# Co–Ge phases

> Co–Ge system: 15 phases (tier A 7, tier C 4, liquid 1, needs_review 3); 14 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references.

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

15 phases (tier A 7, tier C 4, liquid 1, needs_review 3); 14 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: [interactive registry](https://orchid-project.org/phases/?q=CO-GE) · [full JSON](https://data.orchid-project.org/phases/systems/CO-GE.json) · [Co–Ge system page](https://data.orchid-project.org/systems/CO-GE.html) · [Markdown](https://data.orchid-project.org/phases/pages/CO-GE.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Co–Ge system (15)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [DIAMOND_A4](#phase-co-ge-a4-diamond); _phase:co-ge:a4-diamond_ | C (diamond) · A4 · cF8 · Fd-3m (227) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 300–1211.4 K, x(Ge) 1–1 | 10 | 4 |
| [BCC_A2](#phase-co-ge-bcc-a2); _phase:co-ge:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | not stable in 4 calculated diagram(s) | 0 | 4 |
| [CO2GE_C37](#phase-co-ge-co2ge-c37); _phase:co-ge:co2ge-c37_ | Co2Si · C37 · oP12 · Pnma (62) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–933.99 K, x(Ge) 0.33333–0.33333 | 4 | 2 |
| [CO3GE](#phase-co-ge-co3ge); _phase:co-ge:co3ge_ |  | needs_review | stable in 2 of 2 calculated diagram(s): 920–1060 K, x(Ge) 0.25–0.25 | 6 | 2 |
| [CO5GE2](#phase-co-ge-co5ge2); _phase:co-ge:co5ge2_ |  | needs_review | stable in 2 of 2 calculated diagram(s): 652.37–924.45 K, x(Ge) 0.28571–0.28571 | 5 | 2 |
| [CO5GE3](#phase-co-ge-co5ge3); _phase:co-ge:co5ge3_ | InNi2 · B8_2 · hP6 · P6_3/mmc (194) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1481.27 K, x(Ge) 0.375–0.375 | 5 | 1 |
| [CO5GE3_B82](#phase-co-ge-co5ge3-b82); _phase:co-ge:co5ge3-b82_ | InNi2 · B8_2 · hP6 · P6_3/mmc (194) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 300–1482.22 K, x(Ge) 0.33898–0.45007 | 58 | 3 |
| [CO5GE3_C37](#phase-co-ge-co5ge3-c37); _phase:co-ge:co5ge3-c37_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–655.66 K, x(Ge) 0.375–0.375 | 1 | 1 |
| [CO5GE7](#phase-co-ge-co5ge7); _phase:co-ge:co5ge7_ | Co5Ge7 · tI24 · I4mm (107) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 4 of 4 calculated diagram(s): 300–1119.77 K, x(Ge) 0.58333–0.58333 | 7 | 4 |
| [COGE](#phase-co-ge-coge); _phase:co-ge:coge_ | CoGe · mC16 · C2/m (12) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 4 of 4 calculated diagram(s): 300–1276.8 K, x(Ge) 0.48683–0.52883 | 42 | 4 |
| [COGE2](#phase-co-ge-coge2); _phase:co-ge:coge2_ | CoGe2 · oC24 · Cmce (64) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 4 of 4 calculated diagram(s): 300–1122.01 K, x(Ge) 0.66667–0.66667 | 44 | 4 |
| [FCC_A1](#phase-co-ge-fcc-a1); _phase:co-ge:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 687.99–1818.74 K, x(Ge) 0–0.17235 | 3 | 6 |
| [L12_FCC](#phase-co-ge-fcc-l12); _phase:co-ge:fcc-l12_ | AuCu3 · L1_2 · cP4 · Pm-3m (221) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 750–1730 K, x(Ge) 0.01–0.25008 | 7 | 2 |
| [HCP_A3](#phase-co-ge-hcp-a3); _phase:co-ge:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 300–1425.86 K, x(Ge) 0–0.20219 | 34 | 4 |
| [LIQUID](#phase-co-ge-liquid); _phase:co-ge:liquid_ | liquid | liquid | stable in 4 of 4 calculated diagram(s): 1087.69–2500 K, x(Ge) 0–1 | 53 | 4 |

## DIAMOND_A4 (Co–Ge)

- Id: `phase:co-ge:a4-diamond`; status `assigned`
- Structure: C (diamond) · A4 · cF8 · Fd-3m (227); type `st:a4-c-diamond-cf8`; tier A: standard phase name; confidence high
- Stoichiometry: Ge 1.0000
- Stability: stable in 4 of 4 calculated diagram(s): 300–1211.4 K, x(Ge) 1–1
- Literature: 10 values (10 accepted) from 3 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:a4-diamond)

Names (10): _corpus: _corpus:phase:co-ge:a4-diamond, corpus:phase:co-ge:diamond-a4  
_paper: _paper:10.1007/bf02663678:(Ge), paper:10.1007/bf02663678:Ge, paper:10.1016/j.jallcom.2018.12.205:(Ge), paper:10.1016/j.tca.2013.08.026:(Ge)  
_tdb: _tdb:CoGe-04Kor-LB.tdb:DIAMOND_A4, tdb:CoGe-13Don.tdb:DIAMOND_A4, tdb:CoGe-19Zen-ass.tdb:DIAMOND_A4, tdb:CoGe-19Zen-sub.tdb:DIAMOND_A4  


### TDB models of DIAMOND_A4 (4): PHASE and CONSTITUENT statements as written

[CoGe-04Kor-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb): DIAMOND_A4, type code %, sha256 `526f50de552aafad…`

~~~~text
44: PHASE DIAMOND_A4 % 1 1 !
45: CONST DIAMOND_A4 : GE : !
~~~~

