O–Y phases

10 phases (tier A 3, tier C 1, liquid 2, gas 2, needs_review 2); 8 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 · O–Y system page · Markdown · field reference

Phases of the O–Y system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:o-y:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 1452.65–1949.34 K, x(O) 0–0.29079	6	7
C_R2O3_D53 phase:o-y:d53-c-r2o3	Mn2O3 · D5_3 · cI80 · Ia-3 (206)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 4 of 4 calculated diagram(s): 300–2500 K, x(O) 0.59059–0.6	5	7
FCC_A1 phase:o-y:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 4 calculated diagram(s)	0	7
GAS phase:o-y:gas	gas	gas	stable in 4 of 4 calculated diagram(s): 300–2500 K, x(O) 0.99968–1	1	7
H_R2O3 phase:o-y:h-r2o3		needs_review	not stable in 2 calculated diagram(s)	0	5
HCP_A3 phase:o-y:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–1786.14 K, x(O) 0–0.15151	2	7
ION phase:o-y:ion	liquid	liquid	stable in 4 of 4 calculated diagram(s): 1794.84–2500 K, x(O) 0–0.54853	0	7
LIQUID phase:o-y:liquid	liquid	liquid	stable in 2 of 4 calculated diagram(s): 1780.01–2500 K, x(O) 0–0.53939	8	7
O2GAS phase:o-y:o2gas	gas	gas	stable in 4 of 4 calculated diagram(s): 300–1185 K, x(O) 1–1	0	7
H_Y2O3 phase:o-y:y2o3-h		needs_review	stable in 2 of 2 calculated diagram(s): 2470–2500 K	0	2

BCC_A2 (O–Y)

Id: phase:o-y:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: stable in 4 of 4 calculated diagram(s): 1452.65–1949.34 K, x(O) 0–0.29079
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:o-y:bcc-a2
paper: paper:10.1016/j.calphad.2007.01.010:β-Y
tdb: tdb:YO-04Che.tdb:BCC_A2, tdb:YO-05Che.tdb:BCC_A2, tdb:YO-07Dju.tdb:BCC_A2, tdb:YO-19Xu.tdb:BCC_A2, tdb:YO-96Gro.tdb:BCC_A2, tdb:YO-98Swa-LB.tdb:BCC_A2, tdb:YO-98Swa-orig.tdb:BCC_A2

TDB models of BCC_A2 (7): PHASE and CONSTITUENT statements as written

YO-04Che.tdb: BCC_A2, type code %B, sha256 5e7b671c151efa3a…

51: PHASE BCC_A2 %B 2 1 1.5 !
52: CONST BCC_A2 : Y : O VA% : !

YO-05Che.tdb: BCC_A2, type code %B, sha256 3d68bece5feb27d6…

60: PHASE BCC_A2 %B 2 1 1.5 !
61: CONST BCC_A2 : Y : O VA% : !

YO-07Dju.tdb: BCC_A2, type code %B, sha256 c90b7972a3e43f0c…

54: PHASE BCC_A2 %B 2 1 1 !
55: CONST BCC_A2 : Y : O VA% : !

YO-19Xu.tdb: BCC_A2, type code %B, sha256 b4f395684596b2ae…

55: PHASE BCC_A2 %B 2 1 3 !
56: CONST BCC_A2 : Y : O VA% : !

YO-96Gro.tdb: BCC_A2, type code %B, sha256 5a6e383e87834517…

57: PHASE BCC_A2 %B 2 1 3 !
58: CONST BCC_A2 : Y : O VA% : !

YO-98Swa-LB.tdb: BCC_A2, type code %B, sha256 dbfb3a4c9a845450…

57: PHASE BCC_A2 %B 2 1 3 !
58: CONST BCC_A2 : Y : O VA% : !

YO-98Swa-orig.tdb: BCC_A2, type code %B, sha256 008445aaef3a7ed9…

57: PHASE BCC_A2 %B 2 1 3 !
58: CONST BCC_A2 : Y : O VA% : !

