# Co–Si system

> Co–Si system: 74 accepted literature values (invariant reaction 54, phase transition 14, formation 5, other property 1) and 2 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

74 accepted literature values from 2 paper(s) (experimental 49, model 13, unspecified 12); 2 calculated phase diagram(s). 21 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/CO-SI.json) · [CSV](https://data.orchid-project.org/systems/CO-SI.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CO-SI) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CO-SI/CoSi-06Zha.json) · [phases (10)](https://data.orchid-project.org/phases/pages/CO-SI.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CO-SI.html) · [Markdown](https://data.orchid-project.org/systems/CO-SI.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 49 |
| model | 13 |
| unspecified | 12 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 54 |
| phase transition | 14 |
| formation | 5 |
| other property | 1 |

## Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| CoSi-06Zha.tdb | L. Zhang, Y. Du, H. Xu, Z. Pan, Calphad, 30, 470-81(2006). [doi:10.1016/j.calphad.2006.06.001](https://doi.org/10.1016/j.calphad.2006.06.001) | `849716b03f938610d110fb62984db7ff0726ff00bd2e68a5a0e5c47433af5179` | [viewer](https://orchid-project.org/phase-diagrams/#CO-SI/CoSi-06Zha.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoSi-06Zha.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoSi-06Zha.json) |
| CoSi-92Cho-LB.tdb | S.-D. Choi, Calphad, 16, 151-59(1992). [doi:10.1016/0364-5916(92)90003-G](https://doi.org/10.1016/0364-5916%2892%2990003-G) | `9fb5aa520ab17aa5cab74dd30e406ecbd7d0ba3318df847e7d1ccdee473950c2` | [viewer](https://orchid-project.org/phase-diagrams/#CO-SI/CoSi-92Cho-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoSi-92Cho-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoSi-92Cho-LB.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CoSi-06Zha.tdb | 1594.25 | LIQUID (x(Si) 0.31643) + CO2SI_C37 (x(Si) 0.33297) + CO2SI_BETA (x(Si) 0.33337) |
| CoSi-06Zha.tdb | 1585.96 | COSI_B20 (x(Si) 0.51489) + LIQUID (x(Si) 0.63509) + COSI2_C1 (x(Si) 0.66667) |
| CoSi-06Zha.tdb | 1585.96 | COSI_B20 (x(Si) 0.51491) + LIQUID (x(Si) 0.63517) + COSI2_C1 (x(Si) 0.66667) |
| CoSi-06Zha.tdb | 1576.88 | CO2SI_BETA (x(Si) 0.34652) + LIQUID (x(Si) 0.37804) + COSI_B20 (x(Si) 0.49115) |
| CoSi-06Zha.tdb | 1532.45 | COSI2_C1 (x(Si) 0.66667) + LIQUID (x(Si) 0.77847) + DIAMOND_A4 (x(Si) 1) |
| CoSi-06Zha.tdb | 1532.45 | COSI2_C1 (x(Si) 0.66667) + LIQUID (x(Si) 0.77863) + DIAMOND_A4 (x(Si) 1) |
| CoSi-06Zha.tdb | 1512.3 | CO2SI_C37 (x(Si) 0.33776) + CO2SI_BETA (x(Si) 0.34317) + COSI_B20 (x(Si) 0.4914) |
| CoSi-06Zha.tdb | 1509.61 | FCC_A1 (x(Si) 0.13082) + HCP_A3 (x(Si) 0.15924) + LIQUID (x(Si) 0.20946) |
| CoSi-06Zha.tdb | 1487.93 | LIQUID (x(Si) 0.24267) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.32401) |
| CoSi-06Zha.tdb | 1475.55 | HCP_A3 (x(Si) 0.18563) + LIQUID (x(Si) 0.23231) + CO3SI_D019 (x(Si) 0.25) |
