# O–Pr phases > O–Pr system: 15 phases (tier A 3, tier C 9, liquid 1, gas 2); 13 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/O-PR.html · Markdown: https://data.orchid-project.org/phases/pages/O-PR.md 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](https://orchid-project.org/phases/?q=O-PR) · [full JSON](https://data.orchid-project.org/phases/systems/O-PR.json) · [O–Pr system page](https://data.orchid-project.org/systems/O-PR.html) · [Markdown](https://data.orchid-project.org/phases/pages/O-PR.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the O–Pr system (15) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [BCC_A2](#phase-o-pr-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 | 0 | 2 | | [A_R2O3_D52](#phase-o-pr-d52-a-r2o3); _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 | 0 | 2 | | [C_R2O3_D53](#phase-o-pr-d53-c-r2o3); _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) | 0 | 1 | | [DHCP](#phase-o-pr-dhcp-a3); _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 | 0 | 2 | | [GAS](#phase-o-pr-gas); _phase:o-pr:gas_ | gas | gas | stable in 2 of 2 calculated diagram(s): 2175–2500 K, x(O) 1–1 | 0 | 2 | | [H_R2O3](#phase-o-pr-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) | 0 | 2 | | [ION](#phase-o-pr-ion); _phase:o-pr:ion_ | liquid | liquid | stable in 2 of 2 calculated diagram(s): 1197–2500 K, x(O) 0–0.62282 | 0 | 2 | | [O2GAS](#phase-o-pr-o2gas); _phase:o-pr:o2gas_ | gas | gas | stable in 2 of 2 calculated diagram(s): 300–1185.1 K, x(O) 1–1 | 0 | 2 | | [PR10O18](#phase-o-pr-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 | 0 | 1 | | [PR11O20](#phase-o-pr-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 | 0 | 1 | | [PR6O11](#phase-o-pr-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 | 0 | 1 | | [PR7O12](#phase-o-pr-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 | 0 | 1 | | [PR9O16](#phase-o-pr-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 | 0 | 1 | | [PRO2_C1](#phase-o-pr-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 | 0 | 1 | | [X_R2O3](#phase-o-pr-r2o3-x); _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 | 0 | 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](https://orchid-project.org/phases/#phase:o-pr:bcc-a2) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): BCC_A2, type code %B, sha256 `fd82f7ae5dbcbe77…` ~~~~text 42: PHASE BCC_A2 %B 2 1 3 ! 43: CONST BCC_A2 : PR : VA : ! ~~~~ [PrO-23Nak.tdb](https://orchid-project.org/data/databases/sgte-binary/PrO-23Nak.tdb): BCC_A2, type code %B, sha256 `b6f76e9bff832536…` ~~~~text 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](https://doi.org/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](https://doi.org/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](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: 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](https://orchid-project.org/phases/#phase:o-pr:d52-a-r2o3) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): A_R2O3_D52, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 52: PHASE A_R2O3_D52:I % 2 2 3 ! 53: CONST A_R2O3_D52:I : PR+3 : O-2 : ! ~~~~ [PrO-23Nak.tdb](https://orchid-project.org/data/databases/sgte-binary/PrO-23Nak.tdb): A_R2O3_D52, type code %, sha256 `b6f76e9bff832536…` ~~~~text 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](https://doi.org/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](https://doi.org/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](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 1 calculated diagram(s) - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-pr:d53-c-r2o3) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): C_R2O3_D53, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 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](https://doi.org/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](https://orchid-project.org/phases/#phase:o-pr:dhcp-a3) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): DHCP, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 47: PHASE DHCP % 1 1 ! 48: CONST DHCP : PR : ! ~~~~ [PrO-23Nak.tdb](https://orchid-project.org/data/databases/sgte-binary/PrO-23Nak.tdb): DHCP, type code %, sha256 `b6f76e9bff832536…` ~~~~text 43: PHASE DHCP % 1 1 ! 44: CONST DHCP : PR : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/j.calphad.2023.102636](https://doi.org/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](https://doi.org/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](https://orchid-project.org/phases/#phase:o-pr:gas) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): GAS, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 100: PHASE GAS:G % 1 1 ! 101: CONST GAS:G : O O2 O3 PR PRO : ! ~~~~ [PrO-23Nak.tdb](https://orchid-project.org/data/databases/sgte-binary/PrO-23Nak.tdb): GAS, type code %, sha256 `b6f76e9bff832536…` ~~~~text 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](https://doi.org/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](https://doi.org/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](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: 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:o-pr:h-r2o3) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): H_R2O3, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 57: PHASE H_R2O3:I % 2 2 3 ! 58: CONST H_R2O3:I : PR+3 : O-2 : ! ~~~~ [PrO-23Nak.tdb](https://orchid-project.org/data/databases/sgte-binary/PrO-23Nak.tdb): H_R2O3, type code %, sha256 `b6f76e9bff832536…` ~~~~text 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](https://doi.org/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](https://doi.org/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](https://orchid-project.org/phases/#phase:o-pr:ion) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): ION, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 37: PHASE ION:Y % 2 1 1 ! 38: CONST ION:Y : PR+3 PR+4 : O-2 VA O : ! ~~~~ [PrO-23Nak.tdb](https://orchid-project.org/data/databases/sgte-binary/PrO-23Nak.tdb): ION, type code %, sha256 `b6f76e9bff832536…` ~~~~text 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](https://doi.org/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](https://doi.org/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](https://orchid-project.org/phases/#phase:o-pr:o2gas) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): O2GAS, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 103: PHASE O2GAS % 1 1 ! 104: CONST O2GAS : O2 : ! ~~~~ [PrO-23Nak.tdb](https://orchid-project.org/data/databases/sgte-binary/PrO-23Nak.tdb): O2GAS, type code %, sha256 `b6f76e9bff832536…` ~~~~text 64: PHASE O2GAS % 1 1 ! 65: CONST O2GAS : O2 : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/j.calphad.2023.102636](https://doi.org/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](https://doi.org/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](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 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](https://orchid-project.org/phases/#phase:o-pr:pr10o18) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): PR10O18, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 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](https://doi.org/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](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 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](https://orchid-project.org/phases/#phase:o-pr:pr11o20) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): PR11O20, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 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](https://doi.org/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](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 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](https://orchid-project.org/phases/#phase:o-pr:pr6o11) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): PR6O11, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 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](https://doi.org/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](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 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](https://orchid-project.org/phases/#phase:o-pr:pr7o12) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): PR7O12, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 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](https://doi.org/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](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 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](https://orchid-project.org/phases/#phase:o-pr:pr9o16) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): PR9O16, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 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](https://doi.org/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](https://orchid-project.org/phases/#phase:o-pr:pro2-c1) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): PRO2_C1, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 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](https://doi.org/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](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 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](https://orchid-project.org/phases/#phase:o-pr:r2o3-x) 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](https://orchid-project.org/data/databases/sgte-binary/PrO-16McM.tdb): X_R2O3, type code %, sha256 `fd82f7ae5dbcbe77…` ~~~~text 62: PHASE X_R2O3:I % 2 2 3 ! 63: CONST X_R2O3:I : PR+3 : O-2 : ! ~~~~ [PrO-23Nak.tdb](https://orchid-project.org/data/databases/sgte-binary/PrO-23Nak.tdb): X_R2O3, type code %, sha256 `b6f76e9bff832536…` ~~~~text 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](https://doi.org/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](https://doi.org/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). 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).