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2007.01.010 Dejan Djurovic, Matvei Zinkevich, Fritz Aldinger, Thermodynamic modeling of the yttrium–oxygen system, Calphad 31, 560-566 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2005.06.006 M. Chen, B. Hallstedt, L.J. Gauckler, Calphad, 29, 103-13(2005).
assessment that models this phase
doi:10.1016/j.calphad.2018.10.007 H. Xu, M. Chen, K. Cheng, L. Zhang, Y. Du, Calphad, 64, 1-10(2019).
assessment that models this phase
doi:10.1016/j.ssi.2004.02.017 M CHEN, B HALLSTEDT, L GAUCKLER, Thermodynamic modeling of the ZrO2–YO1.5 system, Solid State Ionics 170, 255-274 (2004).
assessment that models this phase
doi:10.1016/S0925-8388(98)00245-X V. Swamy, H.J. Seifert, F. Aldinger, J. Alloys Compd., 269, 201-7(1998).
assessment that models this phase
doi:10.1515/ijmr-1996-870203 Z. Metallkd., 87, 88-91(1996).
assessment that models this phase

C_R2O3_D53 (O–Y)

Id: phase:o-y: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: stable in 4 of 4 calculated diagram(s): 300–2500 K, x(O) 0.59059–0.6
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (11): corpus: corpus:phase:o-y:d53-c-r2o3, corpus:phase:o-y:c-r2o3-d53
paper: paper:10.1016/j.calphad.2007.01.010:gα-Y2O3, paper:10.1016/j.calphad.2007.01.010:α-Y2O3
tdb: tdb:YO-04Che.tdb:C_R2O3_D53, tdb:YO-05Che.tdb:C_R2O3_D53, tdb:YO-07Dju.tdb:C_R2O3_D53, tdb:YO-19Xu.tdb:C_R2O3_D53, tdb:YO-96Gro.tdb:C_R2O3_D53, tdb:YO-98Swa-LB.tdb:C_R2O3_D53, tdb:YO-98Swa-orig.tdb:C_R2O3_D53

TDB models of C_R2O3_D53 (7): PHASE and CONSTITUENT statements as written

YO-04Che.tdb: C_R2O3_D53, type code %, sha256 5e7b671c151efa3a…

62: PHASE C_R2O3_D53:I % 3 2 3 1 !
63: CONST C_R2O3_D53:I : Y Y+3% : O-2% VA : O-2 VA% : !

YO-05Che.tdb: C_R2O3_D53, type code %, sha256 3d68bece5feb27d6…

71: PHASE C_R2O3_D53:I % 3 2 3 1 !
72: CONST C_R2O3_D53:I : Y Y+3% : O-2% VA : O-2 VA% : !

YO-07Dju.tdb: C_R2O3_D53, type code %, sha256 c90b7972a3e43f0c…

64: PHASE C_R2O3_D53:I % 3 2 3 1 !
65: CONST C_R2O3_D53:I : Y+2 Y+3% : O-2% VA : O-2 VA% : !

YO-19Xu.tdb: C_R2O3_D53, type code %, sha256 b4f395684596b2ae…

66: PHASE C_R2O3_D53:I % 3 2 3 1 !
67: CONST C_R2O3_D53:I : Y Y+3% : O-2% VA : O-2 VA% : !

YO-96Gro.tdb: C_R2O3_D53, type code %, sha256 5a6e383e87834517…

69: PHASE C_R2O3_D53:I % 2 2 3 !
70: CONST C_R2O3_D53:I : Y+3 : O-2% VA-2 : !

YO-98Swa-LB.tdb: C_R2O3_D53, type code %, sha256 dbfb3a4c9a845450…

69: PHASE C_R2O3_D53:I % 2 2 3 !
70: CONST C_R2O3_D53:I : Y+3 : O-2% VA-2 : !

YO-98Swa-orig.tdb: C_R2O3_D53, type code %, sha256 008445aaef3a7ed9…

69: PHASE C_R2O3_D53:I % 2 2 3 !
70: CONST C_R2O3_D53:I : Y+3 : O-2% VA-2 : !

