# Co–Ge system

> Co–Ge system: 151 accepted literature values (invariant reaction 77, formation 55, crystal structure 17, phase transition 2) and 4 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

151 accepted literature values from 3 paper(s) (experimental 55, model 96); 4 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/CO-GE.json) · [CSV](https://data.orchid-project.org/systems/CO-GE.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CO-GE) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CO-GE/CoGe-04Kor-LB.json) · [phases (15)](https://data.orchid-project.org/phases/pages/CO-GE.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CO-GE.html) · [Markdown](https://data.orchid-project.org/systems/CO-GE.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 55 |
| model | 96 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 77 |
| phase transition | 2 |
| formation | 55 |
| crystal structure | 17 |

## 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 |
|---|---|---|---|
| CoGe-04Kor-LB.tdb | J. Korb, GTT-Technologies, unpublished work, 2004. | `526f50de552aafad130e5f8e677d5d594e977c91b7f8fb6928e640177ad3577d` | [viewer](https://orchid-project.org/phase-diagrams/#CO-GE/CoGe-04Kor-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoGe-04Kor-LB.json) |
| CoGe-13Don.tdb | S.S. Dong, S.G. Liu, X.M. Tao, F.H. Xiao, L.H. Huang, F. Yang, Y. He, Q. Chen, H.S. Liu, Z.P. Jin, Thermochim. Acta, 572, 94-100(2013). [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) | `160f80fc562e4adc1997702994ff940a74f7bce2be10fe08eb3b1a08ca3333b1` | [viewer](https://orchid-project.org/phase-diagrams/#CO-GE/CoGe-13Don.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoGe-13Don.json) |
| CoGe-19Zen-ass.tdb | Y. Zeng, Y. Du, H. Li, P. Zhou, S. Liu, K. Cheng, B. Sundman, R. Schmid-Fetzer, L. Dreval, J. Alloys Compd., 793, 480-91(2019). [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) | `de75e3c47d8e84dbf939a028f92101d404527917ff7a8a705aabf8a3efe320ec` | [viewer](https://orchid-project.org/phase-diagrams/#CO-GE/CoGe-19Zen-ass.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoGe-19Zen-ass.json) |
| CoGe-19Zen-sub.tdb | Y. Zeng, Y. Du, H. Li, P. Zhou, S. Liu, K. Cheng, B. Sundman, R. Schmid-Fetzer, L. Dreval, J. Alloys Compd., 793, 480-91(2019). [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) | `2837674f94c2f6612fe467d09fc153191e6036214b485c689de723f3b09c8135` | [viewer](https://orchid-project.org/phase-diagrams/#CO-GE/CoGe-19Zen-sub.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoGe-19Zen-sub.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CoGe-04Kor-LB.tdb | 1383.74 | FCC_A1 (x(Ge) 0.17235) + HCP_A3 (x(Ge) 0.18183) + LIQUID (x(Ge) 0.24467) |
| CoGe-04Kor-LB.tdb | 1374.65 | HCP_A3 (x(Ge) 0.18553) + LIQUID (x(Ge) 0.24983) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 1256.27 | CO5GE3 (x(Ge) 0.375) + COGE (x(Ge) 0.5) + LIQUID (x(Ge) 0.60159) |
| CoGe-04Kor-LB.tdb | 1256.27 | CO5GE3 (x(Ge) 0.375) + COGE (x(Ge) 0.5) + LIQUID (x(Ge) 0.60141) |
| CoGe-04Kor-LB.tdb | 1105.05 | COGE (x(Ge) 0.5) + COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.7718) |
| CoGe-04Kor-LB.tdb | 1105.05 | COGE (x(Ge) 0.5) + COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.77222) |
| CoGe-04Kor-LB.tdb | 1105.05 | COGE (x(Ge) 0.5) + COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.77236) |
| CoGe-04Kor-LB.tdb | 1105.05 | COGE (x(Ge) 0.5) + COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.77181) |
| CoGe-04Kor-LB.tdb | 1098.07 | COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.78967) + DIAMOND_A4 (x(Ge) 1) |
| CoGe-04Kor-LB.tdb | 1098.07 | COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.78996) + DIAMOND_A4 (x(Ge) 1) |
| CoGe-04Kor-LB.tdb | 1098.07 | COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.79035) + DIAMOND_A4 (x(Ge) 1) |
| CoGe-04Kor-LB.tdb | 1098.07 | COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.79035) + DIAMOND_A4 (x(Ge) 1) |
| CoGe-04Kor-LB.tdb | 1081.76 | COGE (x(Ge) 0.5) + CO5GE7 (x(Ge) 0.58333) + COGE2 (x(Ge) 0.66667) |
| CoGe-04Kor-LB.tdb | 1043.47 | HCP_A3 (x(Ge) 0.15803) + CO3GE (x(Ge) 0.25) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 1043.47 | HCP_A3 (x(Ge) 0.15805) + CO3GE (x(Ge) 0.25) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 1043.01 | HCP_A3 (x(Ge) 0.15799) + CO3GE (x(Ge) 0.25) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 923.25 | HCP_A3 (x(Ge) 0.14979) + CO3GE (x(Ge) 0.25) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 923.25 | HCP_A3 (x(Ge) 0.14978) + CO3GE (x(Ge) 0.25) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 923.25 | HCP_A3 (x(Ge) 0.14977) + CO3GE (x(Ge) 0.25) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 909.22 | HCP_A3 (x(Ge) 0.1489) + CO5GE2 (x(Ge) 0.28571) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 909.22 | HCP_A3 (x(Ge) 0.14891) + CO5GE2 (x(Ge) 0.28571) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 908.37 | HCP_A3 (x(Ge) 0.14885) + CO5GE2 (x(Ge) 0.28571) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 655.89 | HCP_A3 (x(Ge) 0.13469) + CO5GE2 (x(Ge) 0.28571) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 655.89 | HCP_A3 (x(Ge) 0.13467) + CO5GE2 (x(Ge) 0.28571) + CO5GE3 (x(Ge) 0.375) |
