Fe–Sm 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–Sm system page · Markdown · field reference

Phases of the Fe–Sm system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:fe-sm:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–2500 K, x(Sm) 0–1	0	2
FCC_A1 phase:fe-sm:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1160.33–1668.46 K, x(Sm) 0–0.00296	2	2
FE17SM2 phase:fe-sm:fe17sm2	Th2Zn17 · hR19 · R-3m (166)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1555.73 K, x(Sm) 0.10526–0.10526	17	2
FE2SM_C15 phase:fe-sm:fe2sm-c15	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1173.81 K, x(Sm) 0.33333–0.33333	4	2
FE3SM phase:fe-sm:fe3sm	Ni3Pu · hR12 · R-3m (166)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1286.86 K, x(Sm) 0.25–0.25	4	2
HCP_A3 phase:fe-sm:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 977–1196 K, x(Sm) 0.34–1	0	2
LIQUID phase:fe-sm:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 994.67–2500 K, x(Sm) 0–1	8	2
RHOMB_C19 phase:fe-sm:rhomb-c19	CdCl2 · C19 · hR3 · R-3m (166)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1192.36 K, x(Sm) 0.99953–1	2	2

BCC_A2 (Fe–Sm)

Id: phase:fe-sm: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): 300–2500 K, x(Sm) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:fe-sm:bcc-a2
tdb: tdb:FeSm-02Zin.tdb:BCC_A2, tdb:FeSm-17Che.tdb:BCC_A2

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

FeSm-02Zin.tdb: BCC_A2, type code %B, sha256 f9381a4b6ae265f7…

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

FeSm-17Che.tdb: BCC_A2, type code %B, sha256 ee2803e2feb0f407…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/S0925-8388(01)01990-9 M. Zinkevich, N. Mattern, A. Handstein, O. Gutfleisch, J. Alloys Compd., 339, 118-139(2002).
assessment that models this phase

FCC_A1 (Fe–Sm)

Id: phase:fe-sm: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): 1160.33–1668.46 K, x(Sm) 0–0.00296
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-sm:fcc-a1
paper: paper:10.1016/s0925-8388(01)01990-9:f.c.c. Fe
tdb: tdb:FeSm-02Zin.tdb:FCC_A1, tdb:FeSm-17Che.tdb:FCC_A1

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

FeSm-02Zin.tdb: FCC_A1, type code %A, sha256 f9381a4b6ae265f7…

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

FeSm-17Che.tdb: FCC_A1, type code %A, sha256 ee2803e2feb0f407…

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

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(01)01990-9 M. Zinkevich, N. Mattern, A. Handstein, O. Gutfleisch, J. Alloys Compd., 339, 118-139(2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/0022-5088(71)90124-x K.H.J. Buschow, The samarium-iron system, Journal of the Less Common Metals 25, 131-134 (1971).
cited as the source of values for this phase

FE17SM2 (Fe–Sm)

Id: phase:fe-sm:fe17sm2; status assigned
Structure: Th2Zn17 · hR19 · R-3m (166); type st:th2zn17-hr19; 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, Sm 0.1053
Stability: stable in 2 of 2 calculated diagram(s): 300–1555.73 K, x(Sm) 0.10526–0.10526
Literature: 17 values (17 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-sm:fe17sm2
paper: paper:10.1016/s0925-8388(01)01990-9:Fe17Sm2
tdb: tdb:FeSm-02Zin.tdb:FE17SM2, tdb:FeSm-17Che.tdb:FE17SM2

TDB models of FE17SM2 (2): PHASE and CONSTITUENT statements as written

FeSm-02Zin.tdb: FE17SM2, type code %A, sha256 f9381a4b6ae265f7…

51: PHASE FE17SM2 %A 2 17 2 !
52: CONST FE17SM2 : FE : SM : !

FeSm-17Che.tdb: FE17SM2, type code %A, sha256 ee2803e2feb0f407…

49: PHASE FE17SM2 %A 2 17 2 !
50: CONST FE17SM2 : FE : SM : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(01)01990-9 M. Zinkevich, N. Mattern, A. Handstein, O. Gutfleisch, J. Alloys Compd., 339, 118-139(2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/0022-5088(71)90124-x K.H.J. Buschow, The samarium-iron system, Journal of the Less Common Metals 25, 131-134 (1971).
cited as the source of values for this phase

FE2SM_C15 (Fe–Sm)

Id: phase:fe-sm:fe2sm-c15; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Stoichiometry: Fe 0.6667, Sm 0.3333
Stability: stable in 2 of 2 calculated diagram(s): 300–1173.81 K, x(Sm) 0.33333–0.33333
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-sm:fe2sm-c15
paper: paper:10.1016/s0925-8388(01)01990-9:Fe2Sm
tdb: tdb:FeSm-02Zin.tdb:FE2SM_C15, tdb:FeSm-17Che.tdb:FE2SM_C15

TDB models of FE2SM_C15 (2): PHASE and CONSTITUENT statements as written

FeSm-02Zin.tdb: FE2SM_C15, type code %A, sha256 f9381a4b6ae265f7…

61: PHASE FE2SM_C15 %A 2 2 1 !
62: CONST FE2SM_C15 : FE : SM : !