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2007.01.010 Dejan Djurovic, Matvei Zinkevich, Fritz Aldinger, Thermodynamic modeling of the yttrium–oxygen system, Calphad 31, 560-566 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2005.06.006 M. Chen, B. Hallstedt, L.J. Gauckler, Calphad, 29, 103-13(2005).
assessment that models this phase
doi:10.1016/j.calphad.2018.10.007 H. Xu, M. Chen, K. Cheng, L. Zhang, Y. Du, Calphad, 64, 1-10(2019).
assessment that models this phase
doi:10.1016/j.ssi.2004.02.017 M CHEN, B HALLSTEDT, L GAUCKLER, Thermodynamic modeling of the ZrO2–YO1.5 system, Solid State Ionics 170, 255-274 (2004).
assessment that models this phase
doi:10.1016/S0925-8388(98)00245-X V. Swamy, H.J. Seifert, F. Aldinger, J. Alloys Compd., 269, 201-7(1998).
assessment that models this phase
doi:10.1515/ijmr-1996-870203 Z. Metallkd., 87, 88-91(1996).
assessment that models this phase

FCC_A1 (O–Y)

Id: phase:o-y:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stability: not stable in 4 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:o-y:fcc-a1
tdb: tdb:YO-04Che.tdb:FCC_A1, tdb:YO-05Che.tdb:FCC_A1, tdb:YO-07Dju.tdb:FCC_A1, tdb:YO-19Xu.tdb:FCC_A1, tdb:YO-96Gro.tdb:FCC_A1, tdb:YO-98Swa-LB.tdb:FCC_A1, tdb:YO-98Swa-orig.tdb:FCC_A1

TDB models of FCC_A1 (7): PHASE and CONSTITUENT statements as written

YO-04Che.tdb: FCC_A1, type code %A, sha256 5e7b671c151efa3a…

45: PHASE FCC_A1 %A 2 1 1 !
46: CONST FCC_A1 : Y : O VA% : !

YO-05Che.tdb: FCC_A1, type code %A, sha256 3d68bece5feb27d6…

54: PHASE FCC_A1 %A 2 1 1 !
55: CONST FCC_A1 : Y : O VA% : !

YO-07Dju.tdb: FCC_A1, type code %A, sha256 c90b7972a3e43f0c…

48: PHASE FCC_A1 %A 2 1 1 !
49: CONST FCC_A1 : Y : O VA% : !

YO-19Xu.tdb: FCC_A1, type code %A, sha256 b4f395684596b2ae…

50: PHASE FCC_A1 %A 2 1 1 !
51: CONST FCC_A1 : Y : O VA% : !

YO-96Gro.tdb: FCC_A1, type code %A, sha256 5a6e383e87834517…

52: PHASE FCC_A1 %A 2 1 1 !
53: CONST FCC_A1 : Y : O VA% : !

YO-98Swa-LB.tdb: FCC_A1, type code %A, sha256 dbfb3a4c9a845450…

52: PHASE FCC_A1 %A 2 1 1 !
53: CONST FCC_A1 : Y : O VA% : !

YO-98Swa-orig.tdb: FCC_A1, type code %A, sha256 008445aaef3a7ed9…

52: PHASE FCC_A1 %A 2 1 1 !
53: CONST FCC_A1 : Y : O VA% : !

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2005.06.006 M. Chen, B. Hallstedt, L.J. Gauckler, Calphad, 29, 103-13(2005).
assessment that models this phase
doi:10.1016/j.calphad.2007.01.010 Dejan Djurovic, Matvei Zinkevich, Fritz Aldinger, Thermodynamic modeling of the yttrium–oxygen system, Calphad 31, 560-566 (2007).
assessment that models this phase
doi:10.1016/j.calphad.2018.10.007 H. Xu, M. Chen, K. Cheng, L. Zhang, Y. Du, Calphad, 64, 1-10(2019).
assessment that models this phase
doi:10.1016/j.ssi.2004.02.017 M CHEN, B HALLSTEDT, L GAUCKLER, Thermodynamic modeling of the ZrO2–YO1.5 system, Solid State Ionics 170, 255-274 (2004).
assessment that models this phase
doi:10.1016/S0925-8388(98)00245-X V. Swamy, H.J. Seifert, F. Aldinger, J. Alloys Compd., 269, 201-7(1998).
assessment that models this phase
doi:10.1515/ijmr-1996-870203 Z. Metallkd., 87, 88-91(1996).
assessment that models this phase

GAS (O–Y)

Id: phase:o-y:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 4 of 4 calculated diagram(s): 300–2500 K, x(O) 0.99968–1
Literature: 1 values (1 accepted) from 1 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:o-y:gas
paper: paper:10.1016/j.calphad.2007.01.010:gas
tdb: tdb:YO-04Che.tdb:GAS, tdb:YO-05Che.tdb:GAS, tdb:YO-07Dju.tdb:GAS, tdb:YO-19Xu.tdb:GAS, tdb:YO-96Gro.tdb:GAS, tdb:YO-98Swa-LB.tdb:GAS, tdb:YO-98Swa-orig.tdb:GAS

TDB models of GAS (7): PHASE and CONSTITUENT statements as written

YO-04Che.tdb: GAS, type code %, sha256 5e7b671c151efa3a…

73: PHASE GAS:G % 1 1 !
74: CONST GAS:G : O O2% O3 Y Y2O YO Y2O2 YO2 : !

