# Co–Y phases

> Co–Y system: 15 phases (tier A 6, tier C 3, liquid 1, needs_review 5); 15 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-Y.html · Markdown: https://data.orchid-project.org/phases/pages/CO-Y.md

15 phases (tier A 6, tier C 3, liquid 1, needs_review 5); 15 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-Y) · [full JSON](https://data.orchid-project.org/phases/systems/CO-Y.json) · [Co–Y system page](https://data.orchid-project.org/systems/CO-Y.html) · [Markdown](https://data.orchid-project.org/phases/pages/CO-Y.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Co–Y system (15)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-co-y-bcc-a2); _phase:co-y:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 1751.15–2499.99 K, x(Y) 0.99783–1 | 4 | 4 |
| [CO17Y2](#phase-co-y-co17y2); _phase:co-y:co17y2_ |  | needs_review | stable in 4 of 4 calculated diagram(s): 300–1638.55 K, x(Y) 0.09531–0.16361 | 14 | 4 |
| [CO2Y_C15](#phase-co-y-co2y-c15); _phase:co-y:co2y-c15_ | Cu2Mg · C15 · cF24 · Fd-3m (227) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 300–1426.96 K, x(Y) 0.33333–0.33333 | 8 | 4 |
| [CO3Y](#phase-co-y-co3y); _phase:co-y:co3y_ |  | needs_review | stable in 4 of 4 calculated diagram(s): 300–1580.83 K, x(Y) 0.25–0.25 | 8 | 4 |
| [CO3Y2](#phase-co-y-co3y2); _phase:co-y:co3y2_ |  | needs_review | stable in 4 of 4 calculated diagram(s): 300–1143.83 K, x(Y) 0.4–0.4 | 12 | 4 |
| [CO3Y4](#phase-co-y-co3y4); _phase:co-y:co3y4_ | Co3Ho4 · hP22 · P6_3/m (176) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 4 of 4 calculated diagram(s): 300–1007.11 K, x(Y) 0.57143–0.57143 | 4 | 4 |
| [CO5Y_D2D](#phase-co-y-co5y-d2d); _phase:co-y:co5y-d2d_ | CaCu5 · D2_d · hP6 · P6/mmm (191) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 968.12–1628.09 K, x(Y) 0.14909–0.17516 | 6 | 3 |
| [CO5Y8](#phase-co-y-co5y8); _phase:co-y:co5y8_ | Co5Y8 · mP52 · P2_1/c (14) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 4 of 4 calculated diagram(s): 300–1022.39 K, x(Y) 0.61538–0.61538 | 12 | 4 |
| [CO7Y2](#phase-co-y-co7y2); _phase:co-y:co7y2_ | Co7Gd2 · hR18 · R-3m (166) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 4 of 4 calculated diagram(s): 300–1593.04 K, x(Y) 0.22222–0.22222 | 10 | 4 |
| [CO7Y6](#phase-co-y-co7y6); _phase:co-y:co7y6_ |  | needs_review | stable in 4 of 4 calculated diagram(s): 300–1049.19 K, x(Y) 0.46154–0.46154 | 4 | 4 |
| [COY_B33](#phase-co-y-coy-b33); _phase:co-y:coy-b33_ |  | needs_review | stable in 4 of 4 calculated diagram(s): 300–1077.67 K, x(Y) 0.5–0.5 | 24 | 4 |
| [COY3_D011](#phase-co-y-coy3-d011); _phase:co-y:coy3-d011_ | Fe3C · D0_11 · oP16 · Pnma (62) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 300–1168.59 K, x(Y) 0.75–0.75 | 8 | 4 |
| [FCC_A1](#phase-co-y-fcc-a1); _phase:co-y:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 639.99–1773.03 K, x(Y) 0–0.00095 | 8 | 4 |
| [HCP_A3](#phase-co-y-hcp-a3); _phase:co-y:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 300–1752.54 K, x(Y) 0–1 | 8 | 4 |
| [LIQUID](#phase-co-y-liquid); _phase:co-y:liquid_ | liquid | liquid | stable in 4 of 4 calculated diagram(s): 1011.35–2500 K, x(Y) 0–1 | 52 | 4 |

## BCC_A2 (Co–Y)

- Id: `phase:co-y:bcc-a2`; status `assigned`
- Structure: W · A2 · cI2 · Im-3m (229); type `st:a2-w-ci2`; tier A: standard phase name; confidence high
- Stability: stable in 4 of 4 calculated diagram(s): 1751.15–2499.99 K, x(Y) 0.99783–1
- Literature: 4 values (4 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:bcc-a2)

