# Al–Ta phases > Al–Ta system: 14 phases (tier A 5, tier C 2, liquid 1, needs_review 4, unresolved_no_candidates 2); 13 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references. HTML: https://data.orchid-project.org/phases/pages/AL-TA.html · Markdown: https://data.orchid-project.org/phases/pages/AL-TA.md 14 phases (tier A 5, tier C 2, liquid 1, needs_review 4, unresolved_no_candidates 2); 13 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](https://orchid-project.org/phases/?q=AL-TA) · [full JSON](https://data.orchid-project.org/phases/systems/AL-TA.json) · [Al–Ta system page](https://data.orchid-project.org/systems/AL-TA.html) · [Markdown](https://data.orchid-project.org/phases/pages/AL-TA.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the Al–Ta system (14) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [AL2TA](#phase-al-ta-al2ta); _phase:al-ta:al2ta_ | | unresolved_no_candidates | stable in 1 of 1 calculated diagram(s): 300–1867.6 K, x(Ta) 0.35–0.35 | 0 | 1 | | [AL38TA48](#phase-al-ta-al38ta48); _phase:al-ta:al38ta48_ | Al38Ta48 · mP86 · P2_1/c (14) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1900 K, x(Ta) 0.5215–0.57235 | 10 | 1 | | [AL3TA_D022](#phase-al-ta-al3ta-d022); _phase:al-ta:al3ta-d022_ | Al3Ti · D0_22 · tI8 · I4/mmm (139) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 300–1901.76 K, x(Ta) 0.24005–0.25 | 33 | 4 | | [AL3TA2](#phase-al-ta-al3ta2); _phase:al-ta:al3ta2_ | | needs_review | stable in 1 of 1 calculated diagram(s): 300–1498.65 K, x(Ta) 0.4–0.4 | 5 | 1 | | [AL3TA2_H](#phase-al-ta-al3ta2-h); _phase:al-ta:al3ta2-h_ | | needs_review | stable in 1 of 1 calculated diagram(s): 1498.13–1835.3 K, x(Ta) 0.4–0.4 | 0 | 1 | | [AL3TA2_L](#phase-al-ta-al3ta2-l); _phase:al-ta:al3ta2-l_ | | unresolved_no_candidates | stable in 1 of 1 calculated diagram(s): 300–1498.13 K, x(Ta) 0.4–0.4 | 0 | 1 | | [AL69TA39](#phase-al-ta-al69ta39); _phase:al-ta:al69ta39_ | Al69Ta39 · cF444 · F-43m (216) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 1371.45–1884.72 K, x(Ta) 0.35489–0.37818 | 23 | 2 | | [AL7TA5](#phase-al-ta-al7ta5); _phase:al-ta:al7ta5_ | | needs_review | stable in 1 of 1 calculated diagram(s): 300–1618.38 K, x(Ta) 0.41667–0.41667 | 4 | 1 | | [ALTA](#phase-al-ta-alta); _phase:al-ta:alta_ | | needs_review | stable in 2 of 2 calculated diagram(s): 300–2037.05 K, x(Ta) 0.5–0.51515 | 4 | 2 | | [BCC_A2](#phase-al-ta-bcc-a2); _phase:al-ta:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 300–3999.99 K, x(Ta) 0.87743–1 | 5 | 4 | | [SIGMA_D8B](#phase-al-ta-d8b-sigma); _phase:al-ta:d8b-sigma_ | sigma-CrFe · D8_b · tP30 · P4_2/mnm (136) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 300–2378.58 K, x(Ta) 0.50945–0.85074 | 56 | 4 | | [FCC_A1](#phase-al-ta-fcc-a1); _phase:al-ta:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 300–935.02 K, x(Ta) 0–0.00252 | 7 | 4 | | [HCP_A3](#phase-al-ta-hcp-a3); _phase:al-ta:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | not stable in 4 calculated diagram(s) | 0 | 4 | | [LIQUID](#phase-al-ta-liquid); _phase:al-ta:liquid_ | liquid | liquid | stable in 4 of 4 calculated diagram(s): 929.7–4000 K, x(Ta) 0–1 | 36 | 