Ge–Ta phases

9 phases (tier A 7, tier C 1, liquid 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 · Ge–Ta system page · Markdown · field reference

Phases of the Ge–Ta system (9)
Phase	Structure	Basis	Stability (calculated)	TDB models
DIAMOND_A4 phase:ge-ta: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(Ta) 0–0.00161	1
BCC_A2 phase:ge-ta:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–3999.98 K, x(Ta) 0.89938–1	1
FCC_A1 phase:ge-ta:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
GE2TA_C40 phase:ge-ta:ge2ta-c40	CrSi2 · C40 · hP9 · P6_222 (180)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2220.11 K, x(Ta) 0.33333–0.33333	1
GE3TA5_D8M phase:ge-ta:ge3ta5-d8m	W5Si3 · D8_m · tI32 · I4/mcm (140)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2844.89 K, x(Ta) 0.625–0.625	1
GETA3_ALPHA phase:ge-ta:geta3-alpha	Ti3P · tP32 · P4_2/n (86)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1823.13 K, x(Ta) 0.75–0.75	1
GETA3_D0E phase:ge-ta:geta3-d0e	Ni3P · D0_e · tI32 · I-4 (82)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1823.13–2788.79 K, x(Ta) 0.75–0.75	1
HCP_A3 phase:ge-ta:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
LIQUID phase:ge-ta:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1204.63–4000 K, x(Ta) 0–1	1

DIAMOND_A4 (Ge–Ta)

Id: phase:ge-ta: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
Stability: stable in 1 of 1 calculated diagram(s): 300–1211.4 K, x(Ta) 0–0.00161
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ge-ta:a4-diamond
tdb: tdb:GeTa-24Pin.tdb:DIAMOND_A4

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

GeTa-24Pin.tdb: DIAMOND_A4, type code %, sha256 17e38d477bb8cded…

45: PHASE DIAMOND_A4 % 1 1 !
46: CONST DIAMOND_A4 : GE% TA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102669 A.A.A. Pinto da Silva, P.P. Ferreira, T.T. Dorini, G.C. Coelho, C.A. Nunes, L.T.F. Eleno, Calphad, 84, 102669(2024).
assessment that models this phase

BCC_A2 (Ge–Ta)

Id: phase:ge-ta:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–3999.98 K, x(Ta) 0.89938–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ge-ta:bcc-a2
tdb: tdb:GeTa-24Pin.tdb:BCC_A2

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

GeTa-24Pin.tdb: BCC_A2, type code %B, sha256 17e38d477bb8cded…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : GE TA% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102669 A.A.A. Pinto da Silva, P.P. Ferreira, T.T. Dorini, G.C. Coelho, C.A. Nunes, L.T.F. Eleno, Calphad, 84, 102669(2024).
assessment that models this phase

FCC_A1 (Ge–Ta)

Id: phase:ge-ta: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:ge-ta:fcc-a1
tdb: tdb:GeTa-24Pin.tdb:FCC_A1

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

GeTa-24Pin.tdb: FCC_A1, type code %A, sha256 17e38d477bb8cded…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : GE TA : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102669 A.A.A. Pinto da Silva, P.P. Ferreira, T.T. Dorini, G.C. Coelho, C.A. Nunes, L.T.F. Eleno, Calphad, 84, 102669(2024).
assessment that models this phase

GE2TA_C40 (Ge–Ta)

Id: phase:ge-ta:ge2ta-c40; status assigned
Structure: CrSi2 · C40 · hP9 · P6_222 (180); type st:c40-crsi2-hp9; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaales and oqmd-667417, space group 180
Stoichiometry: Ge 0.6667, Ta 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–2220.11 K, x(Ta) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ge-ta:ge2ta-c40
mp: mp:mp-aaaaales
oqmd: oqmd:oqmd-667417
tdb: tdb:GeTa-24Pin.tdb:GE2TA_C40

TDB models of GE2TA_C40 (1): PHASE and CONSTITUENT statements as written

GeTa-24Pin.tdb: GE2TA_C40, type code %, sha256 17e38d477bb8cded…

50: PHASE GE2TA_C40 % 2 2 1 !
51: CONST GE2TA_C40 : GE : TA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102669 A.A.A. Pinto da Silva, P.P. Ferreira, T.T. Dorini, G.C. Coelho, C.A. Nunes, L.T.F. Eleno, Calphad, 84, 102669(2024).
assessment that models this phase

GE3TA5_D8M (Ge–Ta)

Id: phase:ge-ta:ge3ta5-d8m; status assigned
Structure: W5Si3 · D8_m · tI32 · I4/mcm (140); type st:d8-m-w5si3-ti32; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaabaar and oqmd-48717, space group 140
Stoichiometry: Ge 0.3750, Ta 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 300–2844.89 K, x(Ta) 0.625–0.625
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ge-ta:ge3ta5-d8m
mp: mp:mp-aaaabaar
oqmd: oqmd:oqmd-48717
tdb: tdb:GeTa-24Pin.tdb:GE3TA5_D8M

TDB models of GE3TA5_D8M (1): PHASE and CONSTITUENT statements as written

GeTa-24Pin.tdb: GE3TA5_D8M, type code %, sha256 17e38d477bb8cded…

55: PHASE GE3TA5_D8M % 2 3 5 !
56: CONST GE3TA5_D8M : GE : TA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102669 A.A.A. Pinto da Silva, P.P. Ferreira, T.T. Dorini, G.C. Coelho, C.A. Nunes, L.T.F. Eleno, Calphad, 84, 102669(2024).
assessment that models this phase

GETA3_ALPHA (Ge–Ta)

Id: phase:ge-ta:geta3-alpha; status assigned
Structure: Ti3P · tP32 · P4_2/n (86); type st:ti3p-tp32; 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 (no_structure_token, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ge 0.2500, Ta 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–1823.13 K, x(Ta) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ge-ta:geta3-alpha
tdb: tdb:GeTa-24Pin.tdb:GETA3_ALPHA

TDB models of GETA3_ALPHA (1): PHASE and CONSTITUENT statements as written

GeTa-24Pin.tdb: GETA3_ALPHA, type code %, sha256 17e38d477bb8cded…

60: PHASE GETA3_ALPHA % 2 1 3 !
61: CONST GETA3_ALPHA : GE : TA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102669 A.A.A. Pinto da Silva, P.P. Ferreira, T.T. Dorini, G.C. Coelho, C.A. Nunes, L.T.F. Eleno, Calphad, 84, 102669(2024).
assessment that models this phase

GETA3_D0E (Ge–Ta)

Id: phase:ge-ta:geta3-d0e; status assigned
Structure: Ni3P · D0_e · tI32 · I-4 (82); type st:d0-e-ni3p-ti32; tier A: standard phase name; confidence high
Stoichiometry: Ge 0.2500, Ta 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 1823.13–2788.79 K, x(Ta) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ge-ta:geta3-d0e
tdb: tdb:GeTa-24Pin.tdb:GETA3_D0E

TDB models of GETA3_D0E (1): PHASE and CONSTITUENT statements as written

GeTa-24Pin.tdb: GETA3_D0E, type code %, sha256 17e38d477bb8cded…

65: PHASE GETA3_D0E % 2 1 3 !
66: CONST GETA3_D0E : GE : TA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102669 A.A.A. Pinto da Silva, P.P. Ferreira, T.T. Dorini, G.C. Coelho, C.A. Nunes, L.T.F. Eleno, Calphad, 84, 102669(2024).
assessment that models this phase

HCP_A3 (Ge–Ta)

Id: phase:ge-ta: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:ge-ta:hcp-a3
tdb: tdb:GeTa-24Pin.tdb:HCP_A3

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

GeTa-24Pin.tdb: HCP_A3, type code %A, sha256 17e38d477bb8cded…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : GE TA : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102669 A.A.A. Pinto da Silva, P.P. Ferreira, T.T. Dorini, G.C. Coelho, C.A. Nunes, L.T.F. Eleno, Calphad, 84, 102669(2024).
assessment that models this phase

LIQUID (Ge–Ta)

Id: phase:ge-ta:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1204.63–4000 K, x(Ta) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ge-ta:liquid
tdb: tdb:GeTa-24Pin.tdb:LIQUID

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

GeTa-24Pin.tdb: LIQUID, type code %, sha256 17e38d477bb8cded…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : GE TA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102669 A.A.A. Pinto da Silva, P.P. Ferreira, T.T. Dorini, G.C. Coelho, C.A. Nunes, L.T.F. Eleno, Calphad, 84, 102669(2024).
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}
}