Names (7): _corpus: _corpus:phase:co-y:bcc-a2  
_paper: _paper:10.1016/j.jallcom.2003.10.050:bcc(Y), paper:10.1016/j.jallcom.2005.06.037:β-Y  
_tdb: _tdb:CoY-04Du-LB.tdb:BCC_A2, tdb:CoY-06Gol.tdb:BCC_A2, tdb:CoY-21Wan.tdb:BCC_A2, tdb:CoY-96Du.tdb:BCC_A2  


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

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): BCC_A2, type code %B, sha256 `054ec0f14cb5cb4c…`

~~~~text
38: PHASE BCC_A2 %B 2 1 3 !
39: CONST BCC_A2 : CO Y% : VA : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): BCC_A2, type code %B, sha256 `aac7ff05f1475e50…`

~~~~text
46: PHASE BCC_A2 %B 2 1 3 !
47: CONST BCC_A2 : CO Y% : VA : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): BCC_A2, type code %B, sha256 `2ca9bae471245666…`

~~~~text
39: PHASE BCC_A2 %B 2 1 3 !
40: CONST BCC_A2 : CO Y% : VA : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): BCC_A2, type code %B, sha256 `fdf8036fa6e999e0…`

~~~~text
33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : CO Y% : VA : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_
- [doi:10.1016/s0168-1273(86)08004-2](https://doi.org/10.1016/s0168-1273%2886%2908004-2) K.A. Gschneidner, F.W. Calderwood, Chapter 54 Intra rare earth binary alloys: Phase relationships, lattice parameters and systematics, Handbook on the Physics and Chemistry of Rare Earths, 1-161 (1986).  
_cited as the source of values for this phase_

## CO17Y2 (Co–Y)

- Id: `phase:co-y:co17y2`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model; sgte_mmc2_rows_disagree
- Candidate (dft_mp): R-3m (166) — on-hull MP Y2Co17 at x(Y)=0.1053
- Candidate (dft_oqmd): R-3m (166) — on-hull OQMD Co17 Y2 at x(Y)=0.1053
- Candidate (literature_printed): CaCu5 · hP6 — printed with a label mapped to this phase
- Candidate (sgte_mmc2): CaCu5 · D2_d · hP6 · P6/mmm (191) — Hallstedt 2025 mmc2 row for CO17Y2: Co5Y, see also Th2Zn17 and Ni17Th2
- Candidate (sgte_mmc2): Ni17Th2 · hP38 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for CO17Y2: Co17Y2 (high T), see also Th2Zn17 and CaCu5
- Candidate (sgte_mmc2): Th2Zn17 · hR19 · R-3m (166) — Hallstedt 2025 mmc2 row for CO17Y2: Co17Y2 (low T), see also Ni17Th2 and CaCu5
- Candidate (tdb_comment): CaCu5 · hP6 · P6/mmm, D2_d — CoY-04Du-LB.tdb: 'Prototype CaCu5 (hP6, P6/mmm, D2_d), Co5Y'
- Candidate (tdb_comment): Ni17Th2 · hP38 · P6_3/mmc — CoY-04Du-LB.tdb: 'Prototype Ni17Th2 (hP38, P6_3/mmc), beta-Co17Y2'
- Stability: stable in 4 of 4 calculated diagram(s): 300–1638.55 K, x(Y) 0.09531–0.16361
- Literature: 14 values (14 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:co17y2)

Names (8): _corpus: _corpus:phase:co-y:co17y2  
_paper: _paper:10.1016/j.jallcom.2003.10.050:Co17Y2, paper:10.1016/j.jallcom.2003.10.050:Co5Y, paper:10.1016/j.jallcom.2005.06.037:Co17Y2  
_tdb: _tdb:CoY-04Du-LB.tdb:CO17Y2, tdb:CoY-06Gol.tdb:CO17Y2, tdb:CoY-21Wan.tdb:CO17Y2, tdb:CoY-96Du.tdb:CO17Y2  


### TDB models of CO17Y2 (4): PHASE and CONSTITUENT statements as written

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): CO17Y2, type code %A, sha256 `054ec0f14cb5cb4c…`

~~~~text
50: PHASE CO17Y2 %A 3 1 2 15 !
51: CONST CO17Y2 : CO2 Y : CO2 Y : CO : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): CO17Y2, type code %A, sha256 `aac7ff05f1475e50…`

