Bi–Tm phases

7 phases (tier A 5, tier C 1, liquid 1); 5 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 · Bi–Tm system page · Markdown · field reference

Phases of the Bi–Tm system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
RHOMBOHEDRAL_A7 phase:bi-tm:a7-rhombohedral	alpha-As · A7 · hR2 · R-3m (166)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–544.55 K, x(Tm) 0–0	7	2
BCC_A2 phase:bi-tm:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
BI3TM5 phase:bi-tm:bi3tm5	Bi3Y5 · oP32 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1687.37 K, x(Tm) 0.625–0.625	24	2
BITM_B1 phase:bi-tm:bitm-b1	NaCl · B1 · cF8 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–2020.23 K, x(Tm) 0.5–0.5	21	2
FCC_A1 phase:bi-tm:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
HCP_A3 phase:bi-tm:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–2499.88 K, x(Tm) 0.98985–1	7	2
LIQUID phase:bi-tm:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 535.12–2500 K, x(Tm) 0–1	28	2

RHOMBOHEDRAL_A7 (Bi–Tm)

Id: phase:bi-tm:a7-rhombohedral; status assigned
Structure: alpha-As · A7 · hR2 · R-3m (166); type st:a7-alpha-as-hr2; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–544.55 K, x(Tm) 0–0
Literature: 7 values (7 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:bi-tm:a7-rhombohedral, corpus:phase:bi-tm:rhombohedral-a7
paper: paper:10.1016/j.calphad.2014.11.002:(Bi), paper:10.1016/j.jallcom.2010.03.042:(Bi)
tdb: tdb:BiTm-10Wan.tdb:RHOMBOHEDRAL_A7, tdb:BiTm-15Dja.tdb:RHOMBOHEDRAL_A7

TDB models of RHOMBOHEDRAL_A7 (2): PHASE and CONSTITUENT statements as written

BiTm-10Wan.tdb: RHOMBOHEDRAL_A7, type code %, sha256 0fe52d02cf6d5c2a…

42: PHASE RHOMBOHEDRAL_A7 % 1 1 !
43: CONST RHOMBOHEDRAL_A7 : BI% TM : !

BiTm-15Dja.tdb: RHOMBOHEDRAL_A7, type code %, sha256 eece954098bcef12…

44: PHASE RHOMBOHEDRAL_A7 % 1 1 !
45: CONST RHOMBOHEDRAL_A7 : BI : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2014.11.002 Y. Djaballah, A. Said Amer, Ş. Uğur, G. Uğur, A. Hidoussi, A. Belgacem-Bouzida, Thermodynamic description of the Bi–Cs and Bi–Tm system supported by first-principles calculations, Calphad 48, 72-78 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2010.03.042 C.P. Wang, H.L. Zhang, A.T. Tang, F.S. Pan, X.J. Liu, Thermodynamic assessments of the Bi–Nd and Bi–Tm systems, Journal of Alloys and Compounds 502, 43-48 (2010).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/0925-8388(96)02314-6 M.N. Abdusalyamova, A.G. Chuiko, E.I. Shishkin, O.I. Rachmatov, Phase diagrams and thermodynamic properties of rare earth-bismuth systems, Journal of Alloys and Compounds 240, 272-277 (1996).
cited as the source of values for this phase
doi:10.1023/a:1021887102509 V. D. Abulkhaev, Phase Relations and Properties of Alloys in the Tm–Bi System, Inorganic Materials 39, 47-49 (2003).
cited as the source of values for this phase

BCC_A2 (Bi–Tm)

Id: phase:bi-tm:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; 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:bi-tm:bcc-a2
tdb: tdb:BiTm-10Wan.tdb:BCC_A2, tdb:BiTm-15Dja.tdb:BCC_A2

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

BiTm-10Wan.tdb: BCC_A2, type code %B, sha256 0fe52d02cf6d5c2a…

32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : BI TM : VA : !

BiTm-15Dja.tdb: BCC_A2, type code %B, sha256 eece954098bcef12…

34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : BI TM : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2014.11.002 Y. Djaballah, A. Said Amer, Ş. Uğur, G. Uğur, A. Hidoussi, A. Belgacem-Bouzida, Thermodynamic description of the Bi–Cs and Bi–Tm system supported by first-principles calculations, Calphad 48, 72-78 (2015).
assessment that models this phase
doi:10.1016/j.jallcom.2010.03.042 C.P. Wang, H.L. Zhang, A.T. Tang, F.S. Pan, X.J. Liu, Thermodynamic assessments of the Bi–Nd and Bi–Tm systems, Journal of Alloys and Compounds 502, 43-48 (2010).
assessment that models this phase

BI3TM5 (Bi–Tm)

