Fe–Tm phases

8 phases (tier A 5, tier C 2, liquid 1); 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 · Fe–Tm system page · Markdown · field reference

Phases of the Fe–Tm system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:fe-tm:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1828.72 K, x(Tm) 0–0	7	2
FCC_A1 phase:fe-tm:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1184.81–1667.47 K, x(Tm) 0–0	6	2
FE17TM2 phase:fe-tm:fe17tm2	CeMg10 · hP44 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1573.32 K, x(Tm) 0.10526–0.10526	24	2
FE23TM6_D8A phase:fe-tm:fe23tm6-d8a	Mn23Th6 · D8_a · cF116 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1547.2 K, x(Tm) 0.2069–0.2069	8	2
FE2TM_C15 phase:fe-tm:fe2tm-c15	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1575.26 K, x(Tm) 0.33333–0.33333	10	2
FE3TM phase:fe-tm:fe3tm	Ni3Pu · hR12 · R-3m (166)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1552.52 K, x(Tm) 0.25–0.25	20	2
HCP_A3 phase:fe-tm:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–2499.47 K, x(Tm) 0.99552–1	0	2
LIQUID phase:fe-tm:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 1182.58–2500 K, x(Tm) 0–1	23	2

BCC_A2 (Fe–Tm)

Id: phase:fe-tm:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stoichiometry: Fe 1.0000
Stability: stable in 2 of 2 calculated diagram(s): 300–1828.72 K, x(Tm) 0–0
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:fe-tm:bcc-a2
paper: paper:10.1016/j.calphad.2014.01.003:alphaFe, paper:10.1016/j.calphad.2014.01.003:deltaFe
tdb: tdb:FeTm-14Kar.tdb:BCC_A2, tdb:FeTm-19Xu.tdb:BCC_A2

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

FeTm-14Kar.tdb: BCC_A2, type code %B, sha256 33698064a8ea2f8d…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : FE : VA : !

FeTm-19Xu.tdb: BCC_A2, type code %B, sha256 2d52128c27ee96d2…

38: PHASE BCC_A2 %B 2 1 3 !
39: CONST BCC_A2 : FE : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2014.01.003 S. Kardellass, C. Servant, N. Selhaoui, A. Iddaoudi, Thermodynamic evaluations of the iron–lutetium and iron–thulium systems, Calphad 46, 42-54 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101646 L. Xu, J. Wang, S. Li, X.L. Chen, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 66, 101646(2019).
assessment that models this phase

FCC_A1 (Fe–Tm)

Id: phase:fe-tm:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stoichiometry: Fe 1.0000
Stability: stable in 2 of 2 calculated diagram(s): 1184.81–1667.47 K, x(Tm) 0–0
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-tm:fcc-a1
paper: paper:10.1016/j.calphad.2014.01.003:gammaFe
tdb: tdb:FeTm-14Kar.tdb:FCC_A1, tdb:FeTm-19Xu.tdb:FCC_A1

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

FeTm-14Kar.tdb: FCC_A1, type code %A, sha256 33698064a8ea2f8d…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : FE : VA : !

FeTm-19Xu.tdb: FCC_A1, type code %A, sha256 2d52128c27ee96d2…

33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : FE : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2014.01.003 S. Kardellass, C. Servant, N. Selhaoui, A. Iddaoudi, Thermodynamic evaluations of the iron–lutetium and iron–thulium systems, Calphad 46, 42-54 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101646 L. Xu, J. Wang, S. Li, X.L. Chen, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 66, 101646(2019).
assessment that models this phase

FE17TM2 (Fe–Tm)

Id: phase:fe-tm:fe17tm2; status assigned
Structure: CeMg10 · hP44 · P6_3/mmc (194); type st:cemg10-hp44; 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: Fe 0.8947, Tm 0.1053
Stability: stable in 2 of 2 calculated diagram(s): 300–1573.32 K, x(Tm) 0.10526–0.10526
Literature: 24 values (24 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:fe-tm:fe17tm2
paper: paper:10.1016/j.calphad.2014.01.003:Fe17Tm2, paper:10.1016/j.calphad.2014.01.003:Fe17Tm2(no stable)
tdb: tdb:FeTm-14Kar.tdb:FE17TM2, tdb:FeTm-19Xu.tdb:FE17TM2

TDB models of FE17TM2 (2): PHASE and CONSTITUENT statements as written

FeTm-14Kar.tdb: FE17TM2, type code %A, sha256 33698064a8ea2f8d…

45: PHASE FE17TM2 %A 2 17 2 !
46: CONST FE17TM2 : FE : TM : !