| CoGe-04Kor-LB.tdb | 655.89 | HCP_A3 (x(Ge) 0.13467) + CO5GE2 (x(Ge) 0.28571) + CO5GE3 (x(Ge) 0.375) |
| CoGe-13Don.tdb | 1395.36 | FCC_A1 (x(Ge) 0.15426) + HCP_A3 (x(Ge) 0.19591) + LIQUID (x(Ge) 0.25102) |
| CoGe-13Don.tdb | 1386.59 | HCP_A3 (x(Ge) 0.20219) + LIQUID (x(Ge) 0.25808) + CO5GE3_B82 (x(Ge) 0.33898) |
| CoGe-13Don.tdb | 1259.57 | CO5GE3_B82 (x(Ge) 0.40549) + COGE (x(Ge) 0.49977) + LIQUID (x(Ge) 0.59425) |
| CoGe-13Don.tdb | 1105.71 | COGE (x(Ge) 0.52711) + COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.74482) |
| CoGe-13Don.tdb | 1103.81 | COGE (x(Ge) 0.52691) + CO5GE7 (x(Ge) 0.58333) + COGE2 (x(Ge) 0.66667) |
| CoGe-13Don.tdb | 1103.81 | COGE (x(Ge) 0.5269) + CO5GE7 (x(Ge) 0.58333) + COGE2 (x(Ge) 0.66667) |
| CoGe-13Don.tdb | 1087.69 | COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.78277) + DIAMOND_A4 (x(Ge) 1) |
| CoGe-13Don.tdb | 1087.69 | COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.78292) + DIAMOND_A4 (x(Ge) 1) |
| CoGe-13Don.tdb | 1040.3 | HCP_A3 (x(Ge) 0.18711) + CO3GE (x(Ge) 0.25) + CO5GE3_B82 (x(Ge) 0.35532) |
| CoGe-13Don.tdb | 927.83 | HCP_A3 (x(Ge) 0.17707) + CO3GE (x(Ge) 0.25) + CO5GE3_B82 (x(Ge) 0.3622) |
| CoGe-13Don.tdb | 927.83 | HCP_A3 (x(Ge) 0.17705) + CO3GE (x(Ge) 0.25) + CO5GE3_B82 (x(Ge) 0.3622) |
| CoGe-13Don.tdb | 924.45 | HCP_A3 (x(Ge) 0.17652) + CO5GE2 (x(Ge) 0.28571) + CO5GE3_B82 (x(Ge) 0.36245) |
| CoGe-13Don.tdb | 924.45 | HCP_A3 (x(Ge) 0.1765) + CO5GE2 (x(Ge) 0.28571) + CO5GE3_B82 (x(Ge) 0.36246) |
| CoGe-13Don.tdb | 655.66 | CO5GE2 (x(Ge) 0.28571) + CO5GE3_C37 (x(Ge) 0.375) + CO5GE3_B82 (x(Ge) 0.38866) |
| CoGe-13Don.tdb | 652.37 | HCP_A3 (x(Ge) 0.15304) + CO5GE2 (x(Ge) 0.28571) + CO5GE3_C37 (x(Ge) 0.375) |
| CoGe-13Don.tdb | 652.37 | HCP_A3 (x(Ge) 0.15303) + CO5GE2 (x(Ge) 0.28571) + CO5GE3_C37 (x(Ge) 0.375) |
| CoGe-13Don.tdb | 388.08 | CO5GE3_C37 (x(Ge) 0.375) + CO5GE3_B82 (x(Ge) 0.41301) + COGE (x(Ge) 0.49057) |
| CoGe-19Zen-ass.tdb | 1413.6 | FCC_A1 (x(Ge) 0.13101) + HCP_A3 (x(Ge) 0.14975) + LIQUID (x(Ge) 0.24479) |
| CoGe-19Zen-ass.tdb | 1401.9 | HCP_A3 (x(Ge) 0.15432) + LIQUID (x(Ge) 0.25105) + CO5GE3_B82 (x(Ge) 0.34001) |
| CoGe-19Zen-ass.tdb | 1262.24 | CO5GE3_B82 (x(Ge) 0.40051) + COGE (x(Ge) 0.4952) + LIQUID (x(Ge) 0.56871) |
| CoGe-19Zen-ass.tdb | 1122.01 | COGE (x(Ge) 0.5282) + COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.74221) |
| CoGe-19Zen-ass.tdb | 1119.77 | COGE (x(Ge) 0.52793) + CO5GE7 (x(Ge) 0.58333) + COGE2 (x(Ge) 0.66667) |
| CoGe-19Zen-ass.tdb | 1103.33 | COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.78757) + DIAMOND_A4 (x(Ge) 1) |
| CoGe-19Zen-ass.tdb | 1072.48 | HCP_A3 (x(Ge) 0.14166) + L12_FCC (x(Ge) 0.24763) + CO5GE3_B82 (x(Ge) 0.33949) |
| CoGe-19Zen-ass.tdb | 933.99 | L12_FCC (x(Ge) 0.24857) + CO2GE_C37 (x(Ge) 0.33333) + CO5GE3_B82 (x(Ge) 0.33948) |
| CoGe-19Zen-ass.tdb | 905.65 | HCP_A3 (x(Ge) 0.12779) + L12_FCC (x(Ge) 0.24867) + CO2GE_C37 (x(Ge) 0.33333) |
| CoGe-19Zen-sub.tdb | 1425.86 | FCC_A1 (x(Ge) 0.1483) + HCP_A3 (x(Ge) 0.16893) + LIQUID (x(Ge) 0.23496) |
| CoGe-19Zen-sub.tdb | 1393.44 | HCP_A3 (x(Ge) 0.18589) + LIQUID (x(Ge) 0.25813) + CO5GE3_B82 (x(Ge) 0.34533) |
| CoGe-19Zen-sub.tdb | 1276.8 | CO5GE3_B82 (x(Ge) 0.41207) + COGE (x(Ge) 0.48736) + LIQUID (x(Ge) 0.56632) |
| CoGe-19Zen-sub.tdb | 1108.78 | COGE (x(Ge) 0.52883) + CO5GE7 (x(Ge) 0.58333) + LIQUID (x(Ge) 0.75179) |
| CoGe-19Zen-sub.tdb | 1108.24 | CO5GE7 (x(Ge) 0.58333) + COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.75243) |
| CoGe-19Zen-sub.tdb | 1091.84 | COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.78638) + DIAMOND_A4 (x(Ge) 1) |
| CoGe-19Zen-sub.tdb | 1091.84 | COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.78662) + DIAMOND_A4 (x(Ge) 1) |
| CoGe-19Zen-sub.tdb | 1091.84 | COGE2 (x(Ge) 0.66667) + LIQUID (x(Ge) 0.78705) + DIAMOND_A4 (x(Ge) 1) |
| CoGe-19Zen-sub.tdb | 1052.75 | HCP_A3 (x(Ge) 0.17028) + L12_FCC (x(Ge) 0.25008) + CO5GE3_B82 (x(Ge) 0.34614) |
| CoGe-19Zen-sub.tdb | 894 | HCP_A3 (x(Ge) 0.15677) + L12_FCC (x(Ge) 0.2499) + CO5GE3_B82 (x(Ge) 0.34733) |