| CoSi-06Zha.tdb | 1467.38 | HCP_A3 (x(Si) 0.18891) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.32229) |
| CoSi-92Cho-LB.tdb | 1963.38 | LIQUID (x(Si) 0.51481) + HCP_A3 (x(Si) 0.55527) + FCC_A1 (x(Si) 0.55791) |
| CoSi-92Cho-LB.tdb | 1758.89 | HCP_A3 (x(Si) 0.69033) + FCC_A1 (x(Si) 0.69201) + LIQUID (x(Si) 0.72173) |
| CoSi-92Cho-LB.tdb | 1588.89 | COSI_B20 (x(Si) 0.5) + LIQUID (x(Si) 0.63052) + COSI2_C1 (x(Si) 0.66667) |
| CoSi-92Cho-LB.tdb | 1588.89 | COSI_B20 (x(Si) 0.5) + LIQUID (x(Si) 0.63023) + COSI2_C1 (x(Si) 0.66667) |
| CoSi-92Cho-LB.tdb | 1588.89 | COSI_B20 (x(Si) 0.5) + LIQUID (x(Si) 0.63063) + COSI2_C1 (x(Si) 0.66667) |
| CoSi-92Cho-LB.tdb | 1564.79 | CO2SI_C37 (x(Si) 0.33333) + LIQUID (x(Si) 0.3815) + COSI_B20 (x(Si) 0.5) |
| CoSi-92Cho-LB.tdb | 1564.79 | CO2SI_C37 (x(Si) 0.33333) + LIQUID (x(Si) 0.38166) + COSI_B20 (x(Si) 0.5) |
| CoSi-92Cho-LB.tdb | 1530.79 | COSI2_C1 (x(Si) 0.66667) + LIQUID (x(Si) 0.78879) + DIAMOND_A4 (x(Si) 1) |
| CoSi-92Cho-LB.tdb | 1530.79 | COSI2_C1 (x(Si) 0.66667) + LIQUID (x(Si) 0.78904) + DIAMOND_A4 (x(Si) 1) |
| CoSi-92Cho-LB.tdb | 1526.23 | FCC_A1 (x(Si) 0.16288) + HCP_A3 (x(Si) 0.16901) + LIQUID (x(Si) 0.2213) |
| CoSi-92Cho-LB.tdb | 1482.7 | LIQUID (x(Si) 0.24778) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.33333) |
| CoSi-92Cho-LB.tdb | 1482.7 | LIQUID (x(Si) 0.2479) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.33333) |
| CoSi-92Cho-LB.tdb | 1482.22 | HCP_A3 (x(Si) 0.19075) + LIQUID (x(Si) 0.24535) + CO3SI_D019 (x(Si) 0.25) |
| CoSi-92Cho-LB.tdb | 1482.22 | HCP_A3 (x(Si) 0.19073) + LIQUID (x(Si) 0.24533) + CO3SI_D019 (x(Si) 0.25) |
| CoSi-92Cho-LB.tdb | 1474.88 | HCP_A3 (x(Si) 0.19101) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.33333) |
| CoSi-92Cho-LB.tdb | 1474.88 | HCP_A3 (x(Si) 0.19102) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.33333) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CO/CO-SI.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CO/CO-SI.json) · [CALPHAD hull CoSi-92Cho-LB](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-SI--CoSi-92Cho-LB.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Co–Si system (54)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1738 | congruent melting: L -> CoSi | L: Si 0.5; CoSi: Si 0.5 | experimental | [1] Zhang 2006; _cites Kalishevich 1964_ | Table 5, p. 9, row 35; `ORC-HDNMJ2FA2Z` |  |
| 1733 | congruent melting: L -> CoSi | L: Si 0.5; CoSi: Si 0.5 | experimental | [1] Zhang 2006; _cites Haschimoto 1937_ [doi](https://doi.org/10.2320/jinstmet1937.1.3_135) | Table 5, p. 9, row 34; `ORC-O5P3PHDWG2` |  |
| 1730 | congruent melting: L -> CoSi | L: Si 0.5; CoSi: Si 0.5 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 36; `ORC-SOHMCORWQY` |  |
| 1605.15 | congruent melting: L -> βCo2Si | L: Si 0.333; βCo2Si: Si 0.333 | experimental | [1] Zhang 2006; _cites Haschimoto 1937_ [doi](https://doi.org/10.2320/jinstmet1937.1.3_135) | Table 5, p. 9, row 32; `ORC-APGGPVEQXZ` |  |