FeTm-19Xu.tdb: FE17TM2, type code %A, sha256 2d52128c27ee96d2…

48: PHASE FE17TM2 %A 2 17 2 !
49: CONST FE17TM2 : FE : TM : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2014.01.003 S. Kardellass, C. Servant, N. Selhaoui, A. Iddaoudi, Thermodynamic evaluations of the iron–lutetium and iron–thulium systems, Calphad 46, 42-54 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101646 L. Xu, J. Wang, S. Li, X.L. Chen, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 66, 101646(2019).
assessment that models this phase
doi:10.1016/0364-5916(91)90030-n A.T. Dinsdale, SGTE data for pure elements, Calphad 15, 317-425 (1991).
cited as the source of values for this phase
doi:10.1021/je7003353 D. Gozzi, M. Iervolino, A. Latini, Thermodynamics of Fe-Rich Intermetallics along the Rare Earth Series, J. Chem. Eng. Data 52, 2350-2358 (2007).
cited as the source of values for this phase

FE23TM6_D8A (Fe–Tm)

Id: phase:fe-tm:fe23tm6-d8a; status assigned
Structure: Mn23Th6 · D8_a · cF116 · Fm-3m (225); type st:d8-a-mn23th6-cf116; tier A: standard phase name; confidence high
Stoichiometry: Fe 0.7931, Tm 0.2069
Stability: stable in 2 of 2 calculated diagram(s): 300–1547.2 K, x(Tm) 0.2069–0.2069
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-tm:fe23tm6-d8a
paper: paper:10.1016/j.calphad.2014.01.003:Fe23Tm6
tdb: tdb:FeTm-14Kar.tdb:FE23TM6_D8A, tdb:FeTm-19Xu.tdb:FE23TM6_D8A

TDB models of FE23TM6_D8A (2): PHASE and CONSTITUENT statements as written

FeTm-14Kar.tdb: FE23TM6_D8A, type code %A, sha256 33698064a8ea2f8d…

50: PHASE FE23TM6_D8A %A 2 23 6 !
51: CONST FE23TM6_D8A : FE : TM : !

FeTm-19Xu.tdb: FE23TM6_D8A, type code %A, sha256 2d52128c27ee96d2…

53: PHASE FE23TM6_D8A %A 2 23 6 !
54: CONST FE23TM6_D8A : FE : TM : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2014.01.003 S. Kardellass, C. Servant, N. Selhaoui, A. Iddaoudi, Thermodynamic evaluations of the iron–lutetium and iron–thulium systems, Calphad 46, 42-54 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101646 L. Xu, J. Wang, S. Li, X.L. Chen, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 66, 101646(2019).
assessment that models this phase

FE2TM_C15 (Fe–Tm)

Id: phase:fe-tm:fe2tm-c15; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaabgmyp and oqmd-17236, space group 227
Stoichiometry: Fe 0.6667, Tm 0.3333
Stability: stable in 2 of 2 calculated diagram(s): 300–1575.26 K, x(Tm) 0.33333–0.33333
Literature: 10 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:fe-tm:fe2tm-c15
mp: mp:mp-aaabgmyp
oqmd: oqmd:oqmd-17236
paper: paper:10.1016/j.calphad.2014.01.003:Fe2Tm
tdb: tdb:FeTm-14Kar.tdb:FE2TM_C15, tdb:FeTm-19Xu.tdb:FE2TM_C15

TDB models of FE2TM_C15 (2): PHASE and CONSTITUENT statements as written

FeTm-14Kar.tdb: FE2TM_C15, type code %A, sha256 33698064a8ea2f8d…

60: PHASE FE2TM_C15 %A 2 2 1 !
61: CONST FE2TM_C15 : FE : TM : !

