# O–V phases

> O–V system: 23 phases (tier A 4, tier C 8, liquid 2, gas 1, needs_review 8); 0 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-V.html · Markdown: https://data.orchid-project.org/phases/pages/O-V.md

23 phases (tier A 4, tier C 8, liquid 2, gas 1, needs_review 8); 0 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-V) · [full JSON](https://data.orchid-project.org/phases/systems/O-V.json) · [Markdown](https://data.orchid-project.org/phases/pages/O-V.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the O–V system (23)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [HALITE_B1](#phase-o-v-b1-halite); _phase:o-v:b1-halite_ | NaCl · B1 · cF8 · Fm-3m (225) | tier A: standard phase name | no calculated diagram | 0 | 2 |
| [BCC_A2](#phase-o-v-bcc-a2); _phase:o-v:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | no calculated diagram | 0 | 2 |
| [RUTILE_C4](#phase-o-v-c4-rutile); _phase:o-v:c4-rutile_ |  | needs_review | no calculated diagram | 0 | 2 |
| [CORUNDUM_D51](#phase-o-v-d51-corundum); _phase:o-v:d51-corundum_ | alpha-Al2O3 · D5_1 · hR10 · R-3c (167) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | no calculated diagram | 0 | 2 |
| [FCC_A1](#phase-o-v-fcc-a1); _phase:o-v:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | no calculated diagram | 0 | 2 |
| [HCP_A3](#phase-o-v-hcp-a3); _phase:o-v:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | no calculated diagram | 0 | 2 |
| [ION](#phase-o-v-ion); _phase:o-v:ion_ | liquid | liquid | no calculated diagram | 0 | 2 |
| [LIQUID](#phase-o-v-liquid); _phase:o-v:liquid_ | liquid | liquid | no calculated diagram | 0 | 2 |
| [O2GAS](#phase-o-v-o2gas); _phase:o-v:o2gas_ | gas | gas | no calculated diagram | 0 | 2 |
| [V2O](#phase-o-v-v2o); _phase:o-v:v2o_ | V7O3 · mC20 · C2/m (12) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | no calculated diagram | 0 | 2 |
| [V2O5](#phase-o-v-v2o5); _phase:o-v:v2o5_ | V2O5 · oP14 · Pmmn (59) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | no calculated diagram | 0 | 2 |
| [V3O5_HT](#phase-o-v-v3o5-ht); _phase:o-v:v3o5-ht_ |  | needs_review | no calculated diagram | 0 | 2 |
| [V3O5_LT](#phase-o-v-v3o5-lt); _phase:o-v:v3o5-lt_ |  | needs_review | no calculated diagram | 0 | 2 |
| [V3O7](#phase-o-v-v3o7); _phase:o-v:v3o7_ | V3O7 · mC120 · C2/c (15) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | no calculated diagram | 0 | 2 |
| [V4O7](#phase-o-v-v4o7); _phase:o-v:v4o7_ |  | needs_review | no calculated diagram | 0 | 2 |
| [V52O64](#phase-o-v-v52o64); _phase:o-v:v52o64_ | V13O16 · tI116 · I4_1/amd (141) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | no calculated diagram | 0 | 2 |
| [V5O9](#phase-o-v-v5o9); _phase:o-v:v5o9_ | Ti5O9 · aP28 · P-1 (2) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | no calculated diagram | 0 | 2 |
| [V6O11](#phase-o-v-v6o11); _phase:o-v:v6o11_ |  | needs_review | no calculated diagram | 0 | 2 |
| [V6O13](#phase-o-v-v6o13); _phase:o-v:v6o13_ | V6O13 · mC38 · C2/m (12) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | no calculated diagram | 0 | 2 |
| [V7O13](#phase-o-v-v7o13); _phase:o-v:v7o13_ | Ti7O13 · aP40 · P-1 (2) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | no calculated diagram | 0 | 2 |
| [V8O15](#phase-o-v-v8o15); _phase:o-v:v8o15_ |  | needs_review | no calculated diagram | 0 | 2 |
| [VO_BETA](#phase-o-v-vo-beta); _phase:o-v:vo-beta_ |  | needs_review | no calculated diagram | 0 | 2 |
| [VO2_LT](#phase-o-v-vo2); _phase:o-v:vo2_ |  | needs_review | no calculated diagram | 0 | 2 |

## HALITE_B1 (O–V)

- Id: `phase:o-v:b1-halite`; status `assigned`
- Structure: NaCl · B1 · cF8 · Fm-3m (225); type `st:b1-nacl-cf8`; tier A: standard phase name; confidence high
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:b1-halite)

Names (3): _corpus: _corpus:phase:o-v:b1-halite  
_tdb: _tdb:VO-15Yan-ver1.tdb:HALITE_B1, tdb:VO-15Yan-ver2.tdb:HALITE_B1  


### TDB models of HALITE_B1 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): HALITE_B1, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
74: PHASE HALITE_B1:I % 2 1 1 !
75: CONST HALITE_B1:I : V V+2% V+3 VA : O-2% VA : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): HALITE_B1, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
74: PHASE HALITE_B1:I % 2 1 1 !
75: CONST HALITE_B1:I : V V+2% V+3 VA : O-2% VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## BCC_A2 (O–V)

- Id: `phase:o-v:bcc-a2`; status `assigned`
- Structure: W · A2 · cI2 · Im-3m (229); type `st:a2-w-ci2`; tier A: standard phase name; confidence high
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:bcc-a2)

Names (3): _corpus: _corpus:phase:o-v:bcc-a2  
_tdb: _tdb:VO-15Yan-ver1.tdb:BCC_A2, tdb:VO-15Yan-ver2.tdb:BCC_A2  


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

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): BCC_A2, type code %B, sha256 `e26d540d6bb84d67…`

~~~~text
54: PHASE BCC_A2 %B 2 1 3 !
55: CONST BCC_A2 : V : O VA% : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): BCC_A2, type code %B, sha256 `a7dd3bc52b4ee650…`

~~~~text
54: PHASE BCC_A2 %B 2 1 3 !
55: CONST BCC_A2 : V : O VA% : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## RUTILE_C4 (O–V)

- Id: `phase:o-v:c4-rutile`; status `needs_review`
- No structure assigned. Why: unrecognised_name_tokens:RUTILE
- Candidate (name_token): TiO2 · C4 · tP6 · P4_2/mnm (136) — Strukturbericht/word 'C4' in the TDB name
- Candidate (sgte_mmc2): TiO2 · C4 · tP6 · P4_2/mnm (136) — Hallstedt 2025 mmc2 row for RUTILE_C4: TiO2 (rutile)
- Candidate (sgte_mmc2): TiO2 · C4 · tP6 · P4_2/mnm (136) — Hallstedt 2025 mmc2 row for RUTILE_C4: TiO2 (rutile), VO2-ht
- Candidate (tdb_comment): TiO2 · tP6 · P4_2/mnm — VO-15Yan-ver1.tdb: 'Prototype TiO2 (tP6, P4_2/mnm)'
- Candidate (tdb_comment): TiO2 · tP6 · P4_2/mnm — VO-15Yan-ver2.tdb: 'Prototype TiO2 (tP6, P4_2/mnm)'
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:c4-rutile)

Names (3): _corpus: _corpus:phase:o-v:c4-rutile  
_tdb: _tdb:VO-15Yan-ver1.tdb:RUTILE_C4, tdb:VO-15Yan-ver2.tdb:RUTILE_C4  


### TDB models of RUTILE_C4 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): RUTILE_C4, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
129: PHASE RUTILE_C4:I % 2 1 2 !
130: CONST RUTILE_C4:I : V+4 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): RUTILE_C4, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
129: PHASE RUTILE_C4:I % 2 1 2 !
130: CONST RUTILE_C4:I : V+4 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## CORUNDUM_D51 (O–V)

- Id: `phase:o-v:d51-corundum`; status `assigned`
- Structure: alpha-Al2O3 · D5_1 · hR10 · R-3c (167); type `st:d5-1-alpha-al2o3-hr10`; 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:CORUNDUM); structure as stated in the SGTE crystallographic table for this phase name and system
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:d51-corundum)

Names (3): _corpus: _corpus:phase:o-v:d51-corundum  
_tdb: _tdb:VO-15Yan-ver1.tdb:CORUNDUM_D51, tdb:VO-15Yan-ver2.tdb:CORUNDUM_D51  


### TDB models of CORUNDUM_D51 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): CORUNDUM_D51, type code %A, sha256 `e26d540d6bb84d67…`

~~~~text
84: PHASE CORUNDUM_D51:I %A 2 2 3 !
85: CONST CORUNDUM_D51:I : V+3% V+4 VA : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): CORUNDUM_D51, type code %A, sha256 `a7dd3bc52b4ee650…`

~~~~text
84: PHASE CORUNDUM_D51:I %A 3 2 3 1 !
85: CONST CORUNDUM_D51:I : V+2 V+3% V+4 VA : O-2 : VA% O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## FCC_A1 (O–V)

- Id: `phase:o-v:fcc-a1`; status `assigned`
- Structure: Cu · A1 · cF4 · Fm-3m (225); type `st:a1-cu-cf4`; tier A: standard phase name; confidence high
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:fcc-a1)

Names (3): _corpus: _corpus:phase:o-v:fcc-a1  
_tdb: _tdb:VO-15Yan-ver1.tdb:FCC_A1, tdb:VO-15Yan-ver2.tdb:FCC_A1  


### TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): FCC_A1, type code %A, sha256 `e26d540d6bb84d67…`

~~~~text
49: PHASE FCC_A1 %A 2 1 1 !
50: CONST FCC_A1 : V : O VA% : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): FCC_A1, type code %A, sha256 `a7dd3bc52b4ee650…`

~~~~text
49: PHASE FCC_A1 %A 2 1 1 !
50: CONST FCC_A1 : V : O VA% : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## HCP_A3 (O–V)

- Id: `phase:o-v: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: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:hcp-a3)

Names (3): _corpus: _corpus:phase:o-v:hcp-a3  
_tdb: _tdb:VO-15Yan-ver1.tdb:HCP_A3, tdb:VO-15Yan-ver2.tdb:HCP_A3  


### TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): HCP_A3, type code %A, sha256 `e26d540d6bb84d67…`

~~~~text
59: PHASE HCP_A3 %A 2 1 0.5 !
60: CONST HCP_A3 : V : O VA : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): HCP_A3, type code %A, sha256 `a7dd3bc52b4ee650…`

~~~~text
59: PHASE HCP_A3 %A 2 1 0.5 !
60: CONST HCP_A3 : V : O VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## ION (O–V)

- Id: `phase:o-v:ion`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:ion)

Names (3): _corpus: _corpus:phase:o-v:ion  
_tdb: _tdb:VO-15Yan-ver1.tdb:ION, tdb:VO-15Yan-ver2.tdb:ION  


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

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): ION, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
41: PHASE ION:Y % 2 1 1 !
42: CONST ION:Y : V+2 : O-2 VA VO1.5 VO2 VO2.5 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): ION, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
41: PHASE ION:Y % 2 1 1 !
42: CONST ION:Y : V+2 : O-2 VA VO1.5 VO2 VO2.5 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## LIQUID (O–V)

- Id: `phase:o-v:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stoichiometry: V 1.0000
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:liquid)

Names (3): _corpus: _corpus:phase:o-v:liquid  
_tdb: _tdb:VO-15Yan-ver1.tdb:LIQUID, tdb:VO-15Yan-ver2.tdb:LIQUID  


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

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): LIQUID, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
44: PHASE LIQUID:L % 1 1 !
45: CONST LIQUID:L : V : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): LIQUID, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
44: PHASE LIQUID:L % 1 1 !
45: CONST LIQUID:L : V : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## O2GAS (O–V)

- Id: `phase:o-v:o2gas`; status `assigned`
- Structure: gas; type `st:gas`; gas; confidence high
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:o2gas)

Names (3): _corpus: _corpus:phase:o-v:o2gas  
_tdb: _tdb:VO-15Yan-ver1.tdb:O2GAS, tdb:VO-15Yan-ver2.tdb:O2GAS  


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

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): O2GAS, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
147: PHASE O2GAS % 1 1 !
148: CONST O2GAS : O2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): O2GAS, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
147: PHASE O2GAS % 1 1 !
148: CONST O2GAS : O2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V2O (O–V)

- Id: `phase:o-v:v2o`; status `assigned`
- Structure: V7O3 · mC20 · C2/m (12); type `st:v7o3-mc20`; 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: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v2o)

Names (3): _corpus: _corpus:phase:o-v:v2o  
_tdb: _tdb:VO-15Yan-ver1.tdb:V2O, tdb:VO-15Yan-ver2.tdb:V2O  


### TDB models of V2O (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V2O, type code %A, sha256 `e26d540d6bb84d67…`

~~~~text
69: PHASE V2O %A 2 1 0.5 !
70: CONST V2O : V : O VA : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V2O, type code %A, sha256 `a7dd3bc52b4ee650…`

~~~~text
69: PHASE V2O %A 2 1 0.5 !
70: CONST V2O : V : O VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V2O5 (O–V)

- Id: `phase:o-v:v2o5`; status `assigned`
- Structure: V2O5 · oP14 · Pmmn (59); type `st:v2o5-op14`; 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: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v2o5)

Names (3): _corpus: _corpus:phase:o-v:v2o5  
_tdb: _tdb:VO-15Yan-ver1.tdb:V2O5, tdb:VO-15Yan-ver2.tdb:V2O5  


### TDB models of V2O5 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V2O5, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
144: PHASE V2O5:I % 2 2 5 !
145: CONST V2O5:I : V+5 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V2O5, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
144: PHASE V2O5:I % 2 2 5 !
145: CONST V2O5:I : V+5 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V3O5_HT (O–V)

- Id: `phase:o-v:v3o5-ht`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model
- Candidate (sgte_mmc2): V3O5-ht · mC32 · C2/c (15) — Hallstedt 2025 mmc2 row for V3O5_HT: V3O5-ht
- Candidate (tdb_comment): V3O5-ht · mC32 · C2/c — VO-15Yan-ver1.tdb: 'Prototype V3O5-ht (mC32, C2/c)'
- Candidate (tdb_comment): V3O5-ht · mC32 · C2/c — VO-15Yan-ver2.tdb: 'Prototype V3O5-ht (mC32, C2/c)'
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v3o5-ht)

Names (3): _corpus: _corpus:phase:o-v:v3o5-ht  
_tdb: _tdb:VO-15Yan-ver1.tdb:V3O5_HT, tdb:VO-15Yan-ver2.tdb:V3O5_HT  


### TDB models of V3O5_HT (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V3O5_HT, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
94: PHASE V3O5_HT:I % 3 2 1 5 !
95: CONST V3O5_HT:I : V+3 : V+4 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V3O5_HT, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
94: PHASE V3O5_HT:I % 3 2 1 5 !
95: CONST V3O5_HT:I : V+3 : V+4 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V3O5_LT (O–V)

- Id: `phase:o-v:v3o5-lt`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model
- Candidate (sgte_mmc2): V3O5-lt · mP32 · P2/c (13) — Hallstedt 2025 mmc2 row for V3O5_LT: V3O5-lt
- Candidate (tdb_comment): V3O5-lt · mP32 · P2/c — VO-15Yan-ver1.tdb: 'Prototype V3O5-lt (mP32, P2/c)'
- Candidate (tdb_comment): V3O5-lt · mP32 · P2/c — VO-15Yan-ver2.tdb: 'Prototype V3O5-lt (mP32, P2/c)'
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v3o5-lt)

Names (3): _corpus: _corpus:phase:o-v:v3o5-lt  
_tdb: _tdb:VO-15Yan-ver1.tdb:V3O5_LT, tdb:VO-15Yan-ver2.tdb:V3O5_LT  


### TDB models of V3O5_LT (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V3O5_LT, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
89: PHASE V3O5_LT:I % 3 2 1 5 !
90: CONST V3O5_LT:I : V+3 : V+4 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V3O5_LT, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
89: PHASE V3O5_LT:I % 3 2 1 5 !
90: CONST V3O5_LT:I : V+3 : V+4 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V3O7 (O–V)

- Id: `phase:o-v:v3o7`; status `assigned`
- Structure: V3O7 · mC120 · C2/c (15); type `st:v3o7-mc120`; 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: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v3o7)

Names (3): _corpus: _corpus:phase:o-v:v3o7  
_tdb: _tdb:VO-15Yan-ver1.tdb:V3O7, tdb:VO-15Yan-ver2.tdb:V3O7  


### TDB models of V3O7 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V3O7, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
134: PHASE V3O7:I % 3 2 1 7 !
135: CONST V3O7:I : V+5 : V+4 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V3O7, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
134: PHASE V3O7:I % 3 2 1 7 !
135: CONST V3O7:I : V+5 : V+4 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V4O7 (O–V)

- Id: `phase:o-v:v4o7`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model
- Candidate (tdb_comment): Ti4O7 · aP22 · P-1 — VO-15Yan-ver1.tdb: 'Prototype Ti4O7 (aP22, P-1)'
- Candidate (tdb_comment): Ti4O7 · aP22 · P-1 — VO-15Yan-ver2.tdb: 'Prototype Ti4O7 (aP22, P-1)'
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v4o7)

Names (3): _corpus: _corpus:phase:o-v:v4o7  
_tdb: _tdb:VO-15Yan-ver1.tdb:V4O7, tdb:VO-15Yan-ver2.tdb:V4O7  


### TDB models of V4O7 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V4O7, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
99: PHASE V4O7:I % 3 2 2 7 !
100: CONST V4O7:I : V+3 : V+4 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V4O7, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
99: PHASE V4O7:I % 3 2 2 7 !
100: CONST V4O7:I : V+3 : V+4 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V52O64 (O–V)

- Id: `phase:o-v:v52o64`; status `assigned`
- Structure: V13O16 · tI116 · I4_1/amd (141); type `st:v13o16-ti116`; 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_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: O 0.5517, V 0.4483
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v52o64)

Names (3): _corpus: _corpus:phase:o-v:v52o64  
_tdb: _tdb:VO-15Yan-ver1.tdb:V52O64, tdb:VO-15Yan-ver2.tdb:V52O64  


### TDB models of V52O64 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V52O64, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
79: PHASE V52O64 % 2 52 64 !
80: CONST V52O64 : V : O : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V52O64, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
79: PHASE V52O64 % 2 52 64 !
80: CONST V52O64 : V : O : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V5O9 (O–V)

- Id: `phase:o-v:v5o9`; status `assigned`
- Structure: Ti5O9 · aP28 · P-1 (2); type `st:ti5o9-ap28`; 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: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v5o9)

Names (3): _corpus: _corpus:phase:o-v:v5o9  
_tdb: _tdb:VO-15Yan-ver1.tdb:V5O9, tdb:VO-15Yan-ver2.tdb:V5O9  


### TDB models of V5O9 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V5O9, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
104: PHASE V5O9:I % 3 2 3 9 !
105: CONST V5O9:I : V+3 : V+4 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V5O9, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
104: PHASE V5O9:I % 3 2 3 9 !
105: CONST V5O9:I : V+3 : V+4 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V6O11 (O–V)

- Id: `phase:o-v:v6o11`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model
- Candidate (tdb_comment): Ti6O11 · aP34 · P-1 — VO-15Yan-ver1.tdb: 'Prototype Ti6O11 (aP34, P-1)'
- Candidate (tdb_comment): Ti6O11 · aP34 · P-1 — VO-15Yan-ver2.tdb: 'Prototype Ti6O11 (aP34, P-1)'
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v6o11)

Names (3): _corpus: _corpus:phase:o-v:v6o11  
_tdb: _tdb:VO-15Yan-ver1.tdb:V6O11, tdb:VO-15Yan-ver2.tdb:V6O11  


### TDB models of V6O11 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V6O11, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
109: PHASE V6O11:I % 3 2 4 11 !
110: CONST V6O11:I : V+3 : V+4 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V6O11, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
109: PHASE V6O11:I % 3 2 4 11 !
110: CONST V6O11:I : V+3 : V+4 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V6O13 (O–V)

- Id: `phase:o-v:v6o13`; status `assigned`
- Structure: V6O13 · mC38 · C2/m (12); type `st:v6o13-mc38`; 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: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v6o13)

Names (3): _corpus: _corpus:phase:o-v:v6o13  
_tdb: _tdb:VO-15Yan-ver1.tdb:V6O13, tdb:VO-15Yan-ver2.tdb:V6O13  


### TDB models of V6O13 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V6O13, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
139: PHASE V6O13:I % 3 2 4 13 !
140: CONST V6O13:I : V+5 : V+4 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V6O13, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
139: PHASE V6O13:I % 3 2 4 13 !
140: CONST V6O13:I : V+5 : V+4 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V7O13 (O–V)

- Id: `phase:o-v:v7o13`; status `assigned`
- Structure: Ti7O13 · aP40 · P-1 (2); type `st:ti7o13-ap40`; 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: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v7o13)

Names (3): _corpus: _corpus:phase:o-v:v7o13  
_tdb: _tdb:VO-15Yan-ver1.tdb:V7O13, tdb:VO-15Yan-ver2.tdb:V7O13  


### TDB models of V7O13 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V7O13, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
114: PHASE V7O13:I % 3 2 5 13 !
115: CONST V7O13:I : V+3 : V+4 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V7O13, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
114: PHASE V7O13:I % 3 2 5 13 !
115: CONST V7O13:I : V+3 : V+4 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## V8O15 (O–V)

- Id: `phase:o-v:v8o15`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model
- Candidate (tdb_comment): Ti8O15 · aP46 · P-1 — VO-15Yan-ver1.tdb: 'Prototype Ti8O15 (aP46, P-1)'
- Candidate (tdb_comment): Ti8O15 · aP46 · P-1 — VO-15Yan-ver2.tdb: 'Prototype Ti8O15 (aP46, P-1)'
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:v8o15)

Names (3): _corpus: _corpus:phase:o-v:v8o15  
_tdb: _tdb:VO-15Yan-ver1.tdb:V8O15, tdb:VO-15Yan-ver2.tdb:V8O15  


### TDB models of V8O15 (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): V8O15, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
119: PHASE V8O15:I % 3 2 6 15 !
120: CONST V8O15:I : V+3 : V+4 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): V8O15, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
119: PHASE V8O15:I % 3 2 6 15 !
120: CONST V8O15:I : V+3 : V+4 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## VO_BETA (O–V)

- Id: `phase:o-v:vo-beta`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model
- Candidate (sgte_mmc2): CoO · tI4 · I4/mmm (139) — Hallstedt 2025 mmc2 row for VO_BETA: VO-beta
- Candidate (tdb_comment): CoO · tI4 · I4/mmm — VO-15Yan-ver1.tdb: 'Prototype CoO (tI4, I4/mmm)'
- Candidate (tdb_comment): CoO · tI4 · I4/mmm — VO-15Yan-ver2.tdb: 'Prototype CoO (tI4, I4/mmm)'
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:vo-beta)

Names (3): _corpus: _corpus:phase:o-v:vo-beta  
_tdb: _tdb:VO-15Yan-ver1.tdb:VO_BETA, tdb:VO-15Yan-ver2.tdb:VO_BETA  


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

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): VO_BETA, type code %A, sha256 `e26d540d6bb84d67…`

~~~~text
64: PHASE VO_BETA %A 2 1 1 !
65: CONST VO_BETA : V : O VA : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): VO_BETA, type code %A, sha256 `a7dd3bc52b4ee650…`

~~~~text
64: PHASE VO_BETA %A 2 1 1 !
65: CONST VO_BETA : V : O VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_assessment that models this phase_

## VO2_LT (O–V)

- Id: `phase:o-v:vo2`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model
- Candidate (sgte_mmc2): VO2 · mP12 · P2_1/c (14) — Hallstedt 2025 mmc2 row for VO2_LT: VO2-lt
- Candidate (tdb_comment):  — VO-15Yan-ver1.tdb: 'Prototype VO2 (mP12, P2_1/c'
- Candidate (tdb_comment):  — VO-15Yan-ver2.tdb: 'Prototype VO2 (mP12, P2_1/c'
- Stability: no calculated diagram
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:o-v:vo2)

Names (3): _corpus: _corpus:phase:o-v:vo2  
_tdb: _tdb:VO-15Yan-ver1.tdb:VO2_LT, tdb:VO-15Yan-ver2.tdb:VO2_LT  


### TDB models of VO2_LT (2): PHASE and CONSTITUENT statements as written

[VO-15Yan-ver1.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver1.tdb): VO2_LT, type code %, sha256 `e26d540d6bb84d67…`

~~~~text
124: PHASE VO2_LT:I % 2 1 2 !
125: CONST VO2_LT:I : V+4 : O-2 : !
~~~~

[VO-15Yan-ver2.tdb](https://orchid-project.org/data/databases/sgte-binary/VO-15Yan-ver2.tdb): VO2_LT, type code %, sha256 `a7dd3bc52b4ee650…`

~~~~text
124: PHASE VO2_LT:I % 2 1 2 !
125: CONST VO2_LT:I : V+4 : O-2 : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2015.08.003](https://doi.org/10.1016/j.calphad.2015.08.003) Y. Yang, H. Mao, M. Selleby, Calphad, 51, 144-60(2015).  
_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).