# Mg–O phases > Mg–O system: 8 phases (tier A 4, liquid 2, gas 2); 5 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/MG-O.html · Markdown: https://data.orchid-project.org/phases/pages/MG-O.md 8 phases (tier A 4, liquid 2, gas 2); 5 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=MG-O) · [full JSON](https://data.orchid-project.org/phases/systems/MG-O.json) · [Mg–O system page](https://data.orchid-project.org/systems/MG-O.html) · [Markdown](https://data.orchid-project.org/phases/pages/MG-O.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the Mg–O system (8) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [B1_OXIDE](#phase-mg-o-b1-oxide); _phase:mg-o:b1-oxide_ | NaCl · B1 · cF8 · Fm-3m (225) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–2500 K, x(O) 0.5–0.5 | 14 | 3 | | [BCC_A2](#phase-mg-o-bcc-a2); _phase:mg-o:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | not stable in 2 calculated diagram(s) | 0 | 3 | | [FCC_A1](#phase-mg-o-fcc-a1); _phase:mg-o:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | not stable in 2 calculated diagram(s) | 0 | 3 | | [GAS](#phase-mg-o-gas); _phase:mg-o:gas_ | gas | gas | stable in 2 of 2 calculated diagram(s): 1372.5–2500 K, x(O) 0–1 | 0 | 3 | | [HCP_A3](#phase-mg-o-hcp-a3); _phase:mg-o:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–925 K, x(O) 0–0 | 0 | 3 | | [ION](#phase-mg-o-ion); _phase:mg-o:ion_ | liquid | liquid | stable in 1 of 2 calculated diagram(s): 922–925 K, x(O) 0–0.0012 | 0 | 3 | | [LIQUID](#phase-mg-o-liquid); _phase:mg-o:liquid_ | liquid | liquid | not stable in 2 calculated diagram(s) | 27 | 3 | | [O2GAS](#phase-mg-o-o2gas); _phase:mg-o:o2gas_ | gas | gas | stable in 2 of 2 calculated diagram(s): 300–797.5 K, x(O) 1–1 | 0 | 3 | ## B1_OXIDE (Mg–O) - Id: `phase:mg-o:b1-oxide`; status `assigned` - Structure: NaCl · B1 · cF8 · Fm-3m (225); type `st:b1-nacl-cf8`; tier A: standard phase name; confidence high - Stability: stable in 2 of 2 calculated diagram(s): 300–2500 K, x(O) 0.5–0.5 - Literature: 14 values (14 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-o:b1-oxide) Names (5): _corpus: _corpus:phase:mg-o:b1-oxide _paper: _paper:10.1016/j.jeurceramsoc.2018.06.015:MgO _tdb: _tdb:MgO-18Lia.tdb:B1_OXIDE, tdb:MgO-23Li.tdb:B1_OXIDE, tdb:MgO-93Hal-LB.tdb:B1_OXIDE ### TDB models of B1_OXIDE (3): PHASE and CONSTITUENT statements as written [MgO-18Lia.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-18Lia.tdb): B1_OXIDE, type code %, sha256 `28bd068049e41b57…` ~~~~text 62: PHASE B1_OXIDE:I % 2 1 1 ! 63: CONST B1_OXIDE:I : MG+2 : O-2 : ! ~~~~ [MgO-23Li.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-23Li.tdb): B1_OXIDE, type code %, sha256 `d795b07d34aedd0d…` ~~~~text 56: PHASE B1_OXIDE:I % 2 1 1 ! 57: CONST B1_OXIDE:I : MG+2 : O-2 : ! ~~~~ [MgO-93Hal-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-93Hal-LB.tdb): B1_OXIDE, type code %, sha256 `b656673952720e19…` ~~~~text 63: PHASE B1_OXIDE:I % 2 1 1 ! 64: CONST B1_OXIDE:I : MG+2 : O-2 : ! ~~~~ Example references (10 of 10; assessments first): - [doi:10.1016/j.jeurceramsoc.2018.06.015](https://doi.org/10.1016/j.jeurceramsoc.2018.06.015) Song-Mao Liang, Rainer Schmid-Fetzer, Complete thermodynamic description of the Mg-Ca-O phase diagram including the Ca-O, Mg-O and CaO-MgO subsystems, Journal of the European Ceramic Society 38, 4768-4785 (2018). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/0364-5916(93)90006-W](https://doi.org/10.1016/0364-5916%2893%2990006-W) B. Hallstedt, Calphad, 17, 281-86(1993). _assessment that models this phase_ - [doi:10.2298/JMMB230621034L](https://doi.org/10.2298/JMMB230621034L) X.-J. Li, S.-H. Liu, J. Mining Metall. B, 59, 395-405(2023). _assessment that models this phase_ - [doi:10.1351/pac198254030681](https://doi.org/10.1351/pac198254030681) J. Hlavac, Melting temperatures of refractory oxides: Part I, Pure and Applied Chemistry 54, 681-688 (1982). _cited as the source of values for this phase_ - [doi:10.1002/zaac.19130820131](https://doi.org/10.1002/zaac.19130820131) Otto Ruff, Arbeiten im Gebiet hoher Temperaturen I. Über das Schmelzen und Verdampfen unserer feuerbeständigsten Oxyde im elektrischen Vakuumofen, Z. Anorg. Chem. 82, 373-400 (1913). _cited as the source of values for this phase_ - [doi:10.1007/bf02874914](https://doi.org/10.1007/bf02874914) H. A. Wriedt, The Mg−O (Magnesium-Oxygen) system, Bulletin of Alloy Phase Diagrams 8, 227-233 (1987). _cited as the source of values for this phase_ - [doi:10.1016/0016-7037(87)90009-3](https://doi.org/10.1016/0016-7037%2887%2990009-3) Milton Blander, Arthur D. Pelton, Thermodynamic analysis of binary liquid silicates and prediction of ternary solution properties by modified quasichemical equations, Geochimica et Cosmochimica Acta 51, 85-95 (1987). _cited as the source of values for this phase_ - [doi:10.1016/0040-6031(93)80422-7](https://doi.org/10.1016/0040-6031%2893%2980422-7) A.P. Chernyshev, V.A. Petrov, V.E. Titov, A.Yu. Vorobyev, Thermal radiative properties of magnesium oxide at high temperatures, Thermochimica Acta 218, 195-209 (1993). _cited as the source of values for this phase_ - [doi:10.1016/0364-5916(89)90006-0](https://doi.org/10.1016/0364-5916%2889%2990006-0) M. Hillert, X. Wang, Thermodynamic calculation of the CaO–MgO system, Calphad 13 (1989) 267–271, http://dx.doi.org/10.1016/0364-5916(89)90006-0. _cited as the source of values for this phase_ - [doi:10.1063/1.1398069](https://doi.org/10.1063/1.1398069) Claudio Ronchi, Mikhail Sheindlin, Melting point of MgO, Journal of Applied Physics 90, 3325-3331 (2001). _cited as the source of values for this phase_ ## BCC_A2 (Mg–O) - Id: `phase:mg-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: 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:mg-o:bcc-a2) Names (4): _corpus: _corpus:phase:mg-o:bcc-a2 _tdb: _tdb:MgO-18Lia.tdb:BCC_A2, tdb:MgO-23Li.tdb:BCC_A2, tdb:MgO-93Hal-LB.tdb:BCC_A2 ### TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written [MgO-18Lia.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-18Lia.tdb): BCC_A2, type code %B, sha256 `28bd068049e41b57…` ~~~~text 52: PHASE BCC_A2 %B 2 1 3 ! 53: CONST BCC_A2 : MG O : VA : ! ~~~~ [MgO-23Li.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-23Li.tdb): BCC_A2, type code %B, sha256 `d795b07d34aedd0d…` ~~~~text 46: PHASE BCC_A2 %B 2 1 3 ! 47: CONST BCC_A2 : MG : VA : ! ~~~~ [MgO-93Hal-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-93Hal-LB.tdb): BCC_A2, type code %B, sha256 `b656673952720e19…` ~~~~text 53: PHASE BCC_A2 %B 2 1 3 ! 