| CoGe-19Zen-sub.tdb | 890.4 | HCP_A3 (x(Ge) 0.15649) + CO2GE_C37 (x(Ge) 0.33333) + CO5GE3_B82 (x(Ge) 0.34737) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CO/CO-GE.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CO/CO-GE.json) · [CALPHAD hull CoGe-04Kor-LB](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-GE--CoGe-04Kor-LB.json) · [CALPHAD hull CoGe-13Don](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-GE--CoGe-13Don.json) · [CALPHAD hull CoGe-19Zen-sub](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-GE--CoGe-19Zen-sub.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Co–Ge system (77)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1768.15 | congruent melting: L -> αCo | αCo: Ge 0 | model | [1] Ansara 1991 | Table 1, p. 5, row 1; `ORC-TRIZI6ZY22` |  |
| 1483.15 | congruent melting: L -> βCo5Ge3 | L: Ge 0.375; βCo5Ge3: Ge 0.375 | model | [1] Ansara 1991 | Table 1, p. 5, row 2; `ORC-JAOM2HNCZH` |  |
| 1483 | congruent melting: L \<-> βCo5Ge3 | L: Ge 0.375; βCo5Ge3: Ge 0.375 | experimental | [2] Zeng 2019; _cites Dayer 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990252-0) | Table 2, p. 3, row 1; `ORC-Q4PIJTHFK7` |  |
| 1477 | congruent melting: L \<-> βCo5Ge3 | L: Ge 0.348; βCo5Ge3: Ge 0.348 | model | [2] Zeng 2019 | Table 2, p. 3, row 4; `ORC-VMVJFXDBUQ` |  |
| 1473 | congruent melting: L \<-> βCo5Ge3 | L: Ge 0.345; βCo5Ge3: Ge 0.345 | experimental | [2] Zeng 2019; _cites Pfisterer 1949_ | Table 2, p. 3, row 2; `ORC-LFJUSHEJIU` |  |
| 1457 | congruent melting: L \<-> βCo5Ge3 | L: Ge 0.355; βCo5Ge3: Ge 0.355 | model | [2] Zeng 2019 | Table 2, p. 3, row 3; `ORC-XBCQ5QDDDV` |  |
| 1426 | peritectic: L + α(Co) \<-> ε(Co) | L: Ge 0.235; α(Co): Ge 0.148; ε(Co): Ge 0.169 | model | [2] Zeng 2019 | Table 2, p. 3, row 7; `ORC-HDMSEFQLKR` |  |
| 1414 | peritectic: L + α(Co) \<-> ε(Co) | L: Ge 0.245; α(Co): Ge 0.131; ε(Co): Ge 0.15 | model | [2] Zeng 2019 | Table 2, p. 3, row 8; `ORC-APGUSJZYIS` |  |
| 1406 | peritectic: L + α(Co) \<-> ε(Co) |  | experimental | [2] Zeng 2019; _cites Zeng 2017_ [doi](https://doi.org/10.1007/s11669-017-0592-1) | Table 2, p. 3, row 6; `ORC-IDGJQSV7NM` |  |
| 1402 | eutectic: L \<-> ε(Co) + βCo5Ge3 | L: Ge 0.251; ε(Co): Ge 0.154; βCo5Ge3: Ge 0.34 | model | [2] Zeng 2019 | Table 2, p. 3, row 13; `ORC-PWYAI3WGTX` |  |
| 1396.15 | peritectic: L + (αCo) -> (εCo) | L: Ge 0.252; (αCo): Ge 0.165; (εCo): Ge 0.175 | model | [1] Ansara 1991 | Table 1, p. 5, row 3; `ORC-YE3WBZ4ITF` |  |
| 1396 | peritectic: L + α(Co) \<-> ε(Co) | L: Ge 0.252; α(Co): Ge 0.165; ε(Co): Ge 0.175 | experimental | [2] Zeng 2019; _cites Dayer 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990252-0) | Table 2, p. 3, row 5; `ORC-R4NR3HT7Q5` |  |
| 1396 | peritectic: L + α(Co) -> ε(Co) | L: Ge 0.252; α(Co): Ge 0.165; ε(Co): Ge 0.175 | model | [3] Dong 2013; _cites Ishida 1991_ [doi](https://doi.org/10.1007/bf02663679) | Table 7, p. 6, row 3; `ORC-V4VK6FDWIX` |  |
| 1395 | peritectic: L + α(Co) -> ε(Co) | L: Ge 0.251; α(Co): Ge 0.154; ε(Co): Ge 0.196 | model | [3] Dong 2013 | Table 7, p. 6, row 5; `ORC-XU4FU75H2M` |  |
| 1393 | eutectic: L \<-> ε(Co) + βCo5Ge3 | L: Ge 0.258; ε(Co): Ge 0.186; βCo5Ge3: Ge 0.345 | model | [2] Zeng 2019 | Table 2, p. 3, row 12; `ORC-NASQUMCL4U` |  |
| 1393 | peritectic: L + α(Co) -> ε(Co) |  | experimental | [3] Dong 2013; _cites Enoki 1990_ [doi](https://doi.org/10.1016/0022-5088%2890%2990117-3) | Table 7, p. 6, row 4; `ORC-YHZWTVTPTC` |  |
| 1391 | eutectic: L \<-> ε(Co) + βCo5Ge3 | βCo5Ge3: Co 0.625, Ge 0.375 | experimental | [2] Zeng 2019; _cites Zeng 2017_ [doi](https://doi.org/10.1007/s11669-017-0592-1) | Table 2, p. 3, row 11; `ORC-2BAK36DQHF` |  |
| 1386 | eutectic: L -> ε(Co) + βCo5Ge3 | L: Ge 0.258; ε(Co): Ge 0.202; βCo5Ge3: Ge 0.339 | model | [3] Dong 2013 | Table 7, p. 6, row 9; `ORC-6LIT5EYJIX` |  |
| 1383 | eutectic: L \<-> ε(Co) + βCo5Ge3 | L: Ge 0.255; ε(Co): Ge 0.18; βCo5Ge3: Ge 0.325 | experimental | [2] Zeng 2019; _cites Pfisterer 1949_ | Table 2, p. 3, row 9; `ORC-GXYWY4JEO4` |  |
| 1383 | eutectic: L -> ε(Co) + βCo5Ge3 | βCo5Ge3: Ge 0.375 | experimental | [3] Dong 2013; _cites Pfisterer 1949_ [doi](https://doi.org/10.1515/ijmr-1949-401006) | Table 7, p. 6, row 7; `ORC-Q7YYXH2UNB` |  |
| 1381.15 | eutectic: L -> (εCo) + βCo5Ge3 | L: Ge 0.255; (εCo): Ge 0.18; βCo5Ge3: Ge 0.325 | model | [1] Ansara 1991 | Table 1, p. 5, row 4; `ORC-5VLZY4LBEU` |  |
| 1381 | eutectic: L -> ε(Co) + βCo5Ge3 | L: Ge 0.255; ε(Co): Ge 0.18; βCo5Ge3: Ge 0.325 | model | [3] Dong 2013; _cites Ishida 1991_ [doi](https://doi.org/10.1007/bf02663679) | Table 7, p. 6, row 6; `ORC-G7X5BTOSNP` |  |
| 1381 | eutectic: L \<-> ε(Co) + βCo5Ge3 | L: Ge 0.255; ε(Co): Ge 0.18; βCo5Ge3: Ge 0.325 | experimental | [2] Zeng 2019; _cites Dayer 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990252-0) | Table 2, p. 3, row 10; `ORC-YY6SRG2PU3` |  |
| 1378 | eutectic: L -> ε(Co) + βCo5Ge3 | βCo5Ge3: Ge 0.375 | experimental | [3] Dong 2013; _cites Enoki 1990_ [doi](https://doi.org/10.1016/0022-5088%2890%2990117-3) | Table 7, p. 6, row 8; `ORC-CZM7T6WEAB` |  |
