# Se–Sn system

> Se–Sn system: 133 accepted literature values (phase transition 41, phase equilibrium 39, invariant reaction 37, 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/SE-SN.html · Markdown: https://data.orchid-project.org/systems/SE-SN.md

133 accepted literature values from 1 paper(s) (experimental 108, model 10, unspecified 15); 0 calculated phase diagram(s). 10 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/SE-SN.json) · [CSV](https://data.orchid-project.org/systems/SE-SN.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#SE-SN) · [phases (7)](https://data.orchid-project.org/phases/pages/SE-SN.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/SE-SN.html) · [Markdown](https://data.orchid-project.org/systems/SE-SN.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 108 |
| model | 10 |
| unspecified | 15 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 37 |
| phase transition | 41 |
| phase equilibrium | 39 |
| formation | 16 |

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

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Se–Sn system (37)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1105.15 | other: L2 -> L1 + βSnSe | L2: Se 0.42; L1: Se 0.27; βSnSe: Se 0.5, Sn 0.5 | experimental | [1] Feutelais 1996 | Table 4, p. 3, row 3; `ORC-H2T4LONKAP` |  |
| 1105 | L2 \<-> L1 + βSnSe | L2: Se 0.42; L1: Se 0.27; βSnSe: Se 0.5, Sn 0.5 | experimental | [1] Feutelais 1996 | Table 10, p. 9, row 15; `ORC-PM33W257ZD` |  |
| 1104.1 | L2 \<-> L1 + βSnSe | L2: Se 0.429; L1: Se 0.239; βSnSe: Se 0.5, Sn 0.5 | model | [1] Feutelais 1996 | Table 10, p. 9, row 16; `ORC-TEZTBEKRPQ` |  |
| 1103 | L2 \<-> L1 + βSnSe | βSnSe: Se 0.5, Sn 0.5 | experimental | [1] Feutelais 1996; _cites Rouland 1976_ | Table 10, p. 9, row 12; `ORC-S6SEWXZGVG` |  |
| 1095 | L2 \<-> L1 + βSnSe | βSnSe: Se 0.5, Sn 0.5 | unspecified | [1] Feutelais 1996; _cites Aleshina 1982_ | Table 10, p. 9, row 13; `ORC-N2GNA7NHQD` |  |
| 1094 | L2 \<-> L1 + βSnSe | L2: Se 0.463; L1: Se 0.193; βSnSe: Se 0.5, Sn 0.5 | unspecified | [1] Feutelais 1996; _cites Kotchi 1987_ | Table 10, p. 9, row 14; `ORC-ODAGQABTQM` |  |
| 1093 | L2 \<-> L1 + βSnSe | L2: Se 0.49; βSnSe: Se 0.5, Sn 0.5 | unspecified | [1] Feutelais 1996; _cites ref. 66Kar_ | Table 10, p. 9, row 11; `ORC-5SHNOS3SA2` |  |
| 911 | L2 \<-> βSnSe + SnSe2 | βSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | unspecified | [1] Feutelais 1996; _cites Aleshina 1982_ | Table 10, p. 9, row 20; `ORC-ILSSCNV3VB` |  |
| 909.5 | L2 \<-> βSnSe + SnSe2 | L2: Se 0.6; βSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | unspecified | [1] Feutelais 1996; _cites ref. 09Bil_ | Table 10, p. 9, row 17; `ORC-YVTXFM7IXC` |  |
| 905 | L2 \<-> βSnSe + SnSe2 | L2: Se 0.617; βSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | unspecified | [1] Feutelais 1996; _cites Kotchi 1987_ | Table 10, p. 9, row 21; `ORC-G2TP5S77WL` |  |
| 903.9 | L2 \<-> βSnSe + SnSe2 | L2: Se 0.611; βSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | model | [1] Feutelais 1996 | Table 10, p. 9, row 23; `ORC-JWNTWXZN7I` |  |
| 903 | L2 \<-> βSnSe + SnSe2 | βSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | experimental | [1] Feutelais 1996; _cites Rouland 1976_ | Table 10, p. 9, row 19; `ORC-TXHUVS2ZTZ` |  |
