In–O phases

8 phases (tier A 5, liquid 1, 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 · full JSON · In–O system page · Markdown · field reference

Phases of the In–O system (8)
Phase	Structure	Basis	Stability (calculated)	TDB models
TETRAGONAL_A6 phase:in-o:a6-tetragonal	In · A6 · tI2 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–303 K, x(O) 0–0	1
BCC_A2 phase:in-o:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
FCC_A1 phase:in-o:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
GAS phase:in-o:gas	gas	gas	stable in 1 of 1 calculated diagram(s): 1658.66–2293.05 K, x(O) 0.0002–0.33238	1
HCP_A3 phase:in-o:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
IN2O3_D53 phase:in-o:in2o3-d53	Mn2O3 · D5_3 · cI80 · Ia-3 (206)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–715 K, x(O) 0.6–0.6	1
ION phase:in-o:ion	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1658.66–2293.05 K, x(O) 0–0.0761	1
O2GAS phase:in-o:o2gas	gas	gas	stable in 1 of 1 calculated diagram(s): 300–715 K, x(O) 1–1	1

TETRAGONAL_A6 (In–O)

Id: phase:in-o:a6-tetragonal; status assigned
Structure: In · A6 · tI2 · I4/mmm (139); type st:a6-in-ti2; tier A: standard phase name; confidence high
Stoichiometry: In 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–303 K, x(O) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:in-o:a6-tetragonal
tdb: tdb:InO-06Iso.tdb:TETRAGONAL_A6

TDB models of TETRAGONAL_A6 (1): PHASE and CONSTITUENT statements as written

InO-06Iso.tdb: TETRAGONAL_A6, type code %, sha256 0a94a17909d2d28d…

59: PHASE TETRAGONAL_A6 % 1 1 !
60: CONST TETRAGONAL_A6 : IN : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.083 I. Isomaeki, M. Haemaelaeinen, W. Gierlotka, B. Onderka, K. Fitzner, J. Alloys Compd., 422, 173-77(2006).
assessment that models this phase

BCC_A2 (In–O)

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

Names (2): corpus: corpus:phase:in-o:bcc-a2
tdb: tdb:InO-06Iso.tdb:BCC_A2

TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written

InO-06Iso.tdb: BCC_A2, type code %B, sha256 0a94a17909d2d28d…

49: PHASE BCC_A2 %B 2 1 3 !
50: CONST BCC_A2 : IN : O VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.083 I. Isomaeki, M. Haemaelaeinen, W. Gierlotka, B. Onderka, K. Fitzner, J. Alloys Compd., 422, 173-77(2006).
assessment that models this phase

FCC_A1 (In–O)

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

Names (2): corpus: corpus:phase:in-o:fcc-a1
tdb: tdb:InO-06Iso.tdb:FCC_A1

TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written

InO-06Iso.tdb: FCC_A1, type code %A, sha256 0a94a17909d2d28d…

44: PHASE FCC_A1 %A 2 1 1 !
45: CONST FCC_A1 : IN : O VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.083 I. Isomaeki, M. Haemaelaeinen, W. Gierlotka, B. Onderka, K. Fitzner, J. Alloys Compd., 422, 173-77(2006).
assessment that models this phase

GAS (In–O)

Id: phase:in-o:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1658.66–2293.05 K, x(O) 0.0002–0.33238
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:in-o:gas
tdb: tdb:InO-06Iso.tdb:GAS

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

InO-06Iso.tdb: GAS, type code %, sha256 0a94a17909d2d28d…

67: PHASE GAS:G % 1 1 !
68: CONST GAS:G : IN IN2 INO IN2O O O2% O3 : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.083 I. Isomaeki, M. Haemaelaeinen, W. Gierlotka, B. Onderka, K. Fitzner, J. Alloys Compd., 422, 173-77(2006).
assessment that models this phase

HCP_A3 (In–O)

Id: phase:in-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: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:in-o:hcp-a3
tdb: tdb:InO-06Iso.tdb:HCP_A3

TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written

InO-06Iso.tdb: HCP_A3, type code %A, sha256 0a94a17909d2d28d…

54: PHASE HCP_A3 %A 2 1 0.5 !
55: CONST HCP_A3 : IN : O VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.083 I. Isomaeki, M. Haemaelaeinen, W. Gierlotka, B. Onderka, K. Fitzner, J. Alloys Compd., 422, 173-77(2006).
assessment that models this phase

IN2O3_D53 (In–O)

Id: phase:in-o:in2o3-d53; status assigned
Structure: Mn2O3 · D5_3 · cI80 · Ia-3 (206); type st:d5-3-mn2o3-ci80; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–715 K, x(O) 0.6–0.6
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:in-o:in2o3-d53
tdb: tdb:InO-06Iso.tdb:IN2O3_D53

TDB models of IN2O3_D53 (1): PHASE and CONSTITUENT statements as written

InO-06Iso.tdb: IN2O3_D53, type code %, sha256 0a94a17909d2d28d…

64: PHASE IN2O3_D53:I % 2 2 3 !
65: CONST IN2O3_D53:I : IN+3 : O-2 : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.083 I. Isomaeki, M. Haemaelaeinen, W. Gierlotka, B. Onderka, K. Fitzner, J. Alloys Compd., 422, 173-77(2006).
assessment that models this phase

ION (In–O)

Id: phase:in-o:ion; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1658.66–2293.05 K, x(O) 0–0.0761
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:in-o:ion
tdb: tdb:InO-06Iso.tdb:ION

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

InO-06Iso.tdb: ION, type code %, sha256 0a94a17909d2d28d…

39: PHASE ION:Y % 2 1 1 !
40: CONST ION:Y : IN+3 : O-2 VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.083 I. Isomaeki, M. Haemaelaeinen, W. Gierlotka, B. Onderka, K. Fitzner, J. Alloys Compd., 422, 173-77(2006).
assessment that models this phase

O2GAS (In–O)

Id: phase:in-o:o2gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–715 K, x(O) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:in-o:o2gas
tdb: tdb:InO-06Iso.tdb:O2GAS

TDB models of O2GAS (1): PHASE and CONSTITUENT statements as written

InO-06Iso.tdb: O2GAS, type code %, sha256 0a94a17909d2d28d…

70: PHASE O2GAS % 1 1 !
71: CONST O2GAS : O2 : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.083 I. Isomaeki, M. Haemaelaeinen, W. Gierlotka, B. Onderka, K. Fitzner, J. Alloys Compd., 422, 173-77(2006).
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}
}