# Co–Nd phases

> Co–Nd system: 16 phases (tier A 7, tier C 5, liquid 1, needs_review 3); 16 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-ND.html · Markdown: https://data.orchid-project.org/phases/pages/CO-ND.md

16 phases (tier A 7, tier C 5, liquid 1, needs_review 3); 16 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-ND) · [full JSON](https://data.orchid-project.org/phases/systems/CO-ND.json) · [Co–Nd system page](https://data.orchid-project.org/systems/CO-ND.html) · [Markdown](https://data.orchid-project.org/phases/pages/CO-ND.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Co–Nd system (16)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-co-nd-bcc-a2); _phase:co-nd:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1127.95–2499.2 K, x(Nd) 0.99995–1 | 2 | 1 |
| [CO17ND2](#phase-co-nd-co17nd2); _phase:co-nd:co17nd2_ | Th2Zn17 · hR19 · R-3m (166) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1578.98 K, x(Nd) 0.10526–0.10526 | 8 | 1 |
| [CO19ND5](#phase-co-nd-co19nd5); _phase:co-nd:co19nd5_ | Ce5Co19 · hR24 · R-3m (166) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1424.57 K, x(Nd) 0.20833–0.20833 | 5 | 1 |
| [CO2ND_C15](#phase-co-nd-co2nd-c15); _phase:co-nd:co2nd-c15_ | Cu2Mg · C15 · cF24 · Fd-3m (227) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1322.68 K, x(Nd) 0.33333–0.33333 | 5 | 1 |
| [CO2ND5](#phase-co-nd-co2nd5); _phase:co-nd:co2nd5_ | Mn5C2 · mC28 · C2/c (15) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–869.26 K, x(Nd) 0.71429–0.71429 | 4 | 1 |
| [CO3ND](#phase-co-nd-co3nd); _phase:co-nd:co3nd_ | Ni3Pu · hR12 · R-3m (166) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1373.07 K, x(Nd) 0.25–0.25 | 5 | 1 |
| [CO3ND2_HT](#phase-co-nd-co3nd2-ht); _phase:co-nd:co3nd2-ht_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 856.1–922.95 K, x(Nd) 0.4–0.4 | 6 | 1 |
| [CO3ND2_LT](#phase-co-nd-co3nd2-lt); _phase:co-nd:co3nd2-lt_ | La2Ni3 · oC20 · Cmce (64) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–856.1 K, x(Nd) 0.4–0.4 | 2 | 1 |
| [CO3ND4](#phase-co-nd-co3nd4); _phase:co-nd:co3nd4_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–871.9 K, x(Nd) 0.57143–0.57143 | 4 | 1 |
| [CO5ND_D2D](#phase-co-nd-co5nd-d2d); _phase:co-nd:co5nd-d2d_ | CaCu5 · D2_d · hP6 · P6/mmm (191) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1538.27 K, x(Nd) 0.16667–0.16667 | 5 | 1 |
| [CO7ND2](#phase-co-nd-co7nd2); _phase:co-nd:co7nd2_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–1415.73 K, x(Nd) 0.22222–0.22222 | 5 | 1 |
| [COND3_D011](#phase-co-nd-cond3-d011); _phase:co-nd:cond3-d011_ | Fe3C · D0_11 · oP16 · Pnma (62) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–918.57 K, x(Nd) 0.75–0.75 | 7 | 1 |
| [DHCP](#phase-co-nd-dhcp-a3); _phase:co-nd:dhcp-a3_ | alpha-La · A3' · hP4 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1282.95 K, x(Nd) 0.99992–1 | 2 | 1 |
| [FCC_A1](#phase-co-nd-fcc-a1); _phase:co-nd:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 694.99–1796.48 K, x(Nd) 0–0.00242 | 4 | 1 |
| [HCP_A3](#phase-co-nd-hcp-a3); _phase:co-nd:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–694.99 K, x(Nd) 0–0 | 0 | 1 |
| [LIQUID](#phase-co-nd-liquid); _phase:co-nd:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 838.64–2500 K, x(Nd) 0–1 | 26 | 1 |

## BCC_A2 (Co–Nd)

- Id: `phase:co-nd: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 1 of 1 calculated diagram(s): 1127.95–2499.2 K, x(Nd) 0.99995–1
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:bcc-a2)

Names (3): _corpus: _corpus:phase:co-nd:bcc-a2  
_paper: _paper:10.1016/j.jallcom.2006.08.081:bcc(Nd)  
_tdb: _tdb:CoNd-07Liu.tdb:BCC_A2  


### TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): BCC_A2, type code %B, sha256 `9a16a634620fd2a3…`

~~~~text
35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : CO ND% : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0364-5916(91)90030-n](https://doi.org/10.1016/0364-5916%2891%2990030-n) A.T. Dinsdale, SGTE data for pure elements, Calphad 15, 317-425 (1991).  
_cited as the source of values for this phase_

## CO17ND2 (Co–Nd)

- Id: `phase:co-nd:co17nd2`; status `assigned`
- Structure: Th2Zn17 · hR19 · R-3m (166); type `st:th2zn17-hr19`; 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 (mp_oqmd_space_groups_differ, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Co 0.8947, Nd 0.1053
- Stability: stable in 1 of 1 calculated diagram(s): 300–1578.98 K, x(Nd) 0.10526–0.10526
- Literature: 8 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:co17nd2)

Names (3): _corpus: _corpus:phase:co-nd:co17nd2  
_paper: _paper:10.1016/j.jallcom.2006.08.081:Co17Nd2  
_tdb: _tdb:CoNd-07Liu.tdb:CO17ND2  


### TDB models of CO17ND2 (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): CO17ND2, type code %A, sha256 `9a16a634620fd2a3…`

~~~~text
50: PHASE CO17ND2 %A 2 17 2 !
51: CONST CO17ND2 : CO : ND : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## CO19ND5 (Co–Nd)

- Id: `phase:co-nd:co19nd5`; status `assigned`
- Structure: Ce5Co19 · hR24 · R-3m (166); type `st:ce5co19-hr24`; 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 0.7917, Nd 0.2083
- Stability: stable in 1 of 1 calculated diagram(s): 300–1424.57 K, x(Nd) 0.20833–0.20833
- Literature: 5 values (5 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:co19nd5)

Names (3): _corpus: _corpus:phase:co-nd:co19nd5  
_paper: _paper:10.1016/j.jallcom.2006.08.081:Co19Nd5  
_tdb: _tdb:CoNd-07Liu.tdb:CO19ND5  


### TDB models of CO19ND5 (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): CO19ND5, type code %A, sha256 `9a16a634620fd2a3…`

~~~~text
60: PHASE CO19ND5 %A 2 19 5 !
61: CONST CO19ND5 : CO : ND : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## CO2ND_C15 (Co–Nd)

- Id: `phase:co-nd:co2nd-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, Nd 0.3333
- Stability: stable in 1 of 1 calculated diagram(s): 300–1322.68 K, x(Nd) 0.33333–0.33333
- Literature: 5 values (5 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:co2nd-c15)

Names (3): _corpus: _corpus:phase:co-nd:co2nd-c15  
_paper: _paper:10.1016/j.jallcom.2006.08.081:Co2Nd  
_tdb: _tdb:CoNd-07Liu.tdb:CO2ND_C15  


### TDB models of CO2ND_C15 (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): CO2ND_C15, type code %A, sha256 `9a16a634620fd2a3…`

~~~~text
76: PHASE CO2ND_C15 %A 2 2 1 !
77: CONST CO2ND_C15 : CO : ND : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## CO2ND5 (Co–Nd)

- Id: `phase:co-nd:co2nd5`; status `assigned`
- Structure: Mn5C2 · mC28 · C2/c (15); type `st:mn5c2-mc28`; 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_15_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Co 0.2857, Nd 0.7143
- Stability: stable in 1 of 1 calculated diagram(s): 300–869.26 K, x(Nd) 0.71429–0.71429
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:co2nd5)

Names (3): _corpus: _corpus:phase:co-nd:co2nd5  
_paper: _paper:10.1016/j.jallcom.2006.08.081:Co2Nd5  
_tdb: _tdb:CoNd-07Liu.tdb:CO2ND5  


### TDB models of CO2ND5 (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): CO2ND5, type code %, sha256 `9a16a634620fd2a3…`

~~~~text
96: PHASE CO2ND5 % 2 2 5 !
97: CONST CO2ND5 : CO : ND : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## CO3ND (Co–Nd)

- Id: `phase:co-nd:co3nd`; 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, Nd 0.2500
- Stability: stable in 1 of 1 calculated diagram(s): 300–1373.07 K, x(Nd) 0.25–0.25
- Literature: 5 values (5 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:co3nd)

Names (3): _corpus: _corpus:phase:co-nd:co3nd  
_paper: _paper:10.1016/j.jallcom.2006.08.081:Co3Nd  
_tdb: _tdb:CoNd-07Liu.tdb:CO3ND  


### TDB models of CO3ND (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): CO3ND, type code %A, sha256 `9a16a634620fd2a3…`

~~~~text
71: PHASE CO3ND %A 2 3 1 !
72: CONST CO3ND : CO : ND : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## CO3ND2_HT (Co–Nd)