| 902.5 | L2 \<-> βSnSe + SnSe2 | L2: Se 0.613; βSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | experimental | [1] Feutelais 1996 | Table 10, p. 9, row 22; `ORC-37BMT57NTX` |  |
| 902.45 | eutectic: L2 -> βSnSe + SnSe2 | L2: Se 0.613; βSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | experimental | [1] Feutelais 1996 | Table 4, p. 3, row 4; `ORC-6IK6OR4X2T` |  |
| 898 | L2 \<-> βSnSe + SnSe2 | L2: Se 0.61; βSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | unspecified | [1] Feutelais 1996; _cites ref. 66Kar_ | Table 10, p. 9, row 18; `ORC-C552M5RHA3` |  |
| 813 | αSnSe \<-> L1 + βSnSe | αSnSe: Se 0.5, Sn 0.5; βSnSe: Se 0.5, Sn 0.5 | unspecified | [1] Feutelais 1996; _cites ref. 66Kar_ | Table 10, p. 9, row 7; `ORC-32YBLVWX2I` |  |
| 813 | βSnSe \<-> αSnSe + SnSe2 | βSnSe: Se 0.5, Sn 0.5; αSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | unspecified | [1] Feutelais 1996; _cites ref. 66Kar_ | Table 10, p. 9, row 24; `ORC-SSIJ5E7QOO` |  |
| 803 | αSnSe \<-> L1 + βSnSe | αSnSe: Se 0.5, Sn 0.5; βSnSe: Se 0.5, Sn 0.5 | experimental | [1] Feutelais 1996; _cites Rouland 1976_ | Table 10, p. 9, row 8; `ORC-QHGPLYLCLQ` |  |
| 803 | βSnSe \<-> αSnSe + SnSe2 | βSnSe: Se 0.5, Sn 0.5; αSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | experimental | [1] Feutelais 1996; _cites Rouland 1976_ | Table 10, p. 9, row 25; `ORC-UCA7ECCXM3` |  |
| 799.5 | αSnSe \<-> L1 + βSnSe | αSnSe: Se 0.5, Sn 0.5; L1: Se 0.025; βSnSe: Se 0.5, Sn 0.5 | experimental | [1] Feutelais 1996 | Table 10, p. 9, row 9; `ORC-2Q4WL2ARJV` |  |
| 799.45 | peritectic: αSnSe -> L1 + βSnSe | αSnSe: Se 0.5, Sn 0.5 (basis unresolved); βSnSe: Se 0.5, Sn 0.5 (basis unresolved) | experimental | [1] Feutelais 1996 | Table 4, p. 3, row 2; `ORC-YRRPDOA27R` |  |
| 796.5 | βSnSe \<-> αSnSe + SnSe2 | βSnSe: Se 0.5, Sn 0.5; αSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | model | [1] Feutelais 1996 | Table 10, p. 9, row 27; `ORC-23MB2MFLYO` |  |
| 796.5 | αSnSe \<-> L1 + βSnSe | αSnSe: Se 0.5, Sn 0.5; L1: Se 0.008; βSnSe: Se 0.5, Sn 0.5 | model | [1] Feutelais 1996 | Table 10, p. 9, row 10; `ORC-J2SYVRND2Y` |  |
| 793.4 | βSnSe \<-> αSnSe + SnSe2 | βSnSe: Se 0.5, Sn 0.5; αSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | experimental | [1] Feutelais 1996 | Table 10, p. 9, row 26; `ORC-ICETCEN3MW` |  |
| 793.35 | eutectic: βSnSe -> αSnSe + SnSe2 | βSnSe: Se 0.5, Sn 0.5; αSnSe: Se 0.5, Sn 0.5; SnSe2: Se 0.666667, Sn 0.333333 | experimental | [1] Feutelais 1996 | Table 4, p. 3, row 5; `ORC-YNW3UCH6VA` |  |
| 506 | L1 \<-> βSn + αSnSe | αSnSe: Se 0.5, Sn 0.5 | unspecified | [1] Feutelais 1996; _cites ref. 09Bil_ | Table 10, p. 9, row 1; `ORC-L5YRPBUJNP` |  |
| 505.1 | L1 \<-> βSn + αSnSe | αSnSe: Se 0.5, Sn 0.5 | model | [1] Feutelais 1996 | Table 10, p. 9, row 6; `ORC-QIRPXLBTAR` |  |
| 505 | L1 \<-> βSn + αSnSe | αSnSe: Se 0.5, Sn 0.5 | experimental | [1] Feutelais 1996; _cites Rouland 1976_ | Table 10, p. 9, row 3; `ORC-HDG742SLER` |  |
| 505 | L1 \<-> βSn + αSnSe | αSnSe: Se 0.5, Sn 0.5 | unspecified | [1] Feutelais 1996; _cites ref. 66Kar_ | Table 10, p. 9, row 2; `ORC-LA4334OYCE` |  |