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): DIAMOND_A4, type code %, sha256 `160f80fc562e4adc…`

~~~~text
47: PHASE DIAMOND_A4 % 1 1 !
48: CONST DIAMOND_A4 : GE : !
~~~~

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): DIAMOND_A4, type code %, sha256 `de75e3c47d8e84db…`

~~~~text
63: PHASE DIAMOND_A4 % 1 1 !
64: CONST DIAMOND_A4 : GE : !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): DIAMOND_A4, type code %, sha256 `2837674f94c2f661…`

~~~~text
59: PHASE DIAMOND_A4 % 1 1 !
60: CONST DIAMOND_A4 : GE : !
~~~~

Example references (7 of 7; assessments first): 

- [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02663678](https://doi.org/10.1007/bf02663678) I Ansara, F Ajersch, The Ga-Pb (Gallium-Lead) System, JPE 12, 73-77 (1991).  
_reports values for this phase_
- [doi:10.1007/bf02663679](https://doi.org/10.1007/bf02663679) K Ishida, T Nishizawa, The Co-Ge (Cobalt-Germanium) System, JPE 12, 77-83 (1991).  
_cited as the source of values for this phase_
- [doi:10.1007/s11669-017-0592-1](https://doi.org/10.1007/s11669-017-0592-1) Yinping Zeng, Han Li, Yong Du, Yafei Pan, Yingbiao Peng, Peng Zhou et al., Experimental Investigation of the Co-Ge Phase Diagram, J. Phase Equilib. Diffus. 38, 843-852 (2017).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(80)90252-0](https://doi.org/10.1016/0022-5088%2880%2990252-0) André Dayer, Pierre Feschotte, Les systèmes binaires cobalt-germanium et nickel-germanium: Étude comparée, Journal of the Less Common Metals 72, 51-70 (1980).  
_cited as the source of values for this phase_
- [doi:10.1515/ijmr-1949-401006](https://doi.org/10.1515/ijmr-1949-401006) H. Pfisterer, K. Schubert, Z. Metallkd. 40 (1949) 378–383.  
_cited as the source of values for this phase_

## BCC_A2 (Co–Ge)

- Id: `phase:co-ge:bcc-a2`; status `assigned`
- Structure: W · A2 · cI2 · Im-3m (229); type `st:a2-w-ci2`; tier A: standard phase name; confidence high
- Stability: not stable in 4 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:bcc-a2)

Names (5): _corpus: _corpus:phase:co-ge:bcc-a2  
_tdb: _tdb:CoGe-04Kor-LB.tdb:BCC_A2, tdb:CoGe-13Don.tdb:BCC_A2, tdb:CoGe-19Zen-ass.tdb:BCC_A2, tdb:CoGe-19Zen-sub.tdb:BCC_A2  


### TDB models of BCC_A2 (4): PHASE and CONSTITUENT statements as written

[CoGe-04Kor-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb): BCC_A2, type code %B, sha256 `526f50de552aafad…`

~~~~text
34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : CO GE : VA : !
~~~~

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): BCC_A2, type code %B, sha256 `160f80fc562e4adc…`

~~~~text
37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : CO GE : VA : !
~~~~

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): BCC_A2, type code %B, sha256 `de75e3c47d8e84db…`

~~~~text
53: PHASE BCC_A2 %B 2 1 3 !
54: CONST BCC_A2 : CO GE : VA : !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): BCC_A2, type code %B, sha256 `2837674f94c2f661…`

~~~~text
49: PHASE BCC_A2 %B 2 1 3 !
50: CONST BCC_A2 : CO GE : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) 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).  
_assessment that models this phase_
- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase_

## CO2GE_C37 (Co–Ge)

- Id: `phase:co-ge:co2ge-c37`; status `assigned`
- Structure: Co2Si · C37 · oP12 · Pnma (62); type `st:c37-co2si-op12`; tier A: standard phase name; confidence high
- Stoichiometry: Co 0.6667, Ge 0.3333
- Stability: stable in 2 of 2 calculated diagram(s): 300–933.99 K, x(Ge) 0.33333–0.33333
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:co2ge-c37)

Names (4): _corpus: _corpus:phase:co-ge:co2ge-c37  
_paper: _paper:10.1016/j.jallcom.2018.12.205:Co2Ge  
_tdb: _tdb:CoGe-19Zen-ass.tdb:CO2GE_C37, tdb:CoGe-19Zen-sub.tdb:CO2GE_C37  


### TDB models of CO2GE_C37 (2): PHASE and CONSTITUENT statements as written

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): CO2GE_C37, type code %, sha256 `de75e3c47d8e84db…`