4 | ## AL2TA (Al–Ta) - Id: `phase:al-ta:al2ta`; status `unresolved_no_candidates` - No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token - Stoichiometry: Al 0.6500, Ta 0.3500 - Stability: stable in 1 of 1 calculated diagram(s): 300–1867.6 K, x(Ta) 0.35–0.35 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:al2ta) Names (2): _corpus: _corpus:phase:al-ta:al2ta _tdb: _tdb:AlTa-90Kat.tdb:AL2TA ### TDB models of AL2TA (1): PHASE and CONSTITUENT statements as written [AlTa-90Kat.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-90Kat.tdb): AL2TA, type code %, sha256 `a4157073c1d594d6…` ~~~~text 47: PHASE AL2TA % 2 0.35 0.65 ! 48: CONST AL2TA : TA : AL : ! ~~~~ ## AL38TA48 (Al–Ta) - Id: `phase:al-ta:al38ta48`; status `assigned` - Structure: Al38Ta48 · mP86 · P2_1/c (14); type `st:al38ta48-mp86`; 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](https://doi.org/10.1016/j.calphad.2025.102833) - Caveat: not certain from the name or DFT alone (no_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system - Stability: stable in 1 of 1 calculated diagram(s): 300–1900 K, x(Ta) 0.5215–0.57235 - Literature: 10 values (10 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:al38ta48) Names (3): _corpus: _corpus:phase:al-ta:al38ta48 _paper: _paper:10.1016/j.intermet.2009.06.015:φ _tdb: _tdb:AlTa-10Wit.tdb:AL38TA48 ### TDB models of AL38TA48 (1): PHASE and CONSTITUENT statements as written [AlTa-10Wit.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-10Wit.tdb): AL38TA48, type code %, sha256 `667ded9a7ea8878f…` ~~~~text 58: PHASE AL38TA48 % 2 38 48 ! 59: CONST AL38TA48 : AL% TA : AL TA% : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.1016/j.intermet.2009.06.015](https://doi.org/10.1016/j.intermet.2009.06.015) V.T. Witusiewicz, A.A. Bondar, U. Hecht, J. Zollinger, V.M. Petyukh, O.S. Fomichov et al., Experimental study and thermodynamic re-assessment of the binary Al–Ta system, Intermetallics 18, 92-106 (2010). _assessment that models this phase; reports values for this phase_ ## AL3TA_D022 (Al–Ta) - Id: `phase:al-ta:al3ta-d022`; status `assigned` - Structure: Al3Ti · D0_22 · tI8 · I4/mmm (139); type `st:d0-22-al3ti-ti8`; tier A: standard phase name; confidence high - Stability: stable in 4 of 4 calculated diagram(s): 300–1901.76 K, x(Ta) 0.24005–0.25 - Literature: 33 values (32 accepted) from 3 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:al3ta-d022) Names (10): _corpus: _corpus:phase:al-ta:al3ta-d022 _paper: _paper:10.1007/bf02665557:Al3Ta, paper:10.1016/j.intermet.2009.06.015:ε, paper:sha256-85fd53a1a176b694:Al3Ta\*, paper:sha256-85fd53a1a176b694:AlM-D0\*22 _system_alias: _system_alias:al-ta:epsilon _tdb: _tdb:AlTa-10Wit.tdb:AL3TA_D022, tdb:AlTa-90Kat.tdb:AL3TA_D022, tdb:AlTa-96Du-LB.tdb:AL3TA_D022, tdb:AlTa-98Sau.tdb:AL3TA_D022 ### TDB models of AL3TA_D022 (4): PHASE and CONSTITUENT statements as written [AlTa-10Wit.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-10Wit.tdb): AL3TA_D022, type code %, sha256 `667ded9a7ea8878f…` ~~~~text 48: PHASE AL3TA_D022 % 2 3 1 ! 49: CONST AL3TA_D022 : AL : AL TA% : ! ~~~~ [AlTa-90Kat.