# Ga–Se system

> Ga–Se system: 100 accepted literature values (invariant reaction 58, heat capacity / entropy / enthalpy 26, formation 16) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/GA-SE.html · Markdown: https://data.orchid-project.org/systems/GA-SE.md

100 accepted literature values from 1 paper(s) (experimental 73, model 27); 0 calculated phase diagram(s).

Data: [JSON](https://data.orchid-project.org/literature/systems/GA-SE.json) · [CSV](https://data.orchid-project.org/systems/GA-SE.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#GA-SE) · [phases (9)](https://data.orchid-project.org/phases/pages/GA-SE.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/GA-SE.html) · [Markdown](https://data.orchid-project.org/systems/GA-SE.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 73 |
| model | 27 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 58 |
| formation | 16 |
| heat capacity / entropy / enthalpy | 26 |

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

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Ga–Se system (58)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1293 | congruent melting: α-Ga2Se3 -> L | α-Ga2Se3: Se 0.6; L: Se 0.6 | experimental | [1] Zheng 2008; _cites Klemm 1934_ [doi](https://doi.org/10.1002/zaac.19342190106) | Table 2, p. 5, row 32; `ORC-2W3YNWTTX4` |  |
| 1293 | congruent melting: α-Ga2Se3 -> L | α-Ga2Se3: Se 0.6; L: Se 0.6 | experimental | [1] Zheng 2008; _cites Rustamov 1965_ | Table 2, p. 5, row 34; `ORC-5R6XU3M6BP` |  |
| 1291 | congruent melting: α-Ga2Se3 -> L | α-Ga2Se3: Se 0.606; L: Se 0.606 | experimental | [1] Zheng 2008; _cites Shtanov 1998_ | Table 2, p. 5, row 41; `ORC-TBJK4C3OGD` |  |
| 1283 | congruent melting: α-Ga2Se3 -> L | α-Ga2Se3: Se 0.6004; L: Se 0.599 | model | [1] Zheng 2008 | Table 2, p. 5, row 42; `ORC-2TC52SIPW3` |  |
| 1283 | congruent melting: α-Ga2Se3 -> L | α-Ga2Se3: Se 0.6; L: Se 0.6 | experimental | [1] Zheng 2008; _cites Palatnik 1965_ | Table 2, p. 5, row 33; `ORC-4TPJBCQOJ6` |  |
| 1283 | congruent melting: α-Ga2Se3 -> L | α-Ga2Se3: Se 0.6; L: Se 0.6 | experimental | [1] Zheng 2008; _cites Mikkelsen 1981_ [doi](https://doi.org/10.1016/0022-4596%2881%2990397-2) | Table 2, p. 5, row 39; `ORC-6BYPNY2QLH` |  |
| 1283 | congruent melting: α-Ga2Se3 -> L | α-Ga2Se3: Se 0.6; L: Se 0.6 | experimental | [1] Zheng 2008; _cites Ollitraut-Fichet 1980_ | Table 2, p. 5, row 38; `ORC-OOIRQOJFJV` |  |
| 1283 | congruent melting: α-Ga2Se3 -> L | α-Ga2Se3: Se 0.6; L: Se 0.6 | experimental | [1] Zheng 2008; _cites Palatnik 1966_ | Table 2, p. 5, row 35; `ORC-RPCXHT72C5` |  |