YO-05Che.tdb: GAS, type code %, sha256 3d68bece5feb27d6…

80: PHASE GAS:G % 1 1 !
81: CONST GAS:G : O O2% O3 Y Y2O YO Y2O2 YO2 : !

YO-07Dju.tdb: GAS, type code %, sha256 c90b7972a3e43f0c…

75: PHASE GAS:G % 1 1 !
76: CONST GAS:G : O O2 O3 Y Y2O YO Y2O2 YO2 : !

YO-19Xu.tdb: GAS, type code %, sha256 b4f395684596b2ae…

77: PHASE GAS:G % 1 1 !
78: CONST GAS:G : O O2% O3 Y Y2O YO Y2O2 YO2 : !

YO-96Gro.tdb: GAS, type code %, sha256 5a6e383e87834517…

78: PHASE GAS:G % 1 1 !
79: CONST GAS:G : O O2% O3 Y Y2O YO Y2O2 YO2 : !

YO-98Swa-LB.tdb: GAS, type code %, sha256 dbfb3a4c9a845450…

78: PHASE GAS:G % 1 1 !
79: CONST GAS:G : O O2% O3 Y Y2O YO Y2O2 YO2 : !

YO-98Swa-orig.tdb: GAS, type code %, sha256 008445aaef3a7ed9…

78: PHASE GAS:G % 1 1 !
79: CONST GAS:G : O O2% O3 Y Y2O YO Y2O2 YO2 : !

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2007.01.010 Dejan Djurovic, Matvei Zinkevich, Fritz Aldinger, Thermodynamic modeling of the yttrium–oxygen system, Calphad 31, 560-566 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2005.06.006 M. Chen, B. Hallstedt, L.J. Gauckler, Calphad, 29, 103-13(2005).
assessment that models this phase
doi:10.1016/j.calphad.2018.10.007 H. Xu, M. Chen, K. Cheng, L. Zhang, Y. Du, Calphad, 64, 1-10(2019).
assessment that models this phase
doi:10.1016/j.ssi.2004.02.017 M CHEN, B HALLSTEDT, L GAUCKLER, Thermodynamic modeling of the ZrO2–YO1.5 system, Solid State Ionics 170, 255-274 (2004).
assessment that models this phase
doi:10.1016/S0925-8388(98)00245-X V. Swamy, H.J. Seifert, F. Aldinger, J. Alloys Compd., 269, 201-7(1998).
assessment that models this phase
doi:10.1515/ijmr-1996-870203 Z. Metallkd., 87, 88-91(1996).
assessment that models this phase

H_R2O3 (O–Y)

Id: phase:o-y:h-r2o3; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:H,R2O3; no_structure_token
Candidate (sgte_mmc2): H-La2O3 · hP10 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for H_R2O3: Ce2O3, H-Y2O3
Candidate (sgte_mmc2): H-La2O3 · hP10 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for H_R2O3: Dy2O3, Er2O3, Eu2O3, Gd2O3, Ho2O3, Nd2O3, Pr2O3, Sm2O3, Tb2O3, Tm2O3, Yb2O3
Candidate (sgte_mmc2): H-La2O3 · hP10 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for H_R2O3: Gd2O3, Nd2O3, Sm2O3
Candidate (sgte_mmc2): H-La2O3 · hP10 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for H_R2O3: H-La2O3, H-Y2O3
Candidate (tdb_comment): H-La2O3 · hP10 · P6_3/mmc — YO-05Che.tdb: 'Prototype H-La2O3 (hP10, P6_3/mmc)'
Candidate (tdb_comment): H-La2O3 · hP10 · P6_3/mmc — YO-96Gro.tdb: 'Prototype H-La2O3 (hP10, P6_3/mmc)'
Candidate (tdb_comment): H-La2O3 · hP10 · P6_3/mmc — YO-98Swa-LB.tdb: 'Prototype H-La2O3 (hP10, P6_3/mmc)'
Candidate (tdb_comment): H-La2O3 · hP10 · P6_3/mmc — YO-98Swa-orig.tdb: 'Prototype H-La2O3 (hP10, P6_3/mmc)'
Stability: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:o-y:h-r2o3
tdb: tdb:YO-05Che.tdb:H_R2O3, tdb:YO-07Dju.tdb:H_R2O3, tdb:YO-96Gro.tdb:H_R2O3, tdb:YO-98Swa-LB.tdb:H_R2O3, tdb:YO-98Swa-orig.tdb:H_R2O3

