Co–Te phases

8 phases (tier A 6, liquid 1, gas 1); 7 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 · Co–Te system page · Markdown · field reference

Phases of the Co–Te system (8)
Phase	Structure	Basis	Stability (calculated)	TDB models
HEXAGONAL_A8 phase:co-te:a8-hexagonal	gamma-Se · A8 · hP3 · P3_121 (152)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–722.61 K, x(Te) 1–1	1
BCC_A2 phase:co-te:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
COTE_B81 phase:co-te:cote-b81	NiAs · B8_1 · hP4 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1286.07 K, x(Te) 0.55016–0.64138	1
COTE2_C18 phase:co-te:cote2-c18	alpha-FeS2 · C18 · oP6 · Pnnm (58)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1037.11 K, x(Te) 0.66667–0.70419	1
FCC_A1 phase:co-te:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 694.99–1774.11 K, x(Te) 0–0	1
GAS phase:co-te:gas	gas	gas	stable in 1 of 1 calculated diagram(s): 1267.25–2500 K, x(Te) 0.98949–1	1
HCP_A3 phase:co-te:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1250 K, x(Te) 0–0	1
LIQUID phase:co-te:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 722.61–2500 K, x(Te) 0–1	1

HEXAGONAL_A8 (Co–Te)

Id: phase:co-te:a8-hexagonal; status assigned
Structure: gamma-Se · A8 · hP3 · P3_121 (152); type st:a8-gamma-se-hp3; tier A: standard phase name; confidence high
Stoichiometry: Te 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–722.61 K, x(Te) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-te:a8-hexagonal
tdb: tdb:CoTe-20Yua.tdb:HEXAGONAL_A8

TDB models of HEXAGONAL_A8 (1): PHASE and CONSTITUENT statements as written

CoTe-20Yua.tdb: HEXAGONAL_A8, type code %, sha256 023eef9733a28a9a…

53: PHASE HEXAGONAL_A8 % 1 1 !
54: CONST HEXAGONAL_A8 : TE : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101743 H. Yuan, J. Wang, B. Hu, R. Zhao, Y. Du, S.-Y. Zhang, Calphad, 68, 101743(2020).
assessment that models this phase

BCC_A2 (Co–Te)

Id: phase:co-te:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stoichiometry: Co 1.0000
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:co-te:bcc-a2
tdb: tdb:CoTe-20Yua.tdb:BCC_A2

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

CoTe-20Yua.tdb: BCC_A2, type code %B, sha256 023eef9733a28a9a…

41: PHASE BCC_A2 %B 2 1 3 !
42: CONST BCC_A2 : CO : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101743 H. Yuan, J. Wang, B. Hu, R. Zhao, Y. Du, S.-Y. Zhang, Calphad, 68, 101743(2020).
assessment that models this phase

COTE_B81 (Co–Te)

Id: phase:co-te:cote-b81; status assigned
Structure: NiAs · B8_1 · hP4 · P6_3/mmc (194); type st:b8-1-nias-hp4; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1286.07 K, x(Te) 0.55016–0.64138
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-te:cote-b81
tdb: tdb:CoTe-20Yua.tdb:COTE_B81

TDB models of COTE_B81 (1): PHASE and CONSTITUENT statements as written

CoTe-20Yua.tdb: COTE_B81, type code %, sha256 023eef9733a28a9a…

58: PHASE COTE_B81 % 3 1 1 1 !
59: CONST COTE_B81 : CO VA : CO VA : TE : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101743 H. Yuan, J. Wang, B. Hu, R. Zhao, Y. Du, S.-Y. Zhang, Calphad, 68, 101743(2020).
assessment that models this phase

COTE2_C18 (Co–Te)

Id: phase:co-te:cote2-c18; status assigned
Structure: alpha-FeS2 · C18 · oP6 · Pnnm (58); type st:c18-alpha-fes2-op6; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1037.11 K, x(Te) 0.66667–0.70419
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-te:cote2-c18
tdb: tdb:CoTe-20Yua.tdb:COTE2_C18

TDB models of COTE2_C18 (1): PHASE and CONSTITUENT statements as written

CoTe-20Yua.tdb: COTE2_C18, type code %, sha256 023eef9733a28a9a…

63: PHASE COTE2_C18 % 2 1 2 !
64: CONST COTE2_C18 : CO% TE : TE : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101743 H. Yuan, J. Wang, B. Hu, R. Zhao, Y. Du, S.-Y. Zhang, Calphad, 68, 101743(2020).
assessment that models this phase

FCC_A1 (Co–Te)

Id: phase:co-te:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stoichiometry: Co 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 694.99–1774.11 K, x(Te) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-te:fcc-a1
tdb: tdb:CoTe-20Yua.tdb:FCC_A1

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

CoTe-20Yua.tdb: FCC_A1, type code %A, sha256 023eef9733a28a9a…

36: PHASE FCC_A1 %A 2 1 1 !
37: CONST FCC_A1 : CO : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101743 H. Yuan, J. Wang, B. Hu, R. Zhao, Y. Du, S.-Y. Zhang, Calphad, 68, 101743(2020).
assessment that models this phase

GAS (Co–Te)

Id: phase:co-te:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1267.25–2500 K, x(Te) 0.98949–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-te:gas
tdb: tdb:CoTe-20Yua.tdb:GAS

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

CoTe-20Yua.tdb: GAS, type code %, sha256 023eef9733a28a9a…

66: PHASE GAS:G % 1 1 !
67: CONST GAS:G : CO CO2 COTE TE TE2 TE3 TE4 TE5 TE6 TE7 : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101743 H. Yuan, J. Wang, B. Hu, R. Zhao, Y. Du, S.-Y. Zhang, Calphad, 68, 101743(2020).
assessment that models this phase

HCP_A3 (Co–Te)

Id: phase:co-te:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stoichiometry: Co 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1250 K, x(Te) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-te:hcp-a3
tdb: tdb:CoTe-20Yua.tdb:HCP_A3

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

CoTe-20Yua.tdb: HCP_A3, type code %A, sha256 023eef9733a28a9a…

46: PHASE HCP_A3 %A 2 1 0.5 !
47: CONST HCP_A3 : CO : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101743 H. Yuan, J. Wang, B. Hu, R. Zhao, Y. Du, S.-Y. Zhang, Calphad, 68, 101743(2020).
assessment that models this phase

LIQUID (Co–Te)

Id: phase:co-te:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 722.61–2500 K, x(Te) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-te:liquid
tdb: tdb:CoTe-20Yua.tdb:LIQUID

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

CoTe-20Yua.tdb: LIQUID, type code %, sha256 023eef9733a28a9a…

31: PHASE LIQUID:L % 1 1 !
32: CONST LIQUID:L : CO TE : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101743 H. Yuan, J. Wang, B. Hu, R. Zhao, Y. Du, S.-Y. Zhang, Calphad, 68, 101743(2020).
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}
}