| 1605.15 | congruent melting: L -> βCo2Si | L: Si 0.333; βCo2Si: Si 0.333 | experimental | [1] Zhang 2006; _cites Vogel 1934_ [doi](https://doi.org/10.1002/srin.193400094) | Table 5, p. 9, row 31; `ORC-JH575NUFI7` |  |
| 1600 | congruent melting: L -> βCo2Si | L: Si 0.333; βCo2Si: Si 0.333 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 33; `ORC-SYA3G4HYVS` |  |
| 1599 | congruent melting: L -> CoSi2 | L: Si 0.667; CoSi2: Si 0.667 | experimental | [1] Zhang 2006; _cites Haschimoto 1937_ [doi](https://doi.org/10.2320/jinstmet1937.1.3_135) | Table 5, p. 9, row 37; `ORC-KYAXCAAM5U` |  |
| 1595 | congruent melting: L -> CoSi2 | L: Si 0.667; CoSi2: Si 0.667 | experimental | [1] Zhang 2006; _cites Kalishevich 1968_ | Table 5, p. 9, row 38; `ORC-3VQT27XX6Z` |  |
| 1593 | peritectic: L + βCo2Si -> αCo2Si | L: Si 0.31; βCo2Si: Si 0.326; αCo2Si: Si 0.33 | experimental | [1] Zhang 2006; _cites Ishida 1991_ [doi](https://doi.org/10.1007/bf02645074) | Table 5, p. 9, row 15; `ORC-GUWFEWFGSS` |  |
| 1593 | congruent melting: L -> CoSi2 | L: Si 0.667; CoSi2: Si 0.667 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 40; `ORC-PJ5ME4WP4Q` |  |
| 1592 | peritectic: L + βCo2Si -> αCo2Si | L: Si 0.312; βCo2Si: Si 0.333; αCo2Si: Si 0.333 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 16; `ORC-NDNVTS3D2L` |  |
| 1591 | congruent melting: L -> CoSi2 | L: Si 0.667; CoSi2: Si 0.667 | experimental | [1] Zhang 2006 | Table 5, p. 9, row 39; `ORC-VD27YOPH3S` |  |
| 1588.95 | L=CoSi+CoSi2 | L: Si 0.631; CoSi: Si 0.5; CoSi2: Si 0.667 | model | [2] Soon-Don 1992 | Table 3, p. 7, row 4; `ORC-EKDCI2XJQS` |  |
| 1587 | eutectic: L -> CoSi + CoSi2 | L: Si 0.635; CoSi: Si 0.515; CoSi2: Si 0.667 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 27; `ORC-XF2SXZPNOQ` |  |
| 1584 | eutectic: L -> CoSi + CoSi2 | CoSi: Co 0.5, Si 0.5; CoSi2: Co 0.333333, Si 0.666667 | experimental | [1] Zhang 2006 | Table 5, p. 9, row 26; `ORC-SMW6RCYKUO` |  |
| 1583.15 | L=CoSi+CoSi2 | L: Si 0.618; CoSi: Si 0.5; CoSi2: Si 0.667 | experimental | [2] Soon-Don 1992 | Table 3, p. 7, row 3; `ORC-EECAT2Y6SC` |  |
| 1583.15 | eutectic: L -> CoSi + CoSi2 | L: Si 0.618; CoSi: Si 0.521; CoSi2: Si 0.667 | experimental | [1] Zhang 2006; _cites Haschimoto 1937_ [doi](https://doi.org/10.2320/jinstmet1937.1.3_135) | Table 5, p. 9, row 25; `ORC-JI4IEEUZWH` |  |
| 1577 | eutectic: L -> βCo2Si + CoSi | L: Si 0.378; βCo2Si: Si 0.346; CoSi: Si 0.491 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 20; `ORC-MABXLYIVAG` |  |
| 1572 | eutectic: L -> βCo2Si + CoSi | βCo2Si: Co 0.666667, Si 0.333333; CoSi: Co 0.5, Si 0.5 | experimental | [1] Zhang 2006 | Table 5, p. 9, row 19; `ORC-R7RVLZSQJ3` |  |
| 1564.95 | L=Co2Si+CoSi | L: Si 0.382; Co2Si: Si 0.333; CoSi: Si 0.5 | model | [2] Soon-Don 1992 | Table 3, p. 7, row 6; `ORC-TXQGRK4RTG` |  |
| 1559.15 | eutectic: L -> βCo2Si + CoSi | L: Si 0.397; βCo2Si: Si 0.358; CoSi: Si 0.491 | experimental | [1] Zhang 2006; _cites Haschimoto 1937_ [doi](https://doi.org/10.2320/jinstmet1937.1.3_135) | Table 5, p. 9, row 18; `ORC-2FUMHM2IKV` |  |