TDB models of H_R2O3 (5): PHASE and CONSTITUENT statements as written

YO-05Che.tdb: H_R2O3, type code %, sha256 3d68bece5feb27d6…

77: PHASE H_R2O3:I % 3 2 3 1 !
78: CONST H_R2O3:I : Y Y+3% : O-2% VA : O-2 VA% : !

YO-07Dju.tdb: H_R2O3, type code %, sha256 c90b7972a3e43f0c…

69: PHASE H_R2O3:I % 3 2 2 1 !
70: CONST H_R2O3:I : Y+2 Y+3% : O-2 : O-2% VA : !

YO-96Gro.tdb: H_R2O3, type code %, sha256 5a6e383e87834517…

75: PHASE H_R2O3:I % 2 2 3 !
76: CONST H_R2O3:I : Y+3 : O-2% VA-2 : !

YO-98Swa-LB.tdb: H_R2O3, type code %, sha256 dbfb3a4c9a845450…

75: PHASE H_R2O3:I % 2 2 3 !
76: CONST H_R2O3:I : Y+3 : O-2% VA-2 : !

YO-98Swa-orig.tdb: H_R2O3, type code %, sha256 008445aaef3a7ed9…

75: PHASE H_R2O3:I % 2 2 3 !
76: CONST H_R2O3:I : Y+3 : O-2% VA-2 : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2005.06.006 M. Chen, B. Hallstedt, L.J. Gauckler, Calphad, 29, 103-13(2005).
assessment that models this phase
doi:10.1016/j.calphad.2007.01.010 Dejan Djurovic, Matvei Zinkevich, Fritz Aldinger, Thermodynamic modeling of the yttrium–oxygen system, Calphad 31, 560-566 (2007).
assessment that models this phase
doi:10.1016/S0925-8388(98)00245-X V. Swamy, H.J. Seifert, F. Aldinger, J. Alloys Compd., 269, 201-7(1998).
assessment that models this phase
doi:10.1515/ijmr-1996-870203 Z. Metallkd., 87, 88-91(1996).
assessment that models this phase

HCP_A3 (O–Y)

Id: phase:o-y:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stability: stable in 4 of 4 calculated diagram(s): 300–1786.14 K, x(O) 0–0.15151
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:o-y:hcp-a3
paper: paper:10.1016/j.calphad.2007.01.010:α-Y
tdb: tdb:YO-04Che.tdb:HCP_A3, tdb:YO-05Che.tdb:HCP_A3, tdb:YO-07Dju.tdb:HCP_A3, tdb:YO-19Xu.tdb:HCP_A3, tdb:YO-96Gro.tdb:HCP_A3, tdb:YO-98Swa-LB.tdb:HCP_A3, tdb:YO-98Swa-orig.tdb:HCP_A3

TDB models of HCP_A3 (7): PHASE and CONSTITUENT statements as written

YO-04Che.tdb: HCP_A3, type code %A, sha256 5e7b671c151efa3a…

56: PHASE HCP_A3 %A 2 1 0.5 !
57: CONST HCP_A3 : Y : O VA% : !

YO-05Che.tdb: HCP_A3, type code %A, sha256 3d68bece5feb27d6…

65: PHASE HCP_A3 %A 2 1 0.5 !
66: CONST HCP_A3 : Y : O VA% : !

YO-07Dju.tdb: HCP_A3, type code %A, sha256 c90b7972a3e43f0c…

59: PHASE HCP_A3 %A 2 1 0.5 !
60: CONST HCP_A3 : Y% : O VA% : !

YO-19Xu.tdb: HCP_A3, type code %A, sha256 b4f395684596b2ae…

60: PHASE HCP_A3 %A 2 1 0.5 !
61: CONST HCP_A3 : Y : O VA% : !

YO-96Gro.tdb: HCP_A3, type code %A, sha256 5a6e383e87834517…

63: PHASE HCP_A3 %A 2 1 1 !
64: CONST HCP_A3 : Y : O VA% : !

YO-98Swa-LB.tdb: HCP_A3, type code %A, sha256 dbfb3a4c9a845450…

63: PHASE HCP_A3 %A 2 1 1 !
64: CONST HCP_A3 : Y : O VA% : !

YO-98Swa-orig.tdb: HCP_A3, type code %A, sha256 008445aaef3a7ed9…

63: PHASE HCP_A3 %A 2 1 1 !
64: CONST HCP_A3 : Y : O VA% : !

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2007.01.010 Dejan Djurovic, Matvei Zinkevich, Fritz Aldinger, Thermodynamic modeling of the yttrium–oxygen system, Calphad 31, 560-566 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2005.06.006 M. Chen, B. Hallstedt, L.J. Gauckler, Calphad, 29, 103-13(2005).
assessment that models this phase
doi:10.1016/j.calphad.2018.10.007 H. Xu, M. Chen, K. Cheng, L. Zhang, Y. Du, Calphad, 64, 1-10(2019).
assessment that models this phase
doi:10.1016/j.ssi.2004.02.017 M CHEN, B HALLSTEDT, L GAUCKLER, Thermodynamic modeling of the ZrO2–YO1.5 system, Solid State Ionics 170, 255-274 (2004).
assessment that models this phase
doi:10.1016/S0925-8388(98)00245-X V. Swamy, H.J. Seifert, F. Aldinger, J. Alloys Compd., 269, 201-7(1998).
assessment that models this phase
doi:10.1515/ijmr-1996-870203 Z. Metallkd., 87, 88-91(1996).
assessment that models this phase

ION (O–Y)

Id: phase:o-y:ion; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 4 of 4 calculated diagram(s): 1794.84–2500 K, x(O) 0–0.54853
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:o-y:ion
tdb: tdb:YO-04Che.tdb:ION, tdb:YO-05Che.tdb:ION, tdb:YO-07Dju.tdb:ION, tdb:YO-19Xu.tdb:ION, tdb:YO-96Gro.tdb:ION, tdb:YO-98Swa-LB.tdb:ION, tdb:YO-98Swa-orig.tdb:ION

TDB models of ION (7): PHASE and CONSTITUENT statements as written

YO-04Che.tdb: ION, type code %, sha256 5e7b671c151efa3a…

37: PHASE ION:Y % 2 1 1 !
38: CONST ION:Y : Y+3 : O-2 VA : !

YO-05Che.tdb: ION, type code %, sha256 3d68bece5feb27d6…

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

YO-07Dju.tdb: ION, type code %, sha256 c90b7972a3e43f0c…

43: PHASE ION:Y % 2 1 1 !
44: CONST ION:Y : Y+3 : O-2 VA : !

YO-19Xu.tdb: ION, type code %, sha256 b4f395684596b2ae…

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

YO-96Gro.tdb: ION, type code %, sha256 5a6e383e87834517…

44: PHASE ION:Y % 2 1 1 !
45: CONST ION:Y : Y+3 : O-2 VA O : !

YO-98Swa-LB.tdb: ION, type code %, sha256 dbfb3a4c9a845450…

44: PHASE ION:Y % 2 1 1 !
45: CONST ION:Y : Y+3 : O-2 VA O : !

YO-98Swa-orig.tdb: ION, type code %, sha256 008445aaef3a7ed9…

44: PHASE ION:Y % 2 1 1 !
45: CONST ION:Y : Y+3 : O-2 VA O : !

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2005.06.006 M. Chen, B. Hallstedt, L.J. Gauckler, Calphad, 29, 103-13(2005).
assessment that models this phase
doi:10.1016/j.calphad.2007.01.010 Dejan Djurovic, Matvei Zinkevich, Fritz Aldinger, Thermodynamic modeling of the yttrium–oxygen system, Calphad 31, 560-566 (2007).
assessment that models this phase
doi:10.1016/j.calphad.2018.10.007 H. Xu, M. Chen, K. Cheng, L. Zhang, Y. Du, Calphad, 64, 1-10(2019).
assessment that models this phase
doi:10.1016/j.ssi.2004.02.017 M CHEN, B HALLSTEDT, L GAUCKLER, Thermodynamic modeling of the ZrO2–YO1.5 system, Solid State Ionics 170, 255-274 (2004).
assessment that models this phase
doi:10.1016/S0925-8388(98)00245-X V. Swamy, H.J. Seifert, F. Aldinger, J. Alloys Compd., 269, 201-7(1998).
assessment that models this phase
doi:10.1515/ijmr-1996-870203 Z. Metallkd., 87, 88-91(1996).
assessment that models this phase

LIQUID (O–Y)

Id: phase:o-y:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 4 calculated diagram(s): 1780.01–2500 K, x(O) 0–0.53939
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:o-y:liquid
paper: paper:10.1016/j.calphad.2007.01.010:L
tdb: tdb:YO-04Che.tdb:LIQUID, tdb:YO-05Che.tdb:LIQUID, tdb:YO-07Dju.tdb:LIQUID, tdb:YO-19Xu.tdb:LIQUID, tdb:YO-96Gro.tdb:LIQUID, tdb:YO-98Swa-LB.tdb:LIQUID, tdb:YO-98Swa-orig.tdb:LIQUID

TDB models of LIQUID (7): PHASE and CONSTITUENT statements as written

YO-04Che.tdb: LIQUID, type code %, sha256 5e7b671c151efa3a…

40: PHASE LIQUID:L % 1 1 !
41: CONST LIQUID:L : Y : !

YO-05Che.tdb: LIQUID, type code %, sha256 3d68bece5feb27d6…

49: PHASE LIQUID:L % 1 1 !
50: CONST LIQUID:L : Y : !

YO-07Dju.tdb: LIQUID, type code %, sha256 c90b7972a3e43f0c…

40: PHASE LIQUID:L % 1 1 !
41: CONST LIQUID:L : Y YO1.5 : !

YO-19Xu.tdb: LIQUID, type code %, sha256 b4f395684596b2ae…

45: PHASE LIQUID:L % 1 1 !
46: CONST LIQUID:L : Y : !

YO-96Gro.tdb: LIQUID, type code %, sha256 5a6e383e87834517…

47: PHASE LIQUID:L % 1 1 !
48: CONST LIQUID:L : Y : !

YO-98Swa-LB.tdb: LIQUID, type code %, sha256 dbfb3a4c9a845450…

47: PHASE LIQUID:L % 1 1 !
48: CONST LIQUID:L : Y : !

YO-98Swa-orig.tdb: LIQUID, type code %, sha256 008445aaef3a7ed9…

47: PHASE LIQUID:L % 1 1 !
48: CONST LIQUID:L : Y : !

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2007.01.010 Dejan Djurovic, Matvei Zinkevich, Fritz Aldinger, Thermodynamic modeling of the yttrium–oxygen system, Calphad 31, 560-566 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2005.06.006 M. Chen, B. Hallstedt, L.J. Gauckler, Calphad, 29, 103-13(2005).
assessment that models this phase
doi:10.1016/j.calphad.2018.10.007 H. Xu, M. Chen, K. Cheng, L. Zhang, Y. Du, Calphad, 64, 1-10(2019).
assessment that models this phase
doi:10.1016/j.ssi.2004.02.017 M CHEN, B HALLSTEDT, L GAUCKLER, Thermodynamic modeling of the ZrO2–YO1.5 system, Solid State Ionics 170, 255-274 (2004).
assessment that models this phase
doi:10.1016/S0925-8388(98)00245-X V. Swamy, H.J. Seifert, F. Aldinger, J. Alloys Compd., 269, 201-7(1998).
assessment that models this phase
doi:10.1515/ijmr-1996-870203 Z. Metallkd., 87, 88-91(1996).
assessment that models this phase

O2GAS (O–Y)

Id: phase:o-y:o2gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 4 of 4 calculated diagram(s): 300–1185 K, x(O) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:o-y:o2gas
tdb: tdb:YO-04Che.tdb:O2GAS, tdb:YO-05Che.tdb:O2GAS, tdb:YO-07Dju.tdb:O2GAS, tdb:YO-19Xu.tdb:O2GAS, tdb:YO-96Gro.tdb:O2GAS, tdb:YO-98Swa-LB.tdb:O2GAS, tdb:YO-98Swa-orig.tdb:O2GAS

TDB models of O2GAS (7): PHASE and CONSTITUENT statements as written

YO-04Che.tdb: O2GAS, type code %, sha256 5e7b671c151efa3a…

76: PHASE O2GAS % 1 1 !
77: CONST O2GAS : O2 : !