| 505 | L1 \<-> βSn + αSnSe | αSnSe: Se 0.5, Sn 0.5 | unspecified | [1] Feutelais 1996; _cites Kotchi 1987_ | Table 10, p. 9, row 4; `ORC-YYGXYBVNIW` |  |
| 504.9 | L1 \<-> βSn + αSnSe | αSnSe: Se 0.5, Sn 0.5 | experimental | [1] Feutelais 1996 | Table 10, p. 9, row 5; `ORC-AD7R7WCGIV` |  |
| 504.85 | eutectic: L1 -> βSn + αSnSe | αSnSe: Se 0.5, Sn 0.5 | experimental | [1] Feutelais 1996 | Table 4, p. 3, row 1; `ORC-X63I4IFULJ` |  |
| 493.05 | eutectic: L2 -> SnSe2 + Se | SnSe2: Se 0.666667, Sn 0.333333 | experimental | [1] Feutelais 1996 | Table 4, p. 3, row 6; `ORC-KN7HI2QHFP` |  |
| 493 | L2 \<-> SnSe2 + Se | SnSe2: Se 0.666667, Sn 0.333333 | unspecified | [1] Feutelais 1996; _cites ref. 09Bil_ | Table 10, p. 9, row 28; `ORC-2E7EF57PWW` |  |
| 493 | L2 \<-> SnSe2 + Se | SnSe2: Se 0.666667, Sn 0.333333 | unspecified | [1] Feutelais 1996; _cites ref. 66Kar_ | Table 10, p. 9, row 29; `ORC-DT47RMYRV6` |  |
| 493 | L2 \<-> SnSe2 + Se | SnSe2: Se 0.666667, Sn 0.333333 | experimental | [1] Feutelais 1996; _cites Rouland 1976_ | Table 10, p. 9, row 30; `ORC-RF2VNYTO6Y` |  |
| 493 | L2 \<-> SnSe2 + Se | SnSe2: Se 0.666667, Sn 0.333333 | unspecified | [1] Feutelais 1996; _cites Kotchi 1987_ | Table 10, p. 9, row 31; `ORC-VQEVGYZNBC` |  |

## 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, Se–Sn system (16)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| SnSe | [SnSe](https://data.orchid-project.org/compounds/SnSe.html) | -54.7 kJ/mol-atom | 298.15 | model | -64.505 (mp-aaaaabap) | -46.56 (oqmd-3656) | [1] Feutelais 1996 | Table 9, p. 8, row 11; `ORC-FU4YYPX6NM.a7871b` |  |
| SnSe | [SnSe](https://data.orchid-project.org/compounds/SnSe.html) | -47.5 kJ/mol-atom ± 1 | 298.15 | experimental | -64.505 (mp-aaaaabap) | -46.56 (oqmd-3656) | [1] Feutelais 1996; _cites ref. 71Mel_ | Table 9, p. 8, row 6; `ORC-V7VHHJ5GSB.b91536` |  |
| SnSe | [SnSe](https://data.orchid-project.org/compounds/SnSe.html) | -47 kJ/mol-atom ± 1.5 | 298.15 | experimental | -64.505 (mp-aaaaabap) | -46.56 (oqmd-3656) | [1] Feutelais 1996; _cites Boone 1992_ [doi](https://doi.org/10.1016/0040-6031%2892%2987043-a) | Table 9, p. 8, row 9; `ORC-2CEFS6VVEV.afeb02` |  |
| SnSe | [SnSe](https://data.orchid-project.org/compounds/SnSe.html) | -45.5 kJ/mol-atom ± 2 | 298.15 | experimental | -64.505 (mp-aaaaabap) | -46.56 (oqmd-3656) | [1] Feutelais 1996; _cites Hajiev 1960_ | Table 9, p. 8, row 1; `ORC-OTLJ2QNFR6` |  |
| SnSe | [SnSe](https://data.orchid-project.org/compounds/SnSe.html) | -45 kJ/mol-atom ± 3.5 | 298.15 | experimental | -64.505 (mp-aaaaabap) | -46.56 (oqmd-3656) | [1] Feutelais 1996; _cites ref. 64Col_ | Table 9, p. 8, row 2; `ORC-TZ4OR4CMJG` |  |
| SnSe | [SnSe](https://data.orchid-project.org/compounds/SnSe.html) | -44.8 kJ/mol-atom ± 0.2 | 298.15 | experimental | -64.505 (mp-aaaaabap) | -46.56 (oqmd-3656) | [1] Feutelais 1996; _cites ref. 67Kar_ | Table 9, p. 8, row 3; `ORC-SXCESCRLPN.a39dda` |  |
| SnSe2 | [SnSe2](https://data.orchid-project.org/compounds/SnSe2.html) | -51 kJ/mol-atom ± 3 | 298.15 | experimental | -63.078 (mp-aaaaaazp) | -36.161 (oqmd-8151) | [1] Feutelais 1996; _cites ref. 67Kar_ | Table 9, p. 8, row 4; `ORC-L6DLXHTE3T` |  |
| SnSe2 | [SnSe2](https://data.orchid-project.org/compounds/SnSe2.html) | -51 kJ/mol-atom ± 3 | 298.15 | experimental | -63.078 (mp-aaaaaazp) | -36.161 (oqmd-8151) | [1] Feutelais 1996; _cites ref. 67Kar_ | Table 9, p. 8, row 3; `ORC-SXCESCRLPN.cb8c38` |  |