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-90Kat.tdb): AL3TA_D022, type code %, sha256 `a4157073c1d594d6…` ~~~~text 52: PHASE AL3TA_D022 % 2 0.25 0.75 ! 53: CONST AL3TA_D022 : TA : AL : ! ~~~~ [AlTa-96Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-96Du-LB.tdb): AL3TA_D022, type code %, sha256 `db1782b402270c14…` ~~~~text 67: PHASE AL3TA_D022 % 2 0.75 0.25 ! 68: CONST AL3TA_D022 : AL : TA : ! ~~~~ [AlTa-98Sau.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-98Sau.tdb): AL3TA_D022, type code %, sha256 `790811d9dcc140fc…` ~~~~text 46: PHASE AL3TA_D022 % 2 0.25 0.75 ! 47: CONST AL3TA_D022 : TA : AL : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/j.intermet.2009.06.015](https://doi.org/10.1016/j.intermet.2009.06.015) V.T. Witusiewicz, A.A. Bondar, U. Hecht, J. Zollinger, V.M. Petyukh, O.S. Fomichov et al., Experimental study and thermodynamic re-assessment of the binary Al–Ta system, Intermetallics 18, 92-106 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/BF02665557](https://doi.org/10.1007/BF02665557) Y. Du, R. Schmid-Fetzer, J. Phase Equilib., 17, 311-324(1996). _assessment that models this phase; cited as the source of values for this phase; reports values for this phase_ ## AL3TA2 (Al–Ta) - Id: `phase:al-ta:al3ta2`; status `needs_review` - No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; sgte_mmc2_row_incomplete - Candidate (literature_printed): (Al3Ta2) · aP\* ? — printed with a label mapped to this phase - Candidate (sgte_mmc2): (Al3Ta2) — Hallstedt 2025 mmc2 row for AL3TA2: Al3Ta2 - Stoichiometry: Al 0.6000, Ta 0.4000 - Stability: stable in 1 of 1 calculated diagram(s): 300–1498.65 K, x(Ta) 0.4–0.4 - Literature: 5 values (5 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:al3ta2) Names (3): _corpus: _corpus:phase:al-ta:al3ta2 _paper: _paper:10.1007/bf02665557:Al3Ta2 _tdb: _tdb:AlTa-96Du-LB.tdb:AL3TA2 ### TDB models of AL3TA2 (1): PHASE and CONSTITUENT statements as written [AlTa-96Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-96Du-LB.tdb): AL3TA2, type code %, sha256 `db1782b402270c14…` ~~~~text 47: PHASE AL3TA2 % 2 0.6 0.4 ! 48: CONST AL3TA2 : AL : TA : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.1007/BF02665557](https://doi.org/10.1007/BF02665557) Y. Du, R. Schmid-Fetzer, J. Phase Equilib., 17, 311-324(1996). _assessment that models this phase; reports values for this phase_ ## AL3TA2_H (Al–Ta) - Id: `phase:al-ta:al3ta2-h`; status `needs_review` - No structure assigned. Why: name_has_descriptive_tokens:H; no_structure_token - Candidate (tdb_comment): Al69Ta39 · cF444 · F-43m — AlTa-98Sau.tdb: 'Prototype Al69Ta39 (cF444, F-43m)' - Stoichiometry: Al 0.6000, Ta 0.4000 - Stability: stable in 1 of 1 calculated diagram(s): 1498.13–1835.3 K, x(Ta) 0.4–0.4 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:al3ta2-h) Names (2): _corpus: _corpus:phase:al-ta:al3ta2-h _tdb: _tdb:AlTa-98Sau.tdb:AL3TA2_H ### TDB models of AL3TA2_H (1): PHASE and CONSTITUENT statements as written [AlTa-98Sau.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-98Sau.tdb): AL3TA2_H, type code %, sha256 `790811d9dcc140fc…` ~~~~text 51: PHASE AL3TA2_H % 2 3 2 ! 