Ge–Te phases

9 phases (tier A 6, tier C 1, liquid 1, needs_review 1); 6 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 · Ge–Te system page · Markdown · field reference

Phases of the Ge–Te system (9)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
DIAMOND_A4 phase:ge-te:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1211.4 K, x(Te) 0–0	15	1
HEXAGONAL_A8 phase:ge-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	11	1
BCC_A2 phase:ge-te:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
FCC_A1 phase:ge-te:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
GETE_B1 phase:ge-te:gete-b1	NaCl · B1 · cF8 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 678.15–2500 K, x(Te) 0.50033–1	41	1
GETE_GAMMA phase:ge-te:gete-gamma		needs_review	stable in 1 of 1 calculated diagram(s): 300–638.83 K, x(Te) 0.51–0.51	8	1
GETE_LOW phase:ge-te:gete-low	alpha-GeTe · hR2 · R3m (160)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–703.15 K, x(Te) 0.5–0.50799	39	1
HCP_A3 phase:ge-te:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
LIQUID phase:ge-te:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 658.04–2500 K, x(Te) 0–1	19	1

DIAMOND_A4 (Ge–Te)

Id: phase:ge-te:a4-diamond; status assigned
Structure: C (diamond) · A4 · cF8 · Fd-3m (227); type st:a4-c-diamond-cf8; tier A: standard phase name; confidence high
Stoichiometry: Ge 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1211.4 K, x(Te) 0–0
Literature: 15 values (15 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ge-te:a4-diamond
paper: paper:10.1016/s0364-5916(99)00012-7:Ge
tdb: tdb:GeTe-99Sch-LB.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (1): PHASE and CONSTITUENT statements as written

GeTe-99Sch-LB.tdb: DIAMOND_A4, type code %, sha256 4acca1dfd153da40…

48: PHASE DIAMOND_A4 % 1 1 !
49: CONST DIAMOND_A4 : GE : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(99)00012-7 A. Schlieper, Y. Feutelais. S.G. Fries, B. Legendre, R. Blachnik, Calphad, 23, 1-18 (1999).
assessment that models this phase; reports values for this phase

HEXAGONAL_A8 (Ge–Te)

Id: phase:ge-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: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ge-te:a8-hexagonal
paper: paper:10.1016/s0364-5916(99)00012-7:Te
tdb: tdb:GeTe-99Sch-LB.tdb:HEXAGONAL_A8

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

GeTe-99Sch-LB.tdb: HEXAGONAL_A8, type code %, sha256 4acca1dfd153da40…

55: PHASE HEXAGONAL_A8 % 1 1 !
56: CONST HEXAGONAL_A8 : TE : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(99)00012-7 A. Schlieper, Y. Feutelais. S.G. Fries, B. Legendre, R. Blachnik, Calphad, 23, 1-18 (1999).
assessment that models this phase; reports values for this phase

BCC_A2 (Ge–Te)

Id: phase:ge-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: Ge 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:ge-te:bcc-a2
tdb: tdb:GeTe-99Sch-LB.tdb:BCC_A2

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

GeTe-99Sch-LB.tdb: BCC_A2, type code %, sha256 4acca1dfd153da40…

38: PHASE BCC_A2 % 2 1 3 !
39: CONST BCC_A2 : GE : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(99)00012-7 A. Schlieper, Y. Feutelais. S.G. Fries, B. Legendre, R. Blachnik, Calphad, 23, 1-18 (1999).
assessment that models this phase

FCC_A1 (Ge–Te)

Id: phase:ge-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: Ge 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:ge-te:fcc-a1
tdb: tdb:GeTe-99Sch-LB.tdb:FCC_A1

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

GeTe-99Sch-LB.tdb: FCC_A1, type code %, sha256 4acca1dfd153da40…

33: PHASE FCC_A1 % 2 1 1 !
34: CONST FCC_A1 : GE : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(99)00012-7 A. Schlieper, Y. Feutelais. S.G. Fries, B. Legendre, R. Blachnik, Calphad, 23, 1-18 (1999).
assessment that models this phase

GETE_B1 (Ge–Te)

Id: phase:ge-te:gete-b1; status assigned
Structure: NaCl · B1 · cF8 · Fm-3m (225); type st:b1-nacl-cf8; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 678.15–2500 K, x(Te) 0.50033–1
Literature: 41 values (41 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ge-te:gete-b1
paper: paper:10.1016/s0364-5916(99)00012-7:β, paper:10.1016/s0364-5916(99)00012-7:β-GeTe
tdb: tdb:GeTe-99Sch-LB.tdb:GETE_B1

TDB models of GETE_B1 (1): PHASE and CONSTITUENT statements as written

GeTe-99Sch-LB.tdb: GETE_B1, type code %, sha256 4acca1dfd153da40…

65: PHASE GETE_B1 % 2 1 1 !
66: CONST GETE_B1 : GE% VA : TE : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(99)00012-7 A. Schlieper, Y. Feutelais. S.G. Fries, B. Legendre, R. Blachnik, Calphad, 23, 1-18 (1999).
assessment that models this phase; reports values for this phase

GETE_GAMMA (Ge–Te)

Id: phase:ge-te:gete-gamma; status needs_review
No structure assigned. Why: assessment_declared_compound_differs_from_model_composition; no_on_hull_entry_in_both; no_structure_token
Candidate (sgte_mmc2): GeS · B16 · oP8 · Pnma (62) — Hallstedt 2025 mmc2 row for GETE_GAMMA: gamma-GeTe (low-T)
Candidate (tdb_comment): GeS · oP8 · Pnma — GeTe-99Sch-LB.tdb: 'Prototype GeS (oP8, Pnma)'
Stoichiometry: Ge 0.4900, Te 0.5100
Stability: stable in 1 of 1 calculated diagram(s): 300–638.83 K, x(Te) 0.51–0.51
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ge-te:gete-gamma
paper: paper:10.1016/s0364-5916(99)00012-7:γ, paper:10.1016/s0364-5916(99)00012-7:γ-GeTe
tdb: tdb:GeTe-99Sch-LB.tdb:GETE_GAMMA

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

GeTe-99Sch-LB.tdb: GETE_GAMMA, type code %, sha256 4acca1dfd153da40…

70: PHASE GETE_GAMMA % 2 49 51 !
71: CONST GETE_GAMMA : GE : TE : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(99)00012-7 A. Schlieper, Y. Feutelais. S.G. Fries, B. Legendre, R. Blachnik, Calphad, 23, 1-18 (1999).
assessment that models this phase; reports values for this phase

GETE_LOW (Ge–Te)

Id: phase:ge-te:gete-low; status assigned
Structure: alpha-GeTe · hR2 · R3m (160); type st:alpha-gete-hr2; 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 (name_has_descriptive_tokens:LOW, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 300–703.15 K, x(Te) 0.5–0.50799
Literature: 39 values (39 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ge-te:gete-low
paper: paper:10.1016/s0364-5916(99)00012-7:α, paper:10.1016/s0364-5916(99)00012-7:α-GeTe
tdb: tdb:GeTe-99Sch-LB.tdb:GETE_LOW

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

GeTe-99Sch-LB.tdb: GETE_LOW, type code %, sha256 4acca1dfd153da40…

60: PHASE GETE_LOW % 2 1 1 !
61: CONST GETE_LOW : GE% VA : TE : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(99)00012-7 A. Schlieper, Y. Feutelais. S.G. Fries, B. Legendre, R. Blachnik, Calphad, 23, 1-18 (1999).
assessment that models this phase; reports values for this phase

HCP_A3 (Ge–Te)

Id: phase:ge-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: Ge 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:ge-te:hcp-a3
tdb: tdb:GeTe-99Sch-LB.tdb:HCP_A3

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

GeTe-99Sch-LB.tdb: HCP_A3, type code %, sha256 4acca1dfd153da40…

43: PHASE HCP_A3 % 2 1 0.5 !
44: CONST HCP_A3 : GE : VA: !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(99)00012-7 A. Schlieper, Y. Feutelais. S.G. Fries, B. Legendre, R. Blachnik, Calphad, 23, 1-18 (1999).
assessment that models this phase

LIQUID (Ge–Te)

Id: phase:ge-te:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 658.04–2500 K, x(Te) 0–1
Literature: 19 values (19 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ge-te:liquid
paper: paper:10.1016/s0364-5916(99)00012-7:L
tdb: tdb:GeTe-99Sch-LB.tdb:LIQUID

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

GeTe-99Sch-LB.tdb: LIQUID, type code %, sha256 4acca1dfd153da40…

28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : GE GETE TE : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(99)00012-7 A. Schlieper, Y. Feutelais. S.G. Fries, B. Legendre, R. Blachnik, Calphad, 23, 1-18 (1999).
assessment that models this phase; reports values for 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}
}