FeSm-17Che.tdb: FE2SM_C15, type code %A, sha256 ee2803e2feb0f407…

59: PHASE FE2SM_C15 %A 2 2 1 !
60: CONST FE2SM_C15 : FE : SM : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(01)01990-9 M. Zinkevich, N. Mattern, A. Handstein, O. Gutfleisch, J. Alloys Compd., 339, 118-139(2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/0022-5088(71)90124-x K.H.J. Buschow, The samarium-iron system, Journal of the Less Common Metals 25, 131-134 (1971).
cited as the source of values for this phase

FE3SM (Fe–Sm)

Id: phase:fe-sm:fe3sm; 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 (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 0.7500, Sm 0.2500
Stability: stable in 2 of 2 calculated diagram(s): 300–1286.86 K, x(Sm) 0.25–0.25
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-sm:fe3sm
paper: paper:10.1016/s0925-8388(01)01990-9:Fe3Sm
tdb: tdb:FeSm-02Zin.tdb:FE3SM, tdb:FeSm-17Che.tdb:FE3SM

TDB models of FE3SM (2): PHASE and CONSTITUENT statements as written

FeSm-02Zin.tdb: FE3SM, type code %A, sha256 f9381a4b6ae265f7…

56: PHASE FE3SM %A 2 3 1 !
57: CONST FE3SM : FE : SM : !

FeSm-17Che.tdb: FE3SM, type code %A, sha256 ee2803e2feb0f407…

54: PHASE FE3SM %A 2 3 1 !
55: CONST FE3SM : FE : SM : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(01)01990-9 M. Zinkevich, N. Mattern, A. Handstein, O. Gutfleisch, J. Alloys Compd., 339, 118-139(2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/0022-5088(71)90124-x K.H.J. Buschow, The samarium-iron system, Journal of the Less Common Metals 25, 131-134 (1971).
cited as the source of values for this phase

HCP_A3 (Fe–Sm)

Id: phase:fe-sm: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): 977–1196 K, x(Sm) 0.34–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:fe-sm:hcp-a3
tdb: tdb:FeSm-02Zin.tdb:HCP_A3, tdb:FeSm-17Che.tdb:HCP_A3

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

FeSm-02Zin.tdb: HCP_A3, type code %A, sha256 f9381a4b6ae265f7…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : FE SM% : VA : !

FeSm-17Che.tdb: HCP_A3, type code %A, sha256 ee2803e2feb0f407…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : FE SM% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/S0925-8388(01)01990-9 M. Zinkevich, N. Mattern, A. Handstein, O. Gutfleisch, J. Alloys Compd., 339, 118-139(2002).
assessment that models this phase

LIQUID (Fe–Sm)

Id: phase:fe-sm:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 994.67–2500 K, x(Sm) 0–1
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-sm:liquid
paper: paper:10.1016/s0925-8388(01)01990-9:Liquid
tdb: tdb:FeSm-02Zin.tdb:LIQUID, tdb:FeSm-17Che.tdb:LIQUID

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

FeSm-02Zin.tdb: LIQUID, type code %, sha256 f9381a4b6ae265f7…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : FE SM : !

FeSm-17Che.tdb: LIQUID, type code %, sha256 ee2803e2feb0f407…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : FE SM : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(01)01990-9 M. Zinkevich, N. Mattern, A. Handstein, O. Gutfleisch, J. Alloys Compd., 339, 118-139(2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/0022-5088(71)90124-x K.H.J. Buschow, The samarium-iron system, Journal of the Less Common Metals 25, 131-134 (1971).
cited as the source of values for this phase

RHOMB_C19 (Fe–Sm)

Id: phase:fe-sm:rhomb-c19; status assigned
Structure: CdCl2 · C19 · hR3 · R-3m (166); type st:c19-cdcl2-hr3; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–1192.36 K, x(Sm) 0.99953–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-sm:rhomb-c19
paper: paper:10.1016/s0925-8388(01)01990-9:α-Sm
tdb: tdb:FeSm-02Zin.tdb:RHOMB_C19, tdb:FeSm-17Che.tdb:RHOMB_C19

TDB models of RHOMB_C19 (2): PHASE and CONSTITUENT statements as written

FeSm-02Zin.tdb: RHOMB_C19, type code %, sha256 f9381a4b6ae265f7…

46: PHASE RHOMB_C19 % 1 1 !
47: CONST RHOMB_C19 : FE SM% : !

FeSm-17Che.tdb: RHOMB_C19, type code %, sha256 ee2803e2feb0f407…

44: PHASE RHOMB_C19 % 1 1 !
45: CONST RHOMB_C19 : SM : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(01)01990-9 M. Zinkevich, N. Mattern, A. Handstein, O. Gutfleisch, J. Alloys Compd., 339, 118-139(2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/0022-5088(71)90124-x K.H.J. Buschow, The samarium-iron system, Journal of the Less Common Metals 25, 131-134 (1971).
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}
}