- Id: `phase:co-nd:co3nd2-ht`; status `needs_review`
- No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; sgte_mmc2_row_incomplete
- Candidate (dft_mp): Cmce (64) — on-hull MP Nd2Co3 at x(ND)=0.4000
- Candidate (literature_printed): (Co3Nd2-HT) · ? — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (Co3Nd2-HT) — Hallstedt 2025 mmc2 row for CO3ND2_HT: Co3Nd2 (high T)
- Stoichiometry: Co 0.6000, Nd 0.4000
- Stability: stable in 1 of 1 calculated diagram(s): 856.1–922.95 K, x(Nd) 0.4–0.4
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:co3nd2-ht)

Names (3): _corpus: _corpus:phase:co-nd:co3nd2-ht  
_paper: _paper:10.1016/j.jallcom.2006.08.081:βCo3Nd2  
_tdb: _tdb:CoNd-07Liu.tdb:CO3ND2_HT  


### TDB models of CO3ND2_HT (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): CO3ND2_HT, type code %, sha256 `9a16a634620fd2a3…`

~~~~text
86: PHASE CO3ND2_HT % 2 3 2 !
87: CONST CO3ND2_HT : CO : ND : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## CO3ND2_LT (Co–Nd)

- Id: `phase:co-nd:co3nd2-lt`; status `assigned`
- Structure: La2Ni3 · oC20 · Cmce (64); type `st:la2ni3-oc20`; 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 0.6000, Nd 0.4000
- Stability: stable in 1 of 1 calculated diagram(s): 300–856.1 K, x(Nd) 0.4–0.4
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:co3nd2-lt)

Names (3): _corpus: _corpus:phase:co-nd:co3nd2-lt  
_paper: _paper:10.1016/j.jallcom.2006.08.081:αCo3Nd2  
_tdb: _tdb:CoNd-07Liu.tdb:CO3ND2_LT  


### TDB models of CO3ND2_LT (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): CO3ND2_LT, type code %, sha256 `9a16a634620fd2a3…`

~~~~text
81: PHASE CO3ND2_LT % 2 3 2 !
82: CONST CO3ND2_LT : CO : ND : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## CO3ND4 (Co–Nd)

- Id: `phase:co-nd:co3nd4`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (literature_printed): (Co3Nd4) · hP\* — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (Co3Nd4) — Hallstedt 2025 mmc2 row for CO3ND4: Co3Nd4
- Stoichiometry: Co 0.4286, Nd 0.5714
- Stability: stable in 1 of 1 calculated diagram(s): 300–871.9 K, x(Nd) 0.57143–0.57143
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:co3nd4)

Names (3): _corpus: _corpus:phase:co-nd:co3nd4  
_paper: _paper:10.1016/j.jallcom.2006.08.081:Co3Nd4  
_tdb: _tdb:CoNd-07Liu.tdb:CO3ND4  


### TDB models of CO3ND4 (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): CO3ND4, type code %, sha256 `9a16a634620fd2a3…`

~~~~text
91: PHASE CO3ND4 % 2 3 4 !
92: CONST CO3ND4 : CO : ND : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## CO5ND_D2D (Co–Nd)

- Id: `phase:co-nd:co5nd-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, Nd 0.1667
- Stability: stable in 1 of 1 calculated diagram(s): 300–1538.27 K, x(Nd) 0.16667–0.16667
- Literature: 5 values (5 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:co5nd-d2d)

Names (3): _corpus: _corpus:phase:co-nd:co5nd-d2d  
_paper: _paper:10.1016/j.jallcom.2006.08.081:Co5Nd  
_tdb: _tdb:CoNd-07Liu.tdb:CO5ND_D2D  


### TDB models of CO5ND_D2D (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): CO5ND_D2D, type code %A, sha256 `9a16a634620fd2a3…`

~~~~text
55: PHASE CO5ND_D2D %A 2 5 1 !
56: CONST CO5ND_D2D : CO : ND : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## CO7ND2 (Co–Nd)

- Id: `phase:co-nd:co7nd2`; 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 CO7ND2: Co7Nd2 (low T), see also Co7Gd2
- Candidate (sgte_mmc2): Co7Gd2 · hR18 · R-3m (166) — Hallstedt 2025 mmc2 row for CO7ND2: Co7Nd2 (high T), see also Ce2Ni7
- Candidate (tdb_comment): Ce2Ni7 · hP36 · P6_3/mmc — CoNd-07Liu.tdb: 'Prototype Ce2Ni7 (hP36, P6_3/mmc), LT'
- Candidate (tdb_comment): Co7Gd2 · hR18 · R-3m — CoNd-07Liu.tdb: 'Prototype Co7Gd2 (hR18, R-3m), HT'
- Stoichiometry: Co 0.7778, Nd 0.2222
- Stability: stable in 1 of 1 calculated diagram(s): 300–1415.73 K, x(Nd) 0.22222–0.22222
- Literature: 5 values (5 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:co7nd2)

