# P–Zn system

> P–Zn system: 85 accepted literature values (formation 34, phase transition 25, invariant reaction 18, crystal structure 8) 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-ZN.html · Markdown: https://data.orchid-project.org/systems/P-ZN.md

85 accepted literature values from 3 paper(s) (experimental 37, model 35, unspecified 13); 0 calculated phase diagram(s). 7 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-ZN.json) · [CSV](https://data.orchid-project.org/systems/P-ZN.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#P-ZN) · [phases (13)](https://data.orchid-project.org/phases/pages/P-ZN.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/P-ZN.html) · [Markdown](https://data.orchid-project.org/systems/P-ZN.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 37 |
| model | 35 |
| unspecified | 13 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 18 |
| phase transition | 25 |
| formation | 34 |
| crystal structure | 8 |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/P/P-ZN.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/P/P-ZN.json) · [CALPHAD hull ZnP-09Tu](https://data.orchid-project.org/hulls/calphad-sgte/P/P-ZN--ZnP-09Tu.json) · [CALPHAD hull ZnP-16Liu](https://data.orchid-project.org/hulls/calphad-sgte/P/P-ZN--ZnP-16Liu.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the P–Zn system (18)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1269.15 | eutectic: L -> ZnP2 + Zn3P2 | L: P 0.0059; ZnP2: P 0.666667; Zn3P2: P 0.4 | unspecified | [1] Liu 2016; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 5, p. 6, row 9; `ORC-RV7DUX4GTN` |  |
| 1267.15 | eutectic: L -> ZnP2 + Zn3P2 | L: P 0.00594; ZnP2: P 0.666667; Zn3P2: P 0.4 | unspecified | [1] Liu 2016 | Table 5, p. 6, row 8; `ORC-UUAFFVPXUH` |  |
| 1258.15 | eutectic: L -> βZn3P2 + αZnP2 | L: P 0.57; βZn3P2: P 0.4; αZnP2: P 0.666 | model | [2] Ghasemi 2019 | Table 4, p. 6, row 22; `ORC-DKLWJN5R5D` |  |
| 1256.15 | eutectic: L -> βZn3P2 + αZnP2 | L: P 0.56; βZn3P2: P 0.4; αZnP2: P 0.666 | model | [2] Ghasemi 2019 | Table 4, p. 6, row 21; `ORC-5FZG5XPQ3X` |  |
| 1255.15 | eutectic: L -> βZn3P2 + αZnP2 | L: P 0.56; βZn3P2: P 0.4; αZnP2: P 0.666 | model | [2] Ghasemi 2019 | Table 4, p. 6, row 23; `ORC-L6TQJF5OOW` |  |
| 1253.15 | eutectic: L -> βZn3P2 + αZnP2 | L: P 0.55; βZn3P2: P 0.4; αZnP2: P 0.666 | experimental | [2] Ghasemi 2019; _cites Berak 1969_ | Table 4, p. 6, row 19; `ORC-BO6LTQWKJF` |  |
| 1253.15 | eutectic: L -> ZnP2 + Zn3P2 | L: P 0.0055; ZnP2: P 0.666667; Zn3P2: P 0.4 | experimental | [1] Liu 2016; _cites Dutkiewlcz 1991_ [doi](https://doi.org/10.1007/bf02645963) | Table 5, p. 6, row 10; `ORC-L46VR7ZA2V` |  |
| 1223.15 | eutectic: L -> βZn3P2 + αZnP2 | βZn3P2: P 0.4; αZnP2: P 0.666667 | experimental | [2] Ghasemi 2019; _cites Schneider 1973_ | Table 4, p. 6, row 20; `ORC-B2WW45SSL5` |  |
| 692.3 | eutectic: L -> (Zn) + αZn3P2 | L: P 7.000e-4; (Zn): P 0; αZn3P2: P 0.4 | model | [2] Ghasemi 2019 | Table 4, p. 6, row 5; `ORC-2V3ZOULXYR` |  |
| 692.15 | eutectic: L -> (Zn) + αZn3P2 | L: P 0.0066; (Zn): P 0; αZn3P2: P 0.4 | experimental | [2] Ghasemi 2019; _cites Berak 1969_ | Table 4, p. 6, row 2; `ORC-SCRFRWHFTM` |  |
| 690.9 | eutectic: L -> (Zn) + αZn3P2 | L: P 0.0034; (Zn): P 0; αZn3P2: P 0.4 | model | [2] Ghasemi 2019 | Table 4, p. 6, row 4; `ORC-OGUVAMLDYQ` |  |
| 690.8 | eutectic: L -> (Zn) + αZn3P2 | L: P 0.0036; (Zn): P 0; αZn3P2: P 0.4 | model | [2] Ghasemi 2019 | Table 4, p. 6, row 6; `ORC-AM76RT63JV` |  |
| 689.15 | eutectic: L -> (Zn) + Zn3P2 | L: P 6.400e-4; (Zn): P 0; Zn3P2: P 0.4 | unspecified | [1] Liu 2016; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 5, p. 6, row 3; `ORC-VHAQBQMKDU` |  |
| 689.15 | eutectic: L -> (Zn) + Zn3P2 | L: P 6.600e-4; (Zn): P 0; Zn3P2: P 0.4 | experimental | [1] Liu 2016; _cites Dutkiewlcz 1991_ [doi](https://doi.org/10.1007/bf02645963) | Table 5, p. 6, row 4; `ORC-XKHPV3VJQK` |  |
| 689.15 | eutectic: L -> (Zn) + αZn3P2 | L: P 0.0066; (Zn): P 0; αZn3P2: P 0.4 | experimental | [2] Ghasemi 2019; _cites Schneider 1973_ | Table 4, p. 6, row 1; `ORC-ZXLXV34Z3K` |  |
| 686.15 | eutectic: L -> (Zn) + Zn3P2 | L: P 0.025; (Zn): P 0; Zn3P2: P 0.4 | experimental | [1] Liu 2016; _cites Ugay 1968_ | Table 5, p. 6, row 2; `ORC-O5NJUTUAGR` |  |
| 685.35 | eutectic: L -> (Zn) + Zn3P2 | L: P 0.00907; (Zn): P 0; Zn3P2: P 0.4 | unspecified | [1] Liu 2016 | Table 5, p. 6, row 1; `ORC-OBFDWKFRZF` |  |
| 674.15 | eutectic: L -> (Zn) + αZn3P2 | L: P 0.025; (Zn): P 0; αZn3P2: P 0.4 | experimental | [2] Ghasemi 2019; _cites Ugai 1968_ | Table 4, p. 6, row 3; `ORC-IAWNKM5ZAV` |  |