~~~~text
68: PHASE CO2GE_C37 % 2 2 1 !
69: CONST CO2GE_C37 : CO : GE : !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): CO2GE_C37, type code %, sha256 `2837674f94c2f661…`

~~~~text
64: PHASE CO2GE_C37 % 2 2 1 !
65: CONST CO2GE_C37 : CO : GE : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) 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).  
_assessment that models this phase; reports values for this phase_

## CO3GE (Co–Ge)

- Id: `phase:co-ge:co3ge`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_mp; no_structure_token
- Candidate (dft_oqmd): Cmcm (63) — on-hull OQMD Co3 Ge1 at x(GE)=0.2500
- Candidate (literature_printed): Cr3Si · cP8 — printed with a label mapped to this phase
- Candidate (sgte_mmc2): Cr3Si · A15 · cP8 · Pm-3n (223) — Hallstedt 2025 mmc2 row for CO3GE: Co3Ge ?
- Candidate (tdb_comment): Cr3Si · cP8 · Pm-3n — CoGe-04Kor-LB.tdb: 'Prototype Cr3Si (cP8, Pm-3n) ?'
- Candidate (tdb_comment): Cr3Si · cP8 · Pm-3n — CoGe-13Don.tdb: 'Prototype Cr3Si (cP8, Pm-3n)'
- Stoichiometry: Co 0.7500, Ge 0.2500
- Stability: stable in 2 of 2 calculated diagram(s): 920–1060 K, x(Ge) 0.25–0.25
- Literature: 6 values (6 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:co3ge)

Names (5): _corpus: _corpus:phase:co-ge:co3ge  
_paper: _paper:10.1007/bf02663678:Co3Ge, paper:10.1016/j.tca.2013.08.026:Co3Ge  
_tdb: _tdb:CoGe-04Kor-LB.tdb:CO3GE, tdb:CoGe-13Don.tdb:CO3GE  


### TDB models of CO3GE (2): PHASE and CONSTITUENT statements as written

[CoGe-04Kor-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb): CO3GE, type code %, sha256 `526f50de552aafad…`

~~~~text
49: PHASE CO3GE % 2 3 1 !
50: CONST CO3GE : CO : GE : !
~~~~

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): CO3GE, type code %, sha256 `160f80fc562e4adc…`

~~~~text
52: PHASE CO3GE % 2 3 1 !
53: CONST CO3GE : CO : GE : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02663678](https://doi.org/10.1007/bf02663678) I Ansara, F Ajersch, The Ga-Pb (Gallium-Lead) System, JPE 12, 73-77 (1991).  
_reports values for this phase_
- [doi:10.1007/bf02663679](https://doi.org/10.1007/bf02663679) K Ishida, T Nishizawa, The Co-Ge (Cobalt-Germanium) System, JPE 12, 77-83 (1991).  
_cited as the source of values for this phase_

## CO5GE2 (Co–Ge)

- Id: `phase:co-ge:co5ge2`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (literature_printed): (Co5Ge2) · hP\* — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (Co5Ge2) — Hallstedt 2025 mmc2 row for CO5GE2: Co5Ge2
- Stoichiometry: Co 0.7143, Ge 0.2857
- Stability: stable in 2 of 2 calculated diagram(s): 652.37–924.45 K, x(Ge) 0.28571–0.28571
- Literature: 5 values (5 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:co5ge2)

Names (5): _corpus: _corpus:phase:co-ge:co5ge2  
_paper: _paper:10.1007/bf02663678:Co5Ge2, paper:10.1016/j.tca.2013.08.026:Co5Ge2  
_tdb: _tdb:CoGe-04Kor-LB.tdb:CO5GE2, tdb:CoGe-13Don.tdb:CO5GE2  


### TDB models of CO5GE2 (2): PHASE and CONSTITUENT statements as written

[CoGe-04Kor-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb): CO5GE2, type code %, sha256 `526f50de552aafad…`

~~~~text
54: PHASE CO5GE2 % 2 5 2 !
55: CONST CO5GE2 : CO : GE : !
~~~~

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): CO5GE2, type code %, sha256 `160f80fc562e4adc…`

~~~~text
57: PHASE CO5GE2 % 2 5 2 !
58: CONST CO5GE2 : CO : GE : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02663678](https://doi.org/10.1007/bf02663678) I Ansara, F Ajersch, The Ga-Pb (Gallium-Lead) System, JPE 12, 73-77 (1991).  
_reports values for this phase_
- [doi:10.1007/bf02663679](https://doi.org/10.1007/bf02663679) K Ishida, T Nishizawa, The Co-Ge (Cobalt-Germanium) System, JPE 12, 77-83 (1991).  
_cited as the source of values for this phase_

## CO5GE3 (Co–Ge)

- Id: `phase:co-ge:co5ge3`; status `assigned`
- Structure: InNi2 · B8_2 · hP6 · P6_3/mmc (194); type `st:b8-2-inni2-hp6`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_structure_token, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Co 0.6250, Ge 0.3750
- Stability: stable in 1 of 1 calculated diagram(s): 300–1481.27 K, x(Ge) 0.375–0.375
- Literature: 5 values (5 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:co5ge3)

Names (3): _corpus: _corpus:phase:co-ge:co5ge3  
_paper: _paper:10.1007/bf02663678:βCo5Ge3  
_tdb: _tdb:CoGe-04Kor-LB.tdb:CO5GE3  


### TDB models of CO5GE3 (1): PHASE and CONSTITUENT statements as written

[CoGe-04Kor-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb): CO5GE3, type code %, sha256 `526f50de552aafad…`

~~~~text
60: PHASE CO5GE3 % 2 5 3 !
61: CONST CO5GE3 : CO : GE : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1007/bf02663678](https://doi.org/10.1007/bf02663678) I Ansara, F Ajersch, The Ga-Pb (Gallium-Lead) System, JPE 12, 73-77 (1991).  
_reports values for this phase_

## CO5GE3_B82 (Co–Ge)

- Id: `phase:co-ge:co5ge3-b82`; status `assigned`
- Structure: InNi2 · B8_2 · hP6 · P6_3/mmc (194); type `st:b8-2-inni2-hp6`; tier A: standard phase name; confidence high
- Stability: stable in 3 of 3 calculated diagram(s): 300–1482.22 K, x(Ge) 0.33898–0.45007
- Literature: 58 values (58 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:co5ge3-b82)