| 1283 | congruent melting: α-Ga2Se3 -> L | α-Ga2Se3: Se 0.6; L: Se 0.6 | experimental | [1] Zheng 2008; _cites Dieleman 1971_ [doi](https://doi.org/10.1016/0022-5088%2871%2990135-4) | Table 2, p. 5, row 36; `ORC-YRJDO55TF3` |  |
| 1280 | congruent melting: α-Ga2Se3 -> L | α-Ga2Se3: Se 0.6; L: Se 0.6 | experimental | [1] Zheng 2008; _cites Dieleman 1982_ | Table 2, p. 5, row 40; `ORC-22GWA25GZ6` |  |
| 1280 | critical point: L -> L1 + L2 | L: Se 0.253 | model | [1] Zheng 2008 | Table 2, p. 5, row 4; `ORC-6UD77HYVP4` |  |
| 1279 | critical point: L -> L1 + L2 | L: Se 0.243 | experimental | [1] Zheng 2008; _cites Ollitraut-Fichet 1980_ | Table 2, p. 5, row 2; `ORC-KAX7ZGOIC5` |  |
| 1278 | congruent melting: α-Ga2Se3 -> L | α-Ga2Se3: Se 0.6; L: Se 0.6 | experimental | [1] Zheng 2008; _cites Suzuki 1974_ [doi](https://doi.org/10.1143/jjap.13.417) | Table 2, p. 5, row 37; `ORC-4DFL4AFLDA` |  |
| 1268 | critical point: L -> L1 + L2 | L: Se 0.23 | experimental | [1] Zheng 2008; _cites Suzuki 1974_ [doi](https://doi.org/10.1143/jjap.13.417) | Table 2, p. 5, row 1; `ORC-TS6B5WMELK` |  |
| 1267 | critical point: L -> L1 + L2 | L: Se 0.24 | experimental | [1] Zheng 2008; _cites Dieleman 1982_ | Table 2, p. 5, row 3; `ORC-3GONPEE7VQ` |  |
| 1233 | congruent melting: GaSe -> L | GaSe: Se 0.5; L: Se 0.5 | experimental | [1] Zheng 2008; _cites Rustamov 1965_ | Table 2, p. 5, row 16; `ORC-GAPJYWZCC5` |  |
| 1233 | congruent melting: GaSe -> L | GaSe: Se 0.5; L: Se 0.5 | experimental | [1] Zheng 2008; _cites Klemm 1934_ [doi](https://doi.org/10.1002/zaac.19342190106) | Table 2, p. 5, row 15; `ORC-VXW2MOAMVE` |  |
| 1223 | congruent melting: GaSe -> L | GaSe: Se 0.5; L: Se 0.5 | experimental | [1] Zheng 2008; _cites Palatnik 1966_ | Table 2, p. 5, row 17; `ORC-SA6CXA5WBJ` |  |
| 1218 | congruent melting: GaSe -> L | GaSe: Se 0.5; L: Se 0.5 | experimental | [1] Zheng 2008; _cites Ollitraut-Fichet 1980_ | Table 2, p. 5, row 20; `ORC-6CTHZZGKFM` |  |
| 1211 | congruent melting: GaSe -> L | GaSe: Se 0.5; L: Se 0.5 | experimental | [1] Zheng 2008; _cites Suzuki 1974_ [doi](https://doi.org/10.1143/jjap.13.417) | Table 2, p. 5, row 19; `ORC-BD6WCBKWXJ` |  |
| 1211 | congruent melting: GaSe -> L | GaSe: Se 0.5; L: Se 0.5 | experimental | [1] Zheng 2008; _cites Dieleman 1971_ [doi](https://doi.org/10.1016/0022-5088%2871%2990135-4) | Table 2, p. 5, row 18; `ORC-PZLYB7L7DW` |  |
| 1210 | congruent melting: GaSe -> L | GaSe: Se 0.5; L: Se 0.5 | model | [1] Zheng 2008 | Table 2, p. 5, row 23; `ORC-SFXOYOYHSV` |  |
| 1210 | congruent melting: GaSe -> L | GaSe: Se 0.482; L: Se 0.482 | experimental | [1] Zheng 2008; _cites Shtanov 1998_ | Table 2, p. 5, row 22; `ORC-SJ4LEH6DQS` |  |
| 1210 | congruent melting: GaSe -> L | GaSe: Se 0.5; L: Se 0.5 | experimental | [1] Zheng 2008; _cites Dieleman 1982_ | Table 2, p. 5, row 21; `ORC-Y2AOEJDD7I` |  |
