Mn–Ta phases

8 phases (tier A 7, 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 · Mn–Ta system page · Markdown · field reference

Phases of the Mn–Ta system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:mn-ta:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–4000 K, x(Ta) 0–1	0	2
C14_LAVES phase:mn-ta:c14-laves	MgZn2 · C14 · hP12 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2070.13 K, x(Ta) 0.30661–0.39902	0	1
CBCC_A12 phase:mn-ta:cbcc-a12	alpha-Mn · A12 · cI58 · I-43m (217)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1036.88 K, x(Ta) 0–0.01438	0	2
CUB_A13 phase:mn-ta:cub-a13	beta-Mn · A13 · cP20 · P4_132 (213)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 970.44–1382.2 K, x(Ta) 0–0.00936	0	2
FCC_A1 phase:mn-ta:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1347.37–1478.5 K, x(Ta) 0–0.01739	0	2
HCP_A3 phase:mn-ta:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
LIQUID phase:mn-ta:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 1457.71–4000 K, x(Ta) 0–1	2	2
MN2TA_C14 phase:mn-ta:mn2ta-c14	MgZn2 · C14 · hP12 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1939.38 K, x(Ta) 0.33333–0.33333	0	1

BCC_A2 (Mn–Ta)

Id: phase:mn-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 2 of 2 calculated diagram(s): 300–4000 K, x(Ta) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-ta:bcc-a2
tdb: tdb:MnTa-14Wan.tdb:BCC_A2, tdb:MnTa-21Yan.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

MnTa-14Wan.tdb: BCC_A2, type code %B, sha256 ce5846ac254fa431…

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

MnTa-21Yan.tdb: BCC_A2, type code %B, sha256 76adf07bc5bd18ca…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2021.158715 Xinlin Yan, Pavel Brož, Jan Vřešťál, Jiří Vlach, Jiří Buršík, Martina Mazalová et al., On the constitution and thermodynamic modeling of the phase diagrams Nb-Mn and Ta-Mn, Journal of Alloys and Compounds 865, 158715 (2021).
assessment that models this phase
doi:10.3139/146.111135 C. Wang, C. Zhao, Z. Lin, X. Liu, Int J. Mater. Res., 105, 1179-90(2014).
assessment that models this phase

C14_LAVES (Mn–Ta)

Id: phase:mn-ta:c14-laves; status assigned
Structure: MgZn2 · C14 · hP12 · P6_3/mmc (194); type st:c14-mgzn2-hp12; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in MnTa-21Yan.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–2070.13 K, x(Ta) 0.30661–0.39902
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:mn-ta:c14-laves
tdb: tdb:MnTa-21Yan.tdb:C14_LAVES

TDB models of C14_LAVES (1): PHASE and CONSTITUENT statements as written

MnTa-21Yan.tdb: C14_LAVES, type code %, sha256 76adf07bc5bd18ca…

53: PHASE C14_LAVES % 2 2 1 !
54: CONST C14_LAVES : MN% TA : MN TA% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2021.158715 Xinlin Yan, Pavel Brož, Jan Vřešťál, Jiří Vlach, Jiří Buršík, Martina Mazalová et al., On the constitution and thermodynamic modeling of the phase diagrams Nb-Mn and Ta-Mn, Journal of Alloys and Compounds 865, 158715 (2021).
assessment that models this phase

CBCC_A12 (Mn–Ta)

Id: phase:mn-ta:cbcc-a12; 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 2 of 2 calculated diagram(s): 300–1036.88 K, x(Ta) 0–0.01438
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-ta:cbcc-a12
tdb: tdb:MnTa-14Wan.tdb:CBCC_A12, tdb:MnTa-21Yan.tdb:CBCC_A12

TDB models of CBCC_A12 (2): PHASE and CONSTITUENT statements as written

MnTa-14Wan.tdb: CBCC_A12, type code %A, sha256 ce5846ac254fa431…

46: PHASE CBCC_A12 %A 2 1 1 !
47: CONST CBCC_A12 : MN% TA : VA : !

MnTa-21Yan.tdb: CBCC_A12, type code %A, sha256 76adf07bc5bd18ca…

43: PHASE CBCC_A12 %A 2 1 1 !
44: CONST CBCC_A12 : MN% TA : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2021.158715 Xinlin Yan, Pavel Brož, Jan Vřešťál, Jiří Vlach, Jiří Buršík, Martina Mazalová et al., On the constitution and thermodynamic modeling of the phase diagrams Nb-Mn and Ta-Mn, Journal of Alloys and Compounds 865, 158715 (2021).
assessment that models this phase
doi:10.3139/146.111135 C. Wang, C. Zhao, Z. Lin, X. Liu, Int J. Mater. Res., 105, 1179-90(2014).
assessment that models this phase

CUB_A13 (Mn–Ta)

Id: phase:mn-ta:cub-a13; status assigned
Structure: beta-Mn · A13 · cP20 · P4_132 (213); type st:a13-beta-mn-cp20; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 970.44–1382.2 K, x(Ta) 0–0.00936
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-ta:cub-a13
tdb: tdb:MnTa-14Wan.tdb:CUB_A13, tdb:MnTa-21Yan.tdb:CUB_A13

TDB models of CUB_A13 (2): PHASE and CONSTITUENT statements as written

MnTa-14Wan.tdb: CUB_A13, type code %, sha256 ce5846ac254fa431…

51: PHASE CUB_A13 % 2 1 1 !
52: CONST CUB_A13 : MN% TA : VA : !

MnTa-21Yan.tdb: CUB_A13, type code %, sha256 76adf07bc5bd18ca…

48: PHASE CUB_A13 % 2 1 1 !
49: CONST CUB_A13 : MN% TA : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2021.158715 Xinlin Yan, Pavel Brož, Jan Vřešťál, Jiří Vlach, Jiří Buršík, Martina Mazalová et al., On the constitution and thermodynamic modeling of the phase diagrams Nb-Mn and Ta-Mn, Journal of Alloys and Compounds 865, 158715 (2021).
assessment that models this phase
doi:10.3139/146.111135 C. Wang, C. Zhao, Z. Lin, X. Liu, Int J. Mater. Res., 105, 1179-90(2014).
assessment that models this phase

FCC_A1 (Mn–Ta)

Id: phase:mn-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: stable in 2 of 2 calculated diagram(s): 1347.37–1478.5 K, x(Ta) 0–0.01739
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-ta:fcc-a1
tdb: tdb:MnTa-14Wan.tdb:FCC_A1, tdb:MnTa-21Yan.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

MnTa-14Wan.tdb: FCC_A1, type code %A, sha256 ce5846ac254fa431…

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

MnTa-21Yan.tdb: FCC_A1, type code %A, sha256 76adf07bc5bd18ca…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2021.158715 Xinlin Yan, Pavel Brož, Jan Vřešťál, Jiří Vlach, Jiří Buršík, Martina Mazalová et al., On the constitution and thermodynamic modeling of the phase diagrams Nb-Mn and Ta-Mn, Journal of Alloys and Compounds 865, 158715 (2021).
assessment that models this phase
doi:10.3139/146.111135 C. Wang, C. Zhao, Z. Lin, X. Liu, Int J. Mater. Res., 105, 1179-90(2014).
assessment that models this phase

HCP_A3 (Mn–Ta)

Id: phase:mn-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 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mn-ta:hcp-a3
tdb: tdb:MnTa-14Wan.tdb:HCP_A3, tdb:MnTa-21Yan.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

MnTa-14Wan.tdb: HCP_A3, type code %A, sha256 ce5846ac254fa431…

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

MnTa-21Yan.tdb: HCP_A3, type code %A, sha256 76adf07bc5bd18ca…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2021.158715 Xinlin Yan, Pavel Brož, Jan Vřešťál, Jiří Vlach, Jiří Buršík, Martina Mazalová et al., On the constitution and thermodynamic modeling of the phase diagrams Nb-Mn and Ta-Mn, Journal of Alloys and Compounds 865, 158715 (2021).
assessment that models this phase
doi:10.3139/146.111135 C. Wang, C. Zhao, Z. Lin, X. Liu, Int J. Mater. Res., 105, 1179-90(2014).
assessment that models this phase

LIQUID (Mn–Ta)

Id: phase:mn-ta:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1457.71–4000 K, x(Ta) 0–1
Literature: 2 values (0 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:mn-ta:liquid
paper: paper:10.1016/j.jallcom.2021.158715:liquid
tdb: tdb:MnTa-14Wan.tdb:LIQUID, tdb:MnTa-21Yan.tdb:LIQUID

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

MnTa-14Wan.tdb: LIQUID, type code %, sha256 ce5846ac254fa431…

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

MnTa-21Yan.tdb: LIQUID, type code %, sha256 76adf07bc5bd18ca…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2021.158715 Xinlin Yan, Pavel Brož, Jan Vřešťál, Jiří Vlach, Jiří Buršík, Martina Mazalová et al., On the constitution and thermodynamic modeling of the phase diagrams Nb-Mn and Ta-Mn, Journal of Alloys and Compounds 865, 158715 (2021).
assessment that models this phase; reports values for this phase
doi:10.3139/146.111135 C. Wang, C. Zhao, Z. Lin, X. Liu, Int J. Mater. Res., 105, 1179-90(2014).
assessment that models this phase

MN2TA_C14 (Mn–Ta)

Id: phase:mn-ta:mn2ta-c14; status assigned
Structure: MgZn2 · C14 · hP12 · P6_3/mmc (194); type st:c14-mgzn2-hp12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaastq and oqmd-19153, space group 194
Stoichiometry: Mn 0.6667, Ta 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1939.38 K, x(Ta) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:mn-ta:mn2ta-c14
mp: mp:mp-aaaaastq
oqmd: oqmd:oqmd-19153
tdb: tdb:MnTa-14Wan.tdb:MN2TA_C14

TDB models of MN2TA_C14 (1): PHASE and CONSTITUENT statements as written

MnTa-14Wan.tdb: MN2TA_C14, type code %, sha256 ce5846ac254fa431…

56: PHASE MN2TA_C14 % 2 2 1 !
57: CONST MN2TA_C14 : MN : TA : !

Example references (1 of 1; assessments first):

doi:10.3139/146.111135 C. Wang, C. Zhao, Z. Lin, X. Liu, Int J. Mater. Res., 105, 1179-90(2014).
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}
}