Names (6): _corpus: _corpus:phase:co-ge:co5ge3-b82  
_paper: _paper:10.1016/j.jallcom.2018.12.205:βCo5Ge3, paper:10.1016/j.tca.2013.08.026:βCo5Ge3  
_tdb: _tdb:CoGe-13Don.tdb:CO5GE3_B82, tdb:CoGe-19Zen-ass.tdb:CO5GE3_B82, tdb:CoGe-19Zen-sub.tdb:CO5GE3_B82  


### TDB models of CO5GE3_B82 (3): PHASE and CONSTITUENT statements as written

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): CO5GE3_B82, type code %, sha256 `160f80fc562e4adc…`

~~~~text
67: PHASE CO5GE3_B82 % 3 1 4 3 !
68: CONST CO5GE3_B82 : CO VA : CO : CO GE% : !
~~~~

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): CO5GE3_B82, type code %, sha256 `de75e3c47d8e84db…`

~~~~text
73: PHASE CO5GE3_B82 % 3 1 1 1 !
74: CONST CO5GE3_B82 : CO : CO VA : GE : !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): CO5GE3_B82, type code %, sha256 `2837674f94c2f661…`

~~~~text
69: PHASE CO5GE3_B82 % 3 1 1 1 !
70: CONST CO5GE3_B82 : CO : CO VA : GE : !
~~~~

Example references (9 of 9; assessments first): 

- [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0040-6031(79)85054-6](https://doi.org/10.1016/0040-6031%2879%2985054-6) Bruno Predel, Wolfgang Vogelbein, Bildungsenthalpien fester legierungen der binären systeme des eisens, kobalts und nickels mit germanium und zinn, Thermochimica Acta 30, 201-215 (1979).  
_cited as the source of values for this phase_
- [doi:10.1007/bf02663679](https://doi.org/10.1007/bf02663679) K Ishida, T Nishizawa, The Co-Ge (Cobalt-Germanium) System, JPE 12, 77-83 (1991).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(80)90252-0](https://doi.org/10.1016/0022-5088%2880%2990252-0) André Dayer, Pierre Feschotte, Les systèmes binaires cobalt-germanium et nickel-germanium: Étude comparée, Journal of the Less Common Metals 72, 51-70 (1980).  
_cited as the source of values for this phase_
- [doi:10.1007/s11669-017-0592-1](https://doi.org/10.1007/s11669-017-0592-1) Yinping Zeng, Han Li, Yong Du, Yafei Pan, Yingbiao Peng, Peng Zhou et al., Experimental Investigation of the Co-Ge Phase Diagram, J. Phase Equilib. Diffus. 38, 843-852 (2017).  
_cited as the source of values for this phase_
- [doi:10.1515/ijmr-1949-401006](https://doi.org/10.1515/ijmr-1949-401006) H. Pfisterer, K. Schubert, Z. Metallkd. 40 (1949) 378–383.  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(90)90117-3](https://doi.org/10.1016/0022-5088%2890%2990117-3) H. Enoki, K. Ishida, T. Nishizawa, Phase equilibria in cobalt-rich portions of the Co-Si and Co-Ge systems, Journal of the Less Common Metals 160, 153-160 (1990).  
_cited as the source of values for this phase_
- [doi:10.1016/0364-5916(83)90030-5](https://doi.org/10.1016/0364-5916%2883%2990030-5) A.K. Niessen, F.R. de Boer, R. Boom, P.F. de Chatel, W.C.M. Mattens, A.R. Miedema, CALPHAD 7 (1983) 51–70.  
_cited as the source of values for this phase_

## CO5GE3_C37 (Co–Ge)

- Id: `phase:co-ge:co5ge3-c37`; status `needs_review`
- No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_C37; stoichiometry_contradicts_C37:CoGe-13Don.tdb
- Candidate (name_token): Co2Si · C37 · oP12 · Pnma (62) — Strukturbericht/word 'C37' in the TDB name
- Candidate (sgte_mmc2): Co2Si · C37 · oP12 · Pnma (62) — Hallstedt 2025 mmc2 row for CO5GE3_C37: alpha-Co5Ge3
- Candidate (tdb_comment): Co2Si · oP12 · Pnma — CoGe-13Don.tdb: 'Prototype Co2Si (oP12, Pnma)'
- Stoichiometry: Co 0.6250, Ge 0.3750
- Stability: stable in 1 of 1 calculated diagram(s): 300–655.66 K, x(Ge) 0.375–0.375
- Literature: 1 values (1 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:co5ge3-c37)

Names (3): _corpus: _corpus:phase:co-ge:co5ge3-c37  
_paper: _paper:10.1016/j.tca.2013.08.026:αCo5G3  
_tdb: _tdb:CoGe-13Don.tdb:CO5GE3_C37  


### TDB models of CO5GE3_C37 (1): PHASE and CONSTITUENT statements as written

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): CO5GE3_C37, type code %, sha256 `160f80fc562e4adc…`

~~~~text
62: PHASE CO5GE3_C37 % 2 5 3 !
63: CONST CO5GE3_C37 : CO : GE : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase; reports values for this phase_

## CO5GE7 (Co–Ge)

- Id: `phase:co-ge:co5ge7`; status `assigned`
- Structure: Co5Ge7 · tI24 · I4mm (107); type `st:co5ge7-ti24`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Co 0.4167, Ge 0.5833
- Stability: stable in 4 of 4 calculated diagram(s): 300–1119.77 K, x(Ge) 0.58333–0.58333
- Literature: 7 values (7 accepted) from 3 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:co5ge7)

Names (8): _corpus: _corpus:phase:co-ge:co5ge7  
_paper: _paper:10.1007/bf02663678:Co5Ge7, paper:10.1016/j.jallcom.2018.12.205:Co5Ge7, paper:10.1016/j.tca.2013.08.026:Co5Ge7  
_tdb: _tdb:CoGe-04Kor-LB.tdb:CO5GE7, tdb:CoGe-13Don.tdb:CO5GE7, tdb:CoGe-19Zen-ass.tdb:CO5GE7, tdb:CoGe-19Zen-sub.tdb:CO5GE7  