| SnSe2 | [SnSe2](https://data.orchid-project.org/compounds/SnSe2.html) | -42.3 kJ/mol-atom ± 0.5 | 298.15 | experimental | -63.078 (mp-aaaaaazp) | -36.161 (oqmd-8151) | [1] Feutelais 1996; _cites Boone 1992_ [doi](https://doi.org/10.1016/0040-6031%2892%2987043-a) | Table 9, p. 8, row 9; `ORC-2CEFS6VVEV.f2095c` |  |
| SnSe2 | [SnSe2](https://data.orchid-project.org/compounds/SnSe2.html) | -42.3 kJ/mol-atom ± 0.5 | 298.15 | experimental | -63.078 (mp-aaaaaazp) | -36.161 (oqmd-8151) | [1] Feutelais 1996; _cites Boone 1992_ [doi](https://doi.org/10.1016/0040-6031%2892%2987043-a) | Table 9, p. 8, row 10; `ORC-UINOJIYKR4` |  |
| SnSe2 | [SnSe2](https://data.orchid-project.org/compounds/SnSe2.html) | -41.5 kJ/mol-atom ± 0.4 | 298.15 | experimental | -63.078 (mp-aaaaaazp) | -36.161 (oqmd-8151) | [1] Feutelais 1996; _cites ref. 71Mel_ | Table 9, p. 8, row 7; `ORC-5IJONAH7FM` |  |
| SnSe2 | [SnSe2](https://data.orchid-project.org/compounds/SnSe2.html) | -41.5 kJ/mol-atom ± 0.4 | 298.15 | experimental | -63.078 (mp-aaaaaazp) | -36.161 (oqmd-8151) | [1] Feutelais 1996; _cites ref. 71Mel_ | Table 9, p. 8, row 6; `ORC-V7VHHJ5GSB.6a43c7` |  |
| SnSe2 | [SnSe2](https://data.orchid-project.org/compounds/SnSe2.html) | -40.3 kJ/mol-atom ± 2.7 | 298.15 | experimental | -63.078 (mp-aaaaaazp) | -36.161 (oqmd-8151) | [1] Feutelais 1996; _cites ref. 67Rau_ | Table 9, p. 8, row 5; `ORC-YL3KI5HEBL` |  |
| SnSe2 | [SnSe2](https://data.orchid-project.org/compounds/SnSe2.html) | -36.3 kJ/mol-atom ± 7 | 298.15 | experimental | -63.078 (mp-aaaaaazp) | -36.161 (oqmd-8151) | [1] Feutelais 1996; _cites Kulyukhina 1977_ | Table 9, p. 8, row 8; `ORC-EIUIOMC7XT` |  |
| SnSe2 | [SnSe2](https://data.orchid-project.org/compounds/SnSe2.html) | -34.9 kJ/mol-atom | 298.15 | model | -63.078 (mp-aaaaaazp) | -36.161 (oqmd-8151) | [1] Feutelais 1996 | Table 9, p. 8, row 12; `ORC-B3YKNHHBIQ` |  |
| SnSe2 | [SnSe2](https://data.orchid-project.org/compounds/SnSe2.html) | -34.9 kJ/mol-atom | 298.15 | model | -63.078 (mp-aaaaaazp) | -36.161 (oqmd-8151) | [1] Feutelais 1996 | Table 9, p. 8, row 11; `ORC-FU4YYPX6NM.31244a` |  |

## Other properties

### Phase transition (41)

Table: Phase transition, Se–Sn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 492.85 K | 492.85 | other: Invariants; _alloy: Se 0.85, Sn 0.15_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 73; `ORC-CLHMZC2N2V` |  |
| Phase transition | 493.05 K | 493.05 | other: Invariants; _alloy: Se 0.7, Sn 0.3_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 67; `ORC-NM64V44ZPE` |  |
| Phase transition | 493.05 K | 493.05 | other: Invariants; _alloy: Se 0.75, Sn 0.25_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 69; `ORC-O3FSH3TOIX` |  |
| Phase transition | 493.05 K | 493.05 | other: Invariants; _alloy: Se 0.9, Sn 0.1_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 75; `ORC-VB7JPGMR7C` |  |
| Phase transition | 493.15 K | 493.15 | other: Invariants; _alloy: Se 0.8, Sn 0.2_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 71; `ORC-FXCSUFG7K6` |  |