## 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–Zn system (20)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Zn3P2 |  | -181.78 kJ/mol (basis unstated) | 298.15 | model |  |  | [2] Ghasemi 2019; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 2, p. 3, row 2; `ORC-5QGOL6UF5I.bc2a85` |  |
| Zn3P2 |  | -151.839 kJ/mol (basis unstated) | 298.15 | model |  |  | [2] Ghasemi 2019; _cites Liu 2016_ [doi](https://doi.org/10.1016/j.surfcoat.2016.01.016) | Table 2, p. 3, row 1; `ORC-YVXEYCTMZN.2d2913` |  |
| Zn3P2 | [Zn3P2](https://data.orchid-project.org/compounds/Zn3P2.html) | -46.06 kJ/mol-atom ± 6300 | 298.15 | experimental | -18.169 (mp-aaaaadbr) | -27.768 (oqmd-14030) | [1] Liu 2016; _cites Karvelis 1959_ | Table 4, p. 6, row 4; `ORC-6G5UCN3PYT` |  |
| Zn3P2 | [Zn3P2](https://data.orchid-project.org/compounds/Zn3P2.html) | -46.06 kJ/mol-atom ± 1.26 | 298.15 | experimental | -18.169 (mp-aaaaadbr) | -27.768 (oqmd-14030) | [3] Tu 2009; _cites Karvelis 1959_ | Table 3, p. 4, row 8; `ORC-MWD4MEQCQL` |  |
| Zn3P2 | [Zn3P2](https://data.orchid-project.org/compounds/Zn3P2.html) | -44.66 kJ/mol-atom ± 1500 | 298.15 | unspecified | -18.169 (mp-aaaaadbr) | -27.768 (oqmd-14030) | [1] Liu 2016; _cites Karvelis 1959_ | Table 4, p. 6, row 5; `ORC-H6HJEGQSCS` |  |
| Zn3P2 | [Zn3P2](https://data.orchid-project.org/compounds/Zn3P2.html) | -44.66 kJ/mol-atom ± 0.3 | 298.15 | experimental | -18.169 (mp-aaaaadbr) | -27.768 (oqmd-14030) | [3] Tu 2009; _cites Karvelis 1959_ | Table 3, p. 4, row 9; `ORC-NFWOS5535K` |  |
| Zn3P2 | [Zn3P2](https://data.orchid-project.org/compounds/Zn3P2.html) | -36.356 kJ/mol-atom | 298.15 | model | -18.169 (mp-aaaaadbr) | -27.768 (oqmd-14030) | [3] Tu 2009 | Table 3, p. 4, row 10; `ORC-4NHSU4IPIC.488e37` |  |
| Zn3P2 | [Zn3P2](https://data.orchid-project.org/compounds/Zn3P2.html) | -36.356 kJ/mol-atom | 298.15 | model | -18.169 (mp-aaaaadbr) | -27.768 (oqmd-14030) | [1] Liu 2016; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 4, p. 6, row 6; `ORC-V67L7I2OM7.4baa15` |  |
| Zn3P2 | [Zn3P2](https://data.orchid-project.org/compounds/Zn3P2.html) | -34.64 kJ/mol-atom ± 10400 | 298.15 | unspecified | -18.169 (mp-aaaaadbr) | -27.768 (oqmd-14030) | [1] Liu 2016; _cites Sirota 2016_ | Table 4, p. 6, row 2; `ORC-7KX4AFY722.74dbf0` |  |