### TDB models of CO5GE7 (4): PHASE and CONSTITUENT statements as written

[CoGe-04Kor-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb): CO5GE7, type code %, sha256 `526f50de552aafad…`

~~~~text
70: PHASE CO5GE7 % 2 5 7 !
71: CONST CO5GE7 : CO : GE : !
~~~~

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): CO5GE7, type code %, sha256 `160f80fc562e4adc…`

~~~~text
77: PHASE CO5GE7 % 2 5 7 !
78: CONST CO5GE7 : CO : GE : !
~~~~

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): CO5GE7, type code %, sha256 `de75e3c47d8e84db…`

~~~~text
83: PHASE CO5GE7 % 2 5 7 !
84: CONST CO5GE7 : CO : GE : !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): CO5GE7, type code %, sha256 `2837674f94c2f661…`

~~~~text
79: PHASE CO5GE7 % 2 5 7 !
80: CONST CO5GE7 : CO : GE : !
~~~~

Example references (6 of 6; assessments first): 

- [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02663678](https://doi.org/10.1007/bf02663678) I Ansara, F Ajersch, The Ga-Pb (Gallium-Lead) System, JPE 12, 73-77 (1991).  
_reports values for this phase_
- [doi:10.1007/bf02663679](https://doi.org/10.1007/bf02663679) K Ishida, T Nishizawa, The Co-Ge (Cobalt-Germanium) System, JPE 12, 77-83 (1991).  
_cited as the source of values for this phase_
- [doi:10.1007/s11669-017-0592-1](https://doi.org/10.1007/s11669-017-0592-1) Yinping Zeng, Han Li, Yong Du, Yafei Pan, Yingbiao Peng, Peng Zhou et al., Experimental Investigation of the Co-Ge Phase Diagram, J. Phase Equilib. Diffus. 38, 843-852 (2017).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(80)90252-0](https://doi.org/10.1016/0022-5088%2880%2990252-0) André Dayer, Pierre Feschotte, Les systèmes binaires cobalt-germanium et nickel-germanium: Étude comparée, Journal of the Less Common Metals 72, 51-70 (1980).  
_cited as the source of values for this phase_

## COGE (Co–Ge)

- Id: `phase:co-ge:coge`; status `assigned`
- Structure: CoGe · mC16 · C2/m (12); type `st:coge-mc16`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
- Stability: stable in 4 of 4 calculated diagram(s): 300–1276.8 K, x(Ge) 0.48683–0.52883
- Literature: 42 values (39 accepted) from 3 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:coge)

Names (8): _corpus: _corpus:phase:co-ge:coge  
_paper: _paper:10.1007/bf02663678:CoGe, paper:10.1016/j.jallcom.2018.12.205:CoGe, paper:10.1016/j.tca.2013.08.026:CoGe  
_tdb: _tdb:CoGe-04Kor-LB.tdb:COGE, tdb:CoGe-13Don.tdb:COGE, tdb:CoGe-19Zen-ass.tdb:COGE, tdb:CoGe-19Zen-sub.tdb:COGE  


### TDB models of COGE (4): PHASE and CONSTITUENT statements as written

[CoGe-04Kor-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb): COGE, type code %, sha256 `526f50de552aafad…`

~~~~text
65: PHASE COGE % 2 1 1 !
66: CONST COGE : CO : GE : !
~~~~

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): COGE, type code %, sha256 `160f80fc562e4adc…`

~~~~text
72: PHASE COGE % 2 1 1 !
73: CONST COGE : CO% GE : CO GE% : !
~~~~

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): COGE, type code %, sha256 `de75e3c47d8e84db…`

~~~~text
78: PHASE COGE % 2 1 1 !
79: CONST COGE : CO% GE : CO GE% : !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): COGE, type code %, sha256 `2837674f94c2f661…`

~~~~text
74: PHASE COGE % 2 1 1 !
75: CONST COGE : CO% GE : CO GE% : !
~~~~

Example references (8 of 8; assessments first): 

- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase; cited as the source of values for this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02663678](https://doi.org/10.1007/bf02663678) I Ansara, F Ajersch, The Ga-Pb (Gallium-Lead) System, JPE 12, 73-77 (1991).  
_reports values for this phase_
- [doi:10.1007/bf02663679](https://doi.org/10.1007/bf02663679) K Ishida, T Nishizawa, The Co-Ge (Cobalt-Germanium) System, JPE 12, 77-83 (1991).  
_cited as the source of values for this phase_
- [doi:10.1007/s11669-017-0592-1](https://doi.org/10.1007/s11669-017-0592-1) Yinping Zeng, Han Li, Yong Du, Yafei Pan, Yingbiao Peng, Peng Zhou et al., Experimental Investigation of the Co-Ge Phase Diagram, J. Phase Equilib. Diffus. 38, 843-852 (2017).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(80)90252-0](https://doi.org/10.1016/0022-5088%2880%2990252-0) André Dayer, Pierre Feschotte, Les systèmes binaires cobalt-germanium et nickel-germanium: Étude comparée, Journal of the Less Common Metals 72, 51-70 (1980).  
_cited as the source of values for this phase_
- [doi:10.1016/0040-6031(79)85054-6](https://doi.org/10.1016/0040-6031%2879%2985054-6) Bruno Predel, Wolfgang Vogelbein, Bildungsenthalpien fester legierungen der binären systeme des eisens, kobalts und nickels mit germanium und zinn, Thermochimica Acta 30, 201-215 (1979).  
_cited as the source of values for this phase_
- [doi:10.1515/ijmr-1949-401006](https://doi.org/10.1515/ijmr-1949-401006) H. Pfisterer, K. Schubert, Z. Metallkd. 40 (1949) 378–383.  
_cited as the source of values for this phase_