| Phase transition | 504.65 K | 504.65 | other: Invariants; _alloy: Se 0.4, Sn 0.6_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 16; `ORC-DRUT25R43X` |  |
| Phase transition | 504.65 K | 504.65 | other: Invariants; _alloy: Se 0.3, Sn 0.7_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 10; `ORC-Q7NZ4PQDFY` |  |
| Phase transition | 504.65 K | 504.65 | other: Invariants; _alloy: Se 0.35, Sn 0.65_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 13; `ORC-SAFCXT64MV` |  |
| Phase transition | 504.75 K | 504.75 | other: Invariants; _alloy: Se 0.49, Sn 0.51_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 23; `ORC-AGDNB3AQ2E` |  |
| Phase transition | 504.75 K | 504.75 | other: Invariants; _alloy: Se 0.25, Sn 0.75_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 8; `ORC-XNIKCZNI6W` |  |
| Phase transition | 504.85 K | 504.85 | other: Invariants; _alloy: Se 0.495, Sn 0.505_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 28; `ORC-FNPPXHJVI2` |  |
| Phase transition | 504.85 K | 504.85 | other: Invariants; _alloy: Se 0.45, Sn 0.55_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 19; `ORC-JT7UPOTWZG` |  |
| Phase transition | 504.85 K | 504.85 | other: Invariants; _alloy: Se 0.1, Sn 0.9_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 2; `ORC-PURLHOV55X` |  |
| Phase transition | 504.85 K | 504.85 | other: Invariants; _alloy: Se 0.2, Sn 0.8_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 5; `ORC-ZTKW2CSCDL` |  |
| Phase transition | 515 K | 515 | polymorphic: \[94Yam\] | experimental | [1] Feutelais 1996; _cites Yamaguchi 1994_ [doi](https://doi.org/10.2320/matertrans1989.35.118) | Table 5, p. 3, row 11; `ORC-PKCETQW2BB` |  |
| Phase transition | 524 K | 524 | polymorphic: \[79Wie\] | experimental | [1] Feutelais 1996; _cites Wiedemeier 1981_ | Table 5, p. 3, row 7; `ORC-NE7URJCSIM` |  |
| Phase transition | 527.5 K | 527.5 | polymorphic: \[81Bal\] | experimental | [1] Feutelais 1996; _cites ref. 81Bal_ | Table 5, p. 3, row 8; `ORC-FKJG4QLN5A` |  |
| Phase transition | 535 K | 535 | polymorphic: \[63Dem\] | experimental | [1] Feutelais 1996; _cites Dembovskii 1964_ | Table 5, p. 3, row 2; `ORC-PSN74ETZCT` |  |
| Phase transition | 787.15 K | 787.15 | polymorphic: \[74Bla1\] | experimental | [1] Feutelais 1996; _cites ref. 74Bla1_ | Table 5, p. 3, row 4; `ORC-FNTNIZIRU2` |  |
| Phase transition | 787.15 K | 787.15 | polymorphic: \[74Bla2\] | experimental | [1] Feutelais 1996; _cites Blachnik 1974_ | Table 5, p. 3, row 5; `ORC-4PSCCXZEGX` |  |
| Phase transition | 792.05 K | 792.05 | other: Invariants; _alloy: Se 0.59, Sn 0.41_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 53; `ORC-OLBHDSCMHH` |  |
| Phase transition | 792.75 K | 792.75 | other: Invariants; _alloy: Se 0.6, Sn 0.4_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 56; `ORC-MNWLXOT5FV` |  |
| Phase transition | 792.85 K | 792.85 | other: Invariants; _alloy: Se 0.56, Sn 0.44_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 44; `ORC-5RX7IVOLDE` |  |
| Phase transition | 793.15 K | 793.15 | other: Invariants; _alloy: Se 0.63, Sn 0.37_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 61; `ORC-BFEUI7MI3B` |  |
| Phase transition | 793.15 K | 793.15 | other: Invariants; _alloy: Se 0.57, Sn 0.43_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 47; `ORC-D2BQFG7WKM` |  |