| Zn3P2 | [Zn3P2](https://data.orchid-project.org/compounds/Zn3P2.html) | -34.64 kJ/mol-atom ± 2.08 | 298.15 | experimental | -18.169 (mp-aaaaadbr) | -27.768 (oqmd-14030) | [3] Tu 2009; _cites Sirota 1975_ | Table 3, p. 4, row 6; `ORC-LWXR2TG7QI.334c1f` |  |
| Zn3P2 | [Zn3P2](https://data.orchid-project.org/compounds/Zn3P2.html) | -33.06 kJ/mol-atom ± 4.18 | 298.15 | experimental | -18.169 (mp-aaaaadbr) | -27.768 (oqmd-14030) | [3] Tu 2009; _cites Schoonmaker 1967_ [doi](https://doi.org/10.1021/j100867a043) | Table 3, p. 4, row 7; `ORC-3W2FGGUKTH` |  |
| Zn3P2 | [Zn3P2](https://data.orchid-project.org/compounds/Zn3P2.html) | -33.06 kJ/mol-atom ± 20900 | 298.15 | experimental | -18.169 (mp-aaaaadbr) | -27.768 (oqmd-14030) | [1] Liu 2016; _cites Schoonmaker 1967_ [doi](https://doi.org/10.1021/j100867a043) | Table 4, p. 6, row 3; `ORC-CIWTGTH2YD` |  |
| Zn3P2 | [Zn3P2](https://data.orchid-project.org/compounds/Zn3P2.html) | -30.3678 kJ/mol-atom | 298.15 | model | -18.169 (mp-aaaaadbr) | -27.768 (oqmd-14030) | [1] Liu 2016 | Table 4, p. 6, row 1; `ORC-24MG5TAEG6.73186d` |  |
| ZnP2 |  | -127.4 kJ/mol (basis unstated) ± 7.5 | 298.15 | unspecified |  |  | [1] Liu 2016; _cites Sirota 2016_ | Table 4, p. 6, row 8; `ORC-JYRTJOGZSD.e1dffe` |  |
| ZnP2 |  | -126.85 kJ/mol (basis unstated) | 298.15 | model |  |  | [2] Ghasemi 2019; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 2, p. 3, row 12; `ORC-ESKOWRUNAQ.709e33` |  |
| ZnP2 |  | -126.85 kJ/mol (basis unstated) | 298.15 | model |  |  | [1] Liu 2016; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 4, p. 6, row 9; `ORC-RLYENHSAFJ.3d5e89` |  |
| ZnP2 |  | -92.9282 kJ/mol (basis unstated) | 298.15 | model |  |  | [2] Ghasemi 2019; _cites Liu 2016_ [doi](https://doi.org/10.1016/j.surfcoat.2016.01.016) | Table 2, p. 3, row 11; `ORC-7KEWLE76DK.bca2c5` |  |
| ZnP2 |  | -92.9282 kJ/mol (basis unstated) | 298.15 | model |  |  | [1] Liu 2016 | Table 4, p. 6, row 7; `ORC-X6TLIXEJC7.7cb926` |  |
| ZnP2 | [ZnP2](https://data.orchid-project.org/compounds/ZnP2.html) | -42.4667 kJ/mol-atom ± 2.5 | 298.15 | experimental | -23.975 (mp-aaaaaqib) | -40.016 (oqmd-31359) | [3] Tu 2009; _cites Sirota 1975_ | Table 3, p. 4, row 11; `ORC-4SHUHIJJW6.377490` |  |
| ZnP2 | [ZnP2](https://data.orchid-project.org/compounds/ZnP2.html) | -42.2833 kJ/mol-atom | 298.15 | model | -23.975 (mp-aaaaaqib) | -40.016 (oqmd-31359) | [3] Tu 2009 | Table 3, p. 4, row 12; `ORC-VFY4NS7T2I.e4abf5` |  |

