Co–Sn phases

13 phases (tier A 7, tier C 4, liquid 1, needs_review 1); 11 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–Sn system page · Markdown · field reference

Phases of the Co–Sn system (13)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
DIAMOND_A4 phase:co-sn:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	not stable in 4 calculated diagram(s)	0	4
BCT_A5 phase:co-sn:a5-bct	beta-Sn · A5 · tI4 · I4_1/amd (141)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–505.08 K, x(Sn) 1–1	7	4
BCC_A2 phase:co-sn:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 4 calculated diagram(s)	0	4
CO3SN2_ALPHA phase:co-sn:co3sn2-alpha	Ni3Sn2 · oP20 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–847.44 K, x(Sn) 0.4–0.4	9	2
CO3SN2_B82 phase:co-sn:co3sn2-b82		needs_review	stable in 4 of 4 calculated diagram(s): 300–1472.42 K, x(Sn) 0.38645–0.41738	42	4
COSN_B35 phase:co-sn:cosn-b35	CoSn · B35 · hP6 · P6/mmm (191)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–1240.16 K, x(Sn) 0.5–0.5	24	4
COSN2_C16 phase:co-sn:cosn2-c16	Al2Cu · C16 · tI12 · I4/mcm (140)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–848.39 K, x(Sn) 0.66667–0.66667	21	4
COSN3 phase:co-sn:cosn3	PdSn3 · oC32 · Cmce (64)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–623.87 K, x(Sn) 0.75–0.75	7	2
COSN3_HT phase:co-sn:cosn3-ht	CoSn3 · tI64 · I4_1/acd (142)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 547.79–650 K, x(Sn) 0.75–0.75	2	1
COSN3_LT phase:co-sn:cosn3-lt	PdSn3 · oC32 · Cmce (64)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–547.79 K, x(Sn) 0.75–0.75	0	1
FCC_A1 phase:co-sn:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 370–1775.94 K, x(Sn) 0–0.02715	18	4
HCP_A3 phase:co-sn:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–696.99 K, x(Sn) 0–0.00061	5	4
LIQUID phase:co-sn:liquid	liquid	liquid	stable in 4 of 4 calculated diagram(s): 501.01–2500 K, x(Sn) 0–1	54	4

DIAMOND_A4 (Co–Sn)

Id: phase:co-sn:a4-diamond; status assigned
Structure: C (diamond) · A4 · cF8 · Fd-3m (227); type st:a4-c-diamond-cf8; tier A: standard phase name; confidence high
Stoichiometry: Sn 1.0000
Stability: not stable in 4 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sn:a4-diamond
tdb: tdb:CoSn-04Jia.tdb:DIAMOND_A4, tdb:CoSn-04Liu.tdb:DIAMOND_A4, tdb:CoSn-09Don.tdb:DIAMOND_A4, tdb:CoSn-19Jed.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (4): PHASE and CONSTITUENT statements as written

CoSn-04Jia.tdb: DIAMOND_A4, type code %, sha256 a10dd23f7f82a2c4…

50: PHASE DIAMOND_A4 % 1 1 !
51: CONST DIAMOND_A4 : SN : !

CoSn-04Liu.tdb: DIAMOND_A4, type code %, sha256 61b66e699771d1e4…

43: PHASE DIAMOND_A4 % 1 1 !
44: CONST DIAMOND_A4 : SN : !

CoSn-09Don.tdb: DIAMOND_A4, type code %, sha256 df75c146f15affde…

51: PHASE DIAMOND_A4 % 1 1 !
52: CONST DIAMOND_A4 : SN : !

CoSn-19Jed.tdb: DIAMOND_A4, type code %, sha256 a1f1c360881522fd…

40: PHASE DIAMOND_A4 % 1 1 !
41: CONST DIAMOND_A4 : SN : !