| Phase transition | 793.15 K | 793.15 | other: Invariants; _alloy: Se 0.58, Sn 0.42_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 50; `ORC-GCYHPDWXH5` |  |
| Phase transition | 793.15 K | 793.15 | other: Invariants; _alloy: Se 0.61, Sn 0.39_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 58; `ORC-ZUDY6P7EKM` |  |
| Phase transition | 793.55 K | 793.55 | other: Invariants; _alloy: Se 0.53, Sn 0.47_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 38; `ORC-VACZHYB5FI` |  |
| Phase transition | 793.75 K | 793.75 | other: Invariants; _alloy: Se 0.55, Sn 0.45_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 41; `ORC-ELASJ5VGHU` |  |
| Phase transition | 794.15 K | 794.15 | other: Solidus; _alloy: Se 0.505, Sn 0.495_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 33; `ORC-RB6QG2NEZP` |  |
| Phase transition | 794.25 K | 794.25 | other: Solidus; _alloy: Se 0.51, Sn 0.49_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 36; `ORC-6XZQXRNA2A` |  |
| Phase transition | 797.45 K | 797.45 | other: Solidus; _alloy: Se 0.495, Sn 0.505_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 27; `ORC-Q6BMGUXVSZ` |  |
| Phase transition | 803.15 K | 803.15 | polymorphic: \[76Rou\] | experimental | [1] Feutelais 1996; _cites Rouland 1976_ | Table 5, p. 3, row 6; `ORC-I74OZ6U4MS` |  |
| Phase transition | 813.15 K | 813.15 | polymorphic: \[66Kar\] | experimental | [1] Feutelais 1996; _cites ref. 66Kar_ | Table 5, p. 3, row 3; `ORC-YFRMOZ73GL` |  |
| Phase transition | 814.15 K | 814.15 | polymorphic: \[61Zhd\] | experimental | [1] Feutelais 1996; _cites Zhdanova 1961_ | Table 5, p. 3, row 1; `ORC-XPUIYXHXZM` |  |
| Phase transition | 814.15 K | 814.15 | polymorphic: \[87Ras, 91Ras\] | experimental | [1] Feutelais 1996; _cites Rasulov 1987_ | Table 5, p. 3, row 10; `ORC-R3DKDWW57O` |  |
| Phase transition | 902.25 K | 902.25 | other: Invariants; _alloy: Se 0.505, Sn 0.495_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 34; `ORC-EQ47IURIT5` |  |
| Phase transition | 902.55 K | 902.55 | other: Invariants; _alloy: Se 0.51, Sn 0.49_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 37; `ORC-Q7KBJUSAG7` |  |
| Phase transition | 902.55 K | 902.55 | other: Invariants; _alloy: Se 0.65, Sn 0.35_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 64; `ORC-VRB7MWE7WL` |  |
| Phase transition | 918.15 K | 918.15 | other: Invariants; _alloy: Se 0.667, Sn 0.333_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 65; `ORC-PEGIU6CFVS` |  |
| Phase transition | 1145.65 K | 1145.65 | other: Invariants; _alloy: Se 0.5, Sn 0.5_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 31; `ORC-WS4MPZ5OCJ` |  |

### Phase equilibrium (39)

Table: Phase equilibrium, Se–Sn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase composition |  | 793.35 | polymorphic: αSnSe -> βSnSe; _αSnSe: Sn 0.5; βSnSe: Sn 0.5_ | experimental | [1] Feutelais 1996 | Table 5, p. 3, row 14; `ORC-3EVOYPM6SI` |  |
| Phase composition |  | 794.25 | other: Solidus; _αSnSe: Se 0.5, Sn 0.5_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 30; `ORC-OWND3BCV5X` |  |
| Phase composition |  | 799.45 | polymorphic: αSnSe -> βSnSe; _αSnSe: Sn 0.5; βSnSe: Sn 0.5_ | experimental | [1] Feutelais 1996 | Table 5, p. 3, row 15; `ORC-U4XYD7FJJL` |  |
