O–Pr phases

15 phases (tier A 3, tier C 9, liquid 1, gas 2); 13 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: interactive registry · full JSON · O–Pr system page · Markdown · field reference

Phases of the O–Pr system (15)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:o-pr:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1197–2499 K, x(O) 0–0	2
A_R2O3_D52 phase:o-pr:d52-a-r2o3	A-La2O3 · D5_2 · hP5 · P-3m1 (164)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1055 K, x(O) 0.6–0.6	2
C_R2O3_D53 phase:o-pr:d53-c-r2o3	Mn2O3 · D5_3 · cI80 · Ia-3 (206)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	not stable in 1 calculated diagram(s)	1
DHCP phase:o-pr:dhcp-a3	alpha-La · A3' · hP4 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1055 K, x(O) 0–0	2
GAS phase:o-pr:gas	gas	gas	stable in 2 of 2 calculated diagram(s): 2175–2500 K, x(O) 1–1	2
H_R2O3 phase:o-pr:h-r2o3	H-La2O3 · hP10 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	not stable in 2 calculated diagram(s)	2
ION phase:o-pr:ion	liquid	liquid	stable in 2 of 2 calculated diagram(s): 1197–2500 K, x(O) 0–0.62282	2
O2GAS phase:o-pr:o2gas	gas	gas	stable in 2 of 2 calculated diagram(s): 300–1185.1 K, x(O) 1–1	2
PR10O18 phase:o-pr:pr10o18	Pr10O18 · mP112 · P2_1/c (14)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300.05–849.15 K, x(O) 0.64286–0.64286	1
PR11O20 phase:o-pr:pr11o20	Tb11O20 · aP31 · P-1 (2)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 681.3–771.95 K, x(O) 0.64516–0.64516	1
PR6O11 phase:o-pr:pr6o11	Pr6O11 · mP68 · P2_1/c (14)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–746.33 K, x(O) 0.64706–0.64706	1
PR7O12 phase:o-pr:pr7o12	Pr7O12 · hR19 · R-3 (148)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–315 K, x(O) 0.63158–0.63158	1
PR9O16 phase:o-pr:pr9o16	Pr9O16 · aP25 · P-1 (2)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 564.15–874.15 K, x(O) 0.64–0.64	1
PRO2_C1 phase:o-pr:pro2-c1	CaF2 · C1 · cF12 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1185.1 K, x(O) 0.63679–0.66667	1
X_R2O3 phase:o-pr:r2o3-x	Nd2O3 · cI26 · Im-3m (229)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 2 calculated diagram(s): 2445–2500 K, x(O) 0.6–0.6	2

BCC_A2 (O–Pr)

Id: phase:o-pr:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stoichiometry: Pr 1.0000
Stability: stable in 2 of 2 calculated diagram(s): 1197–2499 K, x(O) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:o-pr:bcc-a2
tdb: tdb:PrO-16McM.tdb:BCC_A2, tdb:PrO-23Nak.tdb:BCC_A2

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

PrO-16McM.tdb: BCC_A2, type code %B, sha256 fd82f7ae5dbcbe77…

42: PHASE BCC_A2 %B 2 1 3 !
43: CONST BCC_A2 : PR : VA : !

PrO-23Nak.tdb: BCC_A2, type code %B, sha256 b6f76e9bff832536…

38: PHASE BCC_A2 %B 2 1 3 !
39: CONST BCC_A2 : PR : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2023.102636 R. Nakazawa, A. Itoh, S. Yasui, M. Kurata, Y. Kobayashi, Calphad, 83, 102636(2023).
assessment that models this phase
doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

A_R2O3_D52 (O–Pr)

Id: phase:o-pr: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: stable in 2 of 2 calculated diagram(s): 300–1055 K, x(O) 0.6–0.6
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:o-pr:d52-a-r2o3
tdb: tdb:PrO-16McM.tdb:A_R2O3_D52, tdb:PrO-23Nak.tdb:A_R2O3_D52

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

PrO-16McM.tdb: A_R2O3_D52, type code %, sha256 fd82f7ae5dbcbe77…

52: PHASE A_R2O3_D52:I % 2 2 3 !
53: CONST A_R2O3_D52:I : PR+3 : O-2 : !

PrO-23Nak.tdb: A_R2O3_D52, type code %, sha256 b6f76e9bff832536…

48: PHASE A_R2O3_D52:I % 2 2 3 !
49: CONST A_R2O3_D52:I : PR+3 : O-2 : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2023.102636 R. Nakazawa, A. Itoh, S. Yasui, M. Kurata, Y. Kobayashi, Calphad, 83, 102636(2023).
assessment that models this phase
doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

C_R2O3_D53 (O–Pr)

Id: phase:o-pr: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 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-pr:d53-c-r2o3
tdb: tdb:PrO-16McM.tdb:C_R2O3_D53

TDB models of C_R2O3_D53 (1): PHASE and CONSTITUENT statements as written

PrO-16McM.tdb: C_R2O3_D53, type code %, sha256 fd82f7ae5dbcbe77…

92: PHASE C_R2O3_D53:I % 3 2 3 1 !
93: CONST C_R2O3_D53:I : PR+3 PR+4 : O-2 : O-2 VA : !