| 1277 | peritectic: L + βCo5Ge3 \<-> CoGe | L: Ge 0.566; βCo5Ge3: Ge 0.412; CoGe: Ge 0.487 | model | [2] Zeng 2019 | Table 2, p. 3, row 16; `ORC-4M37BFB6SM` |  |
| 1263 | peritectic: L + βCo5Ge3 \<-> CoGe | βCo5Ge3: Co 0.625, Ge 0.375; CoGe: Co 0.5, Ge 0.5 | experimental | [2] Zeng 2019; _cites Zeng 2017_ [doi](https://doi.org/10.1007/s11669-017-0592-1) | Table 2, p. 3, row 15; `ORC-IDI4YT6Y57` |  |
| 1262 | peritectic: L + βCo5Ge3 \<-> CoGe | L: Ge 0.569; βCo5Ge3: Ge 0.401; CoGe: Ge 0.495 | model | [2] Zeng 2019 | Table 2, p. 3, row 17; `ORC-LMAYM36CZ2` |  |
| 1260 | peritectic: L + βCo5Ge3 -> CoGe | L: Ge 0.594; βCo5Ge3: Ge 0.405; CoGe: Ge 0.5 | model | [3] Dong 2013 | Table 7, p. 6, row 12; `ORC-DXSXLPDRMJ` |  |
| 1258.15 | peritectic: βCo5Ge3 + L -> CoGe | βCo5Ge3: Ge 0.43; L: Ge 0.525; CoGe: Ge 0.5 | model | [1] Ansara 1991 | Table 1, p. 5, row 5; `ORC-XYR4DEEEMR` |  |
| 1258 | peritectic: L + βCo5Ge3 -> CoGe | L: Ge 0.525; βCo5Ge3: Ge 0.43; CoGe: Ge 0.5 | model | [3] Dong 2013; _cites Ishida 1991_ [doi](https://doi.org/10.1007/bf02663679) | Table 7, p. 6, row 10; `ORC-SLTN3XER5O` |  |
| 1256.45 | congruent melting: L -> Ge | Ge: Ge 1 | model | [1] Ansara 1991 | Table 1, p. 5, row 6; `ORC-75JCGLNANH` |  |
| 1255 | peritectic: L + βCo5Ge3 -> CoGe | βCo5Ge3: Ge 0.375; CoGe: Ge 0.5 | experimental | [3] Dong 2013; _cites Pfisterer 1949_ [doi](https://doi.org/10.1515/ijmr-1949-401006) | Table 7, p. 6, row 11; `ORC-LKAQYZ46GS` |  |
| 1255 | peritectic: L + βCo5Ge3 \<-> CoGe | L: Ge 0.525; βCo5Ge3: Ge 0.43; CoGe: Ge 0.5 | experimental | [2] Zeng 2019; _cites Pfisterer 1949_ | Table 2, p. 3, row 14; `ORC-MJ27G4RB7U` |  |
| 1123 | peritectic: L + CoGe \<-> CoGe2 | L: Ge 0.741; CoGe: Ge 0.528; CoGe2: Ge 0.667 | model | [2] Zeng 2019 | Table 2, p. 3, row 22; `ORC-ZF5XXDEMSV` |  |
| 1115 | peritectic: L + CoGe -> CoGe2 | CoGe: Ge 0.5; CoGe2: Ge 0.666667 | experimental | [3] Dong 2013; _cites Pfisterer 1949_ [doi](https://doi.org/10.1515/ijmr-1949-401006) | Table 7, p. 6, row 14; `ORC-22RJWTFGRD` |  |
| 1115 | peritectic: L + CoGe \<-> CoGe2 | L: Ge 0.71; CoGe: Ge 0.5; CoGe2: Ge 0.667 | experimental | [2] Zeng 2019; _cites Pfisterer 1949_ | Table 2, p. 3, row 18; `ORC-766QUTF5RL` |  |
| 1112 | peritectic: L + CoGe \<-> CoGe2 | CoGe: Co 0.5, Ge 0.5; CoGe2: Co 0.333333, Ge 0.666667 | experimental | [2] Zeng 2019; _cites Zeng 2017_ [doi](https://doi.org/10.1007/s11669-017-0592-1) | Table 2, p. 3, row 20; `ORC-MBCMUUL6JI` |  |
| 1109 | peritectic: L + CoGe \<-> CoGe2 | L: Ge 0.751; CoGe: Ge 0.529; CoGe2: Ge 0.667 | model | [2] Zeng 2019 | Table 2, p. 3, row 21; `ORC-ORJL4KJAJW` |  |
| 1107 | peritectic: L + CoGe -> CoGe2 | L: Ge 0.744; CoGe: Ge 0.527; CoGe2: Ge 0.667 | model | [3] Dong 2013 | Table 7, p. 6, row 15; `ORC-EHDUWOKU6X` |  |
| 1105.15 | peritectic: CoGe + L -> CoGe2 | CoGe: Ge 0.525; L: Ge 0.71; CoGe2: Ge 0.667 | model | [1] Ansara 1991 | Table 1, p. 5, row 7; `ORC-S5R3T6CYMD` |  |
| 1105 | peritectic: L + CoGe \<-> CoGe2 | CoGe: Co 0.5, Ge 0.5; CoGe2: Co 0.333333, Ge 0.666667 | experimental | [2] Zeng 2019; _cites Dayer 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990252-0) | Table 2, p. 3, row 19; `ORC-HPYMPZ27B3` |  |
| 1105 | peritectic: L + CoGe -> CoGe2 | L: Ge 0.71; CoGe: Ge 0.525; CoGe2: Ge 0.667 | model | [3] Dong 2013; _cites Ishida 1991_ [doi](https://doi.org/10.1007/bf02663679) | Table 7, p. 6, row 13; `ORC-XIZPLLLXVJ` |  |
| 1104 | eutectic: L \<-> CoGe2 + (Ge) | L: Ge 0.788; CoGe2: Ge 0.667; (Ge): Ge 1 | model | [2] Zeng 2019 | Table 2, p. 3, row 27; `ORC-S6XV2UZSGF` |  |
| 1099 | eutectic: L \<-> CoGe2 + (Ge) | CoGe2: Co 0.333333, Ge 0.666667 | experimental | [2] Zeng 2019; _cites Zeng 2017_ [doi](https://doi.org/10.1007/s11669-017-0592-1) | Table 2, p. 3, row 25; `ORC-XYHT5UBJGJ` |  |
| 1092 | eutectic: L \<-> CoGe2 + (Ge) | L: Ge 0.787; CoGe2: Ge 0.667; (Ge): Ge 1 | model | [2] Zeng 2019 | Table 2, p. 3, row 26; `ORC-UZCDS6Z66L` |  |
| 1090.15 | eutectic: L -> CoGe2 + (Ge) | L: Ge 0.73; CoGe2: Ge 0.667; (Ge): Ge 1 | model | [1] Ansara 1991 | Table 1, p. 5, row 8; `ORC-UJD7DVKDTT` |  |
| 1090 | eutectic: L -> CoGe2 + (Ge) | L: Ge 0.73; CoGe2: Ge 0.667; (Ge): Ge 1 | model | [3] Dong 2013; _cites Ishida 1991_ [doi](https://doi.org/10.1007/bf02663679) | Table 7, p. 6, row 16; `ORC-2AEWC4KI5M` |  |
| 1090 | eutectic: L \<-> CoGe2 + (Ge) | L: Ge 0.75; CoGe2: Ge 0.665; (Ge): Ge 1 | experimental | [2] Zeng 2019; _cites Dayer 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990252-0) | Table 2, p. 3, row 24; `ORC-HTDX4YL3FP` |  |
| 1089 | peritectoid: CoGe2 + CoGe \<-> Co5Ge7 | CoGe2: Co 0.333333, Ge 0.666667; CoGe: Co 0.5, Ge 0.5; Co5Ge7: Co 0.416667, Ge 0.583333 | experimental | [2] Zeng 2019; _cites Zeng 2017_ [doi](https://doi.org/10.1007/s11669-017-0592-1) | Table 2, p. 3, row 29; `ORC-N4FGHOOX7Q` |  |
