F–O phases
2 phases (gas 2); 1 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 · F–O system page · Markdown · field reference
Phases of the F–O system (2)
Phase Structure Basis Stability (calculated) Literature values TDB models
GAS phase:f-o:gas gas gas stable in 1 of 1 calculated diagram(s): 300–2500 K, x(O) 0–1 0 1 O2GAS phase:f-o:o2gas gas gas not stable in 1 calculated diagram(s) 0 1
GAS (F–O)
Id: phase:f-o:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2500 K, x(O) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry
Names (2): corpus: corpus:phase:f-o:gastdb: tdb:FO-97SUB.tdb:GAS
TDB models of GAS (1): PHASE and CONSTITUENT statements as written
FO-97SUB.tdb : GAS, type code %, sha256 62071db1ae5318a6…
31: PHASE GAS:G % 1 1 !
32: CONST GAS:G : F F2 FO FO2 F2O F2O2 O O2% O3 : !
O2GAS (F–O)
Id: phase:f-o:o2gas; status assigned
Structure: gas; type st:gas; gas; confidence high
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:f-o:o2gastdb: tdb:FO-97SUB.tdb:O2GAS
TDB models of O2GAS (1): PHASE and CONSTITUENT statements as written
FO-97SUB.tdb : O2GAS, type code %, sha256 62071db1ae5318a6…
34: PHASE O2GAS % 1 1 !
35: CONST O2GAS : O2 : !
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}
}