| 1190 | monotectic: L1 + L2 -> GaSe | L1: Se 0.075; L2: Se 0.455; GaSe: Se 0.5 | experimental | [1] Zheng 2008; _cites Dieleman 1982_ | Table 2, p. 5, row 7; `ORC-3RFAFQW6HD` |  |
| 1188 | monotectic: L1 + L2 -> GaSe | L1: Se 0.055; L2: Se 0.44; GaSe: Se 0.5 | experimental | [1] Zheng 2008; _cites Suzuki 1974_ [doi](https://doi.org/10.1143/jjap.13.417) | Table 2, p. 5, row 5; `ORC-NVSYQYMPGO` |  |
| 1187 | monotectic: L1 + L2 -> GaSe | L1: Se 0.082; L2: Se 0.42; GaSe: Se 0.5 | experimental | [1] Zheng 2008; _cites Ollitraut-Fichet 1980_ | Table 2, p. 5, row 6; `ORC-GQ4LECYL6P` |  |
| 1185 | other: GaSe + α-Ga2Se3 -> L | GaSe: Se 0.5; α-Ga2Se3: Se 0.6; L: Se 0.55 | experimental | [1] Zheng 2008; _cites Rustamov 1965_ | Table 2, p. 5, row 24; `ORC-73JJAJ4GHZ` |  |
| 1185 | monotectic: L1 + L2 -> GaSe | L1: Se 0.078; L2: Se 0.412; GaSe: Se 0.5 | model | [1] Zheng 2008 | Table 2, p. 5, row 9; `ORC-DXQEKB76LQ` |  |
| 1185 | monotectic: L1 + L2 -> GaSe | GaSe: Se 0.48 | experimental | [1] Zheng 2008; _cites Shtanov 1998_ | Table 2, p. 5, row 8; `ORC-TGS4N26XWN` |  |
| 1163 | other: GaSe + α-Ga2Se3 -> L | GaSe: Se 0.5; α-Ga2Se3: Se 0.595; L: Se 0.554 | model | [1] Zheng 2008 | Table 2, p. 5, row 31; `ORC-FDDMB6DXYO` |  |
| 1163 | other: GaSe + α-Ga2Se3 -> L | GaSe: Se 0.5; α-Ga2Se3: Se 0.6; L: Se 0.55 | experimental | [1] Zheng 2008; _cites Ollitraut-Fichet 1980_ | Table 2, p. 5, row 28; `ORC-G2HOLTBMNQ` |  |
| 1162 | other: GaSe + α-Ga2Se3 -> L | GaSe: Se 0.5; α-Ga2Se3: Se 0.6; L: Se 0.551 | experimental | [1] Zheng 2008; _cites Dieleman 1982_ | Table 2, p. 5, row 29; `ORC-Q6ESABVTRI` |  |
| 1161 | other: GaSe + α-Ga2Se3 -> L | GaSe: Ga 0.5, Se 0.5; α-Ga2Se3: Ga 0.4, Se 0.6; L: Se 0.56 | experimental | [1] Zheng 2008; _cites Shtanov 1998_ | Table 2, p. 5, row 30; `ORC-G37YXBNR3D` |  |
| 1160 | other: GaSe + α-Ga2Se3 -> L | GaSe: Se 0.5; α-Ga2Se3: Se 0.594; L: Se 0.551 | experimental | [1] Zheng 2008; _cites Dieleman 1971_ [doi](https://doi.org/10.1016/0022-5088%2871%2990135-4) | Table 2, p. 5, row 26; `ORC-FJBI5D7BY3` |  |
| 1157 | other: GaSe + α-Ga2Se3 -> L | GaSe: Se 0.5; α-Ga2Se3: Se 0.6; L: Se 0.55 | experimental | [1] Zheng 2008; _cites Suzuki 1974_ [doi](https://doi.org/10.1143/jjap.13.417) | Table 2, p. 5, row 27; `ORC-6ZTGILVRQJ` |  |
| 1153 | other: GaSe + α-Ga2Se3 -> L | GaSe: Se 0.5; α-Ga2Se3: Se 0.5976; L: Se 0.554 | experimental | [1] Zheng 2008; _cites Palatnik 1966_ | Table 2, p. 5, row 25; `ORC-SAQ3QEOVW4` |  |
| 1004 | polymorphic: β-Ga2Se3 -> α-Ga2Se3 | β-Ga2Se3: Se 0.6; α-Ga2Se3: Se 0.6 | experimental | [1] Zheng 2008; _cites Muhsin 2003_ | Table 2, p. 5, row 49; `ORC-WQBCQAHIAK` |  |