FeTm-19Xu.tdb: FE2TM_C15, type code %A, sha256 2d52128c27ee96d2…

63: PHASE FE2TM_C15 %A 2 2 1 !
64: CONST FE2TM_C15 : FE : TM : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2014.01.003 S. Kardellass, C. Servant, N. Selhaoui, A. Iddaoudi, Thermodynamic evaluations of the iron–lutetium and iron–thulium systems, Calphad 46, 42-54 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101646 L. Xu, J. Wang, S. Li, X.L. Chen, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 66, 101646(2019).
assessment that models this phase

FE3TM (Fe–Tm)

Id: phase:fe-tm:fe3tm; status assigned
Structure: Ni3Pu · hR12 · R-3m (166); type st:ni3pu-hr12; 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_166_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Fe 0.7500, Tm 0.2500
Stability: stable in 2 of 2 calculated diagram(s): 300–1552.52 K, x(Tm) 0.25–0.25
Literature: 20 values (20 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-tm:fe3tm
paper: paper:10.1016/j.calphad.2014.01.003:Fe3Tm
tdb: tdb:FeTm-14Kar.tdb:FE3TM, tdb:FeTm-19Xu.tdb:FE3TM

TDB models of FE3TM (2): PHASE and CONSTITUENT statements as written

FeTm-14Kar.tdb: FE3TM, type code %A, sha256 33698064a8ea2f8d…

55: PHASE FE3TM %A 2 3 1 !
56: CONST FE3TM : FE : TM : !

FeTm-19Xu.tdb: FE3TM, type code %A, sha256 2d52128c27ee96d2…

58: PHASE FE3TM %A 2 3 1 !
59: CONST FE3TM : FE : TM : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2014.01.003 S. Kardellass, C. Servant, N. Selhaoui, A. Iddaoudi, Thermodynamic evaluations of the iron–lutetium and iron–thulium systems, Calphad 46, 42-54 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101646 L. Xu, J. Wang, S. Li, X.L. Chen, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 66, 101646(2019).
assessment that models this phase
doi:10.1016/0364-5916(91)90030-n A.T. Dinsdale, SGTE data for pure elements, Calphad 15, 317-425 (1991).
cited as the source of values for this phase

HCP_A3 (Fe–Tm)

Id: phase:fe-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): 300–2499.47 K, x(Tm) 0.99552–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:fe-tm:hcp-a3
tdb: tdb:FeTm-14Kar.tdb:HCP_A3, tdb:FeTm-19Xu.tdb:HCP_A3

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

FeTm-14Kar.tdb: HCP_A3, type code %A, sha256 33698064a8ea2f8d…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : FE TM% : VA : !

FeTm-19Xu.tdb: HCP_A3, type code %A, sha256 2d52128c27ee96d2…

43: PHASE HCP_A3 %A 2 1 0.5 !
44: CONST HCP_A3 : FE TM% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2014.01.003 S. Kardellass, C. Servant, N. Selhaoui, A. Iddaoudi, Thermodynamic evaluations of the iron–lutetium and iron–thulium systems, Calphad 46, 42-54 (2014).
assessment that models this phase
doi:10.1016/j.calphad.2019.101646 L. Xu, J. Wang, S. Li, X.L. Chen, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 66, 101646(2019).
assessment that models this phase

LIQUID (Fe–Tm)

Id: phase:fe-tm:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1182.58–2500 K, x(Tm) 0–1
Literature: 23 values (23 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:fe-tm:liquid
paper: paper:10.1016/j.calphad.2014.01.003:L, paper:10.1016/j.calphad.2014.01.003:Liq
tdb: tdb:FeTm-14Kar.tdb:LIQUID, tdb:FeTm-19Xu.tdb:LIQUID

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

FeTm-14Kar.tdb: LIQUID, type code %, sha256 33698064a8ea2f8d…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : FE TM : !

FeTm-19Xu.tdb: LIQUID, type code %, sha256 2d52128c27ee96d2…

28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : FE TM : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2014.01.003 S. Kardellass, C. Servant, N. Selhaoui, A. Iddaoudi, Thermodynamic evaluations of the iron–lutetium and iron–thulium systems, Calphad 46, 42-54 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2019.101646 L. Xu, J. Wang, S. Li, X.L. Chen, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 66, 101646(2019).
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}
}