## Other properties

### Phase transition (25)

Table: Phase transition, P–Zn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1113.15 K | 1113.15 | congruent melting: L -> βZn3P2; _L: P 0.4; βZn3P2: P 0.4_ | experimental | [2] Ghasemi 2019; _cites Ugai 1968_ | Table 4, p. 6, row 15; `ORC-IBPYZBIGYK` |  |
| Phase transition | 1118.15 K | 1118.15 | polymorphic: αZn3P2 -> βZn3P2; _αZn3P2: P 0.4; βZn3P2: P 0.4_ | experimental | [2] Ghasemi 2019; _cites Pistorius 1977_ | Table 4, p. 6, row 8; `ORC-XGOCL4GYNI` |  |
| Phase transition | 1123.15 K | 1123.15 | polymorphic: αZn3P2 -> βZn3P2; _αZn3P2: P 0.4; βZn3P2: P 0.4_ | experimental | [2] Ghasemi 2019; _cites Schneider 1973_ | Table 4, p. 6, row 7; `ORC-GTLLG6A3IR` |  |
| Phase transition | 1123.15 K | 1123.15 | polymorphic: αZn3P2 -> βZn3P2; _αZn3P2: P 0.4; βZn3P2: P 0.4_ | model | [2] Ghasemi 2019 | Table 4, p. 6, row 11; `ORC-JNYOUFZYMX.38acb1` |  |
| Phase transition | 1153.15 K | 1153.15 | polymorphic: αZn3P2 -> βZn3P2; _αZn3P2: P 0.4; βZn3P2: P 0.4_ | experimental | [2] Ghasemi 2019; _cites Berak 1969_ | Table 4, p. 6, row 9; `ORC-WUJJT5243Q` |  |
| Phase transition | 1261.15 K | 1261.15 | polymorphic: αZnP2 -> βZnP2; _αZnP2: P 0.666667; βZnP2: P 0.666667_ | model | [2] Ghasemi 2019 | Table 4, p. 6, row 26; `ORC-ACGSJZXKHZ` |  |
| Phase transition | 1263.15 K | 1263.15 | polymorphic: αZnP2 -> βZnP2; _αZnP2: P 0.666; βZnP2: P 0.666667_ | experimental | [2] Ghasemi 2019; _cites Berak 1969_ | Table 4, p. 6, row 24; `ORC-K43AVFS6WB` |  |
| Phase transition | 1263.15 K | 1263.15 | polymorphic: αZnP2 -> βZnP2; _αZnP2: P 0.666667; βZnP2: P 0.666667_ | model | [2] Ghasemi 2019 | Table 4, p. 6, row 25; `ORC-WRTZW4POX3.7b4950` |  |
| Phase transition | 1307.15 K | 1307.15 | congruent melting: L -> ZnP2; _L: P 0.00667; ZnP2: P 0.666667_ | unspecified | [1] Liu 2016; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 5, p. 6, row 12; `ORC-HVCN7YAVZ6` |  |
| Phase transition | 1311.15 K | 1311.15 | congruent melting: L -> βZnP2; _L: P 0.666667; βZnP2: P 0.666667_ | model | [2] Ghasemi 2019 | Table 4, p. 6, row 30; `ORC-YC5SEWQGAQ` |  |
| Phase transition | 1311.55 K | 1311.55 | congruent melting: L -> ZnP2; _L: P 0.00667; ZnP2: P 0.666667_ | unspecified | [1] Liu 2016 | Table 5, p. 6, row 11; `ORC-LFVTWBMQZ5` |  |
| Phase transition | 1312.15 K | 1312.15 | congruent melting: L -> βZnP2; _L: P 0.666667; βZnP2: P 0.666667_ | model | [2] Ghasemi 2019 | Table 4, p. 6, row 29; `ORC-Z6I3GXOMCN` |  |
| Phase transition | 1313.15 K | 1313.15 | congruent melting: L -> ZnP2; _L: P 0.00667; ZnP2: P 0.666667_ | experimental | [1] Liu 2016; _cites Dutkiewlcz 1991_ [doi](https://doi.org/10.1007/bf02645963) | Table 5, p. 6, row 13; `ORC-QI4IAEF4LY` |  |