| 1003 | polymorphic: β-Ga2Se3 -> α-Ga2Se3 | β-Ga2Se3: Se 0.6; α-Ga2Se3: Se 0.6 | experimental | [1] Zheng 2008; _cites Ollitraut-Fichet 1980_ | Table 2, p. 5, row 45; `ORC-CUZK5VP5HZ` |  |
| 1003 | polymorphic: β-Ga2Se3 -> α-Ga2Se3 | β-Ga2Se3: Se 0.6; α-Ga2Se3: Se 0.6 | experimental | [1] Zheng 2008; _cites Mikkelsen 1981_ [doi](https://doi.org/10.1016/0022-4596%2881%2990397-2) | Table 2, p. 5, row 46; `ORC-QZSQWXBVZD` |  |
| 994 | polymorphic: β-Ga2Se3 -> α-Ga2Se3 | β-Ga2Se3: Se 0.6; α-Ga2Se3: Se 0.6 | experimental | [1] Zheng 2008; _cites Muhsin 2003_ | Table 2, p. 5, row 48; `ORC-EZ53JWDKUZ` |  |
| 968 | polymorphic: β-Ga2Se3 -> α-Ga2Se3 | β-Ga2Se3: Se 0.605; α-Ga2Se3: Se 0.605 | experimental | [1] Zheng 2008; _cites Dieleman 1982_ | Table 2, p. 5, row 47; `ORC-DKTBUXKQHD` |  |
| 967 | polymorphic: β-Ga2Se3 -> α-Ga2Se3 | β-Ga2Se3: Se 0.6; α-Ga2Se3: Se 0.6 | model | [1] Zheng 2008 | Table 2, p. 5, row 50; `ORC-XYTDNUUF46` |  |
| 918 | peritectic: β-Ga2Se3 + α-Ga2Se3 -> L | β-Ga2Se3: Se 0.607; α-Ga2Se3: Se 0.61 | experimental | [1] Zheng 2008; _cites Dieleman 1982_ | Table 2, p. 5, row 51; `ORC-6QCKSU66RF` |  |
| 918 | peritectic: β-Ga2Se3 + α-Ga2Se3 -> L | β-Ga2Se3: Se 0.6; α-Ga2Se3: Se 0.61; L: Se 0.983 | model | [1] Zheng 2008 | Table 2, p. 5, row 52; `ORC-P4V2MX6FA6` |  |
| 898 | eutectoid: GaSe + α-Ga2Se3 -> β-Ga2Se3 | GaSe: Se 0.5; α-Ga2Se3: Se 0.599; β-Ga2Se3: Se 0.602 | experimental | [1] Zheng 2008; _cites Dieleman 1982_ | Table 2, p. 5, row 43; `ORC-2VHZA5SZFA` |  |
| 898 | eutectoid: GaSe + α-Ga2Se3 -> β-Ga2Se3 | GaSe: Se 0.5; α-Ga2Se3: Se 0.593; β-Ga2Se3: Se 0.6 | model | [1] Zheng 2008 | Table 2, p. 5, row 44; `ORC-GVKQSGRJJA` |  |
| 494 | other: β-Ga2Se3 + Se -> L | β-Ga2Se3: Se 0.6; Se: Se 1; L: Se 1 | model | [1] Zheng 2008 | Table 2, p. 5, row 58; `ORC-P6YIRNOAN2` |  |
| 493 | other: β-Ga2Se3 + Se -> L | β-Ga2Se3: Se 0.6; Se: Se 1; L: Se 1 | experimental | [1] Zheng 2008; _cites Suzuki 1974_ [doi](https://doi.org/10.1143/jjap.13.417) | Table 2, p. 5, row 55; `ORC-6QIKIDNUDZ` |  |
| 493 | other: β-Ga2Se3 + Se -> L | β-Ga2Se3: Se 0.6; Se: Se 1; L: Se 1 | experimental | [1] Zheng 2008; _cites Ollitraut-Fichet 1980_ | Table 2, p. 5, row 56; `ORC-LVMDNP6GUY` |  |
| 493 | other: β-Ga2Se3 + Se -> L | β-Ga2Se3: Se 0.6; Se: Se 1; L: Se 1 | experimental | [1] Zheng 2008; _cites Rustamov 1965_ | Table 2, p. 5, row 53; `ORC-SP46RIUF7M` |  |
| 493 | other: β-Ga2Se3 + Se -> L | β-Ga2Se3: Se 0.6; Se: Se 1; L: Se 1 | experimental | [1] Zheng 2008; _cites Dieleman 1982_ | Table 2, p. 5, row 57; `ORC-VDP4UDOWKM` |  |
| 478 | other: β-Ga2Se3 + Se -> L | β-Ga2Se3: Se 0.6024; Se: Se 1; L: Se 1 | experimental | [1] Zheng 2008; _cites Palatnik 1966_ | Table 2, p. 5, row 54; `ORC-7QUZQDNZKH` |  |
