP | SiP: P 0.5, Si 0.5 (basis unresolved) | model | [1] Liang 2014; _cites Jung 2012_ [doi](https://doi.org/10.1007/s11837-012-0387-0) | Table 4, p. 7, row 4; `ORC-M6BNO3MRCF` |  |
| 1400 | eutectic: Si-SiP-liq. eutectic | SiP: P 0.5 | experimental | [2] Favre 2024; _cites values for SiP and – (ii) Philipp and Schmidt \[59\] for SiP2_ | Table 9, p. 50, row 3; `ORC-LCKUK377GY` |  |
| 1398.15 | eutectic: Eutectic L = SiP + SiP2 | SiP: P 0.5, Si 0.5; SiP2: P 0.666667, Si 0.333333 | experimental | [1] Liang 2014; _cites Ugai 1987_ | Table 4, p. 7, row 14; `ORC-YTGOVHDTWU` |  |

## 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, P–Si system (14)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| SiP | [SiP](https://data.orchid-project.org/compounds/SiP.html) | -39.52 kJ/mol-atom | 298.15 | unspecified | -13.047 (mp-aaaaaedq) | -26.653 (oqmd-1784005) | [1] Liang 2014; _cites ref. 1938Bil_ | Table 5, p. 8, row 3; `ORC-2XRUHNMQ2N.7d5e7f` |  |
| SiP | [SiP](https://data.orchid-project.org/compounds/SiP.html) | -37.6 kJ/mol-atom | 298.15 | unspecified | -13.047 (mp-aaaaaedq) | -26.653 (oqmd-1784005) | [1] Liang 2014; _cites ref. 1976Kor_ | Table 5, p. 8, row 4; `ORC-MP6G43JR7T.b71241` |  |
| SiP | [SiP](https://data.orchid-project.org/compounds/SiP.html) | -31.65 kJ/mol-atom | 298.15 | model | -13.047 (mp-aaaaaedq) | -26.653 (oqmd-1784005) | [1] Liang 2014 | Table 5, p. 8, row 7; `ORC-ID3HWJIUPV.6e54b8` |  |
| SiP | [SiP](https://data.orchid-project.org/compounds/SiP.html) | -31.65 kJ/mol-atom | 298.15 | model | -13.047 (mp-aaaaaedq) | -26.653 (oqmd-1784005) | [1] Liang 2014; _cites ref. 2012Jun_ | Table 5, p. 8, row 6; `ORC-ZCELURSFSI.3c97fc` |  |
| SiP | [SiP](https://data.orchid-project.org/compounds/SiP.html) | -31.61 kJ/mol-atom | 298.15 | model | -13.047 (mp-aaaaaedq) | -26.653 (oqmd-1784005) | [1] Liang 2014; _cites ref. 2011Aru_ | Table 5, p. 8, row 5; `ORC-53YAL3Y255.04280c` |  |
| SiP | [SiP](https://data.orchid-project.org/compounds/SiP.html) | -30.95 kJ/mol-atom | 298.15 | unspecified | -13.047 (mp-aaaaaedq) | -26.653 (oqmd-1784005) | [1] Liang 2014; _cites ref. 1977Bar_ | Table 5, p. 8, row 2; `ORC-JQBKPARQEG.6cb2a5` |  |
| SiP(liq) |  | -63.746 kJ/mol (basis unstated) | 1443 | model |  |  | [2] Favre 2024; _cites ref. 11_ | Table 3, p. 35, row 1; `ORC-GBOLDEHYJP.ca21e1` |  |
| SiP(liq) |  | -46.893 kJ/mol (basis unstated) | 1443 | model |  |  | [2] Favre 2024; _cites ref. 11_ | Table 3, p. 35, row 2; `ORC-YTEX2VAE7M.504f46` |  |
| SiP(liq) |  | 36.202 kJ/mol (basis unstated) | 1418 | model |  |  | [2] Favre 2024 | Table 3, p. 35, row 3; `ORC-L7YZYDWIKI.ca9bcb` |  |
| SiP(s) |  | -246.525 kJ/mol (basis unstated) | 1443 | model |  |  | [2] Favre 2024; _cites ref. 11_ | Table 3, p. 35, row 1; `ORC-GBOLDEHYJP.a19123` |  |
| SiP(s) |  | -147.253 kJ/mol (basis unstated) | 1443 | model |  |  | [2] Favre 2024; _cites ref. 11_ | Table 3, p. 35, row 2; `ORC-YTEX2VAE7M.5f63f9` |  |
| SiP(s) |  | -66.425 kJ/mol (basis unstated) | 1418 | model |  |  | [2] Favre 2024 | Table 3, p. 35, row 3; `ORC-L7YZYDWIKI.c9e067` |  |
| SiP2 | [SiP2](https://data.orchid-project.org/compounds/SiP2.html) | -26.69 kJ/mol-atom | 298.15 | model | -12.072 (mp-aaaaaoum) | -27.964 (oqmd-7989) | [1] Liang 2014 | Table 5, p. 8, row 9; `ORC-THR5BHMMLZ.0b24fe` |  |
| SiP2 | [SiP2](https://data.orchid-project.org/compounds/SiP2.html) | -26.43 kJ/mol-atom | 298.15 | model | -12.072 (mp-aaaaaoum) | -27.964 (oqmd-7989) | [1] Liang 2014; _cites ref. 2012Jun_ | Table 5, p. 8, row 8; `ORC-27U45J3KDP.5aacdd` |  |