| Phase transition | 1313.15 K | 1313.15 | congruent melting: L -> βZnP2; _L: P 0.666; βZnP2: P 0.666_ | experimental | [2] Ghasemi 2019; _cites Berak 1969_ | Table 4, p. 6, row 28; `ORC-XHYKPYHTYS` |  |
| Phase transition | 1313.15 K | 1313.15 | congruent melting: L -> βZnP2; _L: P 0.666667; βZnP2: P 0.666667_ | model | [2] Ghasemi 2019 | Table 4, p. 6, row 31; `ORC-YYRJ2BOT42` |  |
| Phase transition | 1313.15 K | 1313.15 | βZnP2 + liquid | experimental | [2] Ghasemi 2019; _cites Berak 1969_ | p. 3; `ORC-57BHKU3KY2.9c7950` | “Furthermore, βZnP2 melts at 1040 ∘ C and undergoes the α → β transformation at 990 ∘ C as reported by Berak and Pruchnik \[35\].” |
| Phase transition | 1433.15 K | 1433.15 | congruent melting: L -> βZn3P2; _L: P 0.4; βZn3P2: P 0.4_ | experimental | [2] Ghasemi 2019; _cites Schneider 1973_ | Table 4, p. 6, row 13; `ORC-YXHAVLOBHQ` |  |
| Phase transition | 1433.15 K | 1433.15 | βZn3P2 + liquid | experimental | [2] Ghasemi 2019; _cites Schneider 1973_ | p. 2; `ORC-P5CTS5K3KL.ad95e2` | “The α → β transformation of this phase occurs at 850 ∘ C, while the melting of βZn3 P2 occurs at 1160 ∘ C and according to Schneider and Krumnacker \[36\].” |
| Phase transition | 1436.15 K | 1436.15 | congruent melting: L -> βZn3P2; _L: P 0.4; βZn3P2: P 0.4_ | model | [2] Ghasemi 2019 | Table 4, p. 6, row 18; `ORC-HH4W5H77OI` |  |
| Phase transition | 1437.15 K | 1437.15 | congruent melting: L -> βZn3P2; _L: P 0.4; βZn3P2: P 0.4_ | model | [2] Ghasemi 2019 | Table 4, p. 6, row 16; `ORC-5Z7TJ2WUZ4` |  |
| Phase transition | 1438.15 K | 1438.15 | congruent melting: L -> βZn3P2; _L: P 0.4; βZn3P2: P 0.4_ | model | [2] Ghasemi 2019 | Table 4, p. 6, row 17; `ORC-HXTUDJ7IGQ` |  |
| Phase transition | 1443.15 K | 1443.15 | congruent melting: L -> Zn3P2; _L: P 0.004; Zn3P2: P 0.4_ | unspecified | [1] Liu 2016; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 5, p. 6, row 6; `ORC-FUB5RXIZQM` |  |
| Phase transition | 1446.15 K | 1446.15 | congruent melting: L -> Zn3P2; _L: P 0.004; Zn3P2: P 0.4_ | experimental | [1] Liu 2016; _cites Dutkiewlcz 1991_ [doi](https://doi.org/10.1007/bf02645963) | Table 5, p. 6, row 7; `ORC-IAOP2J2474` |  |
| Phase transition | 1448.15 K | 1448.15 | congruent melting: L -> Zn3P2; _L: P 0.004; Zn3P2: P 0.4_ | unspecified | [1] Liu 2016 | Table 5, p. 6, row 5; `ORC-BBYMOWOY75` |  |
| Phase transition | 1466.15 K | 1466.15 | congruent melting: L -> βZn3P2; _L: P 0.4; βZn3P2: P 0.4_ | experimental | [2] Ghasemi 2019; _cites Berak 1969_ | Table 4, p. 6, row 14; `ORC-4BOLKZ3DV4` |  |