| 303 | other: Ga + GaSe -> L | Ga: Se 0; GaSe: Se 0.5; L: Se 0 | experimental | [1] Zheng 2008; _cites Dieleman 1982_ | Table 2, p. 5, row 13; `ORC-B3AIUL2ZAQ` |  |
| 303 | other: Ga + GaSe -> L | Ga: Se 0; GaSe: Se 0.5; L: Se 0 | experimental | [1] Zheng 2008; _cites Rustamov 1965_ | Table 2, p. 5, row 10; `ORC-B3USBQKT2V` |  |
| 303 | other: Ga + GaSe -> L | Ga: Se 0; GaSe: Se 0.5; L: Se 0 | experimental | [1] Zheng 2008; _cites Ollitraut-Fichet 1980_ | Table 2, p. 5, row 12; `ORC-FBYPGS3HWC` |  |
| 303 | other: Ga + GaSe -> L | Ga: Se 0; GaSe: Se 0.5; L: Se 0 | model | [1] Zheng 2008 | Table 2, p. 5, row 14; `ORC-MBC6S34VKD` |  |
| 303 | other: Ga + GaSe -> L | Ga: Se 0; GaSe: Se 0.5; L: Se 0 | experimental | [1] Zheng 2008; _cites Suzuki 1974_ [doi](https://doi.org/10.1143/jjap.13.417) | Table 2, p. 5, row 11; `ORC-REAE4AWAAD` |  |

## 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, Ga–Se system (16)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| GaSe | [GaSe](https://data.orchid-project.org/compounds/GaSe.html) | -79.496 kJ/mol-atom | 298.15 | model | -79.831 (mp-aaaaaqug) | -57.465 (oqmd-1971260) | [1] Zheng 2008; _cites Mills 1974_ | Table 3, p. 6, row 4; `ORC-KYW3ZXWNNQ` |  |
| GaSe | [GaSe](https://data.orchid-project.org/compounds/GaSe.html) | -79.496 kJ/mol-atom | 298.15 | experimental | -79.831 (mp-aaaaaqug) | -57.465 (oqmd-1971260) | [1] Zheng 2008; _cites Mamedov 1969_ | Table 3, p. 6, row 3; `ORC-QILHDNQTVK` |  |
| GaSe | [GaSe](https://data.orchid-project.org/compounds/GaSe.html) | -79.496 kJ/mol-atom | 298.15 | model | -79.831 (mp-aaaaaqug) | -57.465 (oqmd-1971260) | [1] Zheng 2008; _cites Barin 1995_ [doi](https://doi.org/10.1002/9783527619825) | Table 3, p. 6, row 5; `ORC-T25XSYXQBV` |  |
| GaSe | [GaSe](https://data.orchid-project.org/compounds/GaSe.html) | -78.9705 kJ/mol-atom | 298.15 | model | -79.831 (mp-aaaaaqug) | -57.465 (oqmd-1971260) | [1] Zheng 2008 | Table 3, p. 6, row 7; `ORC-SSWQUZC4AD` |  |
| GaSe | [GaSe](https://data.orchid-project.org/compounds/GaSe.html) | -78.85 kJ/mol-atom | 298.15 | experimental | -79.831 (mp-aaaaaqug) | -57.465 (oqmd-1971260) | [1] Zheng 2008; _cites Zavrazhnov 2003_ | Table 3, p. 6, row 6; `ORC-AT2UQJNLVR` |  |
| GaSe | [GaSe](https://data.orchid-project.org/compounds/GaSe.html) | -73.22 kJ/mol-atom | 298.15 | experimental | -79.831 (mp-aaaaaqug) | -57.465 (oqmd-1971260) | [1] Zheng 2008; _cites Hahn 1956_ [doi](https://doi.org/10.1002/ange.19560681616) | Table 3, p. 6, row 1; `ORC-ZIWLKHKB3S` |  |
| GaSe | [GaSe](https://data.orchid-project.org/compounds/GaSe.html) | -71.75 kJ/mol-atom | 298.15 | experimental | -79.831 (mp-aaaaaqug) | -57.465 (oqmd-1971260) | [1] Zheng 2008; _cites Kh 1968_ | Table 3, p. 6, row 2; `ORC-KVKMZPGWLJ` |  |