Id: phase:bi-tm:bi3tm5; status assigned
Structure: Bi3Y5 · oP32 · Pnma (62); type st:bi3y5-op32; 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 (dft_space_group_62_matches_3_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Bi 0.3750, Tm 0.6250
Stability: stable in 2 of 2 calculated diagram(s): 300–1687.37 K, x(Tm) 0.625–0.625
Literature: 24 values (24 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-tm:bi3tm5
paper: paper:10.1016/j.calphad.2014.11.002:Bi3Tm5, paper:10.1016/j.jallcom.2010.03.042:Bi3Tm5
tdb: tdb:BiTm-10Wan.tdb:BI3TM5, tdb:BiTm-15Dja.tdb:BI3TM5

TDB models of BI3TM5 (2): PHASE and CONSTITUENT statements as written

BiTm-10Wan.tdb: BI3TM5, type code %, sha256 0fe52d02cf6d5c2a…

52: PHASE BI3TM5 % 2 3 5 !
53: CONST BI3TM5 : BI : TM : !

BiTm-15Dja.tdb: BI3TM5, type code %, sha256 eece954098bcef12…

54: PHASE BI3TM5 % 2 3 5 !
55: CONST BI3TM5 : BI : TM : !

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2014.11.002 Y. Djaballah, A. Said Amer, Ş. Uğur, G. Uğur, A. Hidoussi, A. Belgacem-Bouzida, Thermodynamic description of the Bi–Cs and Bi–Tm system supported by first-principles calculations, Calphad 48, 72-78 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2010.03.042 C.P. Wang, H.L. Zhang, A.T. Tang, F.S. Pan, X.J. Liu, Thermodynamic assessments of the Bi–Nd and Bi–Tm systems, Journal of Alloys and Compounds 502, 43-48 (2010).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/0925-8388(96)02314-6 M.N. Abdusalyamova, A.G. Chuiko, E.I. Shishkin, O.I. Rachmatov, Phase diagrams and thermodynamic properties of rare earth-bismuth systems, Journal of Alloys and Compounds 240, 272-277 (1996).
cited as the source of values for this phase
doi:10.1023/a:1021887102509 V. D. Abulkhaev, Phase Relations and Properties of Alloys in the Tm–Bi System, Inorganic Materials 39, 47-49 (2003).
cited as the source of values for this phase
doi:10.1016/0022-5088(75)90038-7 K. Yoshihara, J.B. Taylor, L.D. Calvert, J.G. Despault, Rare-earth bismuthides, Journal of the Less Common Metals 41, 329-337 (1975).
cited as the source of values for this phase
doi:10.1016/0022-5088(84)90320-5 C. Colinet, A. Pasturel, A. Percheron-Guégan, J.C. Achard, Enthalpies of formation of liquid and solid binary alloys of lead, antimony and bismuth with rare earth elements, Journal of the Less Common Metals 102, 239-249 (1984).
cited as the source of values for this phase

BITM_B1 (Bi–Tm)

Id: phase:bi-tm:bitm-b1; status assigned
Structure: NaCl · B1 · cF8 · Fm-3m (225); type st:b1-nacl-cf8; tier A: standard phase name; confidence high
Stoichiometry: Bi 0.5000, Tm 0.5000
Stability: stable in 2 of 2 calculated diagram(s): 300–2020.23 K, x(Tm) 0.5–0.5
Literature: 21 values (21 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-tm:bitm-b1
paper: paper:10.1016/j.calphad.2014.11.002:BiTm, paper:10.1016/j.jallcom.2010.03.042:BiTm
tdb: tdb:BiTm-10Wan.tdb:BITM_B1, tdb:BiTm-15Dja.tdb:BITM_B1

TDB models of BITM_B1 (2): PHASE and CONSTITUENT statements as written

BiTm-10Wan.tdb: BITM_B1, type code %, sha256 0fe52d02cf6d5c2a…

47: PHASE BITM_B1 % 2 1 1 !
48: CONST BITM_B1 : BI : TM : !

BiTm-15Dja.tdb: BITM_B1, type code %, sha256 eece954098bcef12…

49: PHASE BITM_B1 % 2 1 1 !
50: CONST BITM_B1 : BI : TM : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2014.11.002 Y. Djaballah, A. Said Amer, Ş. Uğur, G. Uğur, A. Hidoussi, A. Belgacem-Bouzida, Thermodynamic description of the Bi–Cs and Bi–Tm system supported by first-principles calculations, Calphad 48, 72-78 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2010.03.042 C.P. Wang, H.L. Zhang, A.T. Tang, F.S. Pan, X.J. Liu, Thermodynamic assessments of the Bi–Nd and Bi–Tm systems, Journal of Alloys and Compounds 502, 43-48 (2010).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/0925-8388(96)02314-6 M.N. Abdusalyamova, A.G. Chuiko, E.I. Shishkin, O.I. Rachmatov, Phase diagrams and thermodynamic properties of rare earth-bismuth systems, Journal of Alloys and Compounds 240, 272-277 (1996).
cited as the source of values for this phase
doi:10.1023/a:1021887102509 V. D. Abulkhaev, Phase Relations and Properties of Alloys in the Tm–Bi System, Inorganic Materials 39, 47-49 (2003).
cited as the source of values for this phase

FCC_A1 (Bi–Tm)

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

Names (3): corpus: corpus:phase:bi-tm:fcc-a1
tdb: tdb:BiTm-10Wan.tdb:FCC_A1, tdb:BiTm-15Dja.tdb:FCC_A1

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

BiTm-10Wan.tdb: FCC_A1, type code %A, sha256 0fe52d02cf6d5c2a…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : BI : VA : !