Names (3): _corpus: _corpus:phase:co-nd:co7nd2  
_paper: _paper:10.1016/j.jallcom.2006.08.081:Co7Nd2  
_tdb: _tdb:CoNd-07Liu.tdb:CO7ND2  


### TDB models of CO7ND2 (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): CO7ND2, type code %A, sha256 `9a16a634620fd2a3…`

~~~~text
66: PHASE CO7ND2 %A 2 7 2 !
67: CONST CO7ND2 : CO : ND : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## COND3_D011 (Co–Nd)

- Id: `phase:co-nd:cond3-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-aaackycx and oqmd-663685, space group 62
- Stoichiometry: Co 0.2500, Nd 0.7500
- Stability: stable in 1 of 1 calculated diagram(s): 300–918.57 K, x(Nd) 0.75–0.75
- Literature: 7 values (7 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:cond3-d011)

Names (5): _corpus: _corpus:phase:co-nd:cond3-d011  
_mp: _mp:mp-aaackycx  
_oqmd: _oqmd:oqmd-663685  
_paper: _paper:10.1016/j.jallcom.2006.08.081:CoNd3  
_tdb: _tdb:CoNd-07Liu.tdb:COND3_D011  


### TDB models of COND3_D011 (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): COND3_D011, type code %A, sha256 `9a16a634620fd2a3…`

~~~~text
101: PHASE COND3_D011 %A 2 1 3 !
102: CONST COND3_D011 : CO : ND : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## DHCP (Co–Nd)

- Id: `phase:co-nd:dhcp-a3`; status `assigned`
- Structure: alpha-La · A3' · hP4 · P6_3/mmc (194); type `st:a3-alpha-la-hp4`; tier A: standard phase name; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 300–1282.95 K, x(Nd) 0.99992–1
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:dhcp-a3)

Names (4): _corpus: _corpus:phase:co-nd:dhcp-a3, corpus:phase:co-nd:dhcp  
_paper: _paper:10.1016/j.jallcom.2006.08.081:dhcp(Nd)  
_tdb: _tdb:CoNd-07Liu.tdb:DHCP  


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

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): DHCP, type code %, sha256 `9a16a634620fd2a3…`

~~~~text
45: PHASE DHCP % 1 1 !
46: CONST DHCP : CO ND% : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## FCC_A1 (Co–Nd)

- Id: `phase:co-nd: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 1 of 1 calculated diagram(s): 694.99–1796.48 K, x(Nd) 0–0.00242
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:fcc-a1)

Names (3): _corpus: _corpus:phase:co-nd:fcc-a1  
_paper: _paper:10.1016/j.jallcom.2006.08.081:fcc(Co)  
_tdb: _tdb:CoNd-07Liu.tdb:FCC_A1  


### TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): FCC_A1, type code %A, sha256 `9a16a634620fd2a3…`

~~~~text
30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : CO% ND : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_

## HCP_A3 (Co–Nd)

- Id: `phase:co-nd: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 1 of 1 calculated diagram(s): 300–694.99 K, x(Nd) 0–0
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:hcp-a3)

Names (2): _corpus: _corpus:phase:co-nd:hcp-a3  
_tdb: _tdb:CoNd-07Liu.tdb:HCP_A3  


### TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): HCP_A3, type code %A, sha256 `9a16a634620fd2a3…`

~~~~text
40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : CO% ND : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase_

## LIQUID (Co–Nd)

- Id: `phase:co-nd:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 838.64–2500 K, x(Nd) 0–1
- Literature: 26 values (26 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:co-nd:liquid)

Names (3): _corpus: _corpus:phase:co-nd:liquid  
_paper: _paper:10.1016/j.jallcom.2006.08.081:liq.  
_tdb: _tdb:CoNd-07Liu.tdb:LIQUID  


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

[CoNd-07Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/CoNd-07Liu.tdb): LIQUID, type code %, sha256 `9a16a634620fd2a3…`

~~~~text
25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : CO ND : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.jallcom.2006.08.081](https://doi.org/10.1016/j.jallcom.2006.08.081) Xuebing Liu, Zhenmin Du, Cuiping Guo, Changrong Li, Thermodynamic assessment of the Co-Nd system, Journal of Alloys and Compounds 439, 97-102 (2007).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0364-5916(91)90030-n](https://doi.org/10.1016/0364-5916%2891%2990030-n) A.T. Dinsdale, SGTE data for pure elements, Calphad 15, 317-425 (1991).  
_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).