As–Te phases

8 phases (tier A 5, tier C 1, liquid 1, gas 1); 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 · As–Te system page · Markdown · field reference

Phases of the As–Te system (8)
Phase	Structure	Basis	Stability (calculated)	TDB models
RHOMBOHEDRAL_A7 phase:as-te:a7-rhombohedral	alpha-As · A7 · hR2 · R-3m (166)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–888.37 K, x(Te) 0–0	1
HEXAGONAL_A8 phase:as-te:a8-hexagonal	gamma-Se · A8 · hP3 · P3_121 (152)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–722.66 K, x(Te) 1–1	1
AS2TE3 phase:as-te:as2te3	As2Te3 · mC20 · C2/m (12)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–652.75 K, x(Te) 0.6–0.6	1
BCC_A2 phase:as-te:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
FCC_A1 phase:as-te:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
GAS phase:as-te:gas	gas	gas	stable in 1 of 1 calculated diagram(s): 888.37–2500 K, x(Te) 0–1	1
HCP_A3 phase:as-te:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
LIQUID phase:as-te:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 632.66–1310 K, x(Te) 0.37009–1	1

RHOMBOHEDRAL_A7 (As–Te)

Id: phase:as-te:a7-rhombohedral; status assigned
Structure: alpha-As · A7 · hR2 · R-3m (166); type st:a7-alpha-as-hr2; tier A: standard phase name; confidence high
Stoichiometry: As 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–888.37 K, x(Te) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:as-te:a7-rhombohedral
tdb: tdb:AsTe-20Yua.tdb:RHOMBOHEDRAL_A7

TDB models of RHOMBOHEDRAL_A7 (1): PHASE and CONSTITUENT statements as written

AsTe-20Yua.tdb: RHOMBOHEDRAL_A7, type code %, sha256 95641bd1ffe25475…

55: PHASE RHOMBOHEDRAL_A7 % 1 1 !
56: CONST RHOMBOHEDRAL_A7 : AS : !

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

HEXAGONAL_A8 (As–Te)

Id: phase:as-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): 300–722.66 K, x(Te) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

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

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

AsTe-20Yua.tdb: HEXAGONAL_A8, type code %, sha256 95641bd1ffe25475…

62: PHASE HEXAGONAL_A8 % 1 1 !
63: 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

AS2TE3 (As–Te)

Id: phase:as-te:as2te3; status assigned
Structure: As2Te3 · mC20 · C2/m (12); type st:as2te3-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
Caveat: not certain from the name or DFT alone (dft_space_group_12_matches_3_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: As 0.4000, Te 0.6000
Stability: stable in 1 of 1 calculated diagram(s): 300–652.75 K, x(Te) 0.6–0.6
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:as-te:as2te3
tdb: tdb:AsTe-20Yua.tdb:AS2TE3

TDB models of AS2TE3 (1): PHASE and CONSTITUENT statements as written

AsTe-20Yua.tdb: AS2TE3, type code %, sha256 95641bd1ffe25475…

67: PHASE AS2TE3 % 2 2 3 !
68: CONST AS2TE3 : AS : 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 (As–Te)

Id: phase:as-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: As 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:as-te:bcc-a2
tdb: tdb:AsTe-20Yua.tdb:BCC_A2

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

AsTe-20Yua.tdb: BCC_A2, type code %B, sha256 95641bd1ffe25475…

45: PHASE BCC_A2 %B 2 1 3 !
46: CONST BCC_A2 : AS : 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

FCC_A1 (As–Te)

Id: phase:as-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: As 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:as-te:fcc-a1
tdb: tdb:AsTe-20Yua.tdb:FCC_A1

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

AsTe-20Yua.tdb: FCC_A1, type code %A, sha256 95641bd1ffe25475…

40: PHASE FCC_A1 %A 2 1 1 !
41: CONST FCC_A1 : AS : 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 (As–Te)

Id: phase:as-te:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 888.37–2500 K, x(Te) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:as-te:gas
tdb: tdb:AsTe-20Yua.tdb:GAS

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

AsTe-20Yua.tdb: GAS, type code %, sha256 95641bd1ffe25475…

70: PHASE GAS:G % 1 1 !
71: CONST GAS:G : AS AS2 AS4 ASTE 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 (As–Te)

Id: phase:as-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: As 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:as-te:hcp-a3
tdb: tdb:AsTe-20Yua.tdb:HCP_A3

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

AsTe-20Yua.tdb: HCP_A3, type code %A, sha256 95641bd1ffe25475…

50: PHASE HCP_A3 %A 2 1 0.5 !
51: CONST HCP_A3 : AS : 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 (As–Te)

Id: phase:as-te:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 632.66–1310 K, x(Te) 0.37009–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:as-te:liquid
tdb: tdb:AsTe-20Yua.tdb:LIQUID

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

AsTe-20Yua.tdb: LIQUID, type code %, sha256 95641bd1ffe25475…

35: PHASE LIQUID:L % 1 1 !
36: CONST LIQUID:L : AS 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}
}