# Ce–O phases

> Ce–O system: 19 phases (tier A 4, tier C 7, liquid 2, gas 2, needs_review 4); 14 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references.

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

19 phases (tier A 4, tier C 7, liquid 2, gas 2, needs_review 4); 14 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

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

Table: Phases of the Ce–O system (19)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-ce-o-bcc-a2); _phase:ce-o:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 1000–1081.23 K, x(O) 0–0.00647 | 1 | 2 |
| [FLUORITE_C1](#phase-ce-o-c1-fluorite); _phase:ce-o:c1-fluorite_ | CaF2 · C1 · cF12 · Fm-3m (225) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | not stable in 2 calculated diagram(s) | 0 | 2 |
| [CE11O20](#phase-ce-o-ce11o20); _phase:ce-o:ce11o20_ | Tb11O20 · aP31 · P-1 (2) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 300–2416.14 K, x(O) 0.64516–0.64516 | 12 | 2 |
| [CE19O34](#phase-ce-o-ce19o34); _phase:ce-o:ce19o34_ |  | needs_review | stable in 2 of 2 calculated diagram(s): 420.08–2361.24 K, x(O) 0.64151–0.64151 | 13 | 2 |
| [CE40O72](#phase-ce-o-ce40o72); _phase:ce-o:ce40o72_ |  | needs_review | stable in 2 of 2 calculated diagram(s): 435.98–2469.6 K, x(O) 0.64286–0.64286 | 8 | 2 |
| [CE62O112](#phase-ce-o-ce62o112); _phase:ce-o:ce62o112_ |  | needs_review | stable in 2 of 2 calculated diagram(s): 431.2–2471.49 K, x(O) 0.64368–0.64368 | 7 | 2 |
| [CE7O12](#phase-ce-o-ce7o12); _phase:ce-o:ce7o12_ | Pr7O12 · hR19 · R-3 (148) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 300–401.92 K, x(O) 0.63158–0.63158 | 15 | 2 |
| [CE9O16](#phase-ce-o-ce9o16); _phase:ce-o:ce9o16_ |  | needs_review | stable in 2 of 2 calculated diagram(s): 398.92–2293.5 K, x(O) 0.64–0.64 | 8 | 2 |
| [A_R2O3_D52](#phase-ce-o-d52-a-r2o3); _phase:ce-o:d52-a-r2o3_ | A-La2O3 · D5_2 · hP5 · P-3m1 (164) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | not stable in 2 calculated diagram(s) | 2 | 2 |
| [C_R2O3_D53](#phase-ce-o-d53-c-r2o3); _phase:ce-o:d53-c-r2o3_ | Mn2O3 · D5_3 · cI80 · Ia-3 (206) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | not stable in 2 calculated diagram(s) | 0 | 2 |
| [DHCP](#phase-ce-o-dhcp-a3); _phase:ce-o:dhcp-a3_ | alpha-La · A3' · hP4 · P6_3/mmc (194) | tier A: standard phase name | not stable in 2 calculated diagram(s) | 0 | 2 |
| [FCC_A1](#phase-ce-o-fcc-a1); _phase:ce-o:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1005.61 K, x(O) 0–0.0055 | 0 | 2 |
| [GAS](#phase-ce-o-gas); _phase:ce-o:gas_ | gas | gas | stable in 2 of 2 calculated diagram(s): 301.14–2500 K, x(O) 1–1 | 6 | 2 |
| [H_R2O3](#phase-ce-o-h-r2o3); _phase:ce-o:h-r2o3_ | H-La2O3 · hP10 · P6_3/mmc (194) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 300–2417.9 K, x(O) 0.5–0.6 | 0 | 2 |
| [HCP_A3](#phase-ce-o-hcp-a3); _phase:ce-o:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | not stable in 2 calculated diagram(s) | 0 | 2 |
| [ION](#phase-ce-o-ion); _phase:ce-o:ion_ | liquid | liquid | stable in 2 of 2 calculated diagram(s): 1072.01–2500 K, x(O) 0–0.61459 | 0 | 2 |
| [LIQUID](#phase-ce-o-liquid); _phase:ce-o:liquid_ | liquid | liquid | stable in 2 of 2 calculated diagram(s): 1692.18–2500 K, x(O) 0.05324–0.63936 | 23 | 2 |
| [O2GAS](#phase-ce-o-o2gas); _phase:ce-o:o2gas_ | gas | gas | stable in 2 of 2 calculated diagram(s): 300–1185 K, x(O) 1–1 | 0 | 2 |
| [X_R2O3](#phase-ce-o-r2o3-x); _phase:ce-o:r2o3-x_ | Nd2O3 · cI26 · Im-3m (229) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 300–2500 K, x(O) 0.5–0.59253 | 1 | 2 |