### Formation (14)

Table: Formation, P–Zn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Gibbs energy of formation; _printed: ΔfG298_ | -31.7414 kJ/mol-atom | 298.15 | Zn3P2; _alloy: Zn 0.6_ | model | [1] Liu 2016 | Table 4, p. 6, row 1; `ORC-24MG5TAEG6.fe12a0` |  |
| Gibbs energy of formation; _printed: ΔfG298_ | -33.762 kJ/mol-atom | 298.15 | Zn3P2; _alloy: P 0.4, Zn 0.6_ | model | [3] Tu 2009 | Table 3, p. 4, row 10; `ORC-4NHSU4IPIC.cb129b` |  |
| Gibbs energy of formation; _printed: ΔfG°298_ | -168.81 kJ/mol (basis unstated) | 298.15 | Zn3P2; _alloy: Zn 0.6_ | model | [2] Ghasemi 2019; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 2, p. 3, row 2; `ORC-5QGOL6UF5I.edb5a0` |  |
| Gibbs energy of formation; _printed: ΔfG298_ | -36.02 kJ/mol-atom ± 13000 | 298.15 | Zn3P2; _alloy: Zn 0.6_ | unspecified | [1] Liu 2016; _cites Sirota 2016_ | Table 4, p. 6, row 2; `ORC-7KX4AFY722.349486` |  |
| Gibbs energy of formation; _printed: ΔfG298_ | -36.02 kJ/mol-atom ± 2.6 | 298.15 | Zn3P2; _alloy: P 0.4, Zn 0.6_ | experimental | [3] Tu 2009; _cites Sirota 1975_ | Table 3, p. 4, row 6; `ORC-LWXR2TG7QI.ce2112` |  |
| Gibbs energy of formation; _printed: ΔfG298_ | -33.762 kJ/mol-atom | 298.15 | Zn3P2; _alloy: Zn 0.6_ | model | [1] Liu 2016; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 4, p. 6, row 6; `ORC-V67L7I2OM7.6366f7` |  |
| Gibbs energy of formation; _printed: ΔfG°298_ | -158.707 kJ/mol (basis unstated) | 298.15 | Zn3P2; _alloy: Zn 0.6_ | model | [2] Ghasemi 2019; _cites Liu 2016_ [doi](https://doi.org/10.1016/j.surfcoat.2016.01.016) | Table 2, p. 3, row 1; `ORC-YVXEYCTMZN.d7d49c` |  |
| Gibbs energy of formation; _printed: ΔfG298_ | -40.9667 kJ/mol-atom ± 1.83333 | 298.15 | ZnP2; _alloy: P 0.666667, Zn 0.333333_ | experimental | [3] Tu 2009; _cites Sirota 1975_ | Table 3, p. 4, row 11; `ORC-4SHUHIJJW6.9698a3` |  |
| Gibbs energy of formation; _printed: ΔfG°298_ | -118.032 kJ/mol (basis unstated) | 298.15 | ZnP2; _alloy: Zn 0.333333_ | model | [2] Ghasemi 2019; _cites Liu 2016_ [doi](https://doi.org/10.1016/j.surfcoat.2016.01.016) | Table 2, p. 3, row 11; `ORC-7KEWLE76DK.8b7c6b` |  |
| Gibbs energy of formation; _printed: ΔfG°298_ | -126.2 kJ/mol (basis unstated) | 298.15 | ZnP2; _alloy: Zn 0.333333_ | model | [2] Ghasemi 2019; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 2, p. 3, row 12; `ORC-ESKOWRUNAQ.b934c3` |  |
| Gibbs energy of formation; _printed: ΔfG298_ | -122.9 kJ/mol (basis unstated) ± 5.5 | 298.15 | ZnP2; _alloy: Zn 0.333333_ | unspecified | [1] Liu 2016; _cites Sirota 2016_ | Table 4, p. 6, row 8; `ORC-JYRTJOGZSD.3fb416` |  |
| Gibbs energy of formation; _printed: ΔfG298_ | -126.2 kJ/mol (basis unstated) | 298.15 | ZnP2; _alloy: Zn 0.333333_ | model | [1] Liu 2016; _cites Tu 2009_ [doi](https://doi.org/10.1016/j.calphad.2009.10.003) | Table 4, p. 6, row 9; `ORC-RLYENHSAFJ.441e28` |  |
| Gibbs energy of formation; _printed: ΔfG298_ | -42.0667 kJ/mol-atom | 298.15 | ZnP2; _alloy: P 0.666667, Zn 0.333333_ | model | [3] Tu 2009 | Table 3, p. 4, row 12; `ORC-VFY4NS7T2I.e39cad` |  |
| Gibbs energy of formation; _printed: ΔfG298_ | -118.032 kJ/mol (basis unstated) | 298.15 | ZnP2; _alloy: Zn 0.333333_ | model | [1] Liu 2016 | Table 4, p. 6, row 7; `ORC-X6TLIXEJC7.77f890` |  |

