Co–Sm phases

14 phases (tier A 6, tier C 4, liquid 1, needs_review 3); 14 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 · Co–Sm system page · Markdown · field reference

Phases of the Co–Sm system (14)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:co-sm:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 946.22–2500 K, x(Sm) 0.92838–1	4	2
CO17SM2 phase:co-sm:co17sm2	Th2Zn17 · hR19 · R-3m (166)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1619.07 K, x(Sm) 0.10526–0.1188	22	2
CO19SM5 phase:co-sm:co19sm5		needs_review	stable in 2 of 2 calculated diagram(s): 300–1542.98 K, x(Sm) 0.20833–0.20833	14	2
CO2SM_C15 phase:co-sm:co2sm-c15	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1345.64 K, x(Sm) 0.33333–0.33333	13	2
CO2SM5 phase:co-sm:co2sm5	Mn5C2 · mC28 · C2/c (15)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–882.86 K, x(Sm) 0.71429–0.71429	8	1
CO3SM phase:co-sm:co3sm	Ni3Pu · hR12 · R-3m (166)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1477.83 K, x(Sm) 0.25–0.25	12	2
CO4SM9 phase:co-sm:co4sm9		needs_review	stable in 1 of 1 calculated diagram(s): 300–884.47 K, x(Sm) 0.69231–0.69231	6	1
CO5SM phase:co-sm:co5sm	Cu7Tb · hP8 · P6/mmm (191)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 1085.25–1593.2 K, x(Sm) 0.14742–0.17864	14	2
CO7SM2 phase:co-sm:co7sm2		needs_review	stable in 2 of 2 calculated diagram(s): 300–1517.44 K, x(Sm) 0.22222–0.22222	12	2
COSM3_D011 phase:co-sm:cosm3-d011	Fe3C · D0_11 · oP16 · Pnma (62)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–977.48 K, x(Sm) 0.75–0.75	23	2
FCC_A1 phase:co-sm:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 694.99–1777.38 K, x(Sm) 0–0.00326	6	2
HCP_A3 phase:co-sm:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1340 K, x(Sm) 0–1	4	2
LIQUID phase:co-sm:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 865.4–2500 K, x(Sm) 0–1	68	2
RHOMB_C19 phase:co-sm:rhomb-c19	CdCl2 · C19 · hR3 · R-3m (166)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1193.85 K, x(Sm) 0.99702–1	5	2

BCC_A2 (Co–Sm)

Id: phase:co-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): 946.22–2500 K, x(Sm) 0.92838–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:co-sm:bcc-a2
paper: paper:10.1016/j.calphad.2011.06.001:γ(Sm)
tdb: tdb:CoSm-11Yua.tdb:BCC_A2, tdb:CoSm-98Su.tdb:BCC_A2

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

CoSm-11Yua.tdb: BCC_A2, type code %B, sha256 2d48fb36760f4615…

37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : CO SM% : VA : !

CoSm-98Su.tdb: BCC_A2, type code %B, sha256 f5878d03ef199ecd…

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

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase
doi:10.1016/j.jallcom.2010.08.035 Y. Yuan, S. Delsante, J. Yi, G. Borzone, A revision of the Sm-rich region of the Sm–Co system, Journal of Alloys and Compounds 508, 309-314 (2010).
cited as the source of values for this phase

CO17SM2 (Co–Sm)

Id: phase:co-sm:co17sm2; 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_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): 300–1619.07 K, x(Sm) 0.10526–0.1188
Literature: 22 values (22 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sm:co17sm2
paper: paper:10.1016/j.calphad.2011.06.001:Sm2Co17, paper:10.1016/s0925-8388(97)00540-9:Co17Sm2
tdb: tdb:CoSm-11Yua.tdb:CO17SM2, tdb:CoSm-98Su.tdb:CO17SM2

TDB models of CO17SM2 (2): PHASE and CONSTITUENT statements as written

CoSm-11Yua.tdb: CO17SM2, type code %A, sha256 2d48fb36760f4615…

52: PHASE CO17SM2 %A 3 0.833333 0.111111 0.055556 !
53: CONST CO17SM2 : CO : SM : CO2 SM : !

CoSm-98Su.tdb: CO17SM2, type code %A, sha256 f5878d03ef199ecd…

51: PHASE CO17SM2 %A 2 17 2 !
52: CONST CO17SM2 : CO : SM : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase; reports values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
cited as the source of values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase

CO19SM5 (Co–Sm)

Id: phase:co-sm:co19sm5; status needs_review
No structure assigned. Why: no_on_hull_entry_in_oqmd; no_structure_token; sgte_mmc2_rows_disagree
Candidate (dft_mp): R-3m (166) — on-hull MP Sm5Co19 at x(SM)=0.2083
Candidate (literature_printed): Ce5Co19 · hR24 — printed with a label mapped to this phase
Candidate (sgte_mmc2): Ce5Co19 · hR24 · R-3m (166) — Hallstedt 2025 mmc2 row for CO19SM5: Co19Sm5 (low T), see also Co19Sm5
Candidate (sgte_mmc2): Co19Sm5 · hP48 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for CO19SM5: Co19Sm5 (high T), see also Ce5Co19
Candidate (tdb_comment): Ce5Co19 · hR24 · R-3m — CoSm-11Yua.tdb: 'Prototype Ce5Co19 (hR24, R-3m); low T'
Candidate (tdb_comment): Co19Sm5 · hP48 · P6_3/mmc — CoSm-11Yua.tdb: 'Prototype Co19Sm5 (hP48, P6_3/mmc); high T'
Candidate (tdb_comment): Ce5Co19 · hR24 · R-3m — CoSm-98Su.tdb: 'Prototype Ce5Co19 (hR24, R-3m); low T'
Candidate (tdb_comment): Co19Sm5 · hP48 · P6_3/mmc — CoSm-98Su.tdb: 'Prototype Co19Sm5 (hP48, P6_3/mmc); high T'
Stoichiometry: Co 0.7917, Sm 0.2083
Stability: stable in 2 of 2 calculated diagram(s): 300–1542.98 K, x(Sm) 0.20833–0.20833
Literature: 14 values (14 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sm:co19sm5
paper: paper:10.1016/j.calphad.2011.06.001:Sm5Co19, paper:10.1016/s0925-8388(97)00540-9:Co19Sm5
tdb: tdb:CoSm-11Yua.tdb:CO19SM5, tdb:CoSm-98Su.tdb:CO19SM5

TDB models of CO19SM5 (2): PHASE and CONSTITUENT statements as written

CoSm-11Yua.tdb: CO19SM5, type code %A, sha256 2d48fb36760f4615…

63: PHASE CO19SM5 %A 2 0.791667 0.208333 !
64: CONST CO19SM5 : CO : SM : !

CoSm-98Su.tdb: CO19SM5, type code %A, sha256 f5878d03ef199ecd…

62: PHASE CO19SM5 %A 2 19 5 !
63: CONST CO19SM5 : CO : SM : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase; reports values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
cited as the source of values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase

CO2SM_C15 (Co–Sm)

Id: phase:co-sm:co2sm-c15; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Stoichiometry: Co 0.6667, Sm 0.3333
Stability: stable in 2 of 2 calculated diagram(s): 300–1345.64 K, x(Sm) 0.33333–0.33333
Literature: 13 values (13 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sm:co2sm-c15
paper: paper:10.1016/j.calphad.2011.06.001:SmCo2, paper:10.1016/s0925-8388(97)00540-9:Co2Sm
tdb: tdb:CoSm-11Yua.tdb:CO2SM_C15, tdb:CoSm-98Su.tdb:CO2SM_C15

TDB models of CO2SM_C15 (2): PHASE and CONSTITUENT statements as written

CoSm-11Yua.tdb: CO2SM_C15, type code %A, sha256 2d48fb36760f4615…

79: PHASE CO2SM_C15 %A 2 0.666667 0.333333 !
80: CONST CO2SM_C15 : CO : SM : !

CoSm-98Su.tdb: CO2SM_C15, type code %A, sha256 f5878d03ef199ecd…

78: PHASE CO2SM_C15 %A 2 2 1 !
79: CONST CO2SM_C15 : CO : SM : !

Example references (5 of 5; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
cited as the source of values for this phase
doi:10.1016/j.jallcom.2010.08.035 Y. Yuan, S. Delsante, J. Yi, G. Borzone, A revision of the Sm-rich region of the Sm–Co system, Journal of Alloys and Compounds 508, 309-314 (2010).
cited as the source of values for this phase

CO2SM5 (Co–Sm)

Id: phase:co-sm:co2sm5; status assigned
Structure: Mn5C2 · mC28 · C2/c (15); type st:mn5c2-mc28; 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_15_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Co 0.2857, Sm 0.7143
Stability: stable in 1 of 1 calculated diagram(s): 300–882.86 K, x(Sm) 0.71429–0.71429
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:co-sm:co2sm5
paper: paper:10.1016/j.calphad.2011.06.001:Sm5Co2
tdb: tdb:CoSm-11Yua.tdb:CO2SM5

TDB models of CO2SM5 (1): PHASE and CONSTITUENT statements as written

CoSm-11Yua.tdb: CO2SM5, type code %, sha256 2d48fb36760f4615…

84: PHASE CO2SM5 % 2 0.285714 0.714286 !
85: CONST CO2SM5 : CO : SM : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase
doi:10.1016/j.jallcom.2010.08.035 Y. Yuan, S. Delsante, J. Yi, G. Borzone, A revision of the Sm-rich region of the Sm–Co system, Journal of Alloys and Compounds 508, 309-314 (2010).
cited as the source of values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
cited as the source of values for this phase

CO3SM (Co–Sm)

Id: phase:co-sm:co3sm; 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: Co 0.7500, Sm 0.2500
Stability: stable in 2 of 2 calculated diagram(s): 300–1477.83 K, x(Sm) 0.25–0.25
Literature: 12 values (12 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sm:co3sm
paper: paper:10.1016/j.calphad.2011.06.001:SmCo3, paper:10.1016/s0925-8388(97)00540-9:Co3Sm
tdb: tdb:CoSm-11Yua.tdb:CO3SM, tdb:CoSm-98Su.tdb:CO3SM

TDB models of CO3SM (2): PHASE and CONSTITUENT statements as written

CoSm-11Yua.tdb: CO3SM, type code %A, sha256 2d48fb36760f4615…

74: PHASE CO3SM %A 2 0.75 0.25 !
75: CONST CO3SM : CO : SM : !

CoSm-98Su.tdb: CO3SM, type code %A, sha256 f5878d03ef199ecd…

73: PHASE CO3SM %A 2 3 1 !
74: CONST CO3SM : CO : SM : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
cited as the source of values for this phase

CO4SM9 (Co–Sm)

Id: phase:co-sm:co4sm9; status needs_review
No structure assigned. Why: assessment_declared_compound_differs_from_model_composition; no_on_hull_entry_in_both; no_structure_token
Candidate (literature_printed): Mn5C2 · mC28 — printed with a label mapped to this phase
Candidate (sgte_mmc2): Mn5C2 · mC28 · C2/c (15) — Hallstedt 2025 mmc2 row for CO4SM9: Co2Sm5
Candidate (tdb_comment): Mn5C2 · mC28 · C2/c — CoSm-98Su.tdb: 'Prototype Mn5C2 (mC28, C2/c)'
Stoichiometry: Co 0.3077, Sm 0.6923
Stability: stable in 1 of 1 calculated diagram(s): 300–884.47 K, x(Sm) 0.69231–0.69231
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:co-sm:co4sm9
paper: paper:10.1016/s0925-8388(97)00540-9:Co4Sm9
tdb: tdb:CoSm-98Su.tdb:CO4SM9

TDB models of CO4SM9 (1): PHASE and CONSTITUENT statements as written

CoSm-98Su.tdb: CO4SM9, type code %, sha256 f5878d03ef199ecd…

83: PHASE CO4SM9 % 2 4 9 !
84: CONST CO4SM9 : CO : SM : !

Example references (3 of 3; assessments first):

doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
cited as the source of values for this phase

CO5SM (Co–Sm)

Id: phase:co-sm:co5sm; status assigned
Structure: Cu7Tb · hP8 · P6/mmm (191); type st:cu7tb-hp8; 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_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): 1085.25–1593.2 K, x(Sm) 0.14742–0.17864
Literature: 14 values (14 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sm:co5sm
paper: paper:10.1016/j.calphad.2011.06.001:SmCo5, paper:10.1016/s0925-8388(97)00540-9:Co5Sm
tdb: tdb:CoSm-11Yua.tdb:CO5SM, tdb:CoSm-98Su.tdb:CO5SM

TDB models of CO5SM (2): PHASE and CONSTITUENT statements as written

CoSm-11Yua.tdb: CO5SM, type code %A, sha256 2d48fb36760f4615…

57: PHASE CO5SM %A 2 0.833333 0.166667 !
58: CONST CO5SM : CO VA : CO2 SM : !

CoSm-98Su.tdb: CO5SM, type code %A, sha256 f5878d03ef199ecd…

56: PHASE CO5SM %A 2 5 1 !
57: CONST CO5SM : CO : SM : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase; reports values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
cited as the source of values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase

CO7SM2 (Co–Sm)

Id: phase:co-sm:co7sm2; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_rows_disagree
Candidate (literature_printed): Ce2Ni7 · hP36 — printed with a label mapped to this phase
Candidate (sgte_mmc2): Ce2Ni7 · hP36 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for CO7SM2: Co7Sm2 (high T), see also Co7Gd2
Candidate (sgte_mmc2): Co7Gd2 · hR18 · R-3m (166) — Hallstedt 2025 mmc2 row for CO7SM2: Co7Sm2 (low T), see also Ce2Ni7
Candidate (tdb_comment): Ce2Ni7 · hP36 · P6_3/mmc — CoSm-11Yua.tdb: 'Prototype Ce2Ni7 (hP36, P6_3/mmc); high T'
Candidate (tdb_comment): Co7Gd2 · hR18 · R-3m — CoSm-11Yua.tdb: 'Prototype Co7Gd2 (hR18, R-3m); low T'
Candidate (tdb_comment): Ce2Ni7 · hP36 · P6_3/mmc — CoSm-98Su.tdb: 'Prototype Ce2Ni7 (hP36, P6_3/mmc); high T'
Candidate (tdb_comment): Co7Gd2 · hR18 · R-3m — CoSm-98Su.tdb: 'Prototype Co7Gd2 (hR18, R-3m); low T'
Stoichiometry: Co 0.7778, Sm 0.2222
Stability: stable in 2 of 2 calculated diagram(s): 300–1517.44 K, x(Sm) 0.22222–0.22222
Literature: 12 values (12 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sm:co7sm2
paper: paper:10.1016/j.calphad.2011.06.001:Sm2Co7, paper:10.1016/s0925-8388(97)00540-9:Co7Sm2
tdb: tdb:CoSm-11Yua.tdb:CO7SM2, tdb:CoSm-98Su.tdb:CO7SM2

TDB models of CO7SM2 (2): PHASE and CONSTITUENT statements as written

CoSm-11Yua.tdb: CO7SM2, type code %A, sha256 2d48fb36760f4615…

69: PHASE CO7SM2 %A 2 0.777778 0.222222 !
70: CONST CO7SM2 : CO : SM : !

CoSm-98Su.tdb: CO7SM2, type code %A, sha256 f5878d03ef199ecd…

68: PHASE CO7SM2 %A 2 7 2 !
69: CONST CO7SM2 : CO : SM : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
cited as the source of values for this phase

COSM3_D011 (Co–Sm)

Id: phase:co-sm:cosm3-d011; status assigned
Structure: Fe3C · D0_11 · oP16 · Pnma (62); type st:d0-11-fe3c-op16; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacduvg and oqmd-663938, space group 62
Stoichiometry: Co 0.2500, Sm 0.7500
Stability: stable in 2 of 2 calculated diagram(s): 300–977.48 K, x(Sm) 0.75–0.75
Literature: 23 values (23 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:co-sm:cosm3-d011
mp: mp:mp-aaacduvg
oqmd: oqmd:oqmd-663938
paper: paper:10.1016/j.calphad.2011.06.001:Sm3Co, paper:10.1016/s0925-8388(97)00540-9:CoSm3
tdb: tdb:CoSm-11Yua.tdb:COSM3_D011, tdb:CoSm-98Su.tdb:COSM3_D011

TDB models of COSM3_D011 (2): PHASE and CONSTITUENT statements as written

CoSm-11Yua.tdb: COSM3_D011, type code %, sha256 2d48fb36760f4615…

89: PHASE COSM3_D011 % 2 0.25 0.75 !
90: CONST COSM3_D011 : CO : SM : !

CoSm-98Su.tdb: COSM3_D011, type code %, sha256 f5878d03ef199ecd…

88: PHASE COSM3_D011 % 2 1 3 !
89: CONST COSM3_D011 : CO : SM : !

Example references (5 of 5; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase
doi:10.1016/j.jallcom.2010.08.035 Y. Yuan, S. Delsante, J. Yi, G. Borzone, A revision of the Sm-rich region of the Sm–Co system, Journal of Alloys and Compounds 508, 309-314 (2010).
cited as the source of values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
cited as the source of values for this phase

FCC_A1 (Co–Sm)

Id: phase:co-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): 694.99–1777.38 K, x(Sm) 0–0.00326
Literature: 6 values (6 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sm:fcc-a1
paper: paper:10.1016/j.calphad.2011.06.001:α(Co), paper:10.1016/s0925-8388(97)00540-9:α-Co(fcc)
tdb: tdb:CoSm-11Yua.tdb:FCC_A1, tdb:CoSm-98Su.tdb:FCC_A1

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

CoSm-11Yua.tdb: FCC_A1, type code %A, sha256 2d48fb36760f4615…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : CO% SM : VA : !

CoSm-98Su.tdb: FCC_A1, type code %A, sha256 f5878d03ef199ecd…

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

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
cited as the source of values for this phase

HCP_A3 (Co–Sm)

Id: phase:co-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): 300–1340 K, x(Sm) 0–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:co-sm:hcp-a3
paper: paper:10.1016/j.calphad.2011.06.001:β(Sm)
tdb: tdb:CoSm-11Yua.tdb:HCP_A3, tdb:CoSm-98Su.tdb:HCP_A3

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

CoSm-11Yua.tdb: HCP_A3, type code %A, sha256 2d48fb36760f4615…

42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : CO% SM : VA : !

CoSm-98Su.tdb: HCP_A3, type code %A, sha256 f5878d03ef199ecd…

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

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase
doi:10.1016/j.jallcom.2010.08.035 Y. Yuan, S. Delsante, J. Yi, G. Borzone, A revision of the Sm-rich region of the Sm–Co system, Journal of Alloys and Compounds 508, 309-314 (2010).
cited as the source of values for this phase

LIQUID (Co–Sm)

Id: phase:co-sm:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 865.4–2500 K, x(Sm) 0–1
Literature: 68 values (67 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:co-sm:liquid
paper: paper:10.1016/j.calphad.2011.06.001:L, paper:10.1016/j.calphad.2011.06.001:liquid, paper:10.1016/s0925-8388(97)00540-9:L
tdb: tdb:CoSm-11Yua.tdb:LIQUID, tdb:CoSm-98Su.tdb:LIQUID

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

CoSm-11Yua.tdb: LIQUID, type code %, sha256 2d48fb36760f4615…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : CO SM : !

CoSm-98Su.tdb: LIQUID, type code %, sha256 f5878d03ef199ecd…

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

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase; reports values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
cited as the source of values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase
doi:10.1016/j.jallcom.2010.08.035 Y. Yuan, S. Delsante, J. Yi, G. Borzone, A revision of the Sm-rich region of the Sm–Co system, Journal of Alloys and Compounds 508, 309-314 (2010).
cited as the source of values for this phase
doi:10.1016/s0925-8388(02)00523-6 N.I. Usenko, M.I. Ivanov, V.V. Berezutski, Mixing enthalpies of liquid Co–Ce and Co–Sm alloys, Journal of Alloys and Compounds 346, L7-L10 (2002).
cited as the source of values for this phase

RHOMB_C19 (Co–Sm)

Id: phase:co-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): 300–1193.85 K, x(Sm) 0.99702–1
Literature: 5 values (5 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sm:rhomb-c19
paper: paper:10.1016/j.calphad.2011.06.001:α(Sm), paper:10.1016/s0925-8388(97)00540-9:α-Sm(r hom)
tdb: tdb:CoSm-11Yua.tdb:RHOMB_C19, tdb:CoSm-98Su.tdb:RHOMB_C19

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

CoSm-11Yua.tdb: RHOMB_C19, type code %, sha256 2d48fb36760f4615…

47: PHASE RHOMB_C19 % 1 1 !
48: CONST RHOMB_C19 : CO SM% : !

CoSm-98Su.tdb: RHOMB_C19, type code %, sha256 f5878d03ef199ecd…

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

Example references (5 of 5; assessments first):

doi:10.1016/S0925-8388(97)00540-9 X. Su, W. Zhang, G. Liu, Z. Du, J. Alloys Compd., 267, 149-53(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2011.06.001 Yuan Yuan, Jianhong Yi, Gabriella Borzone, Andy Watson, Thermodynamic modeling of the Co–Sm system, Calphad 35, 416-420 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(68)90037-4 K.H.J. Buschow, A.S. Van Der Goot, Intermetallic compounds in the system samarium-cobalt, Journal of the Less Common Metals 14, 323-328 (1968).
cited as the source of values for this phase
doi:10.1016/j.jallcom.2010.08.035 Y. Yuan, S. Delsante, J. Yi, G. Borzone, A revision of the Sm-rich region of the Sm–Co system, Journal of Alloys and Compounds 508, 309-314 (2010).
cited as the source of values for this phase
doi:10.1515/ijmr-1993-840306 Wei Qin Ge, Chang Heng Wu, Yu Chih Chuang, Reinvestigation of the Sm - Co Binary System, International Journal of Materials Research 84, 165-169 (1993).
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}
}