Example references (4 of 4; assessments first):

doi:10.1007/s11664-004-0019-8 Libin Liu, Cristina Andersson, Johan Liu, Thermodynamic assessment of the Sn-Co lead-free solder system, Journal of Elec Materi 33, 935-939 (2004).
assessment that models this phase
doi:10.1007/s11664-009-0874-4 H. Q. Dong, S. Jin, L. G. Zhang, J. S. Wang, X. M. Tao, H. S. Liu et al., Thermodynamic Assessment of the Au-Co-Sn Ternary System, Journal of Elec Materi 38, 2158-2169 (2009).
assessment that models this phase
doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase
doi:10.1016/j.calphad.2004.08.001 M. Jiang, J. Sato, I. Ohnuma, R. Kainuma, K. Ishida, A thermodynamic assessment of the Co–Sn system, Calphad 28, 213-220 (2004).
assessment that models this phase

BCT_A5 (Co–Sn)

Id: phase:co-sn:a5-bct; status assigned
Structure: beta-Sn · A5 · tI4 · I4_1/amd (141); type st:a5-beta-sn-ti4; tier A: standard phase name; confidence high
Stoichiometry: Sn 1.0000
Stability: stable in 4 of 4 calculated diagram(s): 300–505.08 K, x(Sn) 1–1
Literature: 7 values (7 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:co-sn:a5-bct, corpus:phase:co-sn:bct-a5
paper: paper:10.1007/s11664-004-0019-8:(Sn), paper:10.1016/j.calphad.2004.08.001:(βSn)
tdb: tdb:CoSn-04Jia.tdb:BCT_A5, tdb:CoSn-04Liu.tdb:BCT_A5, tdb:CoSn-09Don.tdb:BCT_A5, tdb:CoSn-19Jed.tdb:BCT_A5

TDB models of BCT_A5 (4): PHASE and CONSTITUENT statements as written

CoSn-04Jia.tdb: BCT_A5, type code %, sha256 a10dd23f7f82a2c4…

55: PHASE BCT_A5 % 1 1 !
56: CONST BCT_A5 : SN : !

CoSn-04Liu.tdb: BCT_A5, type code %, sha256 61b66e699771d1e4…

48: PHASE BCT_A5 % 1 1 !
49: CONST BCT_A5 : SN : !

CoSn-09Don.tdb: BCT_A5, type code %, sha256 df75c146f15affde…

56: PHASE BCT_A5 % 1 1 !
57: CONST BCT_A5 : SN : !

CoSn-19Jed.tdb: BCT_A5, type code %, sha256 a1f1c360881522fd…

45: PHASE BCT_A5 % 1 1 !
46: CONST BCT_A5 : SN : !

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2004.08.001 M. Jiang, J. Sato, I. Ohnuma, R. Kainuma, K. Ishida, A thermodynamic assessment of the Co–Sn system, Calphad 28, 213-220 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-004-0019-8 Libin Liu, Cristina Andersson, Johan Liu, Thermodynamic assessment of the Sn-Co lead-free solder system, Journal of Elec Materi 33, 935-939 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-009-0874-4 H. Q. Dong, S. Jin, L. G. Zhang, J. S. Wang, X. M. Tao, H. S. Liu et al., Thermodynamic Assessment of the Au-Co-Sn Ternary System, Journal of Elec Materi 38, 2158-2169 (2009).
assessment that models this phase
doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase
doi:10.1007/bf02663681 K Ishida, T Nishizawa, The Co-Sn (Cobalt-Tin) System, JPE 12, 88-93 (1991).
cited as the source of values for this phase
doi:10.1002/zaac.19080590133 S. F. Żemcżużny, S. W. Belynsky, Kobalt‐Zinnlegierungen, Z. Anorg. Chem. 59, 364-370 (1908).
cited as the source of values for this phase

BCC_A2 (Co–Sn)

Id: phase:co-sn: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 4 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sn:bcc-a2
tdb: tdb:CoSn-04Jia.tdb:BCC_A2, tdb:CoSn-04Liu.tdb:BCC_A2, tdb:CoSn-09Don.tdb:BCC_A2, tdb:CoSn-19Jed.tdb:BCC_A2

TDB models of BCC_A2 (4): PHASE and CONSTITUENT statements as written

CoSn-04Jia.tdb: BCC_A2, type code %B, sha256 a10dd23f7f82a2c4…

40: PHASE BCC_A2 %B 2 1 3 !
41: CONST BCC_A2 : CO SN : VA : !