## COGE2 (Co–Ge)

- Id: `phase:co-ge:coge2`; status `assigned`
- Structure: CoGe2 · oC24 · Cmce (64); type `st:coge2-oc24`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (dft_space_group_64_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Co 0.3333, Ge 0.6667
- Stability: stable in 4 of 4 calculated diagram(s): 300–1122.01 K, x(Ge) 0.66667–0.66667
- Literature: 44 values (41 accepted) from 3 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:coge2)

Names (8): _corpus: _corpus:phase:co-ge:coge2  
_paper: _paper:10.1007/bf02663678:CoGe2, paper:10.1016/j.jallcom.2018.12.205:CoGe2, paper:10.1016/j.tca.2013.08.026:CoGe2  
_tdb: _tdb:CoGe-04Kor-LB.tdb:COGE2, tdb:CoGe-13Don.tdb:COGE2, tdb:CoGe-19Zen-ass.tdb:COGE2, tdb:CoGe-19Zen-sub.tdb:COGE2  


### TDB models of COGE2 (4): PHASE and CONSTITUENT statements as written

[CoGe-04Kor-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb): COGE2, type code %, sha256 `526f50de552aafad…`

~~~~text
75: PHASE COGE2 % 2 1 2 !
76: CONST COGE2 : CO : GE : !
~~~~

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): COGE2, type code %, sha256 `160f80fc562e4adc…`

~~~~text
82: PHASE COGE2 % 2 1 2 !
83: CONST COGE2 : CO : GE : !
~~~~

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): COGE2, type code %, sha256 `de75e3c47d8e84db…`

~~~~text
88: PHASE COGE2 % 2 1 2 !
89: CONST COGE2 : CO : GE : !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): COGE2, type code %, sha256 `2837674f94c2f661…`

~~~~text
84: PHASE COGE2 % 2 1 2 !
85: CONST COGE2 : CO : GE : !
~~~~

Example references (9 of 9; assessments first): 

- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase; cited as the source of values for this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02663678](https://doi.org/10.1007/bf02663678) I Ansara, F Ajersch, The Ga-Pb (Gallium-Lead) System, JPE 12, 73-77 (1991).  
_reports values for this phase_
- [doi:10.1007/bf02663679](https://doi.org/10.1007/bf02663679) K Ishida, T Nishizawa, The Co-Ge (Cobalt-Germanium) System, JPE 12, 77-83 (1991).  
_cited as the source of values for this phase_
- [doi:10.1007/s11669-017-0592-1](https://doi.org/10.1007/s11669-017-0592-1) Yinping Zeng, Han Li, Yong Du, Yafei Pan, Yingbiao Peng, Peng Zhou et al., Experimental Investigation of the Co-Ge Phase Diagram, J. Phase Equilib. Diffus. 38, 843-852 (2017).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(80)90252-0](https://doi.org/10.1016/0022-5088%2880%2990252-0) André Dayer, Pierre Feschotte, Les systèmes binaires cobalt-germanium et nickel-germanium: Étude comparée, Journal of the Less Common Metals 72, 51-70 (1980).  
_cited as the source of values for this phase_
- [doi:10.1524/zkri.1956.107.1-2.99](https://doi.org/10.1524/zkri.1956.107.1-2.99) Erwin Hellner, Flußspat-Misch-Typen\<sup>1\</sup>, Zeitschrift für Kristallographie 107, 99-123 (1956).  
_cited as the source of values for this phase_
- [doi:10.1016/0040-6031(79)85054-6](https://doi.org/10.1016/0040-6031%2879%2985054-6) Bruno Predel, Wolfgang Vogelbein, Bildungsenthalpien fester legierungen der binären systeme des eisens, kobalts und nickels mit germanium und zinn, Thermochimica Acta 30, 201-215 (1979).  
_cited as the source of values for this phase_
- [doi:10.1515/ijmr-1949-401006](https://doi.org/10.1515/ijmr-1949-401006) H. Pfisterer, K. Schubert, Z. Metallkd. 40 (1949) 378–383.  
_cited as the source of values for this phase_

## FCC_A1 (Co–Ge)

- Id: `phase:co-ge:fcc-a1`; status `assigned`
- Structure: Cu · A1 · cF4 · Fm-3m (225); type `st:a1-cu-cf4`; tier A: standard phase name; confidence high
- Stability: stable in 4 of 4 calculated diagram(s): 687.99–1818.74 K, x(Ge) 0–0.17235
- Literature: 3 values (3 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:fcc-a1)

Names (8): _corpus: _corpus:phase:co-ge:fcc-a1  
_paper: _paper:10.1016/j.tca.2013.08.026:α(Co)  
_tdb: _tdb:CoGe-04Kor-LB.tdb:FCC_A1, tdb:CoGe-13Don.tdb:FCC_A1, tdb:CoGe-19Zen-ass.tdb:A1_FCC, tdb:CoGe-19Zen-ass.tdb:FCC_A1, tdb:CoGe-19Zen-sub.tdb:A1_FCC, tdb:CoGe-19Zen-sub.tdb:FCC_A1  


### TDB models of FCC_A1 (6): PHASE and CONSTITUENT statements as written

[CoGe-04Kor-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb): FCC_A1, type code %A, sha256 `526f50de552aafad…`