52: CONST AL3TA2_H : AL : TA : ! ~~~~ ## AL3TA2_L (Al–Ta) - Id: `phase:al-ta:al3ta2-l`; status `unresolved_no_candidates` - No structure assigned. Why: name_has_descriptive_tokens:L; no_structure_token - Stoichiometry: Al 0.6000, Ta 0.4000 - Stability: stable in 1 of 1 calculated diagram(s): 300–1498.13 K, x(Ta) 0.4–0.4 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:al3ta2-l) Names (2): _corpus: _corpus:phase:al-ta:al3ta2-l _tdb: _tdb:AlTa-98Sau.tdb:AL3TA2_L ### TDB models of AL3TA2_L (1): PHASE and CONSTITUENT statements as written [AlTa-98Sau.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-98Sau.tdb): AL3TA2_L, type code %, sha256 `790811d9dcc140fc…` ~~~~text 56: PHASE AL3TA2_L % 2 3 2 ! 57: CONST AL3TA2_L : AL : TA : ! ~~~~ ## AL69TA39 (Al–Ta) - Id: `phase:al-ta:al69ta39`; status `assigned` - Structure: Al69Ta39 · cF444 · F-43m (216); type `st:al69ta39-cf444`; 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](https://doi.org/10.1016/j.calphad.2025.102833) - Caveat: not certain from the name or DFT alone (no_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system - Stability: stable in 2 of 2 calculated diagram(s): 1371.45–1884.72 K, x(Ta) 0.35489–0.37818 - Literature: 23 values (23 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:al69ta39) Names (5): _corpus: _corpus:phase:al-ta:al69ta39 _paper: _paper:10.1007/bf02665557:Al69Ta39, paper:10.1016/j.intermet.2009.06.015:Ta39Al69 _tdb: _tdb:AlTa-10Wit.tdb:AL69TA39, tdb:AlTa-96Du-LB.tdb:AL69TA39 ### TDB models of AL69TA39 (2): PHASE and CONSTITUENT statements as written [AlTa-10Wit.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-10Wit.tdb): AL69TA39, type code %, sha256 `667ded9a7ea8878f…` ~~~~text 53: PHASE AL69TA39 % 2 69 39 ! 54: CONST AL69TA39 : AL% TA : AL TA% : ! ~~~~ [AlTa-96Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-96Du-LB.tdb): AL69TA39, type code %, sha256 `db1782b402270c14…` ~~~~text 52: PHASE AL69TA39 % 2 0.638889 0.361111 ! 53: CONST AL69TA39 : AL : TA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/BF02665557](https://doi.org/10.1007/BF02665557) Y. Du, R. Schmid-Fetzer, J. Phase Equilib., 17, 311-324(1996). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/j.intermet.2009.06.015](https://doi.org/10.1016/j.intermet.2009.06.015) V.T. Witusiewicz, A.A. Bondar, U. Hecht, J. Zollinger, V.M. Petyukh, O.S. Fomichov et al., Experimental study and thermodynamic re-assessment of the binary Al–Ta system, Intermetallics 18, 92-106 (2010). _assessment that models this phase; reports values for this phase_ ## AL7TA5 (Al–Ta) - Id: `phase:al-ta:al7ta5`; status `needs_review` - No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete - Candidate (literature_printed): (Al7Ta5) · hP\* — printed with a label mapped to this phase - Candidate (sgte_mmc2): (Al7Ta5) — Hallstedt 2025 mmc2 row for AL7TA5: Al7Ta5 - Stoichiometry: Al 0.5833, Ta 0.4167 - Stability: stable in 1 of 1 calculated diagram(s): 300–1618.38 K, x(Ta) 0.41667–0.41667 - Literature: 4 values (4 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:al7ta5) Names (3): _corpus: _corpus:phase:al-ta:al7ta5 _paper: _paper:10.1007/bf02665557:Al7Ta5 _tdb: _tdb:AlTa-96Du-LB.tdb:AL7TA5 ### TDB models of AL7TA5 (1): PHASE and CONSTITUENT statements as written [AlTa-96Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-96Du-LB.tdb): AL7TA5, type code %, sha256 `db1782b402270c14…` ~~~~text 57: PHASE AL7TA5 % 2 0.583333 0.416667 ! 58: CONST AL7TA5 : AL : TA : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.1007/BF02665557](https://doi.org/10.1007/BF02665557) Y. Du, R. Schmid-Fetzer, J. Phase Equilib., 17, 311-324(1996). _assessment that models this phase; reports values for this phase_ ## ALTA (Al–Ta) - Id: `phase:al-ta:alta`; status `needs_review` - No structure assigned. Why: models_disagree_on_composition; no_structure_token; sgte_mmc2_row_incomplete - Candidate (literature_printed): (AlTa) · mP\* — printed with a label mapped to this phase - Candidate (sgte_mmc2): (AlTa) — Hallstedt 2025 mmc2 row for ALTA: AlTa - Stability: stable in 2 of 2 calculated diagram(s): 300–2037.05 K, x(Ta) 0.5–0.51515 - Literature: 4 values (4 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:alta) Names (4): _corpus: _corpus:phase:al-ta:alta _paper: _paper:10.1007/bf02665557:AlTa _tdb: _tdb:AlTa-90Kat.tdb:ALTA, tdb:AlTa-96Du-LB.tdb:ALTA ### TDB models of ALTA (2): PHASE and CONSTITUENT statements as written [AlTa-90Kat.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-90Kat.tdb): ALTA, type code %, sha256 `a4157073c1d594d6…` ~~~~text 57: PHASE ALTA % 2 0.51515 0.48485 ! 58: CONST ALTA : TA : AL : ! ~~~~ [AlTa-96Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-96Du-LB.tdb): ALTA, type code %, sha256 `db1782b402270c14…` ~~~~text 62: PHASE ALTA % 2 0.5 0.5 ! 63: CONST ALTA : AL : TA : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.1007/BF02665557](https://doi.org/10.1007/BF02665557) Y. Du, R. Schmid-Fetzer, J. Phase Equilib., 17, 311-324(1996). _assessment that models this phase; reports values for this phase_ ## BCC_A2 (Al–Ta) - Id: `phase:al-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 4 of 4 calculated diagram(s): 300–3999.99 K, x(Ta) 0.87743–1 - Literature: 5 values (5 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:bcc-a2) Names (7): _corpus: _corpus:phase:al-ta:bcc-a2 _paper: _paper:10.1007/bf02665557:bcc (Ta), paper:sha256-85fd53a1a176b694:bcc-A2 _tdb: _tdb:AlTa-10Wit.tdb:BCC_A2, tdb:AlTa-90Kat.tdb:BCC_A2, tdb:AlTa-96Du-LB.tdb:BCC_A2, tdb:AlTa-98Sau.tdb:BCC_A2 ### TDB models of BCC_A2 (4): PHASE and CONSTITUENT statements as written [AlTa-10Wit.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-10Wit.tdb): BCC_A2, type code %B, sha256 `667ded9a7ea8878f…` ~~~~text 38: PHASE BCC_A2 %B 2 1 3 ! 39: CONST BCC_A2 : AL TA : VA : ! ~~~~ [AlTa-90Kat.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-90Kat.tdb): BCC_A2, type code %, sha256 `a4157073c1d594d6…` ~~~~text 37: PHASE BCC_A2 % 2 1 3 ! 38: CONST BCC_A2 : AL TA% : VA : ! ~~~~ [AlTa-96Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-96Du-LB.tdb): BCC_A2, type code %, sha256 `db1782b402270c14…` ~~~~text 37: PHASE BCC_A2 % 2 1 3 ! 38: CONST BCC_A2 : AL TA : VA : ! ~~~~ [AlTa-98Sau.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-98Sau.tdb): BCC_A2, type code %, sha256 `790811d9dcc140fc…` ~~~~text 36: PHASE BCC_A2 % 2 1 3 ! 