CoSn-04Liu.tdb: BCC_A2, type code %B, sha256 61b66e699771d1e4…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : CO SN : VA : !

CoSn-09Don.tdb: BCC_A2, type code %B, sha256 df75c146f15affde…

41: PHASE BCC_A2 %B 2 1 3 !
42: CONST BCC_A2 : CO SN : VA : !

CoSn-19Jed.tdb: BCC_A2, type code %B, sha256 a1f1c360881522fd…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : CO SN : VA : !

Example references (4 of 4; assessments first):

doi:10.1007/s11664-004-0019-8 Libin Liu, Cristina Andersson, Johan Liu, Thermodynamic assessment of the Sn-Co lead-free solder system, Journal of Elec Materi 33, 935-939 (2004).
assessment that models this phase
doi:10.1007/s11664-009-0874-4 H. Q. Dong, S. Jin, L. G. Zhang, J. S. Wang, X. M. Tao, H. S. Liu et al., Thermodynamic Assessment of the Au-Co-Sn Ternary System, Journal of Elec Materi 38, 2158-2169 (2009).
assessment that models this phase
doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase
doi:10.1016/j.calphad.2004.08.001 M. Jiang, J. Sato, I. Ohnuma, R. Kainuma, K. Ishida, A thermodynamic assessment of the Co–Sn system, Calphad 28, 213-220 (2004).
assessment that models this phase

CO3SN2_ALPHA (Co–Sn)

Id: phase:co-sn:co3sn2-alpha; status assigned
Structure: Ni3Sn2 · oP20 · Pnma (62); type st:ni3sn2-op20; 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, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Co 0.6000, Sn 0.4000
Stability: stable in 2 of 2 calculated diagram(s): 300–847.44 K, x(Sn) 0.4–0.4
Literature: 9 values (9 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sn:co3sn2-alpha
paper: paper:10.1007/s11664-004-0019-8:Co3Sn2_alfa, paper:10.1007/s11669-018-0687-3:α-Co3Sn2
tdb: tdb:CoSn-04Liu.tdb:CO3SN2_ALPHA, tdb:CoSn-19Jed.tdb:CO3SN2_ALPHA

TDB models of CO3SN2_ALPHA (2): PHASE and CONSTITUENT statements as written

CoSn-04Liu.tdb: CO3SN2_ALPHA, type code %, sha256 61b66e699771d1e4…

53: PHASE CO3SN2_ALPHA % 2 3 2 !
54: CONST CO3SN2_ALPHA : CO : SN : !

CoSn-19Jed.tdb: CO3SN2_ALPHA, type code %, sha256 a1f1c360881522fd…

50: PHASE CO3SN2_ALPHA % 2 3 2 !
51: CONST CO3SN2_ALPHA : CO : SN : !

Example references (3 of 3; assessments first):

doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-004-0019-8 Libin Liu, Cristina Andersson, Johan Liu, Thermodynamic assessment of the Sn-Co lead-free solder system, Journal of Elec Materi 33, 935-939 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02663681 K Ishida, T Nishizawa, The Co-Sn (Cobalt-Tin) System, JPE 12, 88-93 (1991).
cited as the source of values for this phase

CO3SN2_B82 (Co–Sn)