~~~~text
57: PHASE CO17Y2 %A 3 1 2 15 !
58: CONST CO17Y2 : CO2 Y : CO2 Y : CO : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): CO17Y2, type code %A, sha256 `2ca9bae471245666…`

~~~~text
50: PHASE CO17Y2 %A 3 1 2 15 !
51: CONST CO17Y2 : CO2 Y : CO2 Y : CO : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): CO17Y2, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
44: PHASE CO17Y2 % 2 17 2 !
45: CONST CO17Y2 : CO : Y : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_
- [doi:10.1007/bf02670324](https://doi.org/10.1007/bf02670324) P. R. Subramanian, J. F. Smith, Thermodynamics of formation of Y-Co alloys, Metall Trans A 16, 1195-1201 (1985).  
_cited as the source of values for this phase_

## CO2Y_C15 (Co–Y)

- Id: `phase:co-y:co2y-c15`; status `assigned`
- Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type `st:c15-cu2mg-cf24`; tier A: standard phase name; confidence high
- Stoichiometry: Co 0.6667, Y 0.3333
- Stability: stable in 4 of 4 calculated diagram(s): 300–1426.96 K, x(Y) 0.33333–0.33333
- Literature: 8 values (8 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:co2y-c15)

Names (7): _corpus: _corpus:phase:co-y:co2y-c15  
_paper: _paper:10.1016/j.jallcom.2003.10.050:Co2Y, paper:10.1016/j.jallcom.2005.06.037:Co2Y  
_tdb: _tdb:CoY-04Du-LB.tdb:CO2Y_C15, tdb:CoY-06Gol.tdb:CO2Y_C15, tdb:CoY-21Wan.tdb:CO2Y_C15, tdb:CoY-96Du.tdb:CO2Y_C15  


### TDB models of CO2Y_C15 (4): PHASE and CONSTITUENT statements as written

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): CO2Y_C15, type code %A, sha256 `054ec0f14cb5cb4c…`

~~~~text
65: PHASE CO2Y_C15 %A 2 2 1 !
66: CONST CO2Y_C15 : CO : Y : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): CO2Y_C15, type code %, sha256 `aac7ff05f1475e50…`

~~~~text
77: PHASE CO2Y_C15 % 2 2 1 !
78: CONST CO2Y_C15 : CO : Y : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): CO2Y_C15, type code %, sha256 `2ca9bae471245666…`

~~~~text
70: PHASE CO2Y_C15 % 2 2 1 !
71: CONST CO2Y_C15 : CO : Y : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): CO2Y_C15, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
64: PHASE CO2Y_C15 % 2 2 1 !
65: CONST CO2Y_C15 : CO : Y : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_

## CO3Y (Co–Y)

- Id: `phase:co-y:co3y`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_rows_disagree
- Candidate (literature_printed): CeNi3 · hP24 — printed with a label mapped to this phase
- Candidate (sgte_mmc2): CeNi3 · hP24 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for CO3Y: Co3Y, see also Ni3Pu
- Candidate (sgte_mmc2): Ni3Pu · hR12 · R-3m (166) — Hallstedt 2025 mmc2 row for CO3Y: Co3Y, see also CeNi3
- Candidate (tdb_comment): Ni3Pu · hR12 · R-3m — CoY-04Du-LB.tdb: 'Prototype Ni3Pu (hR12, R-3m) or CeNi3 (hP24, P6_3/mmc)'
- Candidate (tdb_comment): Ni3Pu · hR12 · R-3m — CoY-06Gol.tdb: 'Prototype Ni3Pu (hR12, R-3m) or CeNi3 (hP24, P6_3/mmc)'
- Candidate (tdb_comment): Ni3Pu · hR12 · R-3m — CoY-21Wan.tdb: 'Prototype Ni3Pu (hR12, R-3m) or CeNi3 (hP24, P6_3/mmc)'
- Candidate (tdb_comment): Ni3Pu · hR12 · R-3m — CoY-96Du.tdb: 'Prototype Ni3Pu (hR12, R-3m) or CeNi3 (hP24, P6_3/mmc)'
- Stoichiometry: Co 0.7500, Y 0.2500
- Stability: stable in 4 of 4 calculated diagram(s): 300–1580.83 K, x(Y) 0.25–0.25
- Literature: 8 values (8 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:co3y)

Names (7): _corpus: _corpus:phase:co-y:co3y  
_paper: _paper:10.1016/j.jallcom.2003.10.050:Co3Y, paper:10.1016/j.jallcom.2005.06.037:Co3Y  
_tdb: _tdb:CoY-04Du-LB.tdb:CO3Y, tdb:CoY-06Gol.tdb:CO3Y, tdb:CoY-21Wan.tdb:CO3Y, tdb:CoY-96Du.tdb:CO3Y  


### TDB models of CO3Y (4): PHASE and CONSTITUENT statements as written

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): CO3Y, type code %A, sha256 `054ec0f14cb5cb4c…`

~~~~text
60: PHASE CO3Y %A 2 3 1 !
61: CONST CO3Y : CO : Y : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): CO3Y, type code %, sha256 `aac7ff05f1475e50…`