54: CONST BCC_A2 : MG : VA : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/0364-5916(93)90006-W](https://doi.org/10.1016/0364-5916%2893%2990006-W) B. Hallstedt, Calphad, 17, 281-86(1993). _assessment that models this phase_ - [doi:10.1016/j.jeurceramsoc.2018.06.015](https://doi.org/10.1016/j.jeurceramsoc.2018.06.015) Song-Mao Liang, Rainer Schmid-Fetzer, Complete thermodynamic description of the Mg-Ca-O phase diagram including the Ca-O, Mg-O and CaO-MgO subsystems, Journal of the European Ceramic Society 38, 4768-4785 (2018). _assessment that models this phase_ - [doi:10.2298/JMMB230621034L](https://doi.org/10.2298/JMMB230621034L) X.-J. Li, S.-H. Liu, J. Mining Metall. B, 59, 395-405(2023). _assessment that models this phase_ ## FCC_A1 (Mg–O) - Id: `phase:mg-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: 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:mg-o:fcc-a1) Names (4): _corpus: _corpus:phase:mg-o:fcc-a1 _tdb: _tdb:MgO-18Lia.tdb:FCC_A1, tdb:MgO-23Li.tdb:FCC_A1, tdb:MgO-93Hal-LB.tdb:FCC_A1 ### TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written [MgO-18Lia.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-18Lia.tdb): FCC_A1, type code %A, sha256 `28bd068049e41b57…` ~~~~text 47: PHASE FCC_A1 %A 2 1 1 ! 48: CONST FCC_A1 : MG O : VA : ! ~~~~ [MgO-23Li.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-23Li.tdb): FCC_A1, type code %A, sha256 `d795b07d34aedd0d…` ~~~~text 41: PHASE FCC_A1 %A 2 1 1 ! 42: CONST FCC_A1 : MG : VA : ! ~~~~ [MgO-93Hal-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-93Hal-LB.tdb): FCC_A1, type code %A, sha256 `b656673952720e19…` ~~~~text 48: PHASE FCC_A1 %A 2 1 1 ! 49: CONST FCC_A1 : MG : VA : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/0364-5916(93)90006-W](https://doi.org/10.1016/0364-5916%2893%2990006-W) B. Hallstedt, Calphad, 17, 281-86(1993). _assessment that models this phase_ - [doi:10.1016/j.jeurceramsoc.2018.06.015](https://doi.org/10.1016/j.jeurceramsoc.2018.06.015) Song-Mao Liang, Rainer Schmid-Fetzer, Complete thermodynamic description of the Mg-Ca-O phase diagram including the Ca-O, Mg-O and CaO-MgO subsystems, Journal of the European Ceramic Society 38, 4768-4785 (2018). _assessment that models this phase_ - [doi:10.2298/JMMB230621034L](https://doi.org/10.2298/JMMB230621034L) X.-J. Li, S.-H. Liu, J. Mining Metall. B, 59, 395-405(2023). _assessment that models this phase_ ## GAS (Mg–O) - Id: `phase:mg-o:gas`; status `assigned` - Structure: gas; type `st:gas`; gas; confidence high - Stability: stable in 2 of 2 calculated diagram(s): 1372.5–2500 K, x(O) 0–1 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-o:gas) Names (4): _corpus: _corpus:phase:mg-o:gas _tdb: _tdb:MgO-18Lia.tdb:GAS, tdb:MgO-23Li.tdb:GAS, tdb:MgO-93Hal-LB.tdb:GAS ### TDB models of GAS (3): PHASE and CONSTITUENT statements as written [MgO-18Lia.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-18Lia.tdb): GAS, type code %, sha256 `28bd068049e41b57…` ~~~~text 65: PHASE GAS:G % 1 1 ! 66: CONST GAS:G : MG MG2 MGO O O2% O3 : ! ~~~~ [MgO-23Li.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-23Li.tdb): GAS, type code %, sha256 `d795b07d34aedd0d…` ~~~~text 59: PHASE GAS:G % 1 1 ! 60: CONST GAS:G : MG MG2 MGO O O2% O3 : ! ~~~~ [MgO-93Hal-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-93Hal-LB.tdb): GAS, type code %, sha256 `b656673952720e19…` ~~~~text 66: PHASE GAS:G % 1 1 ! 