Ce–O phases

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 · full JSON · Ce–O system page · Markdown · field reference

Phases of the Ce–O system (19)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
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	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	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		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		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		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	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		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	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	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	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	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	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	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	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	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	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	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	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

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: BCC_A2, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: BCC_A2, type code %, sha256 f4f16a6dae7120a8…

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 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 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
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

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: FLUORITE_C1, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: FLUORITE_C1, type code %, sha256 f4f16a6dae7120a8…

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 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 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
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

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: CE11O20, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: CE11O20, type code %, sha256 f4f16a6dae7120a8…

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 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 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 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

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: CE19O34, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: CE19O34, type code %, sha256 f4f16a6dae7120a8…

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 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 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 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 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

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: CE40O72, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: CE40O72, type code %, sha256 f4f16a6dae7120a8…

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 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 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 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 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

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: CE62O112, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: CE62O112, type code %, sha256 f4f16a6dae7120a8…

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 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 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 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 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
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

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: CE7O12, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: CE7O12, type code %, sha256 f4f16a6dae7120a8…

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 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 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 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 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 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 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

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: CE9O16, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: CE9O16, type code %, sha256 f4f16a6dae7120a8…

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 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 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 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 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 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
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

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: A_R2O3_D52, type code %, sha256 3e9afdf3d632ed92…

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: A_R2O3_D52, type code %, sha256 f4f16a6dae7120a8…

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 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 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
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

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: C_R2O3_D53, type code %, sha256 3e9afdf3d632ed92…

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: C_R2O3_D53, type code %, sha256 f4f16a6dae7120a8…

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 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 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

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: DHCP, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: DHCP, type code %, sha256 f4f16a6dae7120a8…

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 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 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

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: FCC_A1, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: FCC_A1, type code %, sha256 f4f16a6dae7120a8…

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 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 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

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: GAS, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: GAS, type code %, sha256 f4f16a6dae7120a8…

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 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 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
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

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: H_R2O3, type code %, sha256 3e9afdf3d632ed92…

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: H_R2O3, type code %, sha256 f4f16a6dae7120a8…

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 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 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

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: HCP_A3, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: HCP_A3, type code %, sha256 f4f16a6dae7120a8…

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 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 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

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: ION, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: ION, type code %, sha256 f4f16a6dae7120a8…

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 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 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

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: LIQUID, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: LIQUID, type code %, sha256 f4f16a6dae7120a8…

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 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 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

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: O2GAS, type code %, sha256 3e9afdf3d632ed92…

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

CeO-08Dju.tdb: O2GAS, type code %, sha256 f4f16a6dae7120a8…

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

Example references (2 of 2; assessments first):

doi: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 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
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

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: X_R2O3, type code %, sha256 3e9afdf3d632ed92…

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: X_R2O3, type code %, sha256 f4f16a6dae7120a8…

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 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 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). doi: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). doi: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.

@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}
}