BiTm-15Dja.tdb: FCC_A1, type code %A, sha256 eece954098bcef12…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : BI TM : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2014.11.002 Y. Djaballah, A. Said Amer, Ş. Uğur, G. Uğur, A. Hidoussi, A. Belgacem-Bouzida, Thermodynamic description of the Bi–Cs and Bi–Tm system supported by first-principles calculations, Calphad 48, 72-78 (2015).
assessment that models this phase
doi:10.1016/j.jallcom.2010.03.042 C.P. Wang, H.L. Zhang, A.T. Tang, F.S. Pan, X.J. Liu, Thermodynamic assessments of the Bi–Nd and Bi–Tm systems, Journal of Alloys and Compounds 502, 43-48 (2010).
assessment that models this phase

HCP_A3 (Bi–Tm)

Id: phase:bi-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
Stability: stable in 2 of 2 calculated diagram(s): 300–2499.88 K, x(Tm) 0.98985–1
Literature: 7 values (7 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-tm:hcp-a3
paper: paper:10.1016/j.calphad.2014.11.002:(Tm), paper:10.1016/j.jallcom.2010.03.042:(Tm)
tdb: tdb:BiTm-10Wan.tdb:HCP_A3, tdb:BiTm-15Dja.tdb:HCP_A3

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

BiTm-10Wan.tdb: HCP_A3, type code %A, sha256 0fe52d02cf6d5c2a…

37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : BI TM% : VA: !

BiTm-15Dja.tdb: HCP_A3, type code %A, sha256 eece954098bcef12…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : BI TM% : VA: !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2014.11.002 Y. Djaballah, A. Said Amer, Ş. Uğur, G. Uğur, A. Hidoussi, A. Belgacem-Bouzida, Thermodynamic description of the Bi–Cs and Bi–Tm system supported by first-principles calculations, Calphad 48, 72-78 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2010.03.042 C.P. Wang, H.L. Zhang, A.T. Tang, F.S. Pan, X.J. Liu, Thermodynamic assessments of the Bi–Nd and Bi–Tm systems, Journal of Alloys and Compounds 502, 43-48 (2010).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/0925-8388(96)02314-6 M.N. Abdusalyamova, A.G. Chuiko, E.I. Shishkin, O.I. Rachmatov, Phase diagrams and thermodynamic properties of rare earth-bismuth systems, Journal of Alloys and Compounds 240, 272-277 (1996).
cited as the source of values for this phase
doi:10.1023/a:1021887102509 V. D. Abulkhaev, Phase Relations and Properties of Alloys in the Tm–Bi System, Inorganic Materials 39, 47-49 (2003).
cited as the source of values for this phase

LIQUID (Bi–Tm)

Id: phase:bi-tm:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 535.12–2500 K, x(Tm) 0–1
Literature: 28 values (28 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-tm:liquid
paper: paper:10.1016/j.calphad.2014.11.002:L, paper:10.1016/j.jallcom.2010.03.042:L
tdb: tdb:BiTm-10Wan.tdb:LIQUID, tdb:BiTm-15Dja.tdb:LIQUID

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

BiTm-10Wan.tdb: LIQUID, type code %, sha256 0fe52d02cf6d5c2a…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : BI TM : !

BiTm-15Dja.tdb: LIQUID, type code %, sha256 eece954098bcef12…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : BI TM : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2014.11.002 Y. Djaballah, A. Said Amer, Ş. Uğur, G. Uğur, A. Hidoussi, A. Belgacem-Bouzida, Thermodynamic description of the Bi–Cs and Bi–Tm system supported by first-principles calculations, Calphad 48, 72-78 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2010.03.042 C.P. Wang, H.L. Zhang, A.T. Tang, F.S. Pan, X.J. Liu, Thermodynamic assessments of the Bi–Nd and Bi–Tm systems, Journal of Alloys and Compounds 502, 43-48 (2010).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/0925-8388(96)02314-6 M.N. Abdusalyamova, A.G. Chuiko, E.I. Shishkin, O.I. Rachmatov, Phase diagrams and thermodynamic properties of rare earth-bismuth systems, Journal of Alloys and Compounds 240, 272-277 (1996).
cited as the source of values for this phase
doi:10.1023/a:1021887102509 V. D. Abulkhaev, Phase Relations and Properties of Alloys in the Tm–Bi System, Inorganic Materials 39, 47-49 (2003).
cited as the source of 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}
}