67: CONST GAS:G : MG MG2 MGO O O2% O3 : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/0364-5916(93)90006-W](https://doi.org/10.1016/0364-5916%2893%2990006-W) B. Hallstedt, Calphad, 17, 281-86(1993). _assessment that models this phase_ - [doi:10.1016/j.jeurceramsoc.2018.06.015](https://doi.org/10.1016/j.jeurceramsoc.2018.06.015) Song-Mao Liang, Rainer Schmid-Fetzer, Complete thermodynamic description of the Mg-Ca-O phase diagram including the Ca-O, Mg-O and CaO-MgO subsystems, Journal of the European Ceramic Society 38, 4768-4785 (2018). _assessment that models this phase_ - [doi:10.2298/JMMB230621034L](https://doi.org/10.2298/JMMB230621034L) X.-J. Li, S.-H. Liu, J. Mining Metall. B, 59, 395-405(2023). _assessment that models this phase_ ## HCP_A3 (Mg–O) - Id: `phase:mg-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: stable in 2 of 2 calculated diagram(s): 300–925 K, x(O) 0–0 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-o:hcp-a3) Names (4): _corpus: _corpus:phase:mg-o:hcp-a3 _tdb: _tdb:MgO-18Lia.tdb:HCP_A3, tdb:MgO-23Li.tdb:HCP_A3, tdb:MgO-93Hal-LB.tdb:HCP_A3 ### TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written [MgO-18Lia.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-18Lia.tdb): HCP_A3, type code %A, sha256 `28bd068049e41b57…` ~~~~text 57: PHASE HCP_A3 %A 2 1 0.5 ! 58: CONST HCP_A3 : MG% O : VA : ! ~~~~ [MgO-23Li.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-23Li.tdb): HCP_A3, type code %A, sha256 `d795b07d34aedd0d…` ~~~~text 51: PHASE HCP_A3 %A 2 1 0.5 ! 52: CONST HCP_A3 : MG : VA : ! ~~~~ [MgO-93Hal-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-93Hal-LB.tdb): HCP_A3, type code %A, sha256 `b656673952720e19…` ~~~~text 58: PHASE HCP_A3 %A 2 1 0.5 ! 59: CONST HCP_A3 : MG : VA : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/0364-5916(93)90006-W](https://doi.org/10.1016/0364-5916%2893%2990006-W) B. Hallstedt, Calphad, 17, 281-86(1993). _assessment that models this phase_ - [doi:10.1016/j.jeurceramsoc.2018.06.015](https://doi.org/10.1016/j.jeurceramsoc.2018.06.015) Song-Mao Liang, Rainer Schmid-Fetzer, Complete thermodynamic description of the Mg-Ca-O phase diagram including the Ca-O, Mg-O and CaO-MgO subsystems, Journal of the European Ceramic Society 38, 4768-4785 (2018). _assessment that models this phase_ - [doi:10.2298/JMMB230621034L](https://doi.org/10.2298/JMMB230621034L) X.-J. Li, S.-H. Liu, J. Mining Metall. B, 59, 395-405(2023). _assessment that models this phase_ ## ION (Mg–O) - Id: `phase:mg-o:ion`; status `assigned` - Structure: liquid; type `st:liquid`; liquid; confidence high - Stability: stable in 1 of 2 calculated diagram(s): 922–925 K, x(O) 0–0.0012 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-o:ion) Names (4): _corpus: _corpus:phase:mg-o:ion _tdb: _tdb:MgO-18Lia.tdb:ION, tdb:MgO-23Li.tdb:ION, tdb:MgO-93Hal-LB.tdb:ION ### TDB models of ION (3): PHASE and CONSTITUENT statements as written [MgO-18Lia.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-18Lia.tdb): ION, type code %, sha256 `28bd068049e41b57…` ~~~~text 39: PHASE ION:Y % 2 1 1 ! 40: CONST ION:Y : MG+2 : O-2 VA O : ! ~~~~ [MgO-23Li.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-23Li.tdb): ION, type code %, sha256 `d795b07d34aedd0d…` ~~~~text 33: PHASE ION:Y % 2 1 1 ! 