B–Tm phases

8 phases (tier A 4, tier C 1, liquid 1, needs_review 2); 8 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 · Markdown · field reference

Phases of the B–Tm system (8)
Phase	Structure	Basis	Stability (calculated)	TDB models
ALPHA_RHOMBO_B phase:b-tm:b-alpha-rhombo		needs_review	stable in 1 of 1 calculated diagram(s): 300–1388 K, x(B) 1–1	1
BETA_RHOMBO_B phase:b-tm:b-beta-rhombo		needs_review	stable in 1 of 1 calculated diagram(s): 1388–2348.09 K, x(B) 1–1	1
HCP_A3 phase:b-tm:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–3999.25 K, x(B) 0–0	1
LIQUID phase:b-tm:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1772.81–4000 K, x(B) 0–1	1
TMB12_D2F phase:b-tm:tmb12-d2f	UB12 · D2_f · cF52 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2452.91 K, x(B) 0.92308–0.92308	1
TMB2_C32 phase:b-tm:tmb2-c32	AlB2 · C32 · hP3 · P6/mmm (191)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2523.01 K, x(B) 0.66667–0.66667	1
TMB4_D1E phase:b-tm:tmb4-d1e	UB4 · D1_e · tP20 · P4/mbm (127)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2822.91 K, x(B) 0.8–0.8	1
TMB66 phase:b-tm:tmb66	YB66 · cF1936 · Fm-3c (226)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2372.29 K, x(B) 0.98507–0.98507	1

ALPHA_RHOMBO_B (B–Tm)

Id: phase:b-tm:b-alpha-rhombo; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:RHOMBO; no_structure_token
Candidate (sgte_mmc2): alpha-B · hR12 · R-3m (166) — Hallstedt 2025 mmc2 row for ALPHA_RHOMBO_B: Si_nB
Candidate (tdb_comment): alpha-B · hR12 · R-3m — TmB-20Wei.tdb: 'Prototype alpha-B (hR12, R-3m)'
Stoichiometry: B 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1388 K, x(B) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-tm:b-alpha-rhombo
tdb: tdb:TmB-20Wei.tdb:ALPHA_RHOMBO_B

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

TmB-20Wei.tdb: ALPHA_RHOMBO_B, type code %, sha256 f19af3c790bdfb4c…

30: PHASE ALPHA_RHOMBO_B % 1 1 !
31: CONST ALPHA_RHOMBO_B : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

BETA_RHOMBO_B (B–Tm)

Id: phase:b-tm:b-beta-rhombo; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:RHOMBO; no_structure_token
Candidate (sgte_mmc2): beta-B · hR105 · R-3m (166) — Hallstedt 2025 mmc2 row for BETA_RHOMBO_B: beta-B
Candidate (tdb_comment): beta-B · hR105 · R-3m — TmB-20Wei.tdb: 'Prototype beta-B (hR105, R-3m)'
Stoichiometry: B 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 1388–2348.09 K, x(B) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-tm:b-beta-rhombo
tdb: tdb:TmB-20Wei.tdb:BETA_RHOMBO_B

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

TmB-20Wei.tdb: BETA_RHOMBO_B, type code %, sha256 f19af3c790bdfb4c…

35: PHASE BETA_RHOMBO_B % 1 1 !
36: CONST BETA_RHOMBO_B : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

HCP_A3 (B–Tm)

Id: phase:b-tm: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: Tm 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–3999.25 K, x(B) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-tm:hcp-a3
tdb: tdb:TmB-20Wei.tdb:HCP_A3

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

TmB-20Wei.tdb: HCP_A3, type code %A, sha256 f19af3c790bdfb4c…

25: PHASE HCP_A3 %A 2 1 0.5 !
26: CONST HCP_A3 : TM : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

LIQUID (B–Tm)

Id: phase:b-tm:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1772.81–4000 K, x(B) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-tm:liquid
tdb: tdb:TmB-20Wei.tdb:LIQUID

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

TmB-20Wei.tdb: LIQUID, type code %, sha256 f19af3c790bdfb4c…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : B TM : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

TMB12_D2F (B–Tm)

Id: phase:b-tm:tmb12-d2f; status assigned
Structure: UB12 · D2_f · cF52 · Fm-3m (225); type st:d2-f-ub12-cf52; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaackwmj and oqmd-28623, space group 225
Stoichiometry: B 0.9231, Tm 0.0769
Stability: stable in 1 of 1 calculated diagram(s): 300–2452.91 K, x(B) 0.92308–0.92308
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:b-tm:tmb12-d2f
mp: mp:mp-aaackwmj
oqmd: oqmd:oqmd-28623
tdb: tdb:TmB-20Wei.tdb:TMB12_D2F

TDB models of TMB12_D2F (1): PHASE and CONSTITUENT statements as written

TmB-20Wei.tdb: TMB12_D2F, type code %, sha256 f19af3c790bdfb4c…

50: PHASE TMB12_D2F % 2 1 12 !
51: CONST TMB12_D2F : TM : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

TMB2_C32 (B–Tm)

Id: phase:b-tm:tmb2-c32; status assigned
Structure: AlB2 · C32 · hP3 · P6/mmm (191); type st:c32-alb2-hp3; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaabeu and oqmd-8473, space group 191
Stoichiometry: B 0.6667, Tm 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–2523.01 K, x(B) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:b-tm:tmb2-c32
mp: mp:mp-aaaaabeu
oqmd: oqmd:oqmd-8473
tdb: tdb:TmB-20Wei.tdb:TMB2_C32

TDB models of TMB2_C32 (1): PHASE and CONSTITUENT statements as written

TmB-20Wei.tdb: TMB2_C32, type code %, sha256 f19af3c790bdfb4c…

40: PHASE TMB2_C32 % 2 1 2 !
41: CONST TMB2_C32 : TM : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

TMB4_D1E (B–Tm)

Id: phase:b-tm:tmb4-d1e; status assigned
Structure: UB4 · D1_e · tP20 · P4/mbm (127); type st:d1-e-ub4-tp20; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaabgilr and oqmd-19072, space group 127
Stoichiometry: B 0.8000, Tm 0.2000
Stability: stable in 1 of 1 calculated diagram(s): 300–2822.91 K, x(B) 0.8–0.8
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:b-tm:tmb4-d1e
mp: mp:mp-aaabgilr
oqmd: oqmd:oqmd-19072
tdb: tdb:TmB-20Wei.tdb:TMB4_D1E

TDB models of TMB4_D1E (1): PHASE and CONSTITUENT statements as written

TmB-20Wei.tdb: TMB4_D1E, type code %, sha256 f19af3c790bdfb4c…

45: PHASE TMB4_D1E % 2 1 4 !
46: CONST TMB4_D1E : TM : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

TMB66 (B–Tm)

Id: phase:b-tm:tmb66; status assigned
Structure: YB66 · cF1936 · Fm-3c (226); type st:yb66-cf1936; 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_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: B 0.9851, Tm 0.0149
Stability: stable in 1 of 1 calculated diagram(s): 300–2372.29 K, x(B) 0.98507–0.98507
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-tm:tmb66
tdb: tdb:TmB-20Wei.tdb:TMB66

TDB models of TMB66 (1): PHASE and CONSTITUENT statements as written

TmB-20Wei.tdb: TMB66, type code %, sha256 f19af3c790bdfb4c…

55: PHASE TMB66 % 2 1 66 !
56: CONST TMB66 : TM : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
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}
}