Id: phase:co-sn:co3sn2-b82; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_B8_2; stoichiometry_contradicts_B8_2:CoSn-04Liu.tdb
Candidate (literature_printed): InNi2 · hP6 — printed with a label mapped to this phase
Candidate (name_token): InNi2 · B8_2 · hP6 · P6_3/mmc (194) — Strukturbericht/word 'B82' in the TDB name
Candidate (sgte_mmc2): InNi2 · B8_2 · hP6 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for CO3SN2_B82: Co3Sn2
Candidate (sgte_mmc2): InNi2 · B8_2 · hP6 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for CO3SN2_B82: Co3Sn2 (high T)
Candidate (tdb_comment): InNi2 · hP6 · P6_3/mmc, B8_2 — CoSn-04Jia.tdb: 'Prototype InNi2 (hP6, P6_3/mmc, B8_2), beta'
Candidate (tdb_comment): InNi2 · hP6 · P6_3/mmc — CoSn-04Liu.tdb: 'Prototype InNi2 (hP6, P6_3/mmc), beta'
Candidate (tdb_comment): InNi2 · hP6 · P6_3/mmc, B8_2 — CoSn-09Don.tdb: 'Prototype InNi2 (hP6, P6_3/mmc, B8_2), beta'
Candidate (tdb_comment): InNi2 · hP6 · P6_3/mmc — CoSn-19Jed.tdb: 'Prototype InNi2 (hP6, P6_3/mmc), beta'
Stability: stable in 4 of 4 calculated diagram(s): 300–1472.42 K, x(Sn) 0.38645–0.41738
Literature: 42 values (42 accepted) from 3 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:co-sn:co3sn2-b82
paper: paper:10.1007/s11664-004-0019-8:Co3Sn2_beta, paper:10.1007/s11669-018-0687-3:β-Co3Sn2, paper:10.1016/j.calphad.2004.08.001:αCo3Sn2, paper:10.1016/j.calphad.2004.08.001:βCo3Sn2
tdb: tdb:CoSn-04Jia.tdb:CO3SN2_B82, tdb:CoSn-04Liu.tdb:CO3SN2_B82, tdb:CoSn-09Don.tdb:CO3SN2_B82, tdb:CoSn-19Jed.tdb:CO3SN2_B82

TDB models of CO3SN2_B82 (4): PHASE and CONSTITUENT statements as written

CoSn-04Jia.tdb: CO3SN2_B82, type code %, sha256 a10dd23f7f82a2c4…

62: PHASE CO3SN2_B82 % 4 1 1 0.5 0.5 !
63: CONST CO3SN2_B82 : CO : SN : CO VA : CO VA : !

CoSn-04Liu.tdb: CO3SN2_B82, type code %, sha256 61b66e699771d1e4…

58: PHASE CO3SN2_B82 % 2 3 2 !
59: CONST CO3SN2_B82 : CO : SN : !

CoSn-09Don.tdb: CO3SN2_B82, type code %, sha256 df75c146f15affde…

63: PHASE CO3SN2_B82 % 4 1 1 0.5 0.5 !
64: CONST CO3SN2_B82 : CO : SN : CO VA : CO VA : !

CoSn-19Jed.tdb: CO3SN2_B82, type code %, sha256 a1f1c360881522fd…

55: PHASE CO3SN2_B82 % 3 1 1 1 !
56: CONST CO3SN2_B82 : CO VA : CO VA : SN : !

Example references (7 of 7; assessments first):

doi:10.1016/j.calphad.2004.08.001 M. Jiang, J. Sato, I. Ohnuma, R. Kainuma, K. Ishida, A thermodynamic assessment of the Co–Sn system, Calphad 28, 213-220 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-004-0019-8 Libin Liu, Cristina Andersson, Johan Liu, Thermodynamic assessment of the Sn-Co lead-free solder system, Journal of Elec Materi 33, 935-939 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-009-0874-4 H. Q. Dong, S. Jin, L. G. Zhang, J. S. Wang, X. M. Tao, H. S. Liu et al., Thermodynamic Assessment of the Au-Co-Sn Ternary System, Journal of Elec Materi 38, 2158-2169 (2009).
assessment that models this phase
doi:10.1007/bf02663681 K Ishida, T Nishizawa, The Co-Sn (Cobalt-Tin) System, JPE 12, 88-93 (1991).
cited as the source of values for this phase
doi:10.1007/bf02658043 H. Cömert, J. N. Pratt, Constitutional studies of cobalt-tin alloys, Metall Trans A 23, 2401-2407 (1992).
cited as the source of values for this phase
doi:10.1002/zaac.19080590133 S. F. Żemcżużny, S. W. Belynsky, Kobalt‐Zinnlegierungen, Z. Anorg. Chem. 59, 364-370 (1908).
cited as the source of values for this phase

COSN_B35 (Co–Sn)

Id: phase:co-sn:cosn-b35; status assigned
Structure: CoSn · B35 · hP6 · P6/mmm (191); type st:b35-cosn-hp6; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaabejw and oqmd-9977, space group 191
Stoichiometry: Co 0.5000, Sn 0.5000
Stability: stable in 4 of 4 calculated diagram(s): 300–1240.16 K, x(Sn) 0.5–0.5
Literature: 24 values (24 accepted) from 3 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:co-sn:cosn-b35
mp: mp:mp-aaaabejw
oqmd: oqmd:oqmd-9977
paper: paper:10.1007/s11664-004-0019-8:CoSn, paper:10.1007/s11669-018-0687-3:CoSn, paper:10.1016/j.calphad.2004.08.001:CoSn
tdb: tdb:CoSn-04Jia.tdb:COSN_B35, tdb:CoSn-04Liu.tdb:COSN_B35, tdb:CoSn-09Don.tdb:COSN_B35, tdb:CoSn-19Jed.tdb:COSN_B35

TDB models of COSN_B35 (4): PHASE and CONSTITUENT statements as written

CoSn-04Jia.tdb: COSN_B35, type code %, sha256 a10dd23f7f82a2c4…

67: PHASE COSN_B35 % 2 1 1 !
68: CONST COSN_B35 : CO : SN : !

CoSn-04Liu.tdb: COSN_B35, type code %, sha256 61b66e699771d1e4…

63: PHASE COSN_B35 % 2 1 1 !
64: CONST COSN_B35 : CO : SN : !

CoSn-09Don.tdb: COSN_B35, type code %, sha256 df75c146f15affde…

68: PHASE COSN_B35 % 2 1 1 !
69: CONST COSN_B35 : CO : SN : !

CoSn-19Jed.tdb: COSN_B35, type code %, sha256 a1f1c360881522fd…

60: PHASE COSN_B35 % 2 1 1 !
61: CONST COSN_B35 : CO : SN : !

Example references (7 of 7; assessments first):

doi:10.1016/j.calphad.2004.08.001 M. Jiang, J. Sato, I. Ohnuma, R. Kainuma, K. Ishida, A thermodynamic assessment of the Co–Sn system, Calphad 28, 213-220 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-004-0019-8 Libin Liu, Cristina Andersson, Johan Liu, Thermodynamic assessment of the Sn-Co lead-free solder system, Journal of Elec Materi 33, 935-939 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-009-0874-4 H. Q. Dong, S. Jin, L. G. Zhang, J. S. Wang, X. M. Tao, H. S. Liu et al., Thermodynamic Assessment of the Au-Co-Sn Ternary System, Journal of Elec Materi 38, 2158-2169 (2009).
assessment that models this phase
doi:10.1007/bf02663681 K Ishida, T Nishizawa, The Co-Sn (Cobalt-Tin) System, JPE 12, 88-93 (1991).
cited as the source of values for this phase
doi:10.1002/zaac.19080590133 S. F. Żemcżużny, S. W. Belynsky, Kobalt‐Zinnlegierungen, Z. Anorg. Chem. 59, 364-370 (1908).
cited as the source of values for this phase
doi:10.1007/bf02658043 H. Cömert, J. N. Pratt, Constitutional studies of cobalt-tin alloys, Metall Trans A 23, 2401-2407 (1992).
cited as the source of values for this phase

COSN2_C16 (Co–Sn)

Id: phase:co-sn:cosn2-c16; status assigned
Structure: Al2Cu · C16 · tI12 · I4/mcm (140); type st:c16-al2cu-ti12; tier A: standard phase name; confidence high
Stoichiometry: Co 0.3333, Sn 0.6667
Stability: stable in 4 of 4 calculated diagram(s): 300–848.39 K, x(Sn) 0.66667–0.66667
Literature: 21 values (21 accepted) from 3 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:co-sn:cosn2-c16
paper: paper:10.1007/s11664-004-0019-8:CoSn2, paper:10.1007/s11669-018-0687-3:CoSn2, paper:10.1016/j.calphad.2004.08.001:CoSn2
tdb: tdb:CoSn-04Jia.tdb:COSN2_C16, tdb:CoSn-04Liu.tdb:COSN2_C16, tdb:CoSn-09Don.tdb:COSN2_C16, tdb:CoSn-19Jed.tdb:COSN2_C16

TDB models of COSN2_C16 (4): PHASE and CONSTITUENT statements as written

CoSn-04Jia.tdb: COSN2_C16, type code %, sha256 a10dd23f7f82a2c4…

72: PHASE COSN2_C16 % 2 1 2 !
73: CONST COSN2_C16 : CO : SN : !

CoSn-04Liu.tdb: COSN2_C16, type code %, sha256 61b66e699771d1e4…

68: PHASE COSN2_C16 % 2 1 2 !
69: CONST COSN2_C16 : CO : SN : !

CoSn-09Don.tdb: COSN2_C16, type code %, sha256 df75c146f15affde…

73: PHASE COSN2_C16 % 2 1 2 !
74: CONST COSN2_C16 : CO : SN : !

CoSn-19Jed.tdb: COSN2_C16, type code %, sha256 a1f1c360881522fd…

65: PHASE COSN2_C16 % 2 1 2 !
66: CONST COSN2_C16 : CO : SN : !

Example references (7 of 7; assessments first):

doi:10.1016/j.calphad.2004.08.001 M. Jiang, J. Sato, I. Ohnuma, R. Kainuma, K. Ishida, A thermodynamic assessment of the Co–Sn system, Calphad 28, 213-220 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-004-0019-8 Libin Liu, Cristina Andersson, Johan Liu, Thermodynamic assessment of the Sn-Co lead-free solder system, Journal of Elec Materi 33, 935-939 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-009-0874-4 H. Q. Dong, S. Jin, L. G. Zhang, J. S. Wang, X. M. Tao, H. S. Liu et al., Thermodynamic Assessment of the Au-Co-Sn Ternary System, Journal of Elec Materi 38, 2158-2169 (2009).
assessment that models this phase
doi:10.1007/bf02663681 K Ishida, T Nishizawa, The Co-Sn (Cobalt-Tin) System, JPE 12, 88-93 (1991).
cited as the source of values for this phase
doi:10.1002/zaac.19080590133 S. F. Żemcżużny, S. W. Belynsky, Kobalt‐Zinnlegierungen, Z. Anorg. Chem. 59, 364-370 (1908).
cited as the source of values for this phase
doi:10.1007/bf02658043 H. Cömert, J. N. Pratt, Constitutional studies of cobalt-tin alloys, Metall Trans A 23, 2401-2407 (1992).
cited as the source of values for this phase

COSN3 (Co–Sn)

Id: phase:co-sn:cosn3; status assigned
Structure: PdSn3 · oC32 · Cmce (64); type st:pdsn3-oc32; 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, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Co 0.2500, Sn 0.7500
Stability: stable in 2 of 2 calculated diagram(s): 300–623.87 K, x(Sn) 0.75–0.75
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-sn:cosn3
paper: paper:10.1016/j.calphad.2004.08.001:αCoSn3, paper:10.1016/j.calphad.2004.08.001:βCoSn3
tdb: tdb:CoSn-04Jia.tdb:COSN3, tdb:CoSn-09Don.tdb:COSN3

TDB models of COSN3 (2): PHASE and CONSTITUENT statements as written

CoSn-04Jia.tdb: COSN3, type code %, sha256 a10dd23f7f82a2c4…

77: PHASE COSN3 % 2 1 3 !
78: CONST COSN3 : CO : SN : !