37: CONST BCC_A2 : AL TA% : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/BF02665557](https://doi.org/10.1007/BF02665557) Y. Du, R. Schmid-Fetzer, J. Phase Equilib., 17, 311-324(1996). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/j.intermet.2009.06.015](https://doi.org/10.1016/j.intermet.2009.06.015) V.T. Witusiewicz, A.A. Bondar, U. Hecht, J. Zollinger, V.M. Petyukh, O.S. Fomichov et al., Experimental study and thermodynamic re-assessment of the binary Al–Ta system, Intermetallics 18, 92-106 (2010). _assessment that models this phase_ ## SIGMA_D8B (Al–Ta) - Id: `phase:al-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 AlTa-10Wit.tdb also describes the disordered state - Caveat: partitioned order/disorder model in AlTa-90Kat.tdb also describes the disordered state - Caveat: partitioned order/disorder model in AlTa-96Du-LB.tdb also describes the disordered state - Stability: stable in 4 of 4 calculated diagram(s): 300–2378.58 K, x(Ta) 0.50945–0.85074 - Literature: 56 values (55 accepted) from 3 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:d8b-sigma) Names (10): _corpus: _corpus:phase:al-ta:d8b-sigma, corpus:phase:al-ta:sigma-d8b _paper: _paper:10.1007/bf02665557:AlTa2, paper:10.1007/bf02665557:σAlTa2, paper:10.1016/j.intermet.2009.06.015:σ, paper:sha256-85fd53a1a176b694:σ _tdb: _tdb:AlTa-10Wit.tdb:SIGMA_D8B, tdb:AlTa-90Kat.tdb:SIGMA_D8B, tdb:AlTa-96Du-LB.tdb:SIGMA_D8B, tdb:AlTa-98Sau.tdb:SIGMA_D8B ### TDB models of SIGMA_D8B (4): PHASE and CONSTITUENT statements as written [AlTa-10Wit.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-10Wit.tdb): SIGMA_D8B, type code %, sha256 `667ded9a7ea8878f…` ~~~~text 63: PHASE SIGMA_D8B % 3 10 4 16 ! 64: CONST SIGMA_D8B : AL% TA : TA : AL TA : ! ~~~~ [AlTa-90Kat.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-90Kat.tdb): SIGMA_D8B, type code %, sha256 `a4157073c1d594d6…` ~~~~text 62: PHASE SIGMA_D8B % 3 10 4 16 ! 63: CONST SIGMA_D8B : AL TA : TA : AL TA : ! ~~~~ [AlTa-96Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-96Du-LB.tdb): SIGMA_D8B, type code %, sha256 `db1782b402270c14…` ~~~~text 72: PHASE SIGMA_D8B % 3 10 4 16 ! 73: CONST SIGMA_D8B : AL% TA : TA : AL TA : ! ~~~~ [AlTa-98Sau.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-98Sau.tdb): SIGMA_D8B, type code %, sha256 `790811d9dcc140fc…` ~~~~text 61: PHASE SIGMA_D8B % 3 8 4 18 ! 62: CONST SIGMA_D8B : AL : TA : AL TA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/j.intermet.2009.06.015](https://doi.org/10.1016/j.intermet.2009.06.015) V.T. Witusiewicz, A.A. Bondar, U. Hecht, J. Zollinger, V.M. Petyukh, O.S. Fomichov et al., Experimental study and thermodynamic re-assessment of the binary Al–Ta system, Intermetallics 18, 92-106 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/BF02665557](https://doi.org/10.1007/BF02665557) Y. Du, R. Schmid-Fetzer, J. Phase Equilib., 17, 311-324(1996). _assessment that models this phase; cited as the source of values for this phase; reports values for this phase_ ## FCC_A1 (Al–Ta) - Id: `phase:al-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 4 of 4 calculated diagram(s): 300–935.02 K, x(Ta) 0–0.00252 - Literature: 7 values (7 accepted) from 3 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:fcc-a1) Names (8): _corpus: _corpus:phase:al-ta:fcc-a1 _paper: _paper:10.1007/bf02665557:fcc (Al), paper:10.1016/j.intermet.2009.06.015:(αAl), paper:sha256-85fd53a1a176b694:fcc-Al _tdb: _tdb:AlTa-10Wit.tdb:FCC_A1, tdb:AlTa-90Kat.tdb:FCC_A1, tdb:AlTa-96Du-LB.tdb:FCC_A1, tdb:AlTa-98Sau.tdb:FCC_A1 ### TDB models of FCC_A1 (4): PHASE and CONSTITUENT statements as written [AlTa-10Wit.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-10Wit.tdb): FCC_A1, type code %A, sha256 `667ded9a7ea8878f…` ~~~~text 33: PHASE FCC_A1 %A 2 1 1 ! 34: CONST FCC_A1 : AL TA : VA : ! ~~~~ [AlTa-90Kat.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-90Kat.tdb): FCC_A1, type code %, sha256 `a4157073c1d594d6…` ~~~~text 32: PHASE FCC_A1 % 2 1 1 ! 33: CONST FCC_A1 : AL% TA : VA : ! ~~~~ [AlTa-96Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-96Du-LB.tdb): FCC_A1, type code %, sha256 `db1782b402270c14…` ~~~~text 32: PHASE FCC_A1 % 2 1 1 ! 33: CONST FCC_A1 : AL TA : VA : ! ~~~~ [AlTa-98Sau.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-98Sau.tdb): FCC_A1, type code %, sha256 `790811d9dcc140fc…` ~~~~text 31: PHASE FCC_A1 % 2 1 1 ! 32: CONST FCC_A1 : AL% TA : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/j.intermet.2009.06.015](https://doi.org/10.1016/j.intermet.2009.06.015) V.T. Witusiewicz, A.A. Bondar, U. Hecht, J. Zollinger, V.M. Petyukh, O.S. Fomichov et al., Experimental study and thermodynamic re-assessment of the binary Al–Ta system, Intermetallics 18, 92-106 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/BF02665557](https://doi.org/10.1007/BF02665557) Y. Du, R. Schmid-Fetzer, J. Phase Equilib., 17, 311-324(1996). _assessment that models this phase; cited as the source of values for this phase; reports values for this phase_ ## HCP_A3 (Al–Ta) - Id: `phase:al-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 4 calculated diagram(s) - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:hcp-a3) Names (5): _corpus: _corpus:phase:al-ta:hcp-a3 _tdb: _tdb:AlTa-10Wit.tdb:HCP_A3, tdb:AlTa-90Kat.tdb:HCP_A3, tdb:AlTa-96Du-LB.tdb:HCP_A3, tdb:AlTa-98Sau.tdb:HCP_A3 ### TDB models of HCP_A3 (4): PHASE and CONSTITUENT statements as written [AlTa-10Wit.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-10Wit.tdb): HCP_A3, type code %A, sha256 `667ded9a7ea8878f…` ~~~~text 43: PHASE HCP_A3 %A 2 1 0.5 ! 44: CONST HCP_A3 : AL TA : VA : ! ~~~~ [AlTa-90Kat.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-90Kat.tdb): HCP_A3, type code %, sha256 `a4157073c1d594d6…` ~~~~text 42: PHASE HCP_A3 % 2 1 0.5 ! 43: CONST HCP_A3 : AL TA : VA : ! ~~~~ [AlTa-96Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-96Du-LB.tdb): HCP_A3, type code %, sha256 `db1782b402270c14…` ~~~~text 42: PHASE HCP_A3 % 2 1 0.5 ! 43: CONST HCP_A3 : AL TA : VA : ! ~~~~ [AlTa-98Sau.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-98Sau.tdb): HCP_A3, type code %, sha256 `790811d9dcc140fc…` ~~~~text 41: PHASE HCP_A3 % 2 1 0.5 ! 42: CONST HCP_A3 : AL TA : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/BF02665557](https://doi.org/10.1007/BF02665557) Y. Du, R. Schmid-Fetzer, J. Phase Equilib., 17, 311-324(1996). _assessment that models this phase_ - [doi:10.1016/j.intermet.2009.06.015](https://doi.org/10.1016/j.intermet.2009.06.015) V.T. Witusiewicz, A.A. Bondar, U. Hecht, J. Zollinger, V.M. Petyukh, O.S. Fomichov et al., Experimental study and thermodynamic re-assessment of the binary Al–Ta system, Intermetallics 18, 92-106 (2010). _assessment that models this phase_ ## LIQUID (Al–Ta) - Id: `phase:al-ta:liquid`; status `assigned` - Structure: liquid; type `st:liquid`; liquid; confidence high - Stability: stable in 4 of 4 calculated diagram(s): 929.7–4000 K, x(Ta) 0–1 - Literature: 36 values (36 accepted) from 3 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:al-ta:liquid) Names (9): _corpus: _corpus:phase:al-ta:liquid _paper: _paper:10.1007/bf02665557:Liquid, paper:10.1007/bf02665557:liquid, paper:10.1016/j.intermet.2009.06.015:L, paper:sha256-85fd53a1a176b694:Liquid _tdb: _tdb:AlTa-10Wit.tdb:LIQUID, tdb:AlTa-90Kat.tdb:LIQUID, tdb:AlTa-96Du-LB.tdb:LIQUID, tdb:AlTa-98Sau.tdb:LIQUID ### TDB models of LIQUID (4): PHASE and CONSTITUENT statements as written [AlTa-10Wit.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-10Wit.tdb): LIQUID, type code %, sha256 `667ded9a7ea8878f…` ~~~~text 28: PHASE LIQUID:L % 1 1 ! 29: CONST LIQUID:L : AL TA : ! ~~~~ [AlTa-90Kat.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-90Kat.tdb): LIQUID, type code %, sha256 `a4157073c1d594d6…` ~~~~text 27: PHASE LIQUID:L % 1 1 ! 28: CONST LIQUID:L : AL TA : ! ~~~~ [AlTa-96Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-96Du-LB.tdb): LIQUID, type code %, sha256 `db1782b402270c14…` ~~~~text 27: PHASE LIQUID:L % 1 1 ! 28: CONST LIQUID:L : AL TA : ! ~~~~ [AlTa-98Sau.tdb](https://orchid-project.org/data/databases/sgte-binary/AlTa-98Sau.tdb): LIQUID, type code %, sha256 `790811d9dcc140fc…` ~~~~text 26: PHASE LIQUID:L % 1 1 ! 27: CONST LIQUID:L : AL TA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/BF02665557](https://doi.org/10.1007/BF02665557) Y. Du, R. Schmid-Fetzer, J. Phase Equilib., 17, 311-324(1996). _assessment that models this phase; cited as the source of values for this phase; reports values for this phase_ - [doi:10.1016/j.intermet.2009.06.015](https://doi.org/10.1016/j.intermet.2009.06.015) V.T. Witusiewicz, A.A. Bondar, U. Hecht, J. Zollinger, V.M. Petyukh, O.S. Fomichov et al., Experimental study and thermodynamic re-assessment of the binary Al–Ta system, Intermetallics 18, 92-106 (2010). _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). https://doi.org/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). https://doi.org/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. ```bibtex @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} } ``` --- Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite the ORCHID phase registry and the sources named on the page (TDB assessments, Hallstedt 2025, Materials Project, OQMD). TDB statements are quoted as written; parameter expressions are not reproduced. Field reference: [SCHEMA.md](https://data.orchid-project.org/phases/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt).