# Co–Gd phases > Co–Gd system: 13 phases (tier A 6, tier C 2, liquid 2, needs_review 3); 13 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-GD.html · Markdown: https://data.orchid-project.org/phases/pages/CO-GD.md 13 phases (tier A 6, tier C 2, liquid 2, needs_review 3); 13 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-GD) · [full JSON](https://data.orchid-project.org/phases/systems/CO-GD.json) · [Co–Gd system page](https://data.orchid-project.org/systems/CO-GD.html) · [Markdown](https://data.orchid-project.org/phases/pages/CO-GD.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the Co–Gd system (13) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [BCC_A2](#phase-co-gd-bcc-a2); _phase:co-gd:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 1508.16–2499.87 K, x(Gd) 0.99978–1 | 1 | 2 | | [CO17GD2](#phase-co-gd-co17gd2); _phase:co-gd:co17gd2_ | | needs_review | stable in 1 of 1 calculated diagram(s): 300–1657.58 K, x(Gd) 0.10526–0.10526 | 13 | 1 | | [CO2GD_C15](#phase-co-gd-co2gd-c15); _phase:co-gd:co2gd-c15_ | Cu2Mg · C15 · cF24 · Fd-3m (227) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1388.91 K, x(Gd) 0.33333–0.33333 | 9 | 2 | | [CO3GD](#phase-co-gd-co3gd); _phase:co-gd:co3gd_ | Ni3Pu · hR12 · R-3m (166) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 300–1550.01 K, x(Gd) 0.25–0.25 | 8 | 2 | | [CO3GD4](#phase-co-gd-co3gd4); _phase:co-gd:co3gd4_ | Co3Ho4 · hP22 · P6_3/m (176) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 300–942.86 K, x(Gd) 0.57143–0.57143 | 7 | 2 | | [CO5GD_D2D](#phase-co-gd-co5gd-d2d); _phase:co-gd:co5gd-d2d_ | CaCu5 · D2_d · hP6 · P6/mmm (191) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1123.03–1618.2 K, x(Gd) 0.16667–0.16667 | 10 | 1 | | [CO7GD2](#phase-co-gd-co7gd2); _phase:co-gd:co7gd2_ | | needs_review | stable in 2 of 2 calculated diagram(s): 300–1568.84 K, x(Gd) 0.22222–0.22222 | 10 | 2 | | [COGD3_D011](#phase-co-gd-cogd3-d011); _phase:co-gd:cogd3-d011_ | Fe3C · D0_11 · oP16 · Pnma (62) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1052.9 K, x(Gd) 0.75–0.75 | 6 | 2 | | [DELTA_PHASE](#phase-co-gd-delta-phase); _phase:co-gd:delta-phase_ | | needs_review | stable in 1 of 1 calculated diagram(s): 300–1642.9 K, x(Gd) 0.10526–0.16278 | 0 | 1 | | [FCC_A1](#phase-co-gd-fcc-a1); _phase:co-gd:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 479.99–1801.43 K, x(Gd) 0–0.00043 | 4 | 2 | | [HCP_A3](#phase-co-gd-hcp-a3); _phase:co-gd:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1508.27 K, x(Gd) 0–1 | 5 | 2 | | [KAP_LIQ](#phase-co-gd-kap-liq); _phase:co-gd:kap-liq_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 921.72–2500 K, x(Gd) 0–1 | 0 | 1 | | [LIQUID](#phase-co-gd-liquid); _phase:co-gd:liquid_ | liquid | liquid | stable in 2 of 2 calculated diagram(s): 889.76–2500 K, x(Gd) 0–1 | 27 | 2 | ## BCC_A2 (Co–Gd) - Id: `phase:co-gd: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 2 of 2 calculated diagram(s): 1508.16–2499.87 K, x(Gd) 0.99978–1 - Literature: 1 values (1 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:bcc-a2) Names (4): _corpus: _corpus:phase:co-gd:bcc-a2 _paper: _paper:10.1016/0925-8388(95)01578-7:b.c.c. _tdb: _tdb:CoGd-10Wan.tdb:BCC_A2, tdb:CoGd-95Liu-LB.tdb:BCC_A2 ### TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written [CoGd-10Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb): BCC_A2, type code %B, sha256 `782b5c5fea66780b…` ~~~~text 45: PHASE BCC_A2 %B 2 1 3 ! 46: CONST BCC_A2 : CO GD : VA : ! ~~~~ [CoGd-95Liu-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb): BCC_A2, type code %B, sha256 `a56e13c2aace898a…` ~~~~text 46: PHASE BCC_A2 %B 2 1 3 ! 