## BCC_A2 (Ce–O)

- Id: `phase:ce-o: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): 1000–1081.23 K, x(O) 0–0.00647
- Literature: 1 values (1 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:bcc-a2)

Names (4): _corpus: _corpus:phase:ce-o:bcc-a2  
_paper: _paper:10.1016/j.ssi.2008.06.011:bcc  
_tdb: _tdb:CeO-06Zin.tdb:BCC_A2, tdb:CeO-08Dju.tdb:BCC_A2  


### TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): BCC_A2, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
57: PHASE BCC_A2 % 2 1 1 !
58: CONST BCC_A2 : CE : O VA% : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): BCC_A2, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
53: PHASE BCC_A2 % 2 1 1 !
54: CONST BCC_A2 : CE : O VA% : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase_

## FLUORITE_C1 (Ce–O)

- Id: `phase:ce-o:c1-fluorite`; status `assigned`
- Structure: CaF2 · C1 · cF12 · Fm-3m (225); type `st:c1-caf2-cf12`; 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 (unrecognised_name_tokens:FLUORITE); structure as stated in the SGTE crystallographic table for this phase name and system
- Stability: not stable in 2 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:c1-fluorite)

Names (4): _corpus: _corpus:phase:ce-o:c1-fluorite, corpus:phase:ce-o:fluorite-c1  
_tdb: _tdb:CeO-06Zin.tdb:FLUORITE_C1, tdb:CeO-08Dju.tdb:FLUORITE_C1  


### TDB models of FLUORITE_C1 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): FLUORITE_C1, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
72: PHASE FLUORITE_C1:I % 2 2 4 !
73: CONST FLUORITE_C1:I : CE+3 CE+4% : O-2% VA : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): FLUORITE_C1, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
68: PHASE FLUORITE_C1:I % 2 2 4 !
69: CONST FLUORITE_C1:I : CE+3 CE+4% : O-2% VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_

## CE11O20 (Ce–O)

- Id: `phase:ce-o:ce11o20`; status `assigned`
- Structure: Tb11O20 · aP31 · P-1 (2); type `st:tb11o20-ap31`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
- Stability: stable in 2 of 2 calculated diagram(s): 300–2416.14 K, x(O) 0.64516–0.64516
- Literature: 12 values (12 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:ce11o20)

Names (4): _corpus: _corpus:phase:ce-o:ce11o20  
_paper: _paper:10.1016/j.ssi.2006.02.044:Ce11O20  
_tdb: _tdb:CeO-06Zin.tdb:CE11O20, tdb:CeO-08Dju.tdb:CE11O20  


### TDB models of CE11O20 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): CE11O20, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
122: PHASE CE11O20:I % 3 4 7 20 !
123: CONST CE11O20:I : CE+3 : CE+4 : O-2 : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): CE11O20, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
118: PHASE CE11O20:I % 3 4 7 20 !
119: CONST CE11O20:I : CE+3 : CE+4 : O-2 : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_
- [doi:10.1016/0022-4596(84)90135-x](https://doi.org/10.1016/0022-4596%2884%2990135-x) M. Ricken, J. Nölting, I. Riess, Specific heat and phase diagram of nonstoichiometric ceria (CeO2−x), Journal of Solid State Chemistry 54, 89-99 (1984).  
_cited as the source of values for this phase_

## CE19O34 (Ce–O)

- Id: `phase:ce-o:ce19o34`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model; sgte_mmc2_row_incomplete
- Candidate (sgte_mmc2): (Ce19O34) — Hallstedt 2025 mmc2 row for CE19O34: Ce19O34
- Stability: stable in 2 of 2 calculated diagram(s): 420.08–2361.24 K, x(O) 0.64151–0.64151
- Literature: 13 values (13 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:ce19o34)

Names (4): _corpus: _corpus:phase:ce-o:ce19o34  
_paper: _paper:10.1016/j.ssi.2006.02.044:Ce19O34  
_tdb: _tdb:CeO-06Zin.tdb:CE19O34, tdb:CeO-08Dju.tdb:CE19O34  


### TDB models of CE19O34 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): CE19O34, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
107: PHASE CE19O34:I % 3 8 11 34 !
108: CONST CE19O34:I : CE+3 : CE+4 : O-2 : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): CE19O34, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
103: PHASE CE19O34:I % 3 8 11 34 !
104: CONST CE19O34:I : CE+3 : CE+4 : O-2 : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_
- [doi:10.1006/jssc.2000.8745](https://doi.org/10.1006/jssc.2000.8745) E.A. Kümmerle, F. Güthoff, W. Schweika, G. Heger, J. Solid State Chem. 153 (2000) 218.  
_cited as the source of values for this phase_
- [doi:10.1016/0022-4596(84)90135-x](https://doi.org/10.1016/0022-4596%2884%2990135-x) M. Ricken, J. Nölting, I. Riess, Specific heat and phase diagram of nonstoichiometric ceria (CeO2−x), Journal of Solid State Chemistry 54, 89-99 (1984).  
_cited as the source of values for this phase_

## CE40O72 (Ce–O)

- Id: `phase:ce-o:ce40o72`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model; sgte_mmc2_row_incomplete
- Candidate (sgte_mmc2): (Ce40O72) — Hallstedt 2025 mmc2 row for CE40O72: Ce40O72
- Stability: stable in 2 of 2 calculated diagram(s): 435.98–2469.6 K, x(O) 0.64286–0.64286
- Literature: 8 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:ce40o72)

Names (4): _corpus: _corpus:phase:ce-o:ce40o72  
_paper: _paper:10.1016/j.ssi.2006.02.044:Ce40O72  
_tdb: _tdb:CeO-06Zin.tdb:CE40O72, tdb:CeO-08Dju.tdb:CE40O72  


### TDB models of CE40O72 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): CE40O72, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
112: PHASE CE40O72:I % 3 16 24 72 !
113: CONST CE40O72:I : CE+3 : CE+4 : O-2 : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): CE40O72, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
108: PHASE CE40O72:I % 3 16 24 72 !
109: CONST CE40O72:I : CE+3 : CE+4 : O-2 : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_
- [doi:10.1006/jssc.2000.8745](https://doi.org/10.1006/jssc.2000.8745) E.A. Kümmerle, F. Güthoff, W. Schweika, G. Heger, J. Solid State Chem. 153 (2000) 218.  
_cited as the source of values for this phase_
- [doi:10.1016/0022-4596(84)90135-x](https://doi.org/10.1016/0022-4596%2884%2990135-x) M. Ricken, J. Nölting, I. Riess, Specific heat and phase diagram of nonstoichiometric ceria (CeO2−x), Journal of Solid State Chemistry 54, 89-99 (1984).  
_cited as the source of values for this phase_

## CE62O112 (Ce–O)

- Id: `phase:ce-o:ce62o112`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model; sgte_mmc2_row_incomplete
- Candidate (sgte_mmc2): (Ce62O112) — Hallstedt 2025 mmc2 row for CE62O112: Ce62O112
- Stability: stable in 2 of 2 calculated diagram(s): 431.2–2471.49 K, x(O) 0.64368–0.64368
- Literature: 7 values (7 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:ce62o112)

Names (4): _corpus: _corpus:phase:ce-o:ce62o112  
_paper: _paper:10.1016/j.ssi.2006.02.044:Ce62O112  
_tdb: _tdb:CeO-06Zin.tdb:CE62O112, tdb:CeO-08Dju.tdb:CE62O112  


### TDB models of CE62O112 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): CE62O112, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
117: PHASE CE62O112:I % 3 24 38 112 !
118: CONST CE62O112:I : CE+3 : CE+4 : O-2 : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): CE62O112, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
113: PHASE CE62O112:I % 3 24 38 112 !
114: CONST CE62O112:I : CE+3 : CE+4 : O-2 : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_
- [doi:10.1016/0022-4596(84)90135-x](https://doi.org/10.1016/0022-4596%2884%2990135-x) M. Ricken, J. Nölting, I. Riess, Specific heat and phase diagram of nonstoichiometric ceria (CeO2−x), Journal of Solid State Chemistry 54, 89-99 (1984).  
_cited as the source of values for this phase_
- [doi:10.1006/jssc.2000.8745](https://doi.org/10.1006/jssc.2000.8745) E.A. Kümmerle, F. Güthoff, W. Schweika, G. Heger, J. Solid State Chem. 153 (2000) 218.  
_cited as the source of values for this phase_

## CE7O12 (Ce–O)

- Id: `phase:ce-o:ce7o12`; status `assigned`
- Structure: Pr7O12 · hR19 · R-3 (148); type `st:pr7o12-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 (no_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
- Stability: stable in 2 of 2 calculated diagram(s): 300–401.92 K, x(O) 0.63158–0.63158
- Literature: 15 values (15 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:ce7o12)

Names (4): _corpus: _corpus:phase:ce-o:ce7o12  
_paper: _paper:10.1016/j.ssi.2006.02.044:Ce7O12  
_tdb: _tdb:CeO-06Zin.tdb:CE7O12, tdb:CeO-08Dju.tdb:CE7O12  


### TDB models of CE7O12 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): CE7O12, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
97: PHASE CE7O12:I % 3 4 3 12 !
98: CONST CE7O12:I : CE+3 : CE+4 : O-2 : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): CE7O12, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
93: PHASE CE7O12:I % 3 4 3 12 !
94: CONST CE7O12:I : CE+3 : CE+4 : O-2 : !
~~~~

Example references (6 of 6; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_
- [doi:10.1006/jssc.2000.8745](https://doi.org/10.1006/jssc.2000.8745) E.A. Kümmerle, F. Güthoff, W. Schweika, G. Heger, J. Solid State Chem. 153 (2000) 218.  
_cited as the source of values for this phase_
- [doi:10.1016/0022-1902(64)80038-5](https://doi.org/10.1016/0022-1902%2864%2980038-5) D.J.M. Bevan, J. Kordis, Mixed oxides of the type MO2 (fluorite)—M2O3—I oxygen dissociation pressures and phase relationships in the system CeO2Ce2O3 at high temperatures, Journal of Inorganic and Nuclear Chemistry 26, 1509-1523 (1964).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-4596(84)90135-x](https://doi.org/10.1016/0022-4596%2884%2990135-x) M. Ricken, J. Nölting, I. Riess, Specific heat and phase diagram of nonstoichiometric ceria (CeO2−x), Journal of Solid State Chemistry 54, 89-99 (1984).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-3697(77)90124-x](https://doi.org/10.1016/0022-3697%2877%2990124-x) H.L. Tuller, A.S. Nowick, Small polaron electron transport in reduced CeO2 single crystals, Journal of Physics and Chemistry of Solids 38, 859-867 (1977).  
_cited as the source of values for this phase_

## CE9O16 (Ce–O)

- Id: `phase:ce-o:ce9o16`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model; sgte_mmc2_row_incomplete
- Candidate (sgte_mmc2): (Ce9O16) — Hallstedt 2025 mmc2 row for CE9O16: Ce9O16
- Stability: stable in 2 of 2 calculated diagram(s): 398.92–2293.5 K, x(O) 0.64–0.64
- Literature: 8 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:ce9o16)

Names (4): _corpus: _corpus:phase:ce-o:ce9o16  
_paper: _paper:10.1016/j.ssi.2006.02.044:Ce9O16  
_tdb: _tdb:CeO-06Zin.tdb:CE9O16, tdb:CeO-08Dju.tdb:CE9O16  


### TDB models of CE9O16 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): CE9O16, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
102: PHASE CE9O16:I % 3 4 5 16 !
103: CONST CE9O16:I : CE+3 : CE+4 : O-2 : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): CE9O16, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
98: PHASE CE9O16:I % 3 4 5 16 !
99: CONST CE9O16:I : CE+3 : CE+4 : O-2 : !
~~~~

Example references (5 of 5; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_
- [doi:10.1006/jssc.2000.8745](https://doi.org/10.1006/jssc.2000.8745) E.A. Kümmerle, F. Güthoff, W. Schweika, G. Heger, J. Solid State Chem. 153 (2000) 218.  
_cited as the source of values for this phase_
- [doi:10.1016/0022-4596(84)90135-x](https://doi.org/10.1016/0022-4596%2884%2990135-x) M. Ricken, J. Nölting, I. Riess, Specific heat and phase diagram of nonstoichiometric ceria (CeO2−x), Journal of Solid State Chemistry 54, 89-99 (1984).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-3697(77)90124-x](https://doi.org/10.1016/0022-3697%2877%2990124-x) H.L. Tuller, A.S. Nowick, Small polaron electron transport in reduced CeO2 single crystals, Journal of Physics and Chemistry of Solids 38, 859-867 (1977).  
_cited as the source of values for this phase_

## A_R2O3_D52 (Ce–O)

- Id: `phase:ce-o:d52-a-r2o3`; status `assigned`
- Structure: A-La2O3 · D5_2 · hP5 · P-3m1 (164); type `st:d5-2-a-la2o3-hp5`; 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 (unrecognised_name_tokens:A,R2O3); structure as stated in the SGTE crystallographic table for this phase name and system
- Stability: not stable in 2 calculated diagram(s)
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:d52-a-r2o3)

Names (4): _corpus: _corpus:phase:ce-o:d52-a-r2o3  
_paper: _paper:10.1016/j.ssi.2008.06.011:A  
_tdb: _tdb:CeO-06Zin.tdb:A_R2O3_D52, tdb:CeO-08Dju.tdb:A_R2O3_D52  


### TDB models of A_R2O3_D52 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): A_R2O3_D52, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
77: PHASE A_R2O3_D52:I % 3 2 2 1 !
78: CONST A_R2O3_D52:I : CE+2 CE+3% : O-2 : O-2% VA : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): A_R2O3_D52, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
73: PHASE A_R2O3_D52:I % 3 2 2 1 !
74: CONST A_R2O3_D52:I : CE+2 CE+3% : O-2 : O-2% VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase_

## C_R2O3_D53 (Ce–O)

- Id: `phase:ce-o:d53-c-r2o3`; status `assigned`
- Structure: Mn2O3 · D5_3 · cI80 · Ia-3 (206); type `st:d5-3-mn2o3-ci80`; 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 (unrecognised_name_tokens:C,R2O3); structure as stated in the SGTE crystallographic table for this phase name and system
- Stability: not stable in 2 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:d53-c-r2o3)

Names (3): _corpus: _corpus:phase:ce-o:d53-c-r2o3  
_tdb: _tdb:CeO-06Zin.tdb:C_R2O3_D53, tdb:CeO-08Dju.tdb:C_R2O3_D53  


### TDB models of C_R2O3_D53 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): C_R2O3_D53, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
82: PHASE C_R2O3_D53:I % 3 2 3 1 !
83: CONST C_R2O3_D53:I : CE+3% CE+4 : O-2% : O-2 VA% : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): C_R2O3_D53, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
78: PHASE C_R2O3_D53:I % 3 2 3 1 !
79: CONST C_R2O3_D53:I : CE+3% CE+4 : O-2% VA : O-2 VA% : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_

## DHCP (Ce–O)

- Id: `phase:ce-o: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: not stable in 2 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:dhcp-a3)

Names (3): _corpus: _corpus:phase:ce-o:dhcp-a3  
_tdb: _tdb:CeO-06Zin.tdb:DHCP, tdb:CeO-08Dju.tdb:DHCP  


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

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): DHCP, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
67: PHASE DHCP % 2 1 0.5 !
68: CONST DHCP : CE : O VA% : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): DHCP, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
63: PHASE DHCP % 2 1 0.5 !
64: CONST DHCP : CE : O VA% : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_

## FCC_A1 (Ce–O)

- Id: `phase:ce-o: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): 300–1005.61 K, x(O) 0–0.0055
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:fcc-a1)

Names (3): _corpus: _corpus:phase:ce-o:fcc-a1  
_tdb: _tdb:CeO-06Zin.tdb:FCC_A1, tdb:CeO-08Dju.tdb:FCC_A1  


### TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): FCC_A1, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
51: PHASE FCC_A1 % 2 1 1 !
52: CONST FCC_A1 : CE% : O VA% : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): FCC_A1, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
47: PHASE FCC_A1 % 2 1 1 !
48: CONST FCC_A1 : CE% : O VA% : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_

## GAS (Ce–O)

- Id: `phase:ce-o:gas`; status `assigned`
- Structure: gas; type `st:gas`; gas; confidence high
- Stability: stable in 2 of 2 calculated diagram(s): 301.14–2500 K, x(O) 1–1
- Literature: 6 values (6 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:gas)

Names (5): _corpus: _corpus:phase:ce-o:gas  
_paper: _paper:10.1016/j.ssi.2006.02.044:gas, paper:10.1016/j.ssi.2008.06.011:gas  
_tdb: _tdb:CeO-06Zin.tdb:GAS, tdb:CeO-08Dju.tdb:GAS  


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

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): GAS, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
128: PHASE GAS:G % 1 1 !
129: CONST GAS:G : CE CEO O O2 O3 : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): GAS, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
124: PHASE GAS:G % 1 1 !
125: CONST GAS:G : CE CEO O O2 O3 : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase; reports values for this phase_

## H_R2O3 (Ce–O)

- Id: `phase:ce-o:h-r2o3`; status `assigned`
- Structure: H-La2O3 · hP10 · P6_3/mmc (194); type `st:h-la2o3-hp10`; 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 (name_has_descriptive_tokens:H,R2O3, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stability: stable in 2 of 2 calculated diagram(s): 300–2417.9 K, x(O) 0.5–0.6
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:h-r2o3)

Names (3): _corpus: _corpus:phase:ce-o:h-r2o3  
_tdb: _tdb:CeO-06Zin.tdb:H_R2O3, tdb:CeO-08Dju.tdb:H_R2O3  


### TDB models of H_R2O3 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): H_R2O3, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
87: PHASE H_R2O3:I % 3 2 2 1 !
88: CONST H_R2O3:I : CE+2 CE+3% : O-2 : O-2% VA : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): H_R2O3, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
83: PHASE H_R2O3:I % 3 2 2 1 !
84: CONST H_R2O3:I : CE+2 CE+3% : O-2 : O-2% VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_

## HCP_A3 (Ce–O)

- Id: `phase:ce-o: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: not stable in 2 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:hcp-a3)

Names (3): _corpus: _corpus:phase:ce-o:hcp-a3  
_tdb: _tdb:CeO-06Zin.tdb:HCP_A3, tdb:CeO-08Dju.tdb:HCP_A3  


### TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): HCP_A3, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
62: PHASE HCP_A3 % 2 1 0.5 !
63: CONST HCP_A3 : CE : O VA% : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): HCP_A3, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
58: PHASE HCP_A3 % 2 1 0.5 !
59: CONST HCP_A3 : CE : O VA% : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_

## ION (Ce–O)

- Id: `phase:ce-o:ion`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 2 of 2 calculated diagram(s): 1072.01–2500 K, x(O) 0–0.61459
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:ion)

Names (3): _corpus: _corpus:phase:ce-o:ion  
_tdb: _tdb:CeO-06Zin.tdb:ION, tdb:CeO-08Dju.tdb:ION  