| 1088 | eutectic: L -> CoGe2 + (Ge) | L: Ge 0.783; CoGe2: Ge 0.667; (Ge): Ge 1 | model | [3] Dong 2013 | Table 7, p. 6, row 18; `ORC-HMVM5FQV5V` |  |
| 1083 | eutectic: L -> CoGe2 + (Ge) | CoGe2: Ge 0.666667; (Ge): Ge 1 | experimental | [3] Dong 2013; _cites Pfisterer 1949_ [doi](https://doi.org/10.1515/ijmr-1949-401006) | Table 7, p. 6, row 17; `ORC-CPN3DE7NDN` |  |
| 1083 | eutectic: L \<-> CoGe2 + (Ge) | L: Ge 0.73; CoGe2: Ge 0.667; (Ge): Ge 1 | experimental | [2] Zeng 2019; _cites Pfisterer 1949_ | Table 2, p. 3, row 23; `ORC-OYOWP3LK23` |  |
| 1080 | peritectoid: CoGe2 + CoGe \<-> Co5Ge7 | CoGe2: Ge 0.667; CoGe: Ge 0.523; Co5Ge7: Ge 0.583 | model | [2] Zeng 2019 | Table 2, p. 3, row 31; `ORC-CFOKCL7FT3` |  |
| 1079.15 | peritectoid: CoGe + CoGe2 -> Co5Ge7 | CoGe: Ge 0.52; CoGe2: Ge 0.667; Co5Ge7: Ge 0.583 | model | [1] Ansara 1991 | Table 1, p. 5, row 9; `ORC-CZAQ7YBKPR` |  |
| 1079 | peritectoid: CoGe + CoGe2 -> Co5Ge7 | CoGe: Ge 0.52; CoGe2: Ge 0.667; Co5Ge7: Ge 0.583 | model | [3] Dong 2013; _cites Ishida 1991_ [doi](https://doi.org/10.1007/bf02663679) | Table 7, p. 6, row 19; `ORC-LXZNUPJD2W` |  |
| 1079 | peritectoid: CoGe + CoGe2 -> Co5Ge7 | CoGe: Ge 0.524; CoGe2: Ge 0.667; Co5Ge7: Ge 0.583 | model | [3] Dong 2013 | Table 7, p. 6, row 20; `ORC-OUFYIY5U23` |  |
| 1079 | peritectoid: CoGe2 + CoGe \<-> Co5Ge7 | CoGe2: Ge 0.665; CoGe: Ge 0.5; Co5Ge7: Ge 0.58 | experimental | [2] Zeng 2019; _cites Dayer 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990252-0) | Table 2, p. 3, row 28; `ORC-WFKXAUJ2SD` |  |
| 1078 | peritectoid: CoGe2 + CoGe \<-> Co5Ge7 | CoGe2: Ge 0.667; CoGe: Ge 0.525; Co5Ge7: Ge 0.583 | model | [2] Zeng 2019 | Table 2, p. 3, row 30; `ORC-UBGA45SYZ4` |  |
| 1072 | eutectoid: ε(Co) + βCo5Ge3 \<-> Co3Ge | ε(Co): Ge 0.142; βCo5Ge3: Ge 0.339; Co3Ge: Ge 0.248 | model | [2] Zeng 2019 | Table 2, p. 3, row 34; `ORC-ZTRIRSK3AJ` |  |
| 1053 | eutectoid: ε(Co) + βCo5Ge3 \<-> Co3Ge | ε(Co): Ge 0.17; βCo5Ge3: Ge 0.346; Co3Ge: Ge 0.25 | model | [2] Zeng 2019 | Table 2, p. 3, row 33; `ORC-7L6W56QTOT` |  |
| 1043.15 | peritectoid: (εCo) + βCo5Ge3 -> Co3Ge | (εCo): Ge 0.17; βCo5Ge3: Ge 0.22; Co3Ge: Ge 0.345 | model | [1] Ansara 1991 | Table 1, p. 5, row 10; `ORC-QXDJMYAJCG` |  |
| 1043 | peritectoid: ε(Co) + βCo5Ge3 -> Co3Ge | ε(Co): Ge 0.17; βCo5Ge3: Ge 0.345; Co3Ge: Ge 0.22 | model | [3] Dong 2013; _cites Ishida 1991_ [doi](https://doi.org/10.1007/bf02663679) | Table 7, p. 6, row 21; `ORC-44CZ6E4WFK` |  |
| 1043 | peritectoid: ε(Co) + βCo5Ge3 -> Co3Ge | ε(Co): Ge 0.187; βCo5Ge3: Ge 0.355; Co3Ge: Ge 0.25 | model | [3] Dong 2013 | Table 7, p. 6, row 22; `ORC-4MFY652Q3W` |  |
| 1043 | eutectoid: ε(Co) + βCo5Ge3 \<-> Co3Ge | ε(Co): Ge 0.17; βCo5Ge3: Ge 0.345; Co3Ge: Ge 0.22 | experimental | [2] Zeng 2019; _cites Dayer 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990252-0) | Table 2, p. 3, row 32; `ORC-VON5AK27EG` |  |
| 958 | peritectoid: Co3Ge + βCo5Ge3 \<-> Co2Ge | Co3Ge: Ge 0.248; βCo5Ge3: Ge 0.339; Co2Ge: Ge 0.333 | model | [2] Zeng 2019 | Table 2, p. 3, row 36; `ORC-U3PSOFMCN5` |  |
| 927 | eutectoid: Co3Ge -> ε(Co) + βCo5Ge3 | Co3Ge: Ge 0.25; ε(Co): Ge 0.177; βCo5Ge3: Ge 0.362 | model | [3] Dong 2013 | Table 7, p. 6, row 24; `ORC-VZPBQDBZLS` |  |
| 923.15 | eutectoid: Co3Ge -> (εCo) + βCo5Ge3 | Co3Ge: Ge 0.22; (εCo): Ge 0.168; βCo5Ge3: Ge 0.348 | model | [1] Ansara 1991 | Table 1, p. 5, row 11; `ORC-6O2QVUHLKZ` |  |
| 923 | eutectoid: Co3Ge -> ε(Co) + βCo5Ge3 | Co3Ge: Ge 0.22; ε(Co): Ge 0.168; βCo5Ge3: Ge 0.348 | model | [3] Dong 2013; _cites Ishida 1991_ [doi](https://doi.org/10.1007/bf02663679) | Table 7, p. 6, row 23; `ORC-LXY675N32C` |  |
| 920 | eutectoid: Co3Ge \<-> ε(Co) + Co2Ge | Co3Ge: Ge 0.248; ε(Co): Ge 0.129; Co2Ge: Ge 0.333 | model | [2] Zeng 2019 | Table 2, p. 3, row 38; `ORC-MAOPSJNLN7` |  |
| 912 | peritectoid: ε(Co) + βCo5Ge3 -> Co5Ge2 | ε(Co): Ge 0.175; βCo5Ge3: Ge 0.363; Co5Ge2: Ge 0.286 | model | [3] Dong 2013 | Table 7, p. 6, row 26; `ORC-SN7E43XHE4` |  |
| 909.15 | peritectoid: (εCo) + βCo5Ge3 -> Co5Ge2 | (εCo): Ge 0.167; βCo5Ge3: Ge 0.286; Co5Ge2: Ge 0.35 | model | [1] Ansara 1991 | Table 1, p. 5, row 12; `ORC-CK7IKYHOTO` |  |
| 909 | peritectoid: Co3Ge + βCo5Ge3 \<-> Co2Ge | Co3Ge: Ge 0.25; βCo5Ge3: Ge 0.347; Co2Ge: Ge 0.333 | model | [2] Zeng 2019 | Table 2, p. 3, row 35; `ORC-27VHU3HNX5` |  |
| 909 | peritectoid: ε(Co) + βCo5Ge3 -> Co5Ge2 | ε(Co): Ge 0.167; βCo5Ge3: Ge 0.35; Co5Ge2: Ge 0.286 | model | [3] Dong 2013; _cites Ishida 1991_ [doi](https://doi.org/10.1007/bf02663679) | Table 7, p. 6, row 25; `ORC-YPKHVYZOUT` |  |
| 901 | eutectoid: Co3Ge \<-> ε(Co) + Co2Ge | Co3Ge: Ge 0.25; ε(Co): Ge 0.157; Co2Ge: Ge 0.333 | model | [2] Zeng 2019 | Table 2, p. 3, row 37; `ORC-ZCMHM6DFBR` |  |