~~~~text
29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : CO% GE : VA : !
~~~~

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): FCC_A1, type code %A, sha256 `160f80fc562e4adc…`

~~~~text
32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : CO% GE : VA : !
~~~~

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): A1_FCC, type code %A, sha256 `de75e3c47d8e84db…`

~~~~text
43: PHASE A1_FCC %A 2 1 1 !
44: CONST A1_FCC : CO% GE : VA : !
~~~~

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): FCC_A1, type code %A, sha256 `de75e3c47d8e84db…`

~~~~text
38: PHASE FCC_A1 %A 2 1 1 !
39: CONST FCC_A1 : CO% GE : VA : !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): A1_FCC, type code %A, sha256 `2837674f94c2f661…`

~~~~text
39: PHASE A1_FCC %A 2 1 1 !
40: CONST A1_FCC : CO% GE : VA : !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): FCC_A1, type code %A, sha256 `2837674f94c2f661…`

~~~~text
34: PHASE FCC_A1 %A 2 1 1 !
35: CONST FCC_A1 : CO% GE : VA : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) 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).  
_assessment that models this phase_
- [doi:10.1007/bf02663679](https://doi.org/10.1007/bf02663679) K Ishida, T Nishizawa, The Co-Ge (Cobalt-Germanium) System, JPE 12, 77-83 (1991).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(90)90117-3](https://doi.org/10.1016/0022-5088%2890%2990117-3) H. Enoki, K. Ishida, T. Nishizawa, Phase equilibria in cobalt-rich portions of the Co-Si and Co-Ge systems, Journal of the Less Common Metals 160, 153-160 (1990).  
_cited as the source of values for this phase_

## L12_FCC (Co–Ge)

- Id: `phase:co-ge:fcc-l12`; status `assigned`
- Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type `st:l1-2-aucu3-cp4`; tier A: standard phase name; confidence high
- Caveat: CoGe-19Zen-ass.tdb: ordered phase with disordered part A1_FCC (order/disorder model)
- Caveat: CoGe-19Zen-sub.tdb: ordered phase with disordered part A1_FCC (order/disorder model)
- Caveat: partitioned order/disorder model in CoGe-19Zen-ass.tdb also describes the disordered state
- Caveat: partitioned order/disorder model in CoGe-19Zen-sub.tdb also describes the disordered state
- Stability: stable in 2 of 2 calculated diagram(s): 750–1730 K, x(Ge) 0.01–0.25008
- Literature: 7 values (7 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:fcc-l12)

Names (4): _corpus: _corpus:phase:co-ge:fcc-l12  
_paper: _paper:10.1016/j.jallcom.2018.12.205:Co3Ge  
_tdb: _tdb:CoGe-19Zen-ass.tdb:L12_FCC, tdb:CoGe-19Zen-sub.tdb:L12_FCC  


### TDB models of L12_FCC (2): PHASE and CONSTITUENT statements as written

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): L12_FCC, type code %AY, sha256 `de75e3c47d8e84db…`

~~~~text
48: PHASE L12_FCC %AY 3 0.75 0.25 1 !
49: CONST L12_FCC : CO% GE : CO GE% : VA :  !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): L12_FCC, type code %AY, sha256 `2837674f94c2f661…`

~~~~text
44: PHASE L12_FCC %AY 3 0.75 0.25 1 !
45: CONST L12_FCC : CO% GE : CO GE% : VA :  !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(80)90252-0](https://doi.org/10.1016/0022-5088%2880%2990252-0) André Dayer, Pierre Feschotte, Les systèmes binaires cobalt-germanium et nickel-germanium: Étude comparée, Journal of the Less Common Metals 72, 51-70 (1980).  
_cited as the source of values for this phase_

## HCP_A3 (Co–Ge)

- Id: `phase:co-ge:hcp-a3`; status `assigned`
- Structure: Mg · A3 · hP2 · P6_3/mmc (194); type `st:a3-mg-hp2`; tier A: standard phase name; confidence high
- Stability: stable in 4 of 4 calculated diagram(s): 300–1425.86 K, x(Ge) 0–0.20219
- Literature: 34 values (34 accepted) from 3 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:hcp-a3)

Names (8): _corpus: _corpus:phase:co-ge:hcp-a3  
_paper: _paper:10.1007/bf02663678:(εCo), paper:10.1016/j.jallcom.2018.12.205:ε(Co), paper:10.1016/j.tca.2013.08.026:ε(Co)  
_tdb: _tdb:CoGe-04Kor-LB.tdb:HCP_A3, tdb:CoGe-13Don.tdb:HCP_A3, tdb:CoGe-19Zen-ass.tdb:HCP_A3, tdb:CoGe-19Zen-sub.tdb:HCP_A3  


### TDB models of HCP_A3 (4): PHASE and CONSTITUENT statements as written

[CoGe-04Kor-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb): HCP_A3, type code %A, sha256 `526f50de552aafad…`

~~~~text
39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : CO% GE : VA : !
~~~~

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): HCP_A3, type code %A, sha256 `160f80fc562e4adc…`

~~~~text
42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : CO% GE : VA : !
~~~~

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): HCP_A3, type code %A, sha256 `de75e3c47d8e84db…`

~~~~text
58: PHASE HCP_A3 %A 2 1 0.5 !
59: CONST HCP_A3 : CO% GE : VA : !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): HCP_A3, type code %A, sha256 `2837674f94c2f661…`