| 1559.15 | L=Co2Si+CoSi | L: Si 0.397; Co2Si: Si 0.333; CoSi: Si 0.5 | experimental | [2] Soon-Don 1992 | Table 3, p. 7, row 5; `ORC-WBRKB7ZNW3` |  |
| 1543.15 | eutectic: L -> βCo2Si + CoSi | L: Si 0.396; βCo2Si: Si 0.36; CoSi: Si 0.5 | experimental | [1] Zhang 2006; _cites Vogel 1934_ [doi](https://doi.org/10.1002/srin.193400094) | Table 5, p. 9, row 17; `ORC-H5VU6NH6PG` |  |
| 1533 | eutectic: L -> CoSi2 + (Si) | L: Si 0.779; CoSi2: Si 0.667; (Si): Si 1 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 30; `ORC-ES2QYE7SFB` |  |
| 1533 | eutectic: L -> CoSi2 + (Si) | CoSi2: Co 0.333333, Si 0.666667 | experimental | [1] Zhang 2006 | Table 5, p. 9, row 29; `ORC-T3V637JQB7` |  |
| 1532.15 | eutectic: L -> CoSi2 + (Si) | L: Si 0.775; CoSi2: Si 0.667; (Si): Si 0.979 | experimental | [1] Zhang 2006; _cites Haschimoto 1937_ [doi](https://doi.org/10.2320/jinstmet1937.1.3_135) | Table 5, p. 9, row 28; `ORC-2PQKQKB4BX` |  |
| 1532.15 | L=CoSi2+Si | L: Si 0.775; CoSi2: Si 0.667; Si: Si 1 | experimental | [2] Soon-Don 1992 | Table 3, p. 7, row 1; `ORC-6DWHMR366U` |  |
| 1530.85 | L=CoSi2+Si | L: Si 0.789; CoSi2: Si 0.667; Si: Si 1 | model | [2] Soon-Don 1992 | Table 3, p. 7, row 2; `ORC-SMHMB6CYDR` |  |
| 1523.15 | peritectic: L + (αCo) -> (εCo) | L: Si 0.214; (αCo): Si 0.165; (εCo): Si 0.175 | experimental | [1] Zhang 2006; _cites Koster 1973_ | Table 5, p. 9, row 1; `ORC-6CNGCWPCXD` |  |
| 1523.15 | α-Co+L=ε-Co | α-Co: Si 0.165; L: Si 0.214; ε-Co: Si 0.175 | experimental | [2] Soon-Don 1992 | Table 3, p. 7, row 13; `ORC-LVZ4Q5SX2X` |  |
| 1520.55 | α-Co+L=ε-Co | α-Co: Si 0.162; L: Si 0.22; ε-Co: Si 0.168 | model | [2] Soon-Don 1992 | Table 3, p. 7, row 14; `ORC-4IXWIIZOMK` |  |
| 1517 | eutectoid: βCo2Si -> αCo2Si + CoSi | βCo2Si: Co 0.666667, Si 0.333333; αCo2Si: Co 0.666667, Si 0.333333; CoSi: Co 0.5, Si 0.5 | experimental | [1] Zhang 2006 | Table 5, p. 9, row 23; `ORC-NY6YYXELP4` |  |
| 1514 | peritectic: L + (αCo) -> (εCo) |  | experimental | [1] Zhang 2006 | Table 5, p. 9, row 2; `ORC-R4JLQZRQPJ` |  |
| 1511.15 | eutectoid: βCo2Si -> αCo2Si + CoSi | βCo2Si: Si 0.351; αCo2Si: Si 0.341; CoSi: Si 0.491 | experimental | [1] Zhang 2006; _cites Haschimoto 1937_ [doi](https://doi.org/10.2320/jinstmet1937.1.3_135) | Table 5, p. 9, row 22; `ORC-2SN65JQUYO` |  |
| 1511 | eutectoid: βCo2Si -> αCo2Si + CoSi | βCo2Si: Si 0.343; αCo2Si: Si 0.338; CoSi: Si 0.491 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 24; `ORC-Y3Z4ZBY3W3` |  |
| 1510 | peritectic: L + (αCo) -> (εCo) | L: Si 0.209; (αCo): Si 0.131; (εCo): Si 0.159 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 3; `ORC-4JPZ7KI2MW` |  |
| 1488 | peritectic: L + αCo2Si -> αCo3Si | L: Si 0.243; αCo2Si: Si 0.324; αCo3Si: Si 0.25 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 14; `ORC-ANH6AO3VIE` |  |
| 1487.15 | L+Co2Si=Co3Si | L: Si 0.244; Co2Si: Si 0.333; Co3Si: Si 0.25 | experimental | [2] Soon-Don 1992 | Table 3, p. 7, row 7; `ORC-26UH4G5SW7` |  |