Example references (1 of 1; assessments first):

doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

DHCP (O–Pr)

Id: phase:o-pr: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
Stoichiometry: Pr 1.0000
Stability: stable in 2 of 2 calculated diagram(s): 300–1055 K, x(O) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:o-pr:dhcp-a3
tdb: tdb:PrO-16McM.tdb:DHCP, tdb:PrO-23Nak.tdb:DHCP

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

PrO-16McM.tdb: DHCP, type code %, sha256 fd82f7ae5dbcbe77…

47: PHASE DHCP % 1 1 !
48: CONST DHCP : PR : !

PrO-23Nak.tdb: DHCP, type code %, sha256 b6f76e9bff832536…

43: PHASE DHCP % 1 1 !
44: CONST DHCP : PR : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2023.102636 R. Nakazawa, A. Itoh, S. Yasui, M. Kurata, Y. Kobayashi, Calphad, 83, 102636(2023).
assessment that models this phase
doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

GAS (O–Pr)

Id: phase:o-pr:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 2175–2500 K, x(O) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:o-pr:gas
tdb: tdb:PrO-16McM.tdb:GAS, tdb:PrO-23Nak.tdb:GAS

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

PrO-16McM.tdb: GAS, type code %, sha256 fd82f7ae5dbcbe77…

100: PHASE GAS:G % 1 1 !
101: CONST GAS:G : O O2 O3 PR PRO : !

PrO-23Nak.tdb: GAS, type code %, sha256 b6f76e9bff832536…

61: PHASE GAS:G % 1 1 !
62: CONST GAS:G : O O2 O3 PR PRO : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2023.102636 R. Nakazawa, A. Itoh, S. Yasui, M. Kurata, Y. Kobayashi, Calphad, 83, 102636(2023).
assessment that models this phase
doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

H_R2O3 (O–Pr)

Id: phase:o-pr: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: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:o-pr:h-r2o3
tdb: tdb:PrO-16McM.tdb:H_R2O3, tdb:PrO-23Nak.tdb:H_R2O3

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

PrO-16McM.tdb: H_R2O3, type code %, sha256 fd82f7ae5dbcbe77…

57: PHASE H_R2O3:I % 2 2 3 !
58: CONST H_R2O3:I : PR+3 : O-2 : !

PrO-23Nak.tdb: H_R2O3, type code %, sha256 b6f76e9bff832536…

53: PHASE H_R2O3:I % 2 2 3 !
54: CONST H_R2O3:I : PR+3 : O-2 : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2023.102636 R. Nakazawa, A. Itoh, S. Yasui, M. Kurata, Y. Kobayashi, Calphad, 83, 102636(2023).
assessment that models this phase
doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

ION (O–Pr)

Id: phase:o-pr:ion; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1197–2500 K, x(O) 0–0.62282
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:o-pr:ion
tdb: tdb:PrO-16McM.tdb:ION, tdb:PrO-23Nak.tdb:ION

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

PrO-16McM.tdb: ION, type code %, sha256 fd82f7ae5dbcbe77…

37: PHASE ION:Y % 2 1 1 !
38: CONST ION:Y : PR+3 PR+4 : O-2 VA O : !

PrO-23Nak.tdb: ION, type code %, sha256 b6f76e9bff832536…

33: PHASE ION:Y % 2 1 1 !
34: CONST ION:Y : PR+3 : O-2 VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2023.102636 R. Nakazawa, A. Itoh, S. Yasui, M. Kurata, Y. Kobayashi, Calphad, 83, 102636(2023).
assessment that models this phase
doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

O2GAS (O–Pr)

Id: phase:o-pr:o2gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–1185.1 K, x(O) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:o-pr:o2gas
tdb: tdb:PrO-16McM.tdb:O2GAS, tdb:PrO-23Nak.tdb:O2GAS

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

PrO-16McM.tdb: O2GAS, type code %, sha256 fd82f7ae5dbcbe77…

103: PHASE O2GAS % 1 1 !
104: CONST O2GAS : O2 : !

PrO-23Nak.tdb: O2GAS, type code %, sha256 b6f76e9bff832536…

64: PHASE O2GAS % 1 1 !
65: CONST O2GAS : O2 : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2023.102636 R. Nakazawa, A. Itoh, S. Yasui, M. Kurata, Y. Kobayashi, Calphad, 83, 102636(2023).
assessment that models this phase
doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

PR10O18 (O–Pr)

Id: phase:o-pr:pr10o18; status assigned
Structure: Pr10O18 · mP112 · P2_1/c (14); type st:pr10o18-mp112; 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 1 of 1 calculated diagram(s): 300.05–849.15 K, x(O) 0.64286–0.64286
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-pr:pr10o18
tdb: tdb:PrO-16McM.tdb:PR10O18

TDB models of PR10O18 (1): PHASE and CONSTITUENT statements as written

PrO-16McM.tdb: PR10O18, type code %, sha256 fd82f7ae5dbcbe77…

77: PHASE PR10O18:I % 3 4 6 18 !
78: CONST PR10O18:I : PR+3 : PR+4 : O-2 : !