### Crystal structure (8)

Table: Crystal structure, P–Zn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 5.08 Å |  | β-Zn3P2; _alloy: Zn 0.6_ | experimental | [1] Liu 2016; _cites Berak 1969_ | Table 1, p. 3, row 6; `ORC-JEVDUV3HP7` |  |
| Lattice a | 8.85 Å |  | β-ZnP2; _alloy: Zn 0.333333_ | experimental | [1] Liu 2016; _cites Hegyi 1963_ [doi](https://doi.org/10.1016/0022-3697%2863%2990140-9) | Table 1, p. 3, row 5; `ORC-GFRRKXFSNY.a1608e` |  |
| Lattice a | 8.089 Å | 298.15 | α-Zn3P2; _alloy: Zn 0.6_ | experimental | [1] Liu 2016; _cites Pistorius 1977_ | Table 1, p. 3, row 4; `ORC-2FA6G6IUNH.5d5753` |  |
| Lattice a | 5.08 Å | 298.15 | α-ZnP2; _alloy: Zn 0.333333_ | experimental | [1] Liu 2016; _cites Hegyi 1963_ [doi](https://doi.org/10.1016/0022-3697%2863%2990140-9) | Table 1, p. 3, row 3; `ORC-LE6LIBHV3D.fb0a74` |  |
| Lattice b | 7.29 Å |  | β-ZnP2; _alloy: Zn 0.333333_ | experimental | [1] Liu 2016; _cites Hegyi 1963_ [doi](https://doi.org/10.1016/0022-3697%2863%2990140-9) | Table 1, p. 3, row 5; `ORC-GFRRKXFSNY.40c2df` |  |
| Lattice c | 7.56 Å |  | β-ZnP2; _alloy: Zn 0.333333_ | experimental | [1] Liu 2016; _cites Hegyi 1963_ [doi](https://doi.org/10.1016/0022-3697%2863%2990140-9) | Table 1, p. 3, row 5; `ORC-GFRRKXFSNY.9bf1c5` |  |
| Lattice c | 11.407 Å | 298.15 | α-Zn3P2; _alloy: Zn 0.6_ | experimental | [1] Liu 2016; _cites Pistorius 1977_ | Table 1, p. 3, row 4; `ORC-2FA6G6IUNH.186670` |  |
| Lattice c | 18.59 Å | 298.15 | α-ZnP2; _alloy: Zn 0.333333_ | experimental | [1] Liu 2016; _cites Hegyi 1963_ [doi](https://doi.org/10.1016/0022-3697%2863%2990140-9) | Table 1, p. 3, row 3; `ORC-LE6LIBHV3D.b341cb` |  |

## Sources

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

1. 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)
2. Masoomeh Ghasemi, E. Stutz, S. Escobar Steinvall, M. Zamani, A. Fontcuberta i Morral, Thermodynamic re-assessment of the Zn–P binary system, Materialia 6, 100301 (2019). [doi:10.1016/j.mtla.2019.100301](https://doi.org/10.1016/j.mtla.2019.100301)
3. Hao Tu, Fucheng Yin, Xuping Su, Ya Liu, Xinming Wang, Experimental investigation and thermodynamic modeling of the Al–P–Zn ternary system, Calphad 33, 755-760 (2009). [doi:10.1016/j.calphad.2009.10.003](https://doi.org/10.1016/j.calphad.2009.10.003)

## 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/).