| β-Ga2Se3 | [Ga2Se3](https://data.orchid-project.org/compounds/Ga2Se3.html) | -92.048 kJ/mol-atom | 298.15 | experimental | -83.763 (mp-aaaaabzo) | -57.081 (oqmd-2169176) | [1] Zheng 2008; _cites Gadzhiev 1961_ | Table 3, p. 6, row 9; `ORC-NCIGGUNDYN` |  |
| β-Ga2Se3 | [Ga2Se3](https://data.orchid-project.org/compounds/Ga2Se3.html) | -87.864 kJ/mol-atom | 298.15 | experimental | -83.763 (mp-aaaaabzo) | -57.081 (oqmd-2169176) | [1] Zheng 2008; _cites Hahn 1956_ [doi](https://doi.org/10.1002/ange.19560681616) | Table 3, p. 6, row 8; `ORC-EUL3YE7EQG` |  |
| β-Ga2Se3 | [Ga2Se3](https://data.orchid-project.org/compounds/Ga2Se3.html) | -81.7554 kJ/mol-atom | 298.15 | experimental | -83.763 (mp-aaaaabzo) | -57.081 (oqmd-2169176) | [1] Zheng 2008; _cites Mamedov 1969_ | Table 3, p. 6, row 12; `ORC-DEDGCKX3D7.a196a2` |  |
| β-Ga2Se3 | [Ga2Se3](https://data.orchid-project.org/compounds/Ga2Se3.html) | -81.7554 kJ/mol-atom | 298.15 | model | -83.763 (mp-aaaaabzo) | -57.081 (oqmd-2169176) | [1] Zheng 2008; _cites Barin 1995_ [doi](https://doi.org/10.1002/9783527619825) | Table 3, p. 6, row 14; `ORC-J3QM73W5JA` |  |
| β-Ga2Se3 | [Ga2Se3](https://data.orchid-project.org/compounds/Ga2Se3.html) | -81.7554 kJ/mol-atom | 298.15 | model | -83.763 (mp-aaaaabzo) | -57.081 (oqmd-2169176) | [1] Zheng 2008; _cites Mills 1974_ | Table 3, p. 6, row 13; `ORC-QR4G3S4CQI` |  |
| β-Ga2Se3 | [Ga2Se3](https://data.orchid-project.org/compounds/Ga2Se3.html) | -81.002 kJ/mol-atom | 298.15 | experimental | -83.763 (mp-aaaaabzo) | -57.081 (oqmd-2169176) | [1] Zheng 2008; _cites Mamedov 1969_ | Table 3, p. 6, row 12; `ORC-DEDGCKX3D7.794e48` |  |
| β-Ga2Se3 | [Ga2Se3](https://data.orchid-project.org/compounds/Ga2Se3.html) | -79.7396 kJ/mol-atom | 298.15 | model | -83.763 (mp-aaaaabzo) | -57.081 (oqmd-2169176) | [1] Zheng 2008 | Table 3, p. 6, row 15; `ORC-2A6YM645CJ` |  |
| β-Ga2Se3 | [Ga2Se3](https://data.orchid-project.org/compounds/Ga2Se3.html) | -75.312 kJ/mol-atom | 298.15 | experimental | -83.763 (mp-aaaaabzo) | -57.081 (oqmd-2169176) | [1] Zheng 2008; _cites Effendiev 1965_ | Table 3, p. 6, row 10; `ORC-WIBUCVTZDJ` |  |
| β-Ga2Se3 | [Ga2Se3](https://data.orchid-project.org/compounds/Ga2Se3.html) | -73.722 kJ/mol-atom | 298.15 | experimental | -83.763 (mp-aaaaabzo) | -57.081 (oqmd-2169176) | [1] Zheng 2008; _cites Sharifov 1967_ | Table 3, p. 6, row 11; `ORC-V3ZAZTBCJT` |  |

## Other properties

### Heat capacity / entropy / enthalpy (26)

Table: Heat capacity / entropy / enthalpy, Ga–Se system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: S°298_ | 35.085 J/mol-atom/K | 298.15 | GaSe; _alloy: Se 0.5_ | model | [1] Zheng 2008 | Table 4, p. 6, row 9; `ORC-EASSMA3CO4` |  |