~~~~text
54: PHASE HCP_A3 %A 2 1 0.5 !
55: CONST HCP_A3 : CO% GE : VA : !
~~~~

Example references (8 of 8; assessments first): 

- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02663678](https://doi.org/10.1007/bf02663678) I Ansara, F Ajersch, The Ga-Pb (Gallium-Lead) System, JPE 12, 73-77 (1991).  
_reports values for this phase_
- [doi:10.1007/bf02663679](https://doi.org/10.1007/bf02663679) K Ishida, T Nishizawa, The Co-Ge (Cobalt-Germanium) System, JPE 12, 77-83 (1991).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(80)90252-0](https://doi.org/10.1016/0022-5088%2880%2990252-0) André Dayer, Pierre Feschotte, Les systèmes binaires cobalt-germanium et nickel-germanium: Étude comparée, Journal of the Less Common Metals 72, 51-70 (1980).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(90)90117-3](https://doi.org/10.1016/0022-5088%2890%2990117-3) H. Enoki, K. Ishida, T. Nishizawa, Phase equilibria in cobalt-rich portions of the Co-Si and Co-Ge systems, Journal of the Less Common Metals 160, 153-160 (1990).  
_cited as the source of values for this phase_
- [doi:10.1007/s11669-017-0592-1](https://doi.org/10.1007/s11669-017-0592-1) Yinping Zeng, Han Li, Yong Du, Yafei Pan, Yingbiao Peng, Peng Zhou et al., Experimental Investigation of the Co-Ge Phase Diagram, J. Phase Equilib. Diffus. 38, 843-852 (2017).  
_cited as the source of values for this phase_
- [doi:10.1515/ijmr-1949-401006](https://doi.org/10.1515/ijmr-1949-401006) H. Pfisterer, K. Schubert, Z. Metallkd. 40 (1949) 378–383.  
_cited as the source of values for this phase_

## LIQUID (Co–Ge)

- Id: `phase:co-ge:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 4 of 4 calculated diagram(s): 1087.69–2500 K, x(Ge) 0–1
- Literature: 53 values (53 accepted) from 3 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-ge:liquid)

Names (8): _corpus: _corpus:phase:co-ge:liquid  
_paper: _paper:10.1007/bf02663678:L, paper:10.1016/j.jallcom.2018.12.205:L, paper:10.1016/j.tca.2013.08.026:L  
_tdb: _tdb:CoGe-04Kor-LB.tdb:LIQUID, tdb:CoGe-13Don.tdb:LIQUID, tdb:CoGe-19Zen-ass.tdb:LIQUID, tdb:CoGe-19Zen-sub.tdb:LIQUID  


### TDB models of LIQUID (4): PHASE and CONSTITUENT statements as written

[CoGe-04Kor-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-04Kor-LB.tdb): LIQUID, type code %, sha256 `526f50de552aafad…`

~~~~text
24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : CO GE : !
~~~~

[CoGe-13Don.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-13Don.tdb): LIQUID, type code %, sha256 `160f80fc562e4adc…`

~~~~text
27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : CO GE : !
~~~~

[CoGe-19Zen-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-ass.tdb): LIQUID, type code %, sha256 `de75e3c47d8e84db…`

~~~~text
33: PHASE LIQUID:L % 1 1 !
34: CONST LIQUID:L : CO COGE GE : !
~~~~

[CoGe-19Zen-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGe-19Zen-sub.tdb): LIQUID, type code %, sha256 `2837674f94c2f661…`

~~~~text
29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : CO GE : !
~~~~

Example references (8 of 8; assessments first): 

- [doi:10.1016/j.jallcom.2018.12.205](https://doi.org/10.1016/j.jallcom.2018.12.205) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.tca.2013.08.026](https://doi.org/10.1016/j.tca.2013.08.026) 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).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1007/bf02663678](https://doi.org/10.1007/bf02663678) I Ansara, F Ajersch, The Ga-Pb (Gallium-Lead) System, JPE 12, 73-77 (1991).  
_reports values for this phase_
- [doi:10.1007/bf02663679](https://doi.org/10.1007/bf02663679) K Ishida, T Nishizawa, The Co-Ge (Cobalt-Germanium) System, JPE 12, 77-83 (1991).  
_cited as the source of values for this phase_
- [doi:10.1007/s11669-017-0592-1](https://doi.org/10.1007/s11669-017-0592-1) Yinping Zeng, Han Li, Yong Du, Yafei Pan, Yingbiao Peng, Peng Zhou et al., Experimental Investigation of the Co-Ge Phase Diagram, J. Phase Equilib. Diffus. 38, 843-852 (2017).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(80)90252-0](https://doi.org/10.1016/0022-5088%2880%2990252-0) André Dayer, Pierre Feschotte, Les systèmes binaires cobalt-germanium et nickel-germanium: Étude comparée, Journal of the Less Common Metals 72, 51-70 (1980).  
_cited as the source of values for this phase_
- [doi:10.1515/ijmr-1949-401006](https://doi.org/10.1515/ijmr-1949-401006) H. Pfisterer, K. Schubert, Z. Metallkd. 40 (1949) 378–383.  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(90)90117-3](https://doi.org/10.1016/0022-5088%2890%2990117-3) H. Enoki, K. Ishida, T. Nishizawa, Phase equilibria in cobalt-rich portions of the Co-Si and Co-Ge systems, Journal of the Less Common Metals 160, 153-160 (1990).  
_cited as the source of values for this phase_

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735970
- 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 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); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work).

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_phase_registry_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Registry: phase registry of binary systems}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735970},
  url       = {https://doi.org/10.5281/zenodo.23735970},
  note      = {Version 1, machine-extracted}
}

@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 the ORCHID phase registry and the sources named on the page (TDB assessments, Hallstedt 2025, Materials Project, OQMD). TDB statements are quoted as written; parameter expressions are not reproduced. Field reference: [SCHEMA.md](https://data.orchid-project.org/phases/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt).