Re–Ta phases

8 phases (tier A 6, liquid 1, needs_review 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 · Re–Ta system page · Markdown · field reference

Phases of the Re–Ta system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
CHI_A12 phase:re-ta:a12-chi	alpha-Mn · A12 · cI58 · I-43m (217)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–3105.85 K, x(Ta) 0.16173–0.38406	23	3
BCC_A2 phase:re-ta:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–4000 K, x(Ta) 0.5331–1	18	3
SIGMA_D8B phase:re-ta:d8b-sigma	sigma-CrFe · D8_b · tP30 · P4_2/mnm (136)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 2730.25–2962.3 K, x(Ta) 0.43062–0.46934	2	2
FCC_A1 phase:re-ta:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
HCP_A3 phase:re-ta:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–3459.98 K, x(Ta) 0–0.04109	8	3
LIQUID phase:re-ta:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 2928.21–4000 K, x(Ta) 0–1	17	3
SIGMA_OLD phase:re-ta:old-sigma	sigma-CrFe · D8_b · tP30 · P4_2/mnm (136)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 2745.26–2988.83 K, x(Ta) 0.43575–0.45526	4	1
RE3TA2_D8B phase:re-ta:re3ta2-d8b		needs_review	stable in 1 of 1 calculated diagram(s): 2735.32–2969.8 K, x(Ta) 0.4–0.4	8	1

CHI_A12 (Re–Ta)

Id: phase:re-ta:a12-chi; status assigned
Structure: alpha-Mn · A12 · cI58 · I-43m (217); type st:a12-alpha-mn-ci58; tier A: standard phase name; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 300–3105.85 K, x(Ta) 0.16173–0.38406
Literature: 23 values (23 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:re-ta:a12-chi, corpus:phase:re-ta:chi-a12
paper: paper:10.1016/s0925-8388(98)01005-6:χ, paper:10.1016/s0925-8388(99)00597-6:χ
tdb: tdb:ReTa-00Liu-LB.tdb:CHI_A12, tdb:ReTa-18Guo.tdb:CHI_A12, tdb:ReTa-99Cui.tdb:CHI_A12

TDB models of CHI_A12 (3): PHASE and CONSTITUENT statements as written

ReTa-00Liu-LB.tdb: CHI_A12, type code %, sha256 a7ace7884aafa0e1…

40: PHASE CHI_A12 % 3 24 10 24 !
41: CONST CHI_A12 : RE : RE TA : RE TA : !

ReTa-18Guo.tdb: CHI_A12, type code %, sha256 e8c69b79df481f52…

43: PHASE CHI_A12 % 3 24 10 24 !
44: CONST CHI_A12 : RE : RE TA : RE TA : !

ReTa-99Cui.tdb: CHI_A12, type code %, sha256 34a1ef9fd4224280…

46: PHASE CHI_A12 % 3 24 10 24 !
47: CONST CHI_A12 : RE : TA : RE TA : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(99)00597-6 Z.-K. Liu, Y.A. Chang, J. Alloys Compd., 299, 153-62(2000).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(98)01005-6 Y. Cui, Z. Jin, J. Alloys Compd., 285, 150-55(1999).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2018.01.005 C. Guo, T. Wu, C. Li, Z. Du, Calphad, 61, 33-40(2018).
assessment that models this phase

BCC_A2 (Re–Ta)

Id: phase:re-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 3 of 3 calculated diagram(s): 300–4000 K, x(Ta) 0.5331–1
Literature: 18 values (18 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:re-ta:bcc-a2
paper: paper:10.1016/s0925-8388(98)01005-6:(Ta), paper:10.1016/s0925-8388(99)00597-6:bcc, paper:10.1016/s0925-8388(99)00597-6:σ or bcc
tdb: tdb:ReTa-00Liu-LB.tdb:BCC_A2, tdb:ReTa-18Guo.tdb:BCC_A2, tdb:ReTa-99Cui.tdb:BCC_A2

TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written

ReTa-00Liu-LB.tdb: BCC_A2, type code %B, sha256 a7ace7884aafa0e1…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : RE TA% : VA : !

ReTa-18Guo.tdb: BCC_A2, type code %B, sha256 e8c69b79df481f52…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : RE TA% : VA : !

ReTa-99Cui.tdb: BCC_A2, type code %B, sha256 34a1ef9fd4224280…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : RE TA% : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(99)00597-6 Z.-K. Liu, Y.A. Chang, J. Alloys Compd., 299, 153-62(2000).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(98)01005-6 Y. Cui, Z. Jin, J. Alloys Compd., 285, 150-55(1999).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2018.01.005 C. Guo, T. Wu, C. Li, Z. Du, Calphad, 61, 33-40(2018).
assessment that models this phase

SIGMA_D8B (Re–Ta)

Id: phase:re-ta:d8b-sigma; status assigned
Structure: sigma-CrFe · D8_b · tP30 · P4_2/mnm (136); type st:d8-b-sigma-crfe-tp30; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in ReTa-18Guo.tdb also describes the disordered state
Stability: stable in 2 of 2 calculated diagram(s): 2730.25–2962.3 K, x(Ta) 0.43062–0.46934
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:re-ta:d8b-sigma, corpus:phase:re-ta:sigma-d8b
paper: paper:10.1016/s0925-8388(99)00597-6:σ
tdb: tdb:ReTa-00Liu-LB.tdb:SIGMA_D8B, tdb:ReTa-18Guo.tdb:SIGMA_D8B

TDB models of SIGMA_D8B (2): PHASE and CONSTITUENT statements as written

ReTa-00Liu-LB.tdb: SIGMA_D8B, type code %, sha256 a7ace7884aafa0e1…

45: PHASE SIGMA_D8B % 3 10 4 16 !
46: CONST SIGMA_D8B : RE : TA : RE TA : !

ReTa-18Guo.tdb: SIGMA_D8B, type code %, sha256 e8c69b79df481f52…

48: PHASE SIGMA_D8B % 2 10 20 !
49: CONST SIGMA_D8B : RE% TA : RE TA% : !

Example references (2 of 2; assessments first):

doi:10.1016/S0925-8388(99)00597-6 Z.-K. Liu, Y.A. Chang, J. Alloys Compd., 299, 153-62(2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2018.01.005 C. Guo, T. Wu, C. Li, Z. Du, Calphad, 61, 33-40(2018).
assessment that models this phase

FCC_A1 (Re–Ta)

Id: phase:re-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 3 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:re-ta:fcc-a1
tdb: tdb:ReTa-00Liu-LB.tdb:FCC_A1, tdb:ReTa-18Guo.tdb:FCC_A1, tdb:ReTa-99Cui.tdb:FCC_A1

TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written

ReTa-00Liu-LB.tdb: FCC_A1, type code %A, sha256 a7ace7884aafa0e1…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : RE TA : VA : !

ReTa-18Guo.tdb: FCC_A1, type code %A, sha256 e8c69b79df481f52…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : RE TA : VA : !

ReTa-99Cui.tdb: FCC_A1, type code %A, sha256 34a1ef9fd4224280…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : RE TA : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2018.01.005 C. Guo, T. Wu, C. Li, Z. Du, Calphad, 61, 33-40(2018).
assessment that models this phase
doi:10.1016/S0925-8388(98)01005-6 Y. Cui, Z. Jin, J. Alloys Compd., 285, 150-55(1999).
assessment that models this phase
doi:10.1016/S0925-8388(99)00597-6 Z.-K. Liu, Y.A. Chang, J. Alloys Compd., 299, 153-62(2000).
assessment that models this phase

HCP_A3 (Re–Ta)

Id: phase:re-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: stable in 3 of 3 calculated diagram(s): 300–3459.98 K, x(Ta) 0–0.04109
Literature: 8 values (8 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:re-ta:hcp-a3
paper: paper:10.1016/s0925-8388(98)01005-6:(Re), paper:10.1016/s0925-8388(99)00597-6:hcp
tdb: tdb:ReTa-00Liu-LB.tdb:HCP_A3, tdb:ReTa-18Guo.tdb:HCP_A3, tdb:ReTa-99Cui.tdb:HCP_A3

TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written

ReTa-00Liu-LB.tdb: HCP_A3, type code %A, sha256 a7ace7884aafa0e1…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : RE% TA : VA : !

ReTa-18Guo.tdb: HCP_A3, type code %A, sha256 e8c69b79df481f52…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : RE% TA : VA : !