34: CONST ION:Y : MG+2 : O-2 VA : ! ~~~~ [MgO-93Hal-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-93Hal-LB.tdb): ION, type code %, sha256 `b656673952720e19…` ~~~~text 40: PHASE ION:Y % 2 1 1 ! 41: CONST ION:Y : MG+2 : O-2 VA : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/0364-5916(93)90006-W](https://doi.org/10.1016/0364-5916%2893%2990006-W) B. Hallstedt, Calphad, 17, 281-86(1993). _assessment that models this phase_ - [doi:10.1016/j.jeurceramsoc.2018.06.015](https://doi.org/10.1016/j.jeurceramsoc.2018.06.015) Song-Mao Liang, Rainer Schmid-Fetzer, Complete thermodynamic description of the Mg-Ca-O phase diagram including the Ca-O, Mg-O and CaO-MgO subsystems, Journal of the European Ceramic Society 38, 4768-4785 (2018). _assessment that models this phase_ - [doi:10.2298/JMMB230621034L](https://doi.org/10.2298/JMMB230621034L) X.-J. Li, S.-H. Liu, J. Mining Metall. B, 59, 395-405(2023). _assessment that models this phase_ ## LIQUID (Mg–O) - Id: `phase:mg-o:liquid`; status `assigned` - Structure: liquid; type `st:liquid`; liquid; confidence high - Stability: not stable in 2 calculated diagram(s) - Literature: 27 values (27 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-o:liquid) Names (6): _corpus: _corpus:phase:mg-o:liquid _paper: _paper:10.1016/0364-5916(93)90006-w:liquid Mg, paper:10.1016/j.jeurceramsoc.2018.06.015:liquid _tdb: _tdb:MgO-18Lia.tdb:LIQUID, tdb:MgO-23Li.tdb:LIQUID, tdb:MgO-93Hal-LB.tdb:LIQUID ### TDB models of LIQUID (3): PHASE and CONSTITUENT statements as written [MgO-18Lia.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-18Lia.tdb): LIQUID, type code %, sha256 `28bd068049e41b57…` ~~~~text 42: PHASE LIQUID:L % 1 1 ! 43: CONST LIQUID:L : MG MGO O : ! ~~~~ [MgO-23Li.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-23Li.tdb): LIQUID, type code %, sha256 `d795b07d34aedd0d…` ~~~~text 36: PHASE LIQUID:L % 1 1 ! 37: CONST LIQUID:L : MG : ! ~~~~ [MgO-93Hal-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-93Hal-LB.tdb): LIQUID, type code %, sha256 `b656673952720e19…` ~~~~text 43: PHASE LIQUID:L % 1 1 ! 44: CONST LIQUID:L : MG : ! ~~~~ Example references (10 of 10; assessments first): - [doi:10.1016/j.jeurceramsoc.2018.06.015](https://doi.org/10.1016/j.jeurceramsoc.2018.06.015) Song-Mao Liang, Rainer Schmid-Fetzer, Complete thermodynamic description of the Mg-Ca-O phase diagram including the Ca-O, Mg-O and CaO-MgO subsystems, Journal of the European Ceramic Society 38, 4768-4785 (2018). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/0364-5916(93)90006-W](https://doi.org/10.1016/0364-5916%2893%2990006-W) B. Hallstedt, Calphad, 17, 281-86(1993). _assessment that models this phase; reports values for this phase_ - [doi:10.2298/JMMB230621034L](https://doi.org/10.2298/JMMB230621034L) X.-J. Li, S.