## Other properties

### Phase transition (4)

Table: Phase transition, P–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1237.15 K | 1237.15 | other | experimental | [1] Liang 2014 | p. 2; `ORC-HRX4SYSFEP` | “Differential thermal analysis in static air from room temperature to 1015 C shows heating signals in the range 964-990 C but no thermal activity was seen upon cooling.” |
| Phase transition | 1375 K | 1375 | other | model | [2] Favre 2024 | p. 48; `ORC-XVP6TYZ4B5` | “We observed that applying a 1 bar pressure, the SiP compound decomposes at 1375K before melting - equilibrium with 1 bar pressure of P2(g) + P4(g).” |
| Phase transition | 1410.15 K | 1410.15 | congruent melting | model | [1] Liang 2014; _cites Jung 2012_ [doi](https://doi.org/10.1007/s11837-012-0387-0) | p. 9; `ORC-GIVOT6PXH5` | “They chose 1137 C as congruent melting temperature of SiP, but it is noted that the pressure-discrepancy increases in their Gas + SiP + liquid range.\[5\]” |
| Phase transition | 1443.15 K | 1443.15 | congruent melting | experimental | [1] Liang 2014; _cites Ugai 1987_ | p. 9; `ORC-VN3BGEVYTZ.704482` | “It was found impossible to reconcile in a consistent thermodynamic assessment the experimentally determined\[34\] high congruent melting temperature of SiP (1170 C, Fig. 2) with the low experimental pressure value at that point from the same group of authors\[26\] (2.7 bar, Fig. 4); the calculated values are 1161 C and 13 bar.” |

### Phase equilibrium (7)

Table: Phase equilibrium, P–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase composition |  | 823 | Si + (Si); _Si: P 0.0011, Si 0.9989; (Si): P 0.0011, Si 0.9989_ | experimental | [2] Favre 2024; _cites ref. 22_ | Table 2, p. 20, row 6; `ORC-SG3DC7AMUO` |  |
| Phase composition |  | 923 | Si + (Si); _Si: P 0.0013, Si 0.9987; (Si): P 0.0013, Si 0.9987_ | experimental | [2] Favre 2024; _cites ref. 22_ | Table 2, p. 20, row 7; `ORC-HGDXZNJ2A2` |  |
| Phase composition |  | 973 | Si + (Si); _Si: P 0.0014, Si 0.9986; (Si): P 0.0014, Si 0.9986_ | experimental | [2] Favre 2024; _cites ref. 16_ | Table 2, p. 20, row 1; `ORC-2P3KOFC5US` |  |
| Phase composition |  | 1073 | Si + (Si); _Si: P 0.0032, Si 0.9968; (Si): P 0.0032, Si 0.9968_ | experimental | [2] Favre 2024; _cites ref. 16_ | Table 2, p. 20, row 2; `ORC-II63ENGKC5` |  |
| Phase composition |  | 1173 | Si + (Si); _Si: P 0.0045, Si 0.9955; (Si): P 0.0045, Si 0.9955_ | experimental | [2] Favre 2024; _cites ref. 16_ | Table 2, p. 20, row 3; `ORC-T7PT4V6YXG` |  |
| Phase composition |  | 1273 | Si + (Si); _Si: P 0.005, Si 0.995; (Si): P 0.005, Si 0.995_ | experimental | [2] Favre 2024; _cites ref. 16_ | Table 2, p. 20, row 4; `ORC-STQ54NZYJP` |  |
| Phase composition |  | 1473 | Si + (Si); _Si: P 0.0043, Si 0.9957; (Si): P 0.0043, Si 0.9957_ | experimental | [2] Favre 2024; _cites ref. 16_ | Table 2, p. 20, row 5; `ORC-CES2577KXC` |  |