| 1487 | peritectic: L + αCo2Si -> αCo3Si | L: Si 0.244; αCo2Si: Co 0.666667, Si 0.333333; αCo3Si: Si 0.25 | experimental | [1] Zhang 2006; _cites Koster 1973_ | Table 5, p. 9, row 13; `ORC-JVCBOUAWLP` |  |
| 1485.15 | peritectic: L + αCo2Si -> αCo3Si | L: Si 0.239; αCo2Si: Si 0.323; αCo3Si: Si 0.25 | experimental | [1] Zhang 2006; _cites Haschimoto 1937_ [doi](https://doi.org/10.2320/jinstmet1937.1.3_135) | Table 5, p. 9, row 11; `ORC-KCF72AOSWG` |  |
| 1483.15 | peritectic: L + αCo2Si -> αCo3Si | L: Si 0.248; αCo2Si: Si 0.333; αCo3Si: Si 0.25 | experimental | [1] Zhang 2006; _cites Vogel 1934_ [doi](https://doi.org/10.1002/srin.193400094) | Table 5, p. 9, row 10; `ORC-S2ZUWOXDZU` |  |
| 1483.15 | peritectic: L + αCo2Si -> αCo3Si | αCo2Si: Si 0.333; αCo3Si: Si 0.25 | experimental | [1] Zhang 2006; _cites Boomgaard 1972_ [doi](https://doi.org/10.1016/0001-6160%2872%2990001-6) | Table 5, p. 9, row 12; `ORC-VCIEXSDGJ3` |  |
| 1483.15 | L+Co2Si=Co3Si | L: Si 0.248; Co2Si: Si 0.333; Co3Si: Si 0.25 | model | [2] Soon-Don 1992 | Table 3, p. 7, row 8; `ORC-W4NOJ3RZLS` |  |
| 1481.35 | L=ε-Co+Co3Si | L: Si 0.242; ε-Co: Si 0.188; Co3Si: Si 0.25 | model | [2] Soon-Don 1992 | Table 3, p. 7, row 10; `ORC-YAYLHS7VEN` |  |
| 1481.15 | eutectoid: βCo2Si -> αCo2Si + CoSi | βCo2Si: Si 0.357; αCo2Si: Si 0.34; CoSi: Si 0.5 | experimental | [1] Zhang 2006; _cites Vogel 1934_ [doi](https://doi.org/10.1002/srin.193400094) | Table 5, p. 9, row 21; `ORC-TQSIBGE6BY` |  |
| 1478 | eutectic: L -> αCo3Si + (εCo) | αCo3Si: Co 0.75, Si 0.25 | experimental | [1] Zhang 2006 | Table 5, p. 9, row 5; `ORC-JV5TJKBGK5` |  |
| 1477.15 | eutectic: L -> αCo3Si + (εCo) | L: Si 0.231; αCo3Si: Si 0.25; (εCo): Si 0.184 | experimental | [1] Zhang 2006; _cites Koster 1973_ | Table 5, p. 9, row 4; `ORC-J52BXVKOHI` |  |
| 1477.15 | L=ε-Co+Co3Si | L: Si 0.231; ε-Co: Si 0.184; Co3Si: Si 0.25 | experimental | [2] Soon-Don 1992 | Table 3, p. 7, row 9; `ORC-WRXGLUWYOE` |  |
| 1475 | eutectic: L -> αCo3Si + (εCo) | L: Si 0.232; αCo3Si: Si 0.25; (εCo): Si 0.186 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 6; `ORC-5ZUXV6UIQI` |  |
| 1467 | eutectic: αCo3Si -> (εCo) + αCo2Si | αCo3Si: Si 0.25; (εCo): Si 0.189; αCo2Si: Si 0.322 | unspecified | [1] Zhang 2006 | Table 5, p. 9, row 9; `ORC-MCS3C6TXIE` |  |
| 1466.15 | eutectic: αCo3Si -> (εCo) + αCo2Si | αCo3Si: Si 0.25; (εCo): Si 0.181; αCo2Si: Co 0.666667, Si 0.333333 | experimental | [1] Zhang 2006; _cites Koster 1973_ | Table 5, p. 9, row 7; `ORC-3A3VIRW6WX` |  |
| 1466.15 | Co3Si=ε-Co+Co2Si | Co3Si: Si 0.25; ε-Co: Si 0.181; Co2Si: Si 0.333 | experimental | [2] Soon-Don 1992 | Table 3, p. 7, row 11; `ORC-MXIUQM5CTU` |  |
| 1464 | eutectic: αCo3Si -> (εCo) + αCo2Si | αCo3Si: Co 0.75, Si 0.25; αCo2Si: Co 0.666667, Si 0.333333 | experimental | [1] Zhang 2006 | Table 5, p. 9, row 8; `ORC-75BNS2PV2X` |  |
| 1463.05 | Co3Si=ε-Co+Co2Si | Co3Si: Si 0.25; ε-Co: Si 0.188; Co2Si: Si 0.333 | model | [2] Soon-Don 1992 | Table 3, p. 7, row 12; `ORC-TQJ7HRNR5O` |  |

## Other properties

### Phase transition (14)

Table: Phase transition, Co–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1373.15 K | 1373.15 | 1; _alloy: Co 0.88, Si 0.12_ | experimental | [1] Zhang 2006 | Table 2, p. 4, row 1; `ORC-4COD5NYEQ5` |  |
| Phase transition | 1373.15 K | 1373.15 | 2; _alloy: Co 0.8, Si 0.2_ | experimental | [1] Zhang 2006 | Table 2, p. 4, row 2; `ORC-56SP7KCRUT` |  |
| Phase transition | 1373.15 K | 1373.15 | 3; _alloy: Co 0.704, Si 0.296_ | experimental | [1] Zhang 2006 | Table 2, p. 4, row 3; `ORC-3LAT4BJ3N4` |  |
| Phase transition | 1373.15 K | 1373.15 | 4; _alloy: Co 0.6, Si 0.4_ | experimental | [1] Zhang 2006 | Table 2, p. 4, row 4; `ORC-RSWSQWOC42` |  |
| Phase transition | 1373.15 K | 1373.15 | 5; _alloy: Co 0.4, Si 0.6_ | experimental | [1] Zhang 2006 | Table 2, p. 4, row 5; `ORC-5GFJAG6ELB` |  |
| Phase transition | 1373.15 K | 1373.15 | 6; _alloy: Co 0.3333, Si 0.6667_ | experimental | [1] Zhang 2006 | Table 2, p. 4, row 6; `ORC-JYDDINLMJO` |  |
| Phase transition | 1373.15 K | 1373.15 | 7; _alloy: Co 0.28, Si 0.72_ | experimental | [1] Zhang 2006 | Table 2, p. 4, row 7; `ORC-64V2L2PRLE` |  |
| Phase transition | 1373.15 K | 1373.15 | 8; _alloy: Co 0.14, Si 0.86_ | experimental | [1] Zhang 2006 | Table 2, p. 4, row 8; `ORC-OJ33HGOLCL` |  |
| Phase transition | 1597.15 K | 1597.15 | L=CoSi2.; _CoSi2: Si 0.667_ | model | [2] Soon-Don 1992 | Table 3, p. 7, row 16; `ORC-VV7C6BP2KK` |  |
| Phase transition | 1599.15 K | 1599.15 | L=CoSi2.; _CoSi2: Si 0.667_ | experimental | [2] Soon-Don 1992 | Table 3, p. 7, row 15; `ORC-JUVNJTAOKI` |  |
| Phase transition | 1603.85 K | 1603.85 | L=Co2Si; _Co2Si: Si 0.333_ | model | [2] Soon-Don 1992 | Table 3, p. 7, row 20; `ORC-75CS3YBODK` |  |
| Phase transition | 1607.15 K | 1607.15 | L=Co2Si; _Co2Si: Si 0.333_ | experimental | [2] Soon-Don 1992 | Table 3, p. 7, row 19; `ORC-QBCFXDRBLJ` |  |
| Phase transition | 1728.25 K | 1728.25 | L=CoSi; _CoSi: Si 0.5_ | model | [2] Soon-Don 1992 | Table 3, p. 7, row 18; `ORC-2D4ZRDO5IM` |  |
| Phase transition | 1733.15 K | 1733.15 | L=CoSi; _CoSi: Si 0.5_ | experimental | [2] Soon-Don 1992 | Table 3, p. 7, row 17; `ORC-3ZJT7NNECE` |  |

### Formation (5)

Table: Formation, Co–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy of formation; _printed: ΔSf(298K)_ | -0.32 unknown | 298.15 | Co2Si; _alloy: Si 0.333333_ | model | [2] Soon-Don 1992 | Table 4, p. 8, row 2; `ORC-UCIBVETEIN.98b5af` |  |
| Entropy of formation; _printed: ΔSf(298K)_ | -1.2 unknown | 298.15 | Co2Si; _alloy: Si 0.333333_ | experimental | [2] Soon-Don 1992 | Table 4, p. 8, row 1; `ORC-YBTEL5XLNE.7532d7` |  |
| Entropy of formation; _printed: ΔSf(298K)_ | -2.4 unknown | 298.15 | CoSi; _alloy: Si 0.5_ | model | [2] Soon-Don 1992 | Table 4, p. 8, row 4; `ORC-FR4BEMYRDG.16f883` |  |
| Entropy of formation; _printed: ΔSf(298K)_ | -3.1 unknown | 298.15 | CoSi; _alloy: Si 0.5_ | experimental | [2] Soon-Don 1992 | Table 4, p. 8, row 3; `ORC-KKFS7ZNJRZ.e04513` |  |
| Entropy of formation; _printed: ΔSf(298K)_ | 0.63 unknown | 298.15 | CoSi2; _alloy: Si 0.666667_ | model | [2] Soon-Don 1992 | Table 4, p. 8, row 6; `ORC-2YIVH6RDES.b6e0f6` |  |

### Other property (1)

Table: Other property, Co–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Other; _printed: βCo_ | 1.35 μB | 1396 |  | experimental | [1] Zhang 2006; _cites Fernandez 1987_ | p. 8; `ORC-PLYRJJX7O6` | “According to Guillermet \[48\], TCo 0 (1396 K) and βCo (1.35 μB) of (εCo) phase are equal to those Co,Si of (αCo) phase.” |

## Sources

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

1. Lijun Zhang, Yong Du, Honghui Xu, Zhu Pan, Experimental investigation and thermodynamic description of the Co–Si system, Calphad 30, 470-481 (2006). [doi:10.1016/j.calphad.2006.06.001](https://doi.org/10.1016/j.calphad.2006.06.001)
2. Choi Soon-Don, Thermodynamic analysis of the Co-Si system, Calphad 16, 151-159 (1992). [doi:10.1016/0364-5916(92)90003-g](https://doi.org/10.1016/0364-5916%2892%2990003-g)

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735859
- R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735891
- R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0).

Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

```bibtex
@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).