~~~~text
72: PHASE CO3Y % 2 3 1 !
73: CONST CO3Y : CO : Y : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): CO3Y, type code %, sha256 `2ca9bae471245666…`

~~~~text
65: PHASE CO3Y % 2 3 1 !
66: CONST CO3Y : CO : Y : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): CO3Y, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
59: PHASE CO3Y % 2 3 1 !
60: CONST CO3Y : CO : Y : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_

## CO3Y2 (Co–Y)

- Id: `phase:co-y:co3y2`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (literature_printed): (Co3Y2) · cP\* — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (Co3Y2) — Hallstedt 2025 mmc2 row for CO3Y2: Co3Y2
- Stoichiometry: Co 0.6000, Y 0.4000
- Stability: stable in 4 of 4 calculated diagram(s): 300–1143.83 K, x(Y) 0.4–0.4
- Literature: 12 values (12 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:co3y2)

Names (7): _corpus: _corpus:phase:co-y:co3y2  
_paper: _paper:10.1016/j.jallcom.2003.10.050:Co3Y2, paper:10.1016/j.jallcom.2005.06.037:Co3Y2  
_tdb: _tdb:CoY-04Du-LB.tdb:CO3Y2, tdb:CoY-06Gol.tdb:CO3Y2, tdb:CoY-21Wan.tdb:CO3Y2, tdb:CoY-96Du.tdb:CO3Y2  


### TDB models of CO3Y2 (4): PHASE and CONSTITUENT statements as written

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): CO3Y2, type code %, sha256 `054ec0f14cb5cb4c…`

~~~~text
70: PHASE CO3Y2 % 2 3 2 !
71: CONST CO3Y2 : CO : Y : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): CO3Y2, type code %, sha256 `aac7ff05f1475e50…`

~~~~text
82: PHASE CO3Y2 % 2 3 2 !
83: CONST CO3Y2 : CO : Y : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): CO3Y2, type code %, sha256 `2ca9bae471245666…`

~~~~text
75: PHASE CO3Y2 % 2 3 2 !
76: CONST CO3Y2 : CO : Y : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): CO3Y2, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
69: PHASE CO3Y2 % 2 3 2 !
70: CONST CO3Y2 : CO : Y : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_

## CO3Y4 (Co–Y)

- Id: `phase:co-y:co3y4`; status `assigned`
- Structure: Co3Ho4 · hP22 · P6_3/m (176); type `st:co3ho4-hp22`; 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 0.4286, Y 0.5714
- Stability: stable in 4 of 4 calculated diagram(s): 300–1007.11 K, x(Y) 0.57143–0.57143
- Literature: 4 values (4 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:co3y4)

Names (7): _corpus: _corpus:phase:co-y:co3y4  
_paper: _paper:10.1016/j.jallcom.2003.10.050:Co3Y4, paper:10.1016/j.jallcom.2005.06.037:Co3Y4  
_tdb: _tdb:CoY-04Du-LB.tdb:CO3Y4, tdb:CoY-06Gol.tdb:CO3Y4, tdb:CoY-21Wan.tdb:CO3Y4, tdb:CoY-96Du.tdb:CO3Y4  


### TDB models of CO3Y4 (4): PHASE and CONSTITUENT statements as written

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): CO3Y4, type code %, sha256 `054ec0f14cb5cb4c…`

~~~~text
85: PHASE CO3Y4 % 2 3 4 !
86: CONST CO3Y4 : CO : Y : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): CO3Y4, type code %, sha256 `aac7ff05f1475e50…`

~~~~text
97: PHASE CO3Y4 % 2 3 4 !
98: CONST CO3Y4 : CO : Y : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): CO3Y4, type code %, sha256 `2ca9bae471245666…`

~~~~text
90: PHASE CO3Y4 % 2 3 4 !
91: CONST CO3Y4 : CO : Y : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): CO3Y4, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
84: PHASE CO3Y4 % 2 3 4 !
85: CONST CO3Y4 : CO : Y : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_

## CO5Y_D2D (Co–Y)

- Id: `phase:co-y:co5y-d2d`; status `assigned`
- Structure: CaCu5 · D2_d · hP6 · P6/mmm (191); type `st:d2-d-cacu5-hp6`; tier A: standard phase name; confidence high
- Stability: stable in 3 of 3 calculated diagram(s): 968.12–1628.09 K, x(Y) 0.14909–0.17516
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:co5y-d2d)

Names (5): _corpus: _corpus:phase:co-y:co5y-d2d  
_paper: _paper:10.1016/j.jallcom.2005.06.037:Co5Y  
_tdb: _tdb:CoY-06Gol.tdb:CO5Y_D2D, tdb:CoY-21Wan.tdb:CO5Y_D2D, tdb:CoY-96Du.tdb:CO5Y_D2D  


### TDB models of CO5Y_D2D (3): PHASE and CONSTITUENT statements as written

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): CO5Y_D2D, type code %A, sha256 `aac7ff05f1475e50…`