| 656 | eutectoid: Co5Ge2 -> ε(Co) + βCo5Ge3 | Co5Ge2: Ge 0.286; ε(Co): Ge 0.153; βCo5Ge3: Ge 0.388 | model | [3] Dong 2013 | Table 7, p. 6, row 27; `ORC-RDKB36FT5H` |  |
| 655.15 | eutectoid: Co5Ge2 -> (εCo) + (αCo5Ge3) | Co5Ge2: Ge 0.286; (εCo): Ge 0.16; (αCo5Ge3): Ge 0.365 | model | [1] Ansara 1991 | Table 1, p. 5, row 14; `ORC-5ONNIZ6RTM` |  |
| 655 | peritectoid: ε(Co) + βCo5Ge3 -> αCo5G3 | ε(Co): Ge 0.153; βCo5Ge3: Ge 0.388; αCo5G3: Ge 0.375 | model | [3] Dong 2013 | Table 7, p. 6, row 28; `ORC-64YOAATZBU` |  |

## 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, Co–Ge system (55)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| CoGe |  | -22.758 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 24; `ORC-CICQFE5A6P` |  |
| CoGe |  | -21.847 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 23; `ORC-WDVUJQJRF2` |  |
| CoGe | [CoGe](https://data.orchid-project.org/compounds/CoGe.html) | -21.752 kJ/mol-atom | 1060 | model | -20.979 (mp-aaaabfkv) | -22.291 (oqmd-1790918) | [3] Dong 2013 | Table 6, p. 5, row 16; `ORC-D7F2OB6EBY.18a828` |  |
| CoGe | [CoGe](https://data.orchid-project.org/compounds/CoGe.html) | -21.394 kJ/mol-atom | 298.15 | model | -20.979 (mp-aaaabfkv) | -22.291 (oqmd-1790918) | [3] Dong 2013 | Table 5, p. 4, row 5; `ORC-634G6ECVIM.dc9396` |  |
| CoGe | [CoGe](https://data.orchid-project.org/compounds/CoGe.html) | -20.991 kJ/mol-atom | 298.15 | model | -20.979 (mp-aaaabfkv) | -22.291 (oqmd-1790918) | [3] Dong 2013 | Table 5, p. 4, row 5; `ORC-634G6ECVIM.9c1e99` |  |
| CoGe | [CoGe](https://data.orchid-project.org/compounds/CoGe.html) | -15.943 kJ/mol-atom | 1060 | experimental | -20.979 (mp-aaaabfkv) | -22.291 (oqmd-1790918) | [3] Dong 2013; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 6, p. 5, row 15; `ORC-FXF2ISUFL6.7ee8ff` |  |
| CoGe |  | -15.943 per mol-atom ± 946 | 1060 | experimental |  |  | [2] Zeng 2019; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 4, p. 9, row 22; `ORC-U2ZV5GWIH7` |  |
| CoGe2 |  | -16.579 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 27; `ORC-V4JEAVCDBH` |  |
| CoGe2 |  | -16.241 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 26; `ORC-JDB74JE4NI` |  |
| CoGe2 | [CoGe2](https://data.orchid-project.org/compounds/CoGe2.html) | -15.836 kJ/mol-atom | 1060 | model | -14.777 (mp-aaaabslp) | -15.207 (oqmd-647051) | [3] Dong 2013 | Table 6, p. 5, row 18; `ORC-QYAMFPHEDD.021f28` |  |
| CoGe2 | [CoGe2](https://data.orchid-project.org/compounds/CoGe2.html) | -15.343 kJ/mol-atom | 298.15 | model | -14.777 (mp-aaaabslp) | -15.207 (oqmd-647051) | [3] Dong 2013 | Table 5, p. 4, row 3; `ORC-7HQXRCMFMX.39316b` |  |
| CoGe2 | [CoGe2](https://data.orchid-project.org/compounds/CoGe2.html) | -14.874 kJ/mol-atom | 298.15 | model | -14.777 (mp-aaaabslp) | -15.207 (oqmd-647051) | [3] Dong 2013 | Table 5, p. 4, row 3; `ORC-7HQXRCMFMX.92fc5e` |  |
| CoGe2 |  | -11.8 per mol-atom ± 1274 | 1060 | experimental |  |  | [2] Zeng 2019; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 4, p. 9, row 25; `ORC-WBQKMFM4AK` |  |
| CoGe2 | [CoGe2](https://data.orchid-project.org/compounds/CoGe2.html) | -11.8 kJ/mol-atom | 1060 | experimental | -14.777 (mp-aaaabslp) | -15.207 (oqmd-647051) | [3] Dong 2013; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 6, p. 5, row 17; `ORC-WD3AEKSWBM.b8df31` |  |
| α(Co) |  | -4.022 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 8; `ORC-V4G6ONW2OA` |  |
| α(Co) |  | -3.914 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 9; `ORC-YTHRA26RAU` |  |
| α(Co) |  | -3.252 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 5; `ORC-F4UDTUG46A` |  |
| α(Co) |  | -3.176 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 6; `ORC-TGM4VEXG47` |  |
| α(Co) |  | -2.797 kJ/mol-atom | 1060 | model |  |  | [3] Dong 2013 | Table 6, p. 5, row 6; `ORC-DTHDMEIJ2G.3540fe` |  |
| α(Co) |  | -2.448 kJ/mol-atom | 1060 | model |  |  | [3] Dong 2013 | Table 6, p. 5, row 4; `ORC-LIQPM7GI4N.a6cda5` |  |
| α(Co) |  | -2.355 per mol-atom ± 701 | 1060 | experimental |  |  | [2] Zeng 2019; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 4, p. 9, row 7; `ORC-FR2QIXD6CZ` |  |
| α(Co) |  | -2.355 kJ/mol-atom | 1060 | experimental |  |  | [3] Dong 2013; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 6, p. 5, row 5; `ORC-WNDHR77EMG.29ac49` |  |
| α(Co) |  | -1.969 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 2; `ORC-FVMWI4LGAW` |  |
| α(Co) |  | -1.927 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 3; `ORC-IHHZYR3V7G` |  |
| α(Co) |  | -1.71 kJ/mol-atom | 1060 | experimental |  |  | [3] Dong 2013; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 6, p. 5, row 3; `ORC-DH24IJ4UJ2.2622de` |  |