-H. Liu, J. Mining Metall. B, 59, 395-405(2023). _assessment that models this phase_ - [doi:10.1351/pac198254030681](https://doi.org/10.1351/pac198254030681) J. Hlavac, Melting temperatures of refractory oxides: Part I, Pure and Applied Chemistry 54, 681-688 (1982). _cited as the source of values for this phase_ - [doi:10.1002/zaac.19130820131](https://doi.org/10.1002/zaac.19130820131) Otto Ruff, Arbeiten im Gebiet hoher Temperaturen I. Über das Schmelzen und Verdampfen unserer feuerbeständigsten Oxyde im elektrischen Vakuumofen, Z. Anorg. Chem. 82, 373-400 (1913). _cited as the source of values for this phase_ - [doi:10.1007/bf02874914](https://doi.org/10.1007/bf02874914) H. A. Wriedt, The Mg−O (Magnesium-Oxygen) system, Bulletin of Alloy Phase Diagrams 8, 227-233 (1987). _cited as the source of values for this phase_ - [doi:10.1016/0016-7037(87)90009-3](https://doi.org/10.1016/0016-7037%2887%2990009-3) Milton Blander, Arthur D. Pelton, Thermodynamic analysis of binary liquid silicates and prediction of ternary solution properties by modified quasichemical equations, Geochimica et Cosmochimica Acta 51, 85-95 (1987). _cited as the source of values for this phase_ - [doi:10.1016/0040-6031(93)80422-7](https://doi.org/10.1016/0040-6031%2893%2980422-7) A.P. Chernyshev, V.A. Petrov, V.E. Titov, A.Yu. Vorobyev, Thermal radiative properties of magnesium oxide at high temperatures, Thermochimica Acta 218, 195-209 (1993). _cited as the source of values for this phase_ - [doi:10.1016/0364-5916(89)90006-0](https://doi.org/10.1016/0364-5916%2889%2990006-0) M. Hillert, X. Wang, Thermodynamic calculation of the CaO–MgO system, Calphad 13 (1989) 267–271, http://dx.doi.org/10.1016/0364-5916(89)90006-0. _cited as the source of values for this phase_ - [doi:10.1063/1.1398069](https://doi.org/10.1063/1.1398069) Claudio Ronchi, Mikhail Sheindlin, Melting point of MgO, Journal of Applied Physics 90, 3325-3331 (2001). _cited as the source of values for this phase_ ## O2GAS (Mg–O) - Id: `phase:mg-o:o2gas`; status `assigned` - Structure: gas; type `st:gas`; gas; confidence high - Stability: stable in 2 of 2 calculated diagram(s): 300–797.5 K, x(O) 1–1 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-o:o2gas) Names (4): _corpus: _corpus:phase:mg-o:o2gas _tdb: _tdb:MgO-18Lia.tdb:O2GAS, tdb:MgO-23Li.tdb:O2GAS, tdb:MgO-93Hal-LB.tdb:O2GAS ### TDB models of O2GAS (3): PHASE and CONSTITUENT statements as written [MgO-18Lia.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-18Lia.tdb): O2GAS, type code %, sha256 `28bd068049e41b57…` ~~~~text 68: PHASE O2GAS % 1 1 ! 69: CONST O2GAS : O2 : ! ~~~~ [MgO-23Li.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-23Li.tdb): O2GAS, type code %, sha256 `d795b07d34aedd0d…` ~~~~text 62: PHASE O2GAS % 1 1 ! 63: CONST O2GAS : O2 : ! ~~~~ [MgO-93Hal-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/MgO-93Hal-LB.tdb): O2GAS, type code %, sha256 `b656673952720e19…` ~~~~text 69: PHASE O2GAS % 1 1 ! 70: CONST O2GAS : O2 : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/0364-5916(93)90006-W](https://doi.org/10.1016/0364-5916%2893%2990006-W) B. Hallstedt, Calphad, 17, 281-86(1993). _assessment that models this phase_ - [doi:10.1016/j.jeurceramsoc.2018.06.015](https://doi.org/10.1016/j.jeurceramsoc.2018.06.015) Song-Mao Liang, Rainer Schmid-Fetzer, Complete thermodynamic description of the Mg-Ca-O phase diagram including the Ca-O, Mg-O and CaO-MgO subsystems, Journal of the European Ceramic Society 38, 4768-4785 (2018). _assessment that models this phase_ - [doi:10.2298/JMMB230621034L](https://doi.org/10.2298/JMMB230621034L) X.-J. Li, S.-H. Liu, J. Mining Metall. B, 59, 395-405(2023). _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).