ReTa-99Cui.tdb: HCP_A3, type code %A, sha256 34a1ef9fd4224280…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : RE% TA : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(99)00597-6 Z.-K. Liu, Y.A. Chang, J. Alloys Compd., 299, 153-62(2000).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(98)01005-6 Y. Cui, Z. Jin, J. Alloys Compd., 285, 150-55(1999).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2018.01.005 C. Guo, T. Wu, C. Li, Z. Du, Calphad, 61, 33-40(2018).
assessment that models this phase

LIQUID (Re–Ta)

Id: phase:re-ta:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 2928.21–4000 K, x(Ta) 0–1
Literature: 17 values (17 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:re-ta:liquid
paper: paper:10.1016/s0925-8388(98)01005-6:L, paper:10.1016/s0925-8388(99)00597-6:liq
tdb: tdb:ReTa-00Liu-LB.tdb:LIQUID, tdb:ReTa-18Guo.tdb:LIQUID, tdb:ReTa-99Cui.tdb:LIQUID

TDB models of LIQUID (3): PHASE and CONSTITUENT statements as written

ReTa-00Liu-LB.tdb: LIQUID, type code %, sha256 a7ace7884aafa0e1…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : RE TA : !

ReTa-18Guo.tdb: LIQUID, type code %, sha256 e8c69b79df481f52…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : RE TA : !

ReTa-99Cui.tdb: LIQUID, type code %, sha256 34a1ef9fd4224280…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : RE TA : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(98)01005-6 Y. Cui, Z. Jin, J. Alloys Compd., 285, 150-55(1999).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(99)00597-6 Z.-K. Liu, Y.A. Chang, J. Alloys Compd., 299, 153-62(2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2018.01.005 C. Guo, T. Wu, C. Li, Z. Du, Calphad, 61, 33-40(2018).
assessment that models this phase

SIGMA_OLD (Re–Ta)

Id: phase:re-ta:old-sigma; status assigned
Structure: sigma-CrFe · D8_b · tP30 · P4_2/mnm (136); type st:d8-b-sigma-crfe-tp30; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 2745.26–2988.83 K, x(Ta) 0.43575–0.45526
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:re-ta:old-sigma, corpus:phase:re-ta:sigma-old
paper: paper:10.1016/s0925-8388(99)00597-6:σ
tdb: tdb:ReTa-00Liu-LB.tdb:SIGMA_OLD

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

ReTa-00Liu-LB.tdb: SIGMA_OLD, type code %, sha256 a7ace7884aafa0e1…

50: PHASE SIGMA_OLD % 3 8 4 18 !
51: CONST SIGMA_OLD : RE : TA : RE TA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(99)00597-6 Z.-K. Liu, Y.A. Chang, J. Alloys Compd., 299, 153-62(2000).
assessment that models this phase; reports values for this phase

RE3TA2_D8B (Re–Ta)

Id: phase:re-ta:re3ta2-d8b; status needs_review
No structure assigned. Why: stoichiometry_contradicts_D8_b:ReTa-99Cui.tdb
Candidate (name_token): sigma-CrFe · D8_b · tP30 · P4_2/mnm (136) — Strukturbericht/word 'D8B' in the TDB name
Candidate (tdb_comment): CrFe · tP30 · P4_2/mnm — ReTa-99Cui.tdb: 'Prototype CrFe (tP30, P4_2/mnm)'
Stoichiometry: Re 0.6000, Ta 0.4000
Stability: stable in 1 of 1 calculated diagram(s): 2735.32–2969.8 K, x(Ta) 0.4–0.4
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:re-ta:re3ta2-d8b
paper: paper:10.1016/s0925-8388(98)01005-6:σ
tdb: tdb:ReTa-99Cui.tdb:RE3TA2_D8B

TDB models of RE3TA2_D8B (1): PHASE and CONSTITUENT statements as written

ReTa-99Cui.tdb: RE3TA2_D8B, type code %, sha256 34a1ef9fd4224280…

51: PHASE RE3TA2_D8B % 2 3 2 !
52: CONST RE3TA2_D8B : RE : TA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(98)01005-6 Y. Cui, Z. Jin, J. Alloys Compd., 285, 150-55(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}
}