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

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): ION, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
46: PHASE ION:Y % 2 1 1 !
47: CONST ION:Y : CE+3 CE+4 : O-2 VA : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): ION, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
42: PHASE ION:Y % 2 1 1 !
43: CONST ION:Y : CE+3 CE+4 : O-2 VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_

## LIQUID (Ce–O)

- Id: `phase:ce-o:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 2 of 2 calculated diagram(s): 1692.18–2500 K, x(O) 0.05324–0.63936
- Literature: 23 values (23 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:liquid)

Names (5): _corpus: _corpus:phase:ce-o:liquid  
_paper: _paper:10.1016/j.ssi.2006.02.044:liquid, paper:10.1016/j.ssi.2008.06.011:L  
_tdb: _tdb:CeO-06Zin.tdb:LIQUID, tdb:CeO-08Dju.tdb:LIQUID  


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

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): LIQUID, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
43: PHASE LIQUID:L % 1 1 !
44: CONST LIQUID:L : CE CEO1.5 CEO2 : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): LIQUID, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
39: PHASE LIQUID:L % 1 1 !
40: CONST LIQUID:L : CE CEO1.5 CEO2 : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase; reports values for this phase_

## O2GAS (Ce–O)

- Id: `phase:ce-o:o2gas`; status `assigned`
- Structure: gas; type `st:gas`; gas; confidence high
- Stability: stable in 2 of 2 calculated diagram(s): 300–1185 K, x(O) 1–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:o2gas)

Names (3): _corpus: _corpus:phase:ce-o:o2gas  
_tdb: _tdb:CeO-06Zin.tdb:O2GAS, tdb:CeO-08Dju.tdb:O2GAS  


### TDB models of O2GAS (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): O2GAS, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
125: PHASE O2GAS % 1 1 !
126: CONST O2GAS : O2 :!
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): O2GAS, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
121: PHASE O2GAS % 1 1 !
122: CONST O2GAS : O2 :!
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models this phase_
- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase_

## X_R2O3 (Ce–O)

- Id: `phase:ce-o:r2o3-x`; status `assigned`
- Structure: Nd2O3 · cI26 · Im-3m (229); type `st:nd2o3-ci26`; 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 (name_has_descriptive_tokens:R2O3,X, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stability: stable in 2 of 2 calculated diagram(s): 300–2500 K, x(O) 0.5–0.59253
- Literature: 1 values (1 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ce-o:r2o3-x)

Names (4): _corpus: _corpus:phase:ce-o:r2o3-x  
_paper: _paper:10.1016/j.ssi.2008.06.011:X  
_tdb: _tdb:CeO-06Zin.tdb:X_R2O3, tdb:CeO-08Dju.tdb:X_R2O3  


### TDB models of X_R2O3 (2): PHASE and CONSTITUENT statements as written

[CeO-06Zin.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-06Zin.tdb): X_R2O3, type code %, sha256 `3e9afdf3d632ed92…`

~~~~text
92: PHASE X_R2O3:I % 3 2 2 1 !
93: CONST X_R2O3:I : CE+2 CE+3% : O-2 : O-2% VA : !
~~~~

[CeO-08Dju.tdb](https://orchid-project.org/data/databases/sgte-binary/CeO-08Dju.tdb): X_R2O3, type code %, sha256 `f4f16a6dae7120a8…`

~~~~text
88: PHASE X_R2O3:I % 2 2 3 !
89: CONST X_R2O3:I : CE+2 CE+3% : O-2% VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.ssi.2008.06.011](https://doi.org/10.1016/j.ssi.2008.06.011) D DJUROVIC, M ZINKEVICH, F ALDINGER, Thermodynamic modeling of the cerium–yttrium–oxygen system, Solid State Ionics 179, 1902-1911 (2008).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.ssi.2006.02.044](https://doi.org/10.1016/j.ssi.2006.02.044) M ZINKEVICH, D DJUROVIC, F ALDINGER, Thermodynamic modelling of the cerium–oxygen system☆, Solid State Ionics 177, 989-1001 (2006).  
_assessment that models 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).