### Heat capacity / entropy / enthalpy (12)

Table: Heat capacity / entropy / enthalpy, P–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: S°298(SiP, est.)_ | 65 J/mol (basis unstated)/K | 298 (>) | SiP; _alloy: Si 0.5_ | experimental | [2] Favre 2024; _cites ref. 59_ | Table 6, p. 44, row 3; `ORC-BUGEDAVF24` |  |
| Entropy; _printed: S°298(SiP)_ | 34.78 J/mol (basis unstated)/K | 298.15 | SiP; _alloy: Si 0.5_ | experimental | [2] Favre 2024; _cites ref. 55_ | Table 6, p. 44, row 2; `ORC-2JFYAROUR7.3a38a5` |  |
| Entropy; _printed: S°298_ | 6.3 J/mol-atom/K | 298.15 | SiP; _alloy: Si 0.5_ | unspecified | [1] Liang 2014; _cites ref. 1938Bil_ | Table 5, p. 8, row 3; `ORC-2XRUHNMQ2N.dd16ad` |  |
| Entropy; _printed: S°298_ | 14.7 J/mol-atom/K | 298.15 | SiP; _alloy: Si 0.5_ | model | [1] Liang 2014; _cites ref. 2011Aru_ | Table 5, p. 8, row 5; `ORC-53YAL3Y255.c4cd6c` |  |
| Entropy; _printed: S°298_ | 17.37 J/mol-atom/K | 298.15 | SiP; _alloy: Si 0.5_ | model | [1] Liang 2014 | Table 5, p. 8, row 7; `ORC-ID3HWJIUPV.18585b` |  |
| Entropy; _printed: S°298_ | 16.3 J/mol-atom/K | 298.15 | SiP; _alloy: Si 0.5_ | unspecified | [1] Liang 2014; _cites ref. 1977Bar_ | Table 5, p. 8, row 2; `ORC-JQBKPARQEG.aa6aea` |  |
| Entropy; _printed: S°298_ | 7.95 J/mol-atom/K | 298.15 | SiP; _alloy: Si 0.5_ | unspecified | [1] Liang 2014; _cites ref. 1976Kor_ | Table 5, p. 8, row 4; `ORC-MP6G43JR7T.225859` |  |
| Entropy; _printed: S°298_ | 17.37 J/mol-atom/K | 298.15 | SiP; _alloy: Si 0.5_ | experimental | [1] Liang 2014; _cites ref. 1979Uga_ | Table 5, p. 8, row 1; `ORC-WR54NXQDJY` |  |
| Entropy; _printed: S°298_ | 17.37 J/mol-atom/K | 298.15 | SiP; _alloy: Si 0.5_ | model | [1] Liang 2014; _cites ref. 2012Jun_ | Table 5, p. 8, row 6; `ORC-ZCELURSFSI.d68042` |  |
| Entropy; _printed: S°298_ | 22.33 J/mol-atom/K | 298.15 | SiP2; _alloy: Si 0.333333_ | model | [1] Liang 2014; _cites ref. 2012Jun_ | Table 5, p. 8, row 8; `ORC-27U45J3KDP.d5c3c5` |  |
| Entropy; _printed: S°298_ | 21.35 J/mol-atom/K | 298.15 | SiP2; _alloy: Si 0.333333_ | model | [1] Liang 2014 | Table 5, p. 8, row 9; `ORC-THR5BHMMLZ.3a887a` |  |
| Heat capacity; _printed: C°p(SiP, 298 K)_ | 35.23 J/mol (basis unstated)/K | 298.15 | SiP; _alloy: Si 0.5_ | experimental | [2] Favre 2024; _cites ref. 55_ | Table 6, p. 44, row 2; `ORC-2JFYAROUR7.78fcf5` |  |

### Activity / EMF / Gibbs energy (5)

Table: Activity / EMF / Gibbs energy, P–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Vapour pressure; _printed: p_ | 3.37 bar | 1398 |  | experimental | [2] Favre 2024 | p. 29; `ORC-6SLKSMVGRW` | “Eutectic temperature between the two compounds is 1398K and 3.37 bar obtained by extrapolation.” |
| Vapour pressure; _printed: p_ | 0.944 bar | 1400 |  | experimental | [2] Favre 2024 | p. 29; `ORC-WKRWLIYPNJ` | “A minimum temperature as extrapolated corresponds to the eutectic between Si and SiP is at about 1400 K for 0.944 bar according to their original graph.” |
| Vapour pressure; _printed: p_ | 2.5 bar | 1439 |  | experimental | [2] Favre 2024; _cites ref. 45_ | p. 29; `ORC-ZH6WKS6GGU` | “The maximum temperature would correspond to the congruent melting point of SiP that is observed at 1439 ± 5 K for 2.5 bar a pressure composed mainly by P2(g) + P4(g).” |
| Vapour pressure; _printed: total pressure_ | 2.7 bar | 1443 |  | experimental | [2] Favre 2024 | p. 29; `ORC-4XANEU27M5.24440e` | “Full results allow the authors to propose the melting temperature of the two compounds as well as their total pressure in equilibrium: for SiP 1443K and 2.7 bar and for SiP2 1451K and 3.7 bar.” |
| Vapour pressure; _printed: total pressure_ | 3.7 bar | 1451 |  | experimental | [2] Favre 2024 | p. 29; `ORC-4XANEU27M5.6a66a8` | “Full results allow the authors to propose the melting temperature of the two compounds as well as their total pressure in equilibrium: for SiP 1443K and 2.7 bar and for SiP2 1451K and 3.7 bar.” |

### Crystal structure (6)

Table: Crystal structure, P–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 20.49 Å | 298.15 | SiP; _alloy: Si 0.5_ | experimental | [3] Liu 2016; _cites Wadsten 1975_ | Table 1, p. 3, row 1; `ORC-IWOIF4ZWOG.486cf3` |  |
| Lattice a | 13.97 Å | 298.15 | SiP2; _alloy: Si 0.333333_ | experimental | [3] Liu 2016; _cites Wadsten 1967_ [doi](https://doi.org/10.3891/acta.chem.scand.21-0593) | Table 1, p. 3, row 2; `ORC-OF63PCEMKK.c55885` |  |
| Lattice b | 13.61 Å | 298.15 | SiP; _alloy: Si 0.5_ | experimental | [3] Liu 2016; _cites Wadsten 1975_ | Table 1, p. 3, row 1; `ORC-IWOIF4ZWOG.fc1369` |  |
| Lattice b | 10.08 Å | 298.15 | SiP2; _alloy: Si 0.333333_ | experimental | [3] Liu 2016; _cites Wadsten 1967_ [doi](https://doi.org/10.3891/acta.chem.scand.21-0593) | Table 1, p. 3, row 2; `ORC-OF63PCEMKK.3e1b9d` |  |
| Lattice c | 3.51 Å | 298.15 | SiP; _alloy: Si 0.5_ | experimental | [3] Liu 2016; _cites Wadsten 1975_ | Table 1, p. 3, row 1; `ORC-IWOIF4ZWOG.1868c9` |  |
| Lattice c | 3.43 Å | 298.15 | SiP2; _alloy: Si 0.333333_ | experimental | [3] Liu 2016; _cites Wadsten 1967_ [doi](https://doi.org/10.3891/acta.chem.scand.21-0593) | Table 1, p. 3, row 2; `ORC-OF63PCEMKK.d902ad` |  |

### Model expression (1)

Table: Model expression, P–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Heat capacity; _printed: C°p(SiP2)_ | expression: 67.02 + 17.14·10^-3 T | 298 (>) | SiP2 | experimental | [2] Favre 2024; _cites ref. 59_ | Table 6, p. 44, row 3; `ORC-RZNCWRDZVZ` |  |

## Sources

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

1. Song-Mao Liang, Rainer Schmid-Fetzer, Modeling of Thermodynamic Properties and Phase Equilibria of the Si-P System, J. Phase Equilib. Diffus. 35, 24-35 (2014). [doi:10.1007/s11669-013-0269-3](https://doi.org/10.1007/s11669-013-0269-3)
2. Simon Favre, Ioana Nuta, Guy Chichignoud, Evelyne Fischer, Christian Chatillon, Critical assessment of the Si-P system: P solubility in the Si-rich region and refining by phosphorus distillation, Calphad 87, 102758 (2024). [doi:10.1016/j.calphad.2024.102758](https://doi.org/10.1016/j.calphad.2024.102758)
3. Ya Liu, Bin Zhou, Wei Lv, Changjun Wu, Xuping Su, Jianhua Wang, Experimental investigation and thermodynamic assessment of the Zn–Si–P system, Surface and Coatings Technology 306, 370-377 (2016). [doi:10.1016/j.surfcoat.2016.01.016](https://doi.org/10.1016/j.surfcoat.2016.01.016)

## 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-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); 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); 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.

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_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/).