47: CONST BCC_A2 : CO GD : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). _assessment that models this phase; reports values for this phase_ - [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). _assessment that models this phase_ ## CO17GD2 (Co–Gd) - Id: `phase:co-gd:co17gd2`; status `needs_review` - No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_rows_disagree - Candidate (literature_printed): Ni17Th2 · hP38 — printed with a label mapped to this phase - Candidate (sgte_mmc2): Ni17Th2 · hP38 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for CO17GD2: Co17Gd2 (high T), see also Th2Zn17 - Candidate (sgte_mmc2): Th2Zn17 · hR19 · R-3m (166) — Hallstedt 2025 mmc2 row for CO17GD2: Co17Gd2 (low T), see also Ni17Th2 - Candidate (tdb_comment): Th2Zn17 · hR19 · R-3m — CoGd-95Liu-LB.tdb: 'Prototype Th2Zn17 (hR19, R-3m); low T, Ni17Th2 (hP38, P6_3/mmc); high T' - Stoichiometry: Co 0.8947, Gd 0.1053 - Stability: stable in 1 of 1 calculated diagram(s): 300–1657.58 K, x(Gd) 0.10526–0.10526 - Literature: 13 values (12 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:co17gd2) Names (3): _corpus: _corpus:phase:co-gd:co17gd2 _paper: _paper:10.1016/0925-8388(95)01578-7:Co17Gd2 _tdb: _tdb:CoGd-95Liu-LB.tdb:CO17GD2 ### TDB models of CO17GD2 (1): PHASE and CONSTITUENT statements as written [CoGd-95Liu-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb): CO17GD2, type code %A, sha256 `a56e13c2aace898a…` ~~~~text 56: PHASE CO17GD2 %A 2 17 2 ! 57: CONST CO17GD2 : CO : GD : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/0022-5088(69)90140-4](https://doi.org/10.1016/0022-5088%2869%2990140-4) K.H.J. Buschow, A.S. Van Der Goot, The intermetallic compounds in the gadolinium-cobalt system, Journal of the Less Common Metals 17, 249-255 (1969). _cited as the source of values for this phase_ - [doi:10.1103/physrevb.6.2882](https://doi.org/10.1103/physrevb.6.2882) E. Burzo, Paramagnetic Behavior of Some Rare-Earth Cobalt Compounds, Phys. Rev. B 6, 2882-2887 (1972). _cited as the source of values for this phase_ ## CO2GD_C15 (Co–Gd) - Id: `phase:co-gd:co2gd-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, Gd 0.3333 - Stability: stable in 2 of 2 calculated diagram(s): 300–1388.91 K, x(Gd) 0.33333–0.33333 - Literature: 9 values (8 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:co2gd-c15) Names (4): _corpus: _corpus:phase:co-gd:co2gd-c15 _paper: _paper:10.1016/0925-8388(95)01578-7:Co2Gd _tdb: _tdb:CoGd-10Wan.tdb:CO2GD_C15, tdb:CoGd-95Liu-LB.tdb:CO2GD_C15 ### TDB models of CO2GD_C15 (2): PHASE and CONSTITUENT statements as written [CoGd-10Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb): CO2GD_C15, type code %A, sha256 `782b5c5fea66780b…` ~~~~text 71: PHASE CO2GD_C15 %A 2 2 1 ! 72: CONST CO2GD_C15 : CO : GD : ! ~~~~ [CoGd-95Liu-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb): CO2GD_C15, type code %A, sha256 `a56e13c2aace898a…` ~~~~text 76: PHASE CO2GD_C15 %A 2 2 1 ! 77: CONST CO2GD_C15 : CO : GD : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). _assessment that models this phase; reports values for this phase_ - [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). _assessment that models this phase_ - [doi:10.1016/0022-5088(69)90140-4](https://doi.org/10.1016/0022-5088%2869%2990140-4) K.H.J. Buschow, A.S. Van Der Goot, The intermetallic compounds in the gadolinium-cobalt system, Journal of the Less Common Metals 17, 249-255 (1969). _cited as the source of values for this phase_ - [doi:10.1103/physrevb.6.2882](https://doi.org/10.1103/physrevb.6.2882) E. Burzo, Paramagnetic Behavior of Some Rare-Earth Cobalt Compounds, Phys. Rev. B 6, 2882-2887 (1972). _cited as the source of values for this phase_ ## CO3GD (Co–Gd) - Id: `phase:co-gd:co3gd`; status `assigned` - Structure: Ni3Pu · hR12 · R-3m (166); type `st:ni3pu-hr12`; 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 0.7500, Gd 0.2500 - Stability: stable in 2 of 2 calculated diagram(s): 300–1550.01 K, x(Gd) 0.25–0.25 - Literature: 8 values (8 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:co3gd) Names (4): _corpus: _corpus:phase:co-gd:co3gd _paper: _paper:10.1016/0925-8388(95)01578-7:Co3Gd _tdb: _tdb:CoGd-10Wan.tdb:CO3GD, tdb:CoGd-95Liu-LB.tdb:CO3GD ### TDB models of CO3GD (2): PHASE and CONSTITUENT statements as written [CoGd-10Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb): CO3GD, type code %A, sha256 `782b5c5fea66780b…` ~~~~text 66: PHASE CO3GD %A 2 3 1 ! 67: CONST CO3GD : CO : GD : ! ~~~~ [CoGd-95Liu-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb): CO3GD, type code %A, sha256 `a56e13c2aace898a…` ~~~~text 71: PHASE CO3GD %A 2 3 1 ! 72: CONST CO3GD : CO : GD : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). _assessment that models this phase; reports values for this phase_ - [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). _assessment that models this phase_ - [doi:10.1016/0022-5088(69)90140-4](https://doi.org/10.1016/0022-5088%2869%2990140-4) K.H.J. Buschow, A.S. Van Der Goot, The intermetallic compounds in the gadolinium-cobalt system, Journal of the Less Common Metals 17, 249-255 (1969). _cited as the source of values for this phase_ - [doi:10.1103/physrevb.6.2882](https://doi.org/10.1103/physrevb.6.2882) E. Burzo, Paramagnetic Behavior of Some Rare-Earth Cobalt Compounds, Phys. Rev. B 6, 2882-2887 (1972). _cited as the source of values for this phase_ ## CO3GD4 (Co–Gd) - Id: `phase:co-gd:co3gd4`; 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_oqmd, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system - Stoichiometry: Co 0.4286, Gd 0.5714 - Stability: stable in 2 of 2 calculated diagram(s): 300–942.86 K, x(Gd) 0.57143–0.57143 - Literature: 7 values (6 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:co3gd4) Names (4): _corpus: _corpus:phase:co-gd:co3gd4 _paper: _paper:10.1016/0925-8388(95)01578-7:Co3Gd4 _tdb: _tdb:CoGd-10Wan.tdb:CO3GD4, tdb:CoGd-95Liu-LB.tdb:CO3GD4 ### TDB models of CO3GD4 (2): PHASE and CONSTITUENT statements as written [CoGd-10Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb): CO3GD4, type code %A, sha256 `782b5c5fea66780b…` ~~~~text 76: PHASE CO3GD4 %A 2 3 4 ! 77: CONST CO3GD4 : CO : GD : ! ~~~~ [CoGd-95Liu-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb): CO3GD4, type code %A, sha256 `a56e13c2aace898a…` ~~~~text 81: PHASE CO3GD4 %A 2 3 4 ! 82: CONST CO3GD4 : CO : GD : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). _assessment that models this phase; reports values for this phase_ - [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). _assessment that models this phase_ - [doi:10.1016/0022-5088(69)90140-4](https://doi.org/10.1016/0022-5088%2869%2990140-4) K.H.J. Buschow, A.S. Van Der Goot, The intermetallic compounds in the gadolinium-cobalt system, Journal of the Less Common Metals 17, 249-255 (1969). _cited as the source of values for this phase_ - [doi:10.1103/physrevb.6.2882](https://doi.org/10.1103/physrevb.6.2882) E. Burzo, Paramagnetic Behavior of Some Rare-Earth Cobalt Compounds, Phys. Rev. B 6, 2882-2887 (1972). _cited as the source of values for this phase_ ## CO5GD_D2D (Co–Gd) - Id: `phase:co-gd:co5gd-d2d`; status `assigned` - Structure: CaCu5 · D2_d · hP6 · P6/mmm (191); type `st:d2-d-cacu5-hp6`; tier A: standard phase name; confidence high - Stoichiometry: Co 0.8333, Gd 0.1667 - Stability: stable in 1 of 1 calculated diagram(s): 1123.03–1618.2 K, x(Gd) 0.16667–0.16667 - Literature: 10 values (9 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:co5gd-d2d) Names (3): _corpus: _corpus:phase:co-gd:co5gd-d2d _paper: _paper:10.1016/0925-8388(95)01578-7:Co5Gd _tdb: _tdb:CoGd-95Liu-LB.tdb:CO5GD_D2D ### TDB models of CO5GD_D2D (1): PHASE and CONSTITUENT statements as written [CoGd-95Liu-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb): CO5GD_D2D, type code %A, sha256 `a56e13c2aace898a…` ~~~~text 61: PHASE CO5GD_D2D %A 2 5 1 ! 62: CONST CO5GD_D2D : CO : GD : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/0022-5088(69)90140-4](https://doi.org/10.1016/0022-5088%2869%2990140-4) K.H.J. Buschow, A.S. Van Der Goot, The intermetallic compounds in the gadolinium-cobalt system, Journal of the Less Common Metals 17, 249-255 (1969). _cited as the source of values for this phase_ - [doi:10.1103/physrevb.6.2882](https://doi.org/10.1103/physrevb.6.2882) E. Burzo, Paramagnetic Behavior of Some Rare-Earth Cobalt Compounds, Phys. Rev. B 6, 2882-2887 (1972). _cited as the source of values for this phase_ ## CO7GD2 (Co–Gd) - Id: `phase:co-gd:co7gd2`; status `needs_review` - No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_rows_disagree - Candidate (literature_printed): Ce2Ni7 · hP36 — printed with a label mapped to this phase - Candidate (sgte_mmc2): Ce2Ni7 · hP36 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for CO7GD2: Co7Gd2 (high T), see also Co7Gd2 - Candidate (sgte_mmc2): Co7Gd2 · hR18 · R-3m (166) — Hallstedt 2025 mmc2 row for CO7GD2: Co7Gd2 (low T), see also Ce2Ni7 - Candidate (tdb_comment): Co7Gd2 · hR18 · R-3m — CoGd-10Wan.tdb: 'Prototype Co7Gd2 (hR18, R-3m); low T, Ce2Ni7 (hP36, P6_3/mmc); high T' - Candidate (tdb_comment): Co7Gd2 · hR18 · R-3m — CoGd-95Liu-LB.tdb: 'Prototype Co7Gd2 (hR18, R-3m); low T, Ce2Ni7 (hP36, P6_3/mmc); high T' - Stoichiometry: Co 0.7778, Gd 0.2222 - Stability: stable in 2 of 2 calculated diagram(s): 300–1568.84 K, x(Gd) 0.22222–0.22222 - Literature: 10 values (9 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:co7gd2) Names (4): _corpus: _corpus:phase:co-gd:co7gd2 _paper: _paper:10.1016/0925-8388(95)01578-7:Co7Gd2 _tdb: _tdb:CoGd-10Wan.tdb:CO7GD2, tdb:CoGd-95Liu-LB.tdb:CO7GD2 ### TDB models of CO7GD2 (2): PHASE and CONSTITUENT statements as written [CoGd-10Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb): CO7GD2, type code %A, sha256 `782b5c5fea66780b…` ~~~~text 61: PHASE CO7GD2 %A 2 7 2 ! 62: CONST CO7GD2 : CO : GD : ! ~~~~ [CoGd-95Liu-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb): CO7GD2, type code %A, sha256 `a56e13c2aace898a…` ~~~~text 66: PHASE CO7GD2 %A 2 7 2 ! 67: CONST CO7GD2 : CO : GD : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). _assessment that models this phase; reports values for this phase_ - [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). _assessment that models this phase_ - [doi:10.1016/0022-5088(69)90140-4](https://doi.org/10.1016/0022-5088%2869%2990140-4) K.H.J. Buschow, A.S. Van Der Goot, The intermetallic compounds in the gadolinium-cobalt system, Journal of the Less Common Metals 17, 249-255 (1969). _cited as the source of values for this phase_ - [doi:10.1103/physrevb.6.2882](https://doi.org/10.1103/physrevb.6.2882) E. Burzo, Paramagnetic Behavior of Some Rare-Earth Cobalt Compounds, Phys. Rev. B 6, 2882-2887 (1972). _cited as the source of values for this phase_ ## COGD3_D011 (Co–Gd) - Id: `phase:co-gd:cogd3-d011`; status `assigned` - Structure: Fe3C · D0_11 · oP16 · Pnma (62); type `st:d0-11-fe3c-op16`; tier A: standard phase name; confidence high - Stoichiometry: Co 0.2500, Gd 0.7500 - Stability: stable in 2 of 2 calculated diagram(s): 300–1052.9 K, x(Gd) 0.75–0.75 - Literature: 6 values (6 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:cogd3-d011) Names (4): _corpus: _corpus:phase:co-gd:cogd3-d011 _paper: _paper:10.1016/0925-8388(95)01578-7:CoGd3 _tdb: _tdb:CoGd-10Wan.tdb:COGD3_D011, tdb:CoGd-95Liu-LB.tdb:COGD3_D011 ### TDB models of COGD3_D011 (2): PHASE and CONSTITUENT statements as written [CoGd-10Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb): COGD3_D011, type code %A, sha256 `782b5c5fea66780b…` ~~~~text 81: PHASE COGD3_D011 %A 2 1 3 ! 82: CONST COGD3_D011 : CO : GD : ! ~~~~ [CoGd-95Liu-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb): COGD3_D011, type code %A, sha256 `a56e13c2aace898a…` ~~~~text 86: PHASE COGD3_D011 %A 2 1 3 ! 87: CONST COGD3_D011 : CO : GD : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). _assessment that models this phase; reports values for this phase_ - [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). _assessment that models this phase_ - [doi:10.1016/0022-5088(69)90140-4](https://doi.org/10.1016/0022-5088%2869%2990140-4) K.H.J. Buschow, A.S. Van Der Goot, The intermetallic compounds in the gadolinium-cobalt system, Journal of the Less Common Metals 17, 249-255 (1969). _cited as the source of values for this phase_ - [doi:10.1103/physrevb.6.2882](https://doi.org/10.1103/physrevb.6.2882) E. Burzo, Paramagnetic Behavior of Some Rare-Earth Cobalt Compounds, Phys. Rev. B 6, 2882-2887 (1972). _cited as the source of values for this phase_ ## DELTA_PHASE (Co–Gd) - Id: `phase:co-gd:delta-phase`; status `needs_review` - No structure assigned. Why: no_structure_token; off_stoichiometric_model; sgte_mmc2_rows_disagree - Candidate (sgte_mmc2): CaCu5 · D2_d · hP6 · P6/mmm (191) — Hallstedt 2025 mmc2 row for DELTA_PHASE: Co5Gd, see also Th2Zn17 and Ni17Th2 - Candidate (sgte_mmc2): Ni17Th2 · hP38 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for DELTA_PHASE: Co17Gd2 (high T), see also Th2Zn17 and CaCu5 - Candidate (sgte_mmc2): Th2Zn17 · hR19 · R-3m (166) — Hallstedt 2025 mmc2 row for DELTA_PHASE: Co17Gd2 (low T), see also Ni17Th2 and CaCu5 - Stability: stable in 1 of 1 calculated diagram(s): 300–1642.9 K, x(Gd) 0.10526–0.16278 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:delta-phase) Names (2): _corpus: _corpus:phase:co-gd:delta-phase _tdb: _tdb:CoGd-10Wan.tdb:DELTA_PHASE ### TDB models of DELTA_PHASE (1): PHASE and CONSTITUENT statements as written [CoGd-10Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb): DELTA_PHASE, type code %A, sha256 `782b5c5fea66780b…` ~~~~text 56: PHASE DELTA_PHASE %A 3 1 2 15 ! 57: CONST DELTA_PHASE : CO2 GD : CO2 GD : CO : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). _assessment that models this phase_ ## FCC_A1 (Co–Gd) - Id: `phase:co-gd: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 2 of 2 calculated diagram(s): 479.99–1801.43 K, x(Gd) 0–0.00043 - Literature: 4 values (4 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:fcc-a1) Names (4): _corpus: _corpus:phase:co-gd:fcc-a1 _paper: _paper:10.1016/0925-8388(95)01578-7:f.c.c. _tdb: _tdb:CoGd-10Wan.tdb:FCC_A1, tdb:CoGd-95Liu-LB.tdb:FCC_A1 ### TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written [CoGd-10Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb): FCC_A1, type code %A, sha256 `782b5c5fea66780b…` ~~~~text 40: PHASE FCC_A1 %A 2 1 1 ! 41: CONST FCC_A1 : CO% GD : VA : ! ~~~~ [CoGd-95Liu-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb): FCC_A1, type code %A, sha256 `a56e13c2aace898a…` ~~~~text 41: PHASE FCC_A1 %A 2 1 1 ! 42: CONST FCC_A1 : CO% GD : VA : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). _assessment that models this phase; reports values for this phase_ - [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). _assessment that models this phase_ - [doi:10.1016/0022-5088(69)90140-4](https://doi.org/10.1016/0022-5088%2869%2990140-4) K.H.J. Buschow, A.S. Van Der Goot, The intermetallic compounds in the gadolinium-cobalt system, Journal of the Less Common Metals 17, 249-255 (1969). _cited as the source of values for this phase_ ## HCP_A3 (Co–Gd) - Id: `phase:co-gd: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 2 of 2 calculated diagram(s): 300–1508.27 K, x(Gd) 0–1 - Literature: 5 values (5 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:hcp-a3) Names (4): _corpus: _corpus:phase:co-gd:hcp-a3 _paper: _paper:10.1016/0925-8388(95)01578-7:h.c.p. _tdb: _tdb:CoGd-10Wan.tdb:HCP_A3, tdb:CoGd-95Liu-LB.tdb:HCP_A3 ### TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written [CoGd-10Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb): HCP_A3, type code %A, sha256 `782b5c5fea66780b…` ~~~~text 50: PHASE HCP_A3 %A 2 1 0.5 ! 51: CONST HCP_A3 : CO% GD% : VA : ! ~~~~ [CoGd-95Liu-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb): HCP_A3, type code %A, sha256 `a56e13c2aace898a…` ~~~~text 51: PHASE HCP_A3 %A 2 1 0.5 ! 52: CONST HCP_A3 : CO% GD% : VA : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). _assessment that models this phase; reports values for this phase_ - [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). _assessment that models this phase_ - [doi:10.1016/0022-5088(69)90140-4](https://doi.org/10.1016/0022-5088%2869%2990140-4) K.H.J. Buschow, A.S. Van Der Goot, The intermetallic compounds in the gadolinium-cobalt system, Journal of the Less Common Metals 17, 249-255 (1969). _cited as the source of values for this phase_ ## KAP_LIQ (Co–Gd) - Id: `phase:co-gd:kap-liq`; status `assigned` - Structure: liquid; type `st:liquid`; liquid; confidence high - Stability: stable in 1 of 1 calculated diagram(s): 921.72–2500 K, x(Gd) 0–1 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:kap-liq) Names (2): _corpus: _corpus:phase:co-gd:kap-liq _tdb: _tdb:CoGd-10Wan.tdb:KAP_LIQ ### TDB models of KAP_LIQ (1): PHASE and CONSTITUENT statements as written [CoGd-10Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb): KAP_LIQ, type code %, sha256 `782b5c5fea66780b…` ~~~~text 35: PHASE KAP_LIQ:L % 1 1 ! 36: CONST KAP_LIQ:L : CO GD : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). _assessment that models this phase_ ## LIQUID (Co–Gd) - Id: `phase:co-gd:liquid`; status `assigned` - Structure: liquid; type `st:liquid`; liquid; confidence high - Stability: stable in 2 of 2 calculated diagram(s): 889.76–2500 K, x(Gd) 0–1 - Literature: 27 values (26 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-gd:liquid) Names (4): _corpus: _corpus:phase:co-gd:liquid _paper: _paper:10.1016/0925-8388(95)01578-7:L _tdb: _tdb:CoGd-10Wan.tdb:LIQUID, tdb:CoGd-95Liu-LB.tdb:LIQUID ### TDB models of LIQUID (2): PHASE and CONSTITUENT statements as written [CoGd-10Wan.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb): LIQUID, type code %, sha256 `782b5c5fea66780b…` ~~~~text 30: PHASE LIQUID:L % 1 1 ! 31: CONST LIQUID:L : CO GD : ! ~~~~ [CoGd-95Liu-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb): LIQUID, type code %, sha256 `a56e13c2aace898a…` ~~~~text 36: PHASE LIQUID:L % 1 1 ! 37: CONST LIQUID:L : CO GD : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). _assessment that models this phase; reports values for this phase_ - [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). _assessment that models this phase_ - [doi:10.1016/0022-5088(69)90140-4](https://doi.org/10.1016/0022-5088%2869%2990140-4) K.H.J. Buschow, A.S. Van Der Goot, The intermetallic compounds in the gadolinium-cobalt system, Journal of the Less Common Metals 17, 249-255 (1969). _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).