| α(Co) |  | -1.71 per mol-atom ± 223 | 1060 | experimental |  |  | [2] Zeng 2019; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 4, p. 9, row 4; `ORC-DZ43JDWIXE` |  |
| α(Co) |  | -1.327 kJ/mol-atom | 1060 | model |  |  | [3] Dong 2013 | Table 6, p. 5, row 2; `ORC-FQXFNNES72.2eed20` |  |
| α(Co) |  | -1.089 per mol-atom ± 149 | 1060 | experimental |  |  | [2] Zeng 2019; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 4, p. 9, row 1; `ORC-CXRM5OLOAZ` |  |
| α(Co) |  | -1.089 kJ/mol-atom | 1060 | experimental |  |  | [3] Dong 2013; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 6, p. 5, row 1; `ORC-MLODMPC55R.2c3f06` |  |
| α(Co) + βCo5Ge3 |  | -15.844 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 12; `ORC-BMYCYGBQDR.069693` |  |
| α(Co) + βCo5Ge3 |  | -13.797 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 11; `ORC-NMON2TIR4J.266298` |  |
| α(Co) + βCo5Ge3 |  | -13.697 per mol-atom ± 870 | 1060 | experimental |  |  | [2] Zeng 2019; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 4, p. 9, row 10; `ORC-CHVOY6D4FJ.52fe1d` |  |
| α(Co) + βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -13.697 kJ/mol-atom | 1060 | experimental |  | -16.532 (oqmd-1437178) | [3] Dong 2013; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 6, p. 5, row 7; `ORC-FA37UICRO3.85f7a0` |  |
| α(Co) + βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -13.161 kJ/mol-atom | 1060 | model |  | -16.532 (oqmd-1437178) | [3] Dong 2013 | Table 6, p. 5, row 8; `ORC-XYYZTH6FP3.b6e438` |  |
| α(Co)+βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -15.844 kJ/mol-atom | 1060 | model |  | -16.532 (oqmd-1437178) | [2] Zeng 2019 | Table 4, p. 9, row 12; `ORC-BMYCYGBQDR.89ab1c` |  |
| α(Co)+βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -13.797 kJ/mol-atom | 1060 | model |  | -16.532 (oqmd-1437178) | [2] Zeng 2019 | Table 4, p. 9, row 11; `ORC-NMON2TIR4J.28f8d1` |  |
| α(Co)+βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -13.697 kJ/mol-atom ± 0.87 | 1060 | experimental |  | -16.532 (oqmd-1437178) | [2] Zeng 2019; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 4, p. 9, row 10; `ORC-CHVOY6D4FJ.422766` |  |
| βCo5Ge3 |  | -20.136 per mol-atom ± 1179 | 1060 | experimental |  |  | [2] Zeng 2019; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 4, p. 9, row 19; `ORC-HK277PMNPF` |  |
| βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -20.136 kJ/mol-atom | 1060 | experimental |  | -16.532 (oqmd-1437178) | [3] Dong 2013; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 6, p. 5, row 13; `ORC-P62OT55WGM.a4f7c5` |  |
| βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -19.6 kJ/mol-atom | 298.15 | experimental |  | -16.532 (oqmd-1437178) | [3] Dong 2013; _cites Kleppa 1990_ | Table 5, p. 4, row 6; `ORC-WO5NCPE2ZL` |  |
| βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -19 kJ/mol-atom | 298.15 | experimental |  | -16.532 (oqmd-1437178) | [3] Dong 2013; _cites Niessen 1983_ [doi](https://doi.org/10.1016/0364-5916%2883%2990030-5) | Table 5, p. 4, row 7; `ORC-RWT7INYSDC` |  |
| βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -18.665 kJ/mol-atom | 1060 | model |  | -16.532 (oqmd-1437178) | [3] Dong 2013 | Table 6, p. 5, row 14; `ORC-5NJEWCWNC2.1361f8` |  |
| βCo5Ge3 |  | -18.381 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 18; `ORC-KMHVYDGSGY` |  |
| βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -18.279 kJ/mol-atom | 298.15 | model |  | -16.532 (oqmd-1437178) | [3] Dong 2013 | Table 5, p. 4, row 8; `ORC-HFLXAPW2FJ` |  |
| βCo5Ge3 |  | -18.16 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 20; `ORC-BI3CA3YJAE` |  |
| βCo5Ge3 |  | -17.237 per mol-atom ± 845 | 1060 | experimental |  |  | [2] Zeng 2019; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 4, p. 9, row 16; `ORC-BENJKGUNBT` |  |
| βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -17.237 kJ/mol-atom | 1060 | experimental |  | -16.532 (oqmd-1437178) | [3] Dong 2013; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 6, p. 5, row 11; `ORC-IHZ76MZO3S.11ba75` |  |
| βCo5Ge3 |  | -17.185 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 15; `ORC-VJ2NFR57EC` |  |
| βCo5Ge3 |  | -16.665 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 17; `ORC-26PVPAMFY3` |  |
| βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -16.171 kJ/mol-atom | 1060 | model |  | -16.532 (oqmd-1437178) | [3] Dong 2013 | Table 6, p. 5, row 12; `ORC-4J432QRD3D.600041` |  |
| βCo5Ge3 |  | -15.868 per mol-atom ± 1104 | 1060 | experimental |  |  | [2] Zeng 2019; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 4, p. 9, row 13; `ORC-6GRTNSMMVO` |  |
| βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -15.868 kJ/mol-atom | 1060 | experimental |  | -16.532 (oqmd-1437178) | [3] Dong 2013; _cites Predel 1979_ [doi](https://doi.org/10.1016/0040-6031%2879%2985054-6) | Table 6, p. 5, row 9; `ORC-XUZS2XSLKO.41f725` |  |