| Phase composition |  | 872.45 | other: Liquidus; _liquid: Se 0.9, Sn 0.1_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 74; `ORC-ECOEZG7NVF` |  |
| Phase composition |  | 886.95 | other: Liquidus; _liquid: Se 0.85, Sn 0.15_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 72; `ORC-GCLNPIUH5A` |  |
| Phase composition |  | 897.35 | other: Liquidus; _liquid: Se 0.8, Sn 0.2_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 70; `ORC-J3YLT526VG` |  |
| Phase composition |  | 908.15 | other: Liquidus; _liquid: Se 0.75, Sn 0.25_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 68; `ORC-LT7QX4SFQS` |  |
| Phase composition |  | 913.15 | other: Liquidus; _liquid: Se 0.63, Sn 0.37_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 60; `ORC-YNZP3QFNXE` |  |
| Phase composition |  | 915.55 | other: Liquidus; _liquid: Se 0.7, Sn 0.3_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 66; `ORC-RADERL7CLT` |  |
| Phase composition |  | 916.75 | other: Liquidus; _liquid: Se 0.65, Sn 0.35_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 63; `ORC-TLRKDPZDJF` |  |
| Phase composition |  | 918 | congruent melting: Sn0.33Se0.67; _liquid: Sn 0.33_ | experimental | [1] Feutelais 1996; _cites ref. 06Pel_ | Table 3, p. 3, row 24; `ORC-6GYTM7CQ2X` |  |
| Phase composition |  | 918.2 | congruent melting: Sn0.33Se0.67; _liquid: Sn 0.33_ | experimental | [1] Feutelais 1996 | Table 3, p. 3, row 37; `ORC-XTHJG7GRTH` |  |
| Phase composition |  | 919.8 | congruent melting: Sn0.33Se0.67; _liquid: Sn 0.33_ | model | [1] Feutelais 1996 | Table 3, p. 3, row 39; `ORC-2JI2ZEMBPC` |  |
| Phase composition |  | 929 | congruent melting: Sn0.33Se0.67; _liquid: Sn 0.33_ | experimental | [1] Feutelais 1996; _cites ref. 09Bil_ | Table 3, p. 3, row 26; `ORC-CI3MTR7FUI` |  |
| Phase composition |  | 929 | congruent melting: Sn0.33Se0.67; _liquid: Sn 0.33_ | experimental | [1] Feutelais 1996; _cites Aleshina 1982_ | Table 3, p. 3, row 33; `ORC-GPDLUMNRZX` |  |
| Phase composition |  | 930 | congruent melting: Sn0.33Se0.67; _liquid: Sn 0.33_ | experimental | [1] Feutelais 1996; _cites ref. 66Kar_ | Table 3, p. 3, row 28; `ORC-SMQP52O466` |  |
| Phase composition |  | 933.15 | other: Liquidus; _liquid: Se 0.6, Sn 0.4_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 55; `ORC-6OYJZC6IV5` |  |
| Phase composition |  | 948 | congruent melting: Sn0.33Se0.67; _liquid: Sn 0.33_ | experimental | [1] Feutelais 1996; _cites A 1970_ | Table 3, p. 3, row 29; `ORC-SAOQGOMT55` |  |
| Phase composition |  | 963.15 | other: Liquidus; _liquid: Se 0.59, Sn 0.41_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 52; `ORC-USXNJIAPJJ` |  |
| Phase composition |  | 995.15 | other: Liquidus; _liquid: Se 0.58, Sn 0.42_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 49; `ORC-RY2EHDAQJO` |  |
| Phase composition |  | 1017.55 | other: Liquidus; _liquid: Se 0.57, Sn 0.43_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 46; `ORC-NDOP5JWZLS` |  |
| Phase composition |  | 1043.65 | other: Liquidus; _liquid: Se 0.56, Sn 0.44_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 43; `ORC-AT65AN365V` |  |