Example references (1 of 1; assessments first):

doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

PR11O20 (O–Pr)

Id: phase:o-pr:pr11o20; 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 1 of 1 calculated diagram(s): 681.3–771.95 K, x(O) 0.64516–0.64516
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-pr:pr11o20
tdb: tdb:PrO-16McM.tdb:PR11O20

TDB models of PR11O20 (1): PHASE and CONSTITUENT statements as written

PrO-16McM.tdb: PR11O20, type code %, sha256 fd82f7ae5dbcbe77…

82: PHASE PR11O20:I % 3 4 7 20 !
83: CONST PR11O20:I : PR+3 : PR+4 : O-2 : !

Example references (1 of 1; assessments first):

doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

PR6O11 (O–Pr)

Id: phase:o-pr:pr6o11; status assigned
Structure: Pr6O11 · mP68 · P2_1/c (14); type st:pr6o11-mp68; 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 1 of 1 calculated diagram(s): 300–746.33 K, x(O) 0.64706–0.64706
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-pr:pr6o11
tdb: tdb:PrO-16McM.tdb:PR6O11

TDB models of PR6O11 (1): PHASE and CONSTITUENT statements as written

PrO-16McM.tdb: PR6O11, type code %, sha256 fd82f7ae5dbcbe77…

87: PHASE PR6O11:I % 3 2 4 11 !
88: CONST PR6O11:I : PR+3 : PR+4 : O-2 : !

Example references (1 of 1; assessments first):

doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

PR7O12 (O–Pr)

Id: phase:o-pr:pr7o12; 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 1 of 1 calculated diagram(s): 300–315 K, x(O) 0.63158–0.63158
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-pr:pr7o12
tdb: tdb:PrO-16McM.tdb:PR7O12

TDB models of PR7O12 (1): PHASE and CONSTITUENT statements as written

PrO-16McM.tdb: PR7O12, type code %, sha256 fd82f7ae5dbcbe77…

67: PHASE PR7O12:I % 3 4 3 12 !
68: CONST PR7O12:I : PR+3 : PR+4 : O-2 : !

Example references (1 of 1; assessments first):

doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

PR9O16 (O–Pr)

Id: phase:o-pr:pr9o16; status assigned
Structure: Pr9O16 · aP25 · P-1 (2); type st:pr9o16-ap25; 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 1 of 1 calculated diagram(s): 564.15–874.15 K, x(O) 0.64–0.64
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-pr:pr9o16
tdb: tdb:PrO-16McM.tdb:PR9O16

TDB models of PR9O16 (1): PHASE and CONSTITUENT statements as written

PrO-16McM.tdb: PR9O16, type code %, sha256 fd82f7ae5dbcbe77…

72: PHASE PR9O16:I % 3 4 5 16 !
73: CONST PR9O16:I : PR+3 : PR+4 : O-2 : !

Example references (1 of 1; assessments first):

doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

PRO2_C1 (O–Pr)

Id: phase:o-pr:pro2-c1; status assigned
Structure: CaF2 · C1 · cF12 · Fm-3m (225); type st:c1-caf2-cf12; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1185.1 K, x(O) 0.63679–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-pr:pro2-c1
tdb: tdb:PrO-16McM.tdb:PRO2_C1

TDB models of PRO2_C1 (1): PHASE and CONSTITUENT statements as written

PrO-16McM.tdb: PRO2_C1, type code %, sha256 fd82f7ae5dbcbe77…

97: PHASE PRO2_C1:I % 3 1 2 1 !
98: CONST PRO2_C1:I : PR+3 PR+4 : O-2 VA : O-2 VA : !

Example references (1 of 1; assessments first):

doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
assessment that models this phase

X_R2O3 (O–Pr)

Id: phase:o-pr: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 1 of 2 calculated diagram(s): 2445–2500 K, x(O) 0.6–0.6
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:o-pr:r2o3-x
tdb: tdb:PrO-16McM.tdb:X_R2O3, tdb:PrO-23Nak.tdb:X_R2O3

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

PrO-16McM.tdb: X_R2O3, type code %, sha256 fd82f7ae5dbcbe77…

62: PHASE X_R2O3:I % 2 2 3 !
63: CONST X_R2O3:I : PR+3 : O-2 : !

PrO-23Nak.tdb: X_R2O3, type code %, sha256 b6f76e9bff832536…

58: PHASE X_R2O3:I % 2 2 3 !
59: CONST X_R2O3:I : PR+3 : O-2 : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2023.102636 R. Nakazawa, A. Itoh, S. Yasui, M. Kurata, Y. Kobayashi, Calphad, 83, 102636(2023).
assessment that models this phase
doi:10.1111/jace.14049 J.W. McMurray, J. Am. Ceram. Soc., 99, 1092-99(2016).
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}
}