| βCo5Ge3 |  | -15.124 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 14; `ORC-P6IPDZO6T5` |  |
| βCo5Ge3 | [Co5Ge3](https://data.orchid-project.org/compounds/Co5Ge3.html) | -14.314 kJ/mol-atom | 1060 | model |  | -16.532 (oqmd-1437178) | [3] Dong 2013 | Table 6, p. 5, row 10; `ORC-WMXZFAXV4H.148fdd` |  |
| βCo5Ge3 |  | -10.994 per mol-atom | 1060 | model |  |  | [2] Zeng 2019 | Table 4, p. 9, row 21; `ORC-J6GYZIWRSH` |  |

## Other properties

### Phase transition (2)

Table: Phase transition, Co–Ge system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1482 K | 1482 | congruent melting: L -> βCo5Ge3; _L: Ge 0.383; βCo5Ge3: Ge 0.383_ | model | [3] Dong 2013 | Table 7, p. 6, row 2; `ORC-SKSTNIJJQU` |  |
| Phase transition | 1483 K | 1483 | congruent melting: L -> βCo5Ge3; _L: Ge 0.375; βCo5Ge3: Ge 0.375_ | model | [3] Dong 2013; _cites Ishida 1991_ [doi](https://doi.org/10.1007/bf02663679) | Table 7, p. 6, row 1; `ORC-OOKL4BCRG6` |  |

### Crystal structure (17)

Table: Crystal structure, Co–Ge system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a; _printed: a_ | 11.57 Å | 298.15 | CoGe; _alloy: Ge 0.5_ | model | [3] Dong 2013 | Table 5, p. 4, row 5; `ORC-GXSK5RGFWJ.e343d6` |  |
| Lattice a; _printed: a_ | 11.684 Å | 298.15 | CoGe; _alloy: Ge 0.5_ | experimental | [3] Dong 2013; _cites Bhan 1960_ | Table 5, p. 4, row 4; `ORC-WXD6WSEXCE.095b70` |  |
| Lattice a; _printed: a_ | 5.65 Å | 298.15 | CoGe2; _alloy: Ge 0.666667_ | experimental | [3] Dong 2013; _cites Schubert 1950_ | Table 5, p. 4, row 2; `ORC-OCYGI2FRSA.0792fe` |  |
| Lattice a; _printed: a_ | 5.684 Å | 298.15 | CoGe2; _alloy: Ge 0.666667_ | model | [3] Dong 2013 | Table 5, p. 4, row 3; `ORC-WBYFYQ3UOX.bb407f` |  |
| Lattice a; _printed: a_ | 5.67 Å | 298.15 | CoGe2; _alloy: Ge 0.666667_ | experimental | [3] Dong 2013; _cites Schubert 1950_ | Table 5, p. 4, row 1; `ORC-XCMDD4UCJ2.791502` |  |
| Lattice b; _printed: b_ | 3.766 Å | 298.15 | CoGe; _alloy: Ge 0.5_ | model | [3] Dong 2013 | Table 5, p. 4, row 5; `ORC-GXSK5RGFWJ.042dd1` |  |
| Lattice b; _printed: b_ | 3.807 Å | 298.15 | CoGe; _alloy: Ge 0.5_ | experimental | [3] Dong 2013; _cites Bhan 1960_ | Table 5, p. 4, row 4; `ORC-WXD6WSEXCE.37e393` |  |
| Lattice b; _printed: b_ | 5.65 Å | 298.15 | CoGe2; _alloy: Ge 0.666667_ | experimental | [3] Dong 2013; _cites Schubert 1950_ | Table 5, p. 4, row 2; `ORC-OCYGI2FRSA.463a1b` |  |
| Lattice b; _printed: b_ | 5.682 Å | 298.15 | CoGe2; _alloy: Ge 0.666667_ | model | [3] Dong 2013 | Table 5, p. 4, row 3; `ORC-WBYFYQ3UOX.c87bad` |  |
| Lattice b; _printed: b_ | 5.67 Å | 298.15 | CoGe2; _alloy: Ge 0.666667_ | experimental | [3] Dong 2013; _cites Schubert 1950_ | Table 5, p. 4, row 1; `ORC-XCMDD4UCJ2.a4ec92` |  |
| Lattice c; _printed: c_ | 4.934 Å | 298.15 | CoGe; _alloy: Ge 0.5_ | model | [3] Dong 2013 | Table 5, p. 4, row 5; `ORC-GXSK5RGFWJ.99a76a` |  |
| Lattice c; _printed: c_ | 4.945 Å | 298.15 | CoGe; _alloy: Ge 0.5_ | experimental | [3] Dong 2013; _cites Bhan 1960_ | Table 5, p. 4, row 4; `ORC-WXD6WSEXCE.a0fe60` |  |
| Lattice c; _printed: c_ | 10.8 Å | 298.15 | CoGe2; _alloy: Ge 0.666667_ | experimental | [3] Dong 2013; _cites Schubert 1950_ | Table 5, p. 4, row 2; `ORC-OCYGI2FRSA.ea40e1` |  |
| Lattice c; _printed: c_ | 10.94 Å | 298.15 | CoGe2; _alloy: Ge 0.666667_ | model | [3] Dong 2013 | Table 5, p. 4, row 3; `ORC-WBYFYQ3UOX.e2843a` |  |
| Lattice c; _printed: c_ | 10.796 Å | 298.15 | CoGe2; _alloy: Ge 0.666667_ | experimental | [3] Dong 2013; _cites Schubert 1950_ | Table 5, p. 4, row 1; `ORC-XCMDD4UCJ2.6f403c` |  |
| lattice unspecified axis; _printed: β_ | 99.6 ° | 298.15 | CoGe; _alloy: Ge 0.5_ | model | [3] Dong 2013 | Table 5, p. 4, row 5; `ORC-GXSK5RGFWJ.028e09` |  |
| lattice unspecified axis; _printed: β_ | 101.1 ° | 298.15 | CoGe; _alloy: Ge 0.5_ | experimental | [3] Dong 2013; _cites Bhan 1960_ | Table 5, p. 4, row 4; `ORC-WXD6WSEXCE.8e1c58` |  |

## Sources

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

1. I Ansara, F Ajersch, The Ga-Pb (Gallium-Lead) System, JPE 12, 73-77 (1991). [doi:10.1007/bf02663678](https://doi.org/10.1007/bf02663678)
2. Yinping Zeng, Yong Du, Han Li, Peng Zhou, Shuhong Liu, Kaiming Cheng et al., Thermodynamic description and solidified microstructure of the Co-Ge system, Journal of Alloys and Compounds 793, 480-491 (2019). [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205)
3. S.S. Dong, S.G. Liu, X.M. Tao, F.H. Xiao, L.H. Huang, F. Yang et al., Thermodynamic optimization of Co–Ge binary system, Thermochimica Acta 572, 94-100 (2013). [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026)

## 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/).