| Phase composition |  | 1048.75 | other: Liquidus; _liquid: Se 0.1, Sn 0.9_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 1; `ORC-DGAOFTJS66` |  |
| Phase composition |  | 1066.75 | other: Liquidus; _liquid: Se 0.55, Sn 0.45_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 40; `ORC-IQOM5DJODB` |  |
| Phase composition |  | 1095.85 | other: Liquidus; _liquid: Se 0.2, Sn 0.8_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 4; `ORC-5B63ZLEXKN` |  |
| Phase composition |  | 1104.55 | other: Liquidus; _liquid: Se 0.25, Sn 0.75_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 7; `ORC-2PJ4Z43KRH` |  |
| Phase composition |  | 1133 | congruent melting: βSn0.5Se0.5; _liquid: Sn 0.5_ | experimental | [1] Feutelais 1996; _cites ref. 06Pel_ | Table 3, p. 3, row 23; `ORC-UEVW4LEMHZ` |  |
| Phase composition |  | 1134 | congruent melting: βSn0.5Se0.5; _liquid: Sn 0.5_ | experimental | [1] Feutelais 1996; _cites ref. 09Bil_ | Table 3, p. 3, row 25; `ORC-XY2KXN2K4V` |  |
| Phase composition |  | 1135 | congruent melting: βSn0.5Se0.5; _liquid: Sn 0.5_ | experimental | [1] Feutelais 1996; _cites ref. 81Bal_ | Table 3, p. 3, row 31; `ORC-GXQM7RQPJY` |  |
| Phase composition |  | 1135 | congruent melting: βSn0.5Se0.5; _liquid: Sn 0.5_ | experimental | [1] Feutelais 1996; _cites Rouland 1976_ | Table 3, p. 3, row 30; `ORC-WNUNFT457F` |  |
| Phase composition |  | 1138 | congruent melting: βSn0.5Se0.5; _liquid: Sn 0.5_ | experimental | [1] Feutelais 1996; _cites Huifang 1992_ | Table 3, p. 3, row 34; `ORC-KNF6JT37G4` |  |
| Phase composition |  | 1138.15 | other: Liquidus; _liquid: Se 0.51, Sn 0.49_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 35; `ORC-BTHW3X77CA` |  |
| Phase composition |  | 1138.65 | other: Liquidus; _liquid: Se 0.49, Sn 0.51_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 22; `ORC-OA5HT7TPPJ` |  |
| Phase composition |  | 1144.05 | other: Liquidus; _liquid: Se 0.505, Sn 0.495_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 32; `ORC-HKJ76PIAMJ` |  |
| Phase composition |  | 1144.65 | other: Liquidus; _liquid: Se 0.495, Sn 0.505_ | experimental | [1] Feutelais 1996 | Table 2, p. 2, row 26; `ORC-YL2KRS2BAX` |  |
| Phase composition |  | 1145.7 | congruent melting: βSn0.5Se0.5; _liquid: Sn 0.5_ | experimental | [1] Feutelais 1996 | Table 3, p. 3, row 36; `ORC-AB2X3O5U2I` |  |
| Phase composition |  | 1146.9 | congruent melting: βSn0.5Se0.5; _liquid: Sn 0.5_ | model | [1] Feutelais 1996 | Table 3, p. 3, row 38; `ORC-7SLN6PCSAD` |  |
| Phase composition |  | 1149 | congruent melting: βSn0.5Se0.5; _liquid: Sn 0.5_ | experimental | [1] Feutelais 1996; _cites Yamaguchi 1994_ [doi](https://doi.org/10.2320/matertrans1989.35.118) | Table 3, p. 3, row 35; `ORC-AKPQGTGMPN` |  |
| Phase composition |  | 1153 | congruent melting: βSn0.5Se0.5; _liquid: Sn 0.5_ | experimental | [1] Feutelais 1996; _cites ref. 66Kar_ | Table 3, p. 3, row 27; `ORC-YULDJMGZRV` |  |

## Sources

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

1. Y. Feutelais, M. Majid, B. Legendre, S. G. Frics, Phase diagram investigation and proposition of a thermodynamic evaluation of the Tin-Selenium system, JPE 17, 40-49 (1996). [doi:10.1007/bf02648368](https://doi.org/10.1007/bf02648368)

## 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/).