~~~~text
62: PHASE CO5Y_D2D %A 3 1 4 1 !
63: CONST CO5Y_D2D : CO2 Y : CO : CO VA : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): CO5Y_D2D, type code %A, sha256 `2ca9bae471245666…`

~~~~text
55: PHASE CO5Y_D2D %A 3 1 4 1 !
56: CONST CO5Y_D2D : CO2 Y : CO : CO VA : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): CO5Y_D2D, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
49: PHASE CO5Y_D2D % 2 5 1 !
50: CONST CO5Y_D2D : CO : Y : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_

## CO5Y8 (Co–Y)

- Id: `phase:co-y:co5y8`; status `assigned`
- Structure: Co5Y8 · mP52 · P2_1/c (14); type `st:co5y8-mp52`; 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 0.3846, Y 0.6154
- Stability: stable in 4 of 4 calculated diagram(s): 300–1022.39 K, x(Y) 0.61538–0.61538
- Literature: 12 values (12 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:co5y8)

Names (7): _corpus: _corpus:phase:co-y:co5y8  
_paper: _paper:10.1016/j.jallcom.2003.10.050:Co5Y8, paper:10.1016/j.jallcom.2005.06.037:Co5Y8  
_tdb: _tdb:CoY-04Du-LB.tdb:CO5Y8, tdb:CoY-06Gol.tdb:CO5Y8, tdb:CoY-21Wan.tdb:CO5Y8, tdb:CoY-96Du.tdb:CO5Y8  


### TDB models of CO5Y8 (4): PHASE and CONSTITUENT statements as written

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): CO5Y8, type code %, sha256 `054ec0f14cb5cb4c…`

~~~~text
90: PHASE CO5Y8 % 2 5 8 !
91: CONST CO5Y8 : CO : Y : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): CO5Y8, type code %, sha256 `aac7ff05f1475e50…`

~~~~text
102: PHASE CO5Y8 % 2 5 8 !
103: CONST CO5Y8 : CO : Y : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): CO5Y8, type code %, sha256 `2ca9bae471245666…`

~~~~text
95: PHASE CO5Y8 % 2 5 8 !
96: CONST CO5Y8 : CO : Y : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): CO5Y8, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
89: PHASE CO5Y8 % 2 5 8 !
90: CONST CO5Y8 : CO : Y : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_
- [doi:10.1016/0022-5088(82)90186-2](https://doi.org/10.1016/0022-5088%2882%2990186-2) A.K. Grover, B.R. Coles, B.V.B. Sarkissian, H.E.N. Stone, The Y-Co system: a partial phase diagram study, Journal of the Less Common Metals 86, 29-36 (1982).  
_cited as the source of values for this phase_

## CO7Y2 (Co–Y)

- Id: `phase:co-y:co7y2`; status `assigned`
- Structure: Co7Gd2 · hR18 · R-3m (166); type `st:co7gd2-hr18`; 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 0.7778, Y 0.2222
- Stability: stable in 4 of 4 calculated diagram(s): 300–1593.04 K, x(Y) 0.22222–0.22222
- Literature: 10 values (10 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:co7y2)

Names (7): _corpus: _corpus:phase:co-y:co7y2  
_paper: _paper:10.1016/j.jallcom.2003.10.050:Co7Y2, paper:10.1016/j.jallcom.2005.06.037:Co7Y2  
_tdb: _tdb:CoY-04Du-LB.tdb:CO7Y2, tdb:CoY-06Gol.tdb:CO7Y2, tdb:CoY-21Wan.tdb:CO7Y2, tdb:CoY-96Du.tdb:CO7Y2  


### TDB models of CO7Y2 (4): PHASE and CONSTITUENT statements as written

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): CO7Y2, type code %A, sha256 `054ec0f14cb5cb4c…`

~~~~text
55: PHASE CO7Y2 %A 2 7 2 !
56: CONST CO7Y2 : CO : Y : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): CO7Y2, type code %, sha256 `aac7ff05f1475e50…`

~~~~text
67: PHASE CO7Y2 % 2 7 2 !
68: CONST CO7Y2 : CO : Y : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): CO7Y2, type code %, sha256 `2ca9bae471245666…`

~~~~text
60: PHASE CO7Y2 % 2 7 2 !
61: CONST CO7Y2 : CO : Y : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): CO7Y2, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
54: PHASE CO7Y2 % 2 7 2 !
55: CONST CO7Y2 : CO : Y : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_

## CO7Y6 (Co–Y)

- Id: `phase:co-y:co7y6`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (literature_printed): (Co7Y6) · ? — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (Co7Y6) — Hallstedt 2025 mmc2 row for CO7Y6: Co7Y6
- Stoichiometry: Co 0.5385, Y 0.4615
- Stability: stable in 4 of 4 calculated diagram(s): 300–1049.19 K, x(Y) 0.46154–0.46154
- Literature: 4 values (4 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:co7y6)

Names (7): _corpus: _corpus:phase:co-y:co7y6  
_paper: _paper:10.1016/j.jallcom.2003.10.050:Co7Y6, paper:10.1016/j.jallcom.2005.06.037:Co7Y6  
_tdb: _tdb:CoY-04Du-LB.tdb:CO7Y6, tdb:CoY-06Gol.tdb:CO7Y6, tdb:CoY-21Wan.tdb:CO7Y6, tdb:CoY-96Du.tdb:CO7Y6  


### TDB models of CO7Y6 (4): PHASE and CONSTITUENT statements as written

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): CO7Y6, type code %, sha256 `054ec0f14cb5cb4c…`

~~~~text
75: PHASE CO7Y6 % 2 7 6 !
76: CONST CO7Y6 : CO : Y : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): CO7Y6, type code %, sha256 `aac7ff05f1475e50…`

~~~~text
87: PHASE CO7Y6 % 2 7 6 !
88: CONST CO7Y6 : CO : Y : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): CO7Y6, type code %, sha256 `2ca9bae471245666…`

~~~~text
80: PHASE CO7Y6 % 2 7 6 !
81: CONST CO7Y6 : CO : Y : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): CO7Y6, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
74: PHASE CO7Y6 % 2 7 6 !
75: CONST CO7Y6 : CO : Y : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_

## COY_B33 (Co–Y)

- Id: `phase:co-y:coy-b33`; status `needs_review`
- No structure assigned. Why: assessment_declared_blocked_by:name_suggests_B33_but_dft_space_group_166; name_suggests_B33_but_dft_space_group_166
- Candidate (dft_mp): R-3m (166) — on-hull MP YCo at x(Y)=0.5000
- Candidate (dft_oqmd): R-3m (166) — on-hull OQMD Co1 Y1 at x(Y)=0.5000
- Candidate (literature_printed): CrB · oC8 — printed with a label mapped to this phase
- Candidate (name_token): CrB · B33 · oC8 · Cmcm (63) — Strukturbericht/word 'B33' in the TDB name
- Candidate (sgte_mmc2): CrB · B33 · oC8 · Cmcm (63) — Hallstedt 2025 mmc2 row for COY_B33: CoY
- Candidate (tdb_comment): CrB · oC8 · Cmcm — CoY-04Du-LB.tdb: 'Prototype CrB (oC8, Cmcm)'
- Candidate (tdb_comment): CrB · oC8 · Cmcm — CoY-06Gol.tdb: 'Prototype CrB (oC8, Cmcm)'
- Candidate (tdb_comment): CrB · oC8 · Cmcm — CoY-21Wan.tdb: 'Prototype CrB (oC8, Cmcm)'
- Stoichiometry: Co 0.5000, Y 0.5000
- Stability: stable in 4 of 4 calculated diagram(s): 300–1077.67 K, x(Y) 0.5–0.5
- Literature: 24 values (24 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:coy-b33)

Names (17): _corpus: _corpus:phase:co-y:coy-b33  
_paper: _paper:10.1016/j.jallcom.2003.10.050:CoY, paper:10.1016/j.jallcom.2003.10.050:CoY₃, paper:10.1016/j.jallcom.2003.10.050:Co₁₇Y₂, paper:10.1016/j.jallcom.2003.10.050:Co₂Y, paper:10.1016/j.jallcom.2003.10.050:Co₃Y, paper:10.1016/j.jallcom.2003.10.050:Co₃Y₄, paper:10.1016/j.jallcom.2003.10.050:Co₅Y, paper:10.1016/j.jallcom.2003.10.050:Co₇Y₂, paper:10.1016/j.jallcom.2005.06.037:CoY, paper:10.1016/j.jallcom.2005.06.037:Co₁₇Y₂, paper:10.1016/j.jallcom.2005.06.037:Co₅Y, paper:10.1016/j.jallcom.2005.06.037:YCo  
_tdb: _tdb:CoY-04Du-LB.tdb:COY_B33, tdb:CoY-06Gol.tdb:COY_B33, tdb:CoY-21Wan.tdb:COY_B33, tdb:CoY-96Du.tdb:COY_B33  


### TDB models of COY_B33 (4): PHASE and CONSTITUENT statements as written

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): COY_B33, type code %, sha256 `054ec0f14cb5cb4c…`

~~~~text
80: PHASE COY_B33 % 2 1 1 !
81: CONST COY_B33 : CO : Y : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): COY_B33, type code %, sha256 `aac7ff05f1475e50…`

~~~~text
92: PHASE COY_B33 % 2 1 1 !
93: CONST COY_B33 : CO : Y : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): COY_B33, type code %, sha256 `2ca9bae471245666…`

~~~~text
85: PHASE COY_B33 % 2 1 1 !
86: CONST COY_B33 : CO : Y : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): COY_B33, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
79: PHASE COY_B33 % 2 1 1 !
80: CONST COY_B33 : CO : Y : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_
- [doi:10.1016/0022-5088(82)90186-2](https://doi.org/10.1016/0022-5088%2882%2990186-2) A.K. Grover, B.R. Coles, B.V.B. Sarkissian, H.E.N. Stone, The Y-Co system: a partial phase diagram study, Journal of the Less Common Metals 86, 29-36 (1982).  
_cited as the source of values for this phase_

## COY3_D011 (Co–Y)

- Id: `phase:co-y:coy3-d011`; status `assigned`
- Structure: Fe3C · D0_11 · oP16 · Pnma (62); type `st:d0-11-fe3c-op16`; tier A: standard phase name; confidence high
- Caveat: DFT agrees: on-hull mp-aaackxna and oqmd-664091, space group 62
- Stoichiometry: Co 0.2500, Y 0.7500
- Stability: stable in 4 of 4 calculated diagram(s): 300–1168.59 K, x(Y) 0.75–0.75
- Literature: 8 values (8 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:coy3-d011)

Names (9): _corpus: _corpus:phase:co-y:coy3-d011  
_mp: _mp:mp-aaackxna  
_oqmd: _oqmd:oqmd-664091  
_paper: _paper:10.1016/j.jallcom.2003.10.050:CoY3, paper:10.1016/j.jallcom.2005.06.037:CoY3  
_tdb: _tdb:CoY-04Du-LB.tdb:COY3_D011, tdb:CoY-06Gol.tdb:COY3_D011, tdb:CoY-21Wan.tdb:COY3_D011, tdb:CoY-96Du.tdb:COY3_D011  


### TDB models of COY3_D011 (4): PHASE and CONSTITUENT statements as written

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): COY3_D011, type code %, sha256 `054ec0f14cb5cb4c…`

~~~~text
95: PHASE COY3_D011 % 2 1 3 !
96: CONST COY3_D011 : CO : Y : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): COY3_D011, type code %, sha256 `aac7ff05f1475e50…`

~~~~text
107: PHASE COY3_D011 % 2 1 3 !
108: CONST COY3_D011 : CO : Y : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): COY3_D011, type code %, sha256 `2ca9bae471245666…`

~~~~text
100: PHASE COY3_D011 % 2 1 3 !
101: CONST COY3_D011 : CO : Y : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): COY3_D011, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
94: PHASE COY3_D011 % 2 1 3 !
95: CONST COY3_D011 : CO : Y : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_

## FCC_A1 (Co–Y)

- Id: `phase:co-y: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): 639.99–1773.03 K, x(Y) 0–0.00095
- Literature: 8 values (8 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:fcc-a1)

Names (8): _corpus: _corpus:phase:co-y:fcc-a1  
_paper: _paper:10.1016/j.jallcom.2003.10.050:fcc(Co), paper:10.1016/j.jallcom.2005.06.037:(α-Co), paper:10.1016/j.jallcom.2005.06.037:α-Co  
_tdb: _tdb:CoY-04Du-LB.tdb:FCC_A1, tdb:CoY-06Gol.tdb:FCC_A1, tdb:CoY-21Wan.tdb:FCC_A1, tdb:CoY-96Du.tdb:FCC_A1  


### TDB models of FCC_A1 (4): PHASE and CONSTITUENT statements as written

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): FCC_A1, type code %A, sha256 `054ec0f14cb5cb4c…`

~~~~text
33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : CO% Y : VA : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): FCC_A1, type code %A, sha256 `aac7ff05f1475e50…`

~~~~text
41: PHASE FCC_A1 %A 2 1 1 !
42: CONST FCC_A1 : CO% Y : VA : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): FCC_A1, type code %A, sha256 `2ca9bae471245666…`

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

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): FCC_A1, type code %A, sha256 `fdf8036fa6e999e0…`

~~~~text
28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : CO% Y : VA : !
~~~~

Example references (5 of 5; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_
- [doi:10.1007/bf02667566](https://doi.org/10.1007/bf02667566) H. Okamoto, Co-Y (cobalt-yttrium), JPE 13, 326-328 (1992).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(65)90021-4](https://doi.org/10.1016/0022-5088%2865%2990021-4) J. Pelleg, O.N. Carlson, The yttrium-cobalt system, Journal of the Less Common Metals 9, 281-288 (1965).  
_cited as the source of values for this phase_

## HCP_A3 (Co–Y)

- Id: `phase:co-y: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): 300–1752.54 K, x(Y) 0–1
- Literature: 8 values (8 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:hcp-a3)

Names (8): _corpus: _corpus:phase:co-y:hcp-a3  
_paper: _paper:10.1016/j.jallcom.2003.10.050:hcp(Co), paper:10.1016/j.jallcom.2003.10.050:hcp(Y), paper:10.1016/j.jallcom.2005.06.037:(α-Y)  
_tdb: _tdb:CoY-04Du-LB.tdb:HCP_A3, tdb:CoY-06Gol.tdb:HCP_A3, tdb:CoY-21Wan.tdb:HCP_A3, tdb:CoY-96Du.tdb:HCP_A3  


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

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): HCP_A3, type code %A, sha256 `054ec0f14cb5cb4c…`

~~~~text
43: PHASE HCP_A3 %A 2 1 0.5 !
44: CONST HCP_A3 : CO% Y% : VA : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): HCP_A3, type code %A, sha256 `aac7ff05f1475e50…`

~~~~text
51: PHASE HCP_A3 %A 2 1 0.5 !
52: CONST HCP_A3 : CO% Y% : VA : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): HCP_A3, type code %A, sha256 `2ca9bae471245666…`

~~~~text
44: PHASE HCP_A3 %A 2 1 0.5 !
45: CONST HCP_A3 : CO% Y% : VA : !
~~~~

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): HCP_A3, type code %A, sha256 `fdf8036fa6e999e0…`

~~~~text
38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : CO% Y% : VA : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_

## LIQUID (Co–Y)

- Id: `phase:co-y:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 4 of 4 calculated diagram(s): 1011.35–2500 K, x(Y) 0–1
- Literature: 52 values (52 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-y:liquid)

Names (7): _corpus: _corpus:phase:co-y:liquid  
_paper: _paper:10.1016/j.jallcom.2003.10.050:L, paper:10.1016/j.jallcom.2005.06.037:L  
_tdb: _tdb:CoY-04Du-LB.tdb:LIQUID, tdb:CoY-06Gol.tdb:LIQUID, tdb:CoY-21Wan.tdb:LIQUID, tdb:CoY-96Du.tdb:LIQUID  


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

[CoY-04Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb): LIQUID, type code %, sha256 `054ec0f14cb5cb4c…`

~~~~text
28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : CO Y : !
~~~~

[CoY-06Gol.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb): LIQUID, type code %, sha256 `aac7ff05f1475e50…`

~~~~text
36: PHASE LIQUID:L % 1 1 !
37: CONST LIQUID:L : CO Y : !
~~~~

[CoY-21Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb): LIQUID, type code %, sha256 `2ca9bae471245666…`

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

[CoY-96Du.tdb](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb): LIQUID, type code %, sha256 `fdf8036fa6e999e0…`

~~~~text
23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : CO Y : !
~~~~

Example references (7 of 7; assessments first): 

- [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021).  
_assessment that models this phase_
- [doi:10.1007/bf02667566](https://doi.org/10.1007/bf02667566) H. Okamoto, Co-Y (cobalt-yttrium), JPE 13, 326-328 (1992).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(65)90021-4](https://doi.org/10.1016/0022-5088%2865%2990021-4) J. Pelleg, O.N. Carlson, The yttrium-cobalt system, Journal of the Less Common Metals 9, 281-288 (1965).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(82)90186-2](https://doi.org/10.1016/0022-5088%2882%2990186-2) A.K. Grover, B.R. Coles, B.V.B. Sarkissian, H.E.N. Stone, The Y-Co system: a partial phase diagram study, Journal of the Less Common Metals 86, 29-36 (1982).  
_cited as the source of values for this phase_
- [doi:10.1016/s0168-1273(86)08004-2](https://doi.org/10.1016/s0168-1273%2886%2908004-2) K.A. Gschneidner, F.W. Calderwood, Chapter 54 Intra rare earth binary alloys: Phase relationships, lattice parameters and systematics, Handbook on the Physics and Chemistry of Rare Earths, 1-161 (1986).  
_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).