| Entropy; _printed: S°298_ | 35.145 J/mol-atom/K | 298.15 | GaSe; _alloy: Se 0.5_ | experimental | [1] Zheng 2008; _cites Mamedov 1967_ | Table 4, p. 6, row 1; `ORC-HG7LOTMMDU` |  |
| Entropy; _printed: S°298_ | 35.125 J/mol-atom/K | 298.15 | GaSe; _alloy: Se 0.5_ | experimental | [1] Zheng 2008; _cites Mamedov 1970_ | Table 4, p. 6, row 3; `ORC-I4YOLNDV4S` |  |
| Entropy; _printed: S°298_ | 35.115 J/mol-atom/K | 298.15 | GaSe; _alloy: Se 0.5_ | model | [1] Zheng 2008; _cites Rymkevich 1975_ | Table 4, p. 6, row 6; `ORC-I6FD76IVJ5` |  |
| Entropy; _printed: S°298_ | 35.085 J/mol-atom/K | 298.15 | GaSe; _alloy: Se 0.5_ | experimental | [1] Zheng 2008; _cites Tyurin 2004_ | Table 4, p. 6, row 8; `ORC-NYI2LSUD7M` |  |
| Entropy; _printed: S°298_ | 35.125 J/mol-atom/K | 298.15 | GaSe; _alloy: Se 0.5_ | experimental | [1] Zheng 2008; _cites Kerimov 1971_ | Table 4, p. 6, row 4; `ORC-O7KYJO5SNX` |  |
| Entropy; _printed: S°298_ | 34.45 J/mol-atom/K | 298.15 | GaSe; _alloy: Se 0.5_ | experimental | [1] Zheng 2008; _cites Abbasov 1969_ | Table 4, p. 6, row 2; `ORC-RHIBFFNDTR` |  |
| Entropy; _printed: S°298_ | 33.95 J/mol-atom/K | 298.15 | GaSe; _alloy: Se 0.5_ | experimental | [1] Zheng 2008; _cites Zavrazhnov 2003_ | Table 4, p. 6, row 7; `ORC-V3JJYGH5BO` |  |
| Entropy; _printed: S°298_ | 35.1455 J/mol-atom/K | 298.15 | GaSe; _alloy: Se 0.5_ | model | [1] Zheng 2008; _cites Mills 1974_ | Table 4, p. 6, row 5; `ORC-WWGTZTZ37R` |  |
| Entropy; _printed: S°298_ | 36.14 J/mol-atom/K | 298.15 | β-Ga2Se3; _alloy: Se 0.6_ | model | [1] Zheng 2008 | Table 4, p. 6, row 14; `ORC-5PDAEOAPD6` |  |
| Entropy; _printed: S°298_ | 36.652 J/mol-atom/K | 298.15 | β-Ga2Se3; _alloy: Se 0.6_ | experimental | [1] Zheng 2008; _cites Mamedov 1969_ | Table 4, p. 6, row 10; `ORC-6OSRGYMQDQ` |  |
| Entropy; _printed: S°298_ | 36.08 J/mol-atom/K | 298.15 | β-Ga2Se3; _alloy: Se 0.6_ | experimental | [1] Zheng 2008; _cites Tyurin 2005_ [doi](https://doi.org/10.1007/s10789-005-0275-x) | Table 4, p. 6, row 13; `ORC-MM6PA5TXHW` |  |
| Entropy; _printed: S°298_ | 35.9824 J/mol-atom/K | 298.15 | β-Ga2Se3; _alloy: Se 0.6_ | model | [1] Zheng 2008; _cites Mills 1974_ | Table 4, p. 6, row 11; `ORC-PRDCN57DMA` |  |
| Entropy; _printed: S°298_ | 35.9824 J/mol-atom/K | 298.15 | β-Ga2Se3; _alloy: Se 0.6_ | model | [1] Zheng 2008; _cites Barin 1995_ [doi](https://doi.org/10.1002/9783527619825) | Table 4, p. 6, row 12; `ORC-Z7Y4PFL7FA` |  |
| Heat capacity; _printed: Cp°298_ | 48.32 J/mol (basis unstated)/K | 298.15 | GaSe; _alloy: Se 0.5_ | experimental | [1] Zheng 2008; _cites Zavrazhnov 2004_ [doi](https://doi.org/10.1023/b:inma.0000016082.33860.43) | Table 5, p. 7, row 6; `ORC-3BNYLH7UYD` |  |