YO-05Che.tdb: O2GAS, type code %, sha256 3d68bece5feb27d6…

83: PHASE O2GAS % 1 1 !
84: CONST O2GAS : O2 : !

YO-07Dju.tdb: O2GAS, type code %, sha256 c90b7972a3e43f0c…

72: PHASE O2GAS % 1 1 !
73: CONST O2GAS : O2 :!

YO-19Xu.tdb: O2GAS, type code %, sha256 b4f395684596b2ae…

80: PHASE O2GAS % 1 1 !
81: CONST O2GAS : O2 : !

YO-96Gro.tdb: O2GAS, type code %, sha256 5a6e383e87834517…

81: PHASE O2GAS % 1 1 !
82: CONST O2GAS : O2 : !

YO-98Swa-LB.tdb: O2GAS, type code %, sha256 dbfb3a4c9a845450…

81: PHASE O2GAS % 1 1 !
82: CONST O2GAS : O2 : !

YO-98Swa-orig.tdb: O2GAS, type code %, sha256 008445aaef3a7ed9…

81: PHASE O2GAS % 1 1 !
82: CONST O2GAS : O2 : !

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2005.06.006 M. Chen, B. Hallstedt, L.J. Gauckler, Calphad, 29, 103-13(2005).
assessment that models this phase
doi:10.1016/j.calphad.2007.01.010 Dejan Djurovic, Matvei Zinkevich, Fritz Aldinger, Thermodynamic modeling of the yttrium–oxygen system, Calphad 31, 560-566 (2007).
assessment that models this phase
doi:10.1016/j.calphad.2018.10.007 H. Xu, M. Chen, K. Cheng, L. Zhang, Y. Du, Calphad, 64, 1-10(2019).
assessment that models this phase
doi:10.1016/j.ssi.2004.02.017 M CHEN, B HALLSTEDT, L GAUCKLER, Thermodynamic modeling of the ZrO2–YO1.5 system, Solid State Ionics 170, 255-274 (2004).
assessment that models this phase
doi:10.1016/S0925-8388(98)00245-X V. Swamy, H.J. Seifert, F. Aldinger, J. Alloys Compd., 269, 201-7(1998).
assessment that models this phase
doi:10.1515/ijmr-1996-870203 Z. Metallkd., 87, 88-91(1996).
assessment that models this phase

H_Y2O3 (O–Y)

Id: phase:o-y:y2o3-h; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:H; no_structure_token
Candidate (tdb_comment): H-La2O3 · hP10 · P6_3/mmc — YO-04Che.tdb: 'Prototype H-La2O3 (hP10, P6_3/mmc)'
Candidate (tdb_comment): H-La2O3 · hP10 · P6_3/mmc — YO-19Xu.tdb: 'Prototype H-La2O3 (hP10, P6_3/mmc)'
Stability: stable in 2 of 2 calculated diagram(s): 2470–2500 K
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:o-y:y2o3-h
tdb: tdb:YO-04Che.tdb:H_Y2O3, tdb:YO-19Xu.tdb:H_Y2O3

TDB models of H_Y2O3 (2): PHASE and CONSTITUENT statements as written

YO-04Che.tdb: H_Y2O3, type code %, sha256 5e7b671c151efa3a…

70: PHASE H_Y2O3:I % 2 1 2 !
71: CONST H_Y2O3:I : Y Y+3% : O-2% VA : !

YO-19Xu.tdb: H_Y2O3, type code %, sha256 b4f395684596b2ae…

74: PHASE H_Y2O3:I % 2 1 2 !
75: CONST H_Y2O3:I : Y Y+3% : O-2% VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2018.10.007 H. Xu, M. Chen, K. Cheng, L. Zhang, Y. Du, Calphad, 64, 1-10(2019).
assessment that models this phase
doi:10.1016/j.ssi.2004.02.017 M CHEN, B HALLSTEDT, L GAUCKLER, Thermodynamic modeling of the ZrO2–YO1.5 system, Solid State Ionics 170, 255-274 (2004).
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}
}