| Heat capacity; _printed: Cp°298_ | 47.89 J/mol (basis unstated)/K | 298.15 | GaSe; _alloy: Se 0.5_ | model | [1] Zheng 2008 | Table 5, p. 7, row 7; `ORC-5N6VTMJJDL` |  |
| Heat capacity; _printed: Cp°298_ | 48.49 J/mol (basis unstated)/K | 298.15 | GaSe; _alloy: Se 0.5_ | experimental | [1] Zheng 2008; _cites Mamedov 1967_ | Table 5, p. 7, row 1; `ORC-C2EL27XT4C` |  |
| Heat capacity; _printed: Cp°298_ | 47.79 J/mol (basis unstated)/K | 298.15 | GaSe; _alloy: Se 0.5_ | experimental | [1] Zheng 2008; _cites Okhotin 1998_ | Table 5, p. 7, row 4; `ORC-I3LAGKUMTI` |  |
| Heat capacity; _printed: Cp°298_ | 47.21 J/mol (basis unstated)/K | 298.15 | GaSe; _alloy: Se 0.5_ | model | [1] Zheng 2008; _cites Rymkevich 1975_ | Table 5, p. 7, row 3; `ORC-IIKPYNB7C3` |  |
| Heat capacity; _printed: Cp°298_ | 47.67 J/mol (basis unstated)/K | 298.15 | GaSe; _alloy: Se 0.5_ | experimental | [1] Zheng 2008; _cites Tyurin 2004_ | Table 5, p. 7, row 5; `ORC-OCS77LBXJM` |  |
| Heat capacity; _printed: Cp°298_ | 48.51 J/mol (basis unstated)/K | 298.15 | GaSe; _alloy: Se 0.5_ | model | [1] Zheng 2008; _cites Mills 1974_ | Table 5, p. 7, row 2; `ORC-ZG7GHED4DB` |  |
| Heat capacity; _printed: Cp°298_ | 115.8 J/mol (basis unstated)/K | 298.15 | β-Ga2Se3; _alloy: Se 0.6_ | experimental | [1] Zheng 2008; _cites Zavrazhnov 2004_ [doi](https://doi.org/10.1023/b:inma.0000016082.33860.43) | Table 5, p. 7, row 10; `ORC-7HXMVGDZ52` |  |
| Heat capacity; _printed: Cp°298_ | 120.8 J/mol (basis unstated)/K | 298.15 | β-Ga2Se3; _alloy: Se 0.6_ | experimental | [1] Zheng 2008; _cites Tyurin 2005_ [doi](https://doi.org/10.1007/s10789-005-0275-x) | Table 5, p. 7, row 11; `ORC-7MXYFRKEM5` |  |
| Heat capacity; _printed: Cp°298_ | 115.8 J/mol (basis unstated)/K | 298.15 | β-Ga2Se3; _alloy: Se 0.6_ | model | [1] Zheng 2008 | Table 5, p. 7, row 12; `ORC-IJQGB4W3NG` |  |
| Heat capacity; _printed: Cp°298_ | 116.3 J/mol (basis unstated)/K | 298.15 | β-Ga2Se3; _alloy: Se 0.6_ | model | [1] Zheng 2008; _cites Mills 1974_ | Table 5, p. 7, row 9; `ORC-IM3SLDJUVC` |  |
| Heat capacity; _printed: Cp°298_ | 117.57 J/mol (basis unstated)/K | 298.15 | β-Ga2Se3; _alloy: Se 0.6_ | experimental | [1] Zheng 2008; _cites Gadzhiev 1961_ | Table 5, p. 7, row 8; `ORC-Q7A2TGG3CD` |  |

## Sources

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

1. F. Zheng, J.Y. Shen, Y.Q. Liu, W.K. Kim, M.Y. Chu, M. Ider et al., Thermodynamic optimization of the Ga–Se system, Calphad 32, 432-438 (2008). [doi:10.1016/j.calphad.2008.03.004](https://doi.org/10.1016/j.calphad.2008.03.004)

## 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/).