CoSn-09Don.tdb: COSN3, type code %, sha256 df75c146f15affde…

78: PHASE COSN3 % 2 1 3 !
79: CONST COSN3 : CO : SN : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2004.08.001 M. Jiang, J. Sato, I. Ohnuma, R. Kainuma, K. Ishida, A thermodynamic assessment of the Co–Sn system, Calphad 28, 213-220 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-009-0874-4 H. Q. Dong, S. Jin, L. G. Zhang, J. S. Wang, X. M. Tao, H. S. Liu et al., Thermodynamic Assessment of the Au-Co-Sn Ternary System, Journal of Elec Materi 38, 2158-2169 (2009).
assessment that models this phase
doi:10.1002/zaac.19080590133 S. F. Żemcżużny, S. W. Belynsky, Kobalt‐Zinnlegierungen, Z. Anorg. Chem. 59, 364-370 (1908).
cited as the source of values for this phase
doi:10.1007/bf02663681 K Ishida, T Nishizawa, The Co-Sn (Cobalt-Tin) System, JPE 12, 88-93 (1991).
cited as the source of values for this phase

COSN3_HT (Co–Sn)

Id: phase:co-sn:cosn3-ht; status assigned
Structure: CoSn3 · tI64 · I4_1/acd (142); type st:cosn3-ti64; 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, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Co 0.2500, Sn 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 547.79–650 K, x(Sn) 0.75–0.75
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:co-sn:cosn3-ht
paper: paper:10.1007/s11669-018-0687-3:β-CoSn3
tdb: tdb:CoSn-19Jed.tdb:COSN3_HT

TDB models of COSN3_HT (1): PHASE and CONSTITUENT statements as written

CoSn-19Jed.tdb: COSN3_HT, type code %, sha256 a1f1c360881522fd…

75: PHASE COSN3_HT % 2 1 3 !
76: CONST COSN3_HT : CO : SN : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase; reports values for this phase

COSN3_LT (Co–Sn)

Id: phase:co-sn:cosn3-lt; status assigned
Structure: PdSn3 · oC32 · Cmce (64); type st:pdsn3-oc32; 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, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Co 0.2500, Sn 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–547.79 K, x(Sn) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-sn:cosn3-lt
tdb: tdb:CoSn-19Jed.tdb:COSN3_LT

TDB models of COSN3_LT (1): PHASE and CONSTITUENT statements as written

CoSn-19Jed.tdb: COSN3_LT, type code %, sha256 a1f1c360881522fd…

70: PHASE COSN3_LT % 2 1 3 !
71: CONST COSN3_LT : CO : SN : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase

FCC_A1 (Co–Sn)

Id: phase:co-sn: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 4 of 4 calculated diagram(s): 370–1775.94 K, x(Sn) 0–0.02715
Literature: 18 values (18 accepted) from 3 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:co-sn:fcc-a1
paper: paper:10.1007/s11664-004-0019-8:FCC, paper:10.1007/s11669-018-0687-3:(α-Co), paper:10.1016/j.calphad.2004.08.001:(αCo)
tdb: tdb:CoSn-04Jia.tdb:FCC_A1, tdb:CoSn-04Liu.tdb:FCC_A1, tdb:CoSn-09Don.tdb:FCC_A1, tdb:CoSn-19Jed.tdb:FCC_A1

TDB models of FCC_A1 (4): PHASE and CONSTITUENT statements as written

CoSn-04Jia.tdb: FCC_A1, type code %A, sha256 a10dd23f7f82a2c4…

35: PHASE FCC_A1 %A 2 1 1 !
36: CONST FCC_A1 : CO% SN : VA : !

CoSn-04Liu.tdb: FCC_A1, type code %A, sha256 61b66e699771d1e4…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : CO% SN : VA : !

CoSn-09Don.tdb: FCC_A1, type code %A, sha256 df75c146f15affde…

36: PHASE FCC_A1 %A 2 1 1 !
37: CONST FCC_A1 : CO% SN : VA : !

CoSn-19Jed.tdb: FCC_A1, type code %A, sha256 a1f1c360881522fd…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : CO% SN : VA : !

Example references (7 of 7; assessments first):

doi:10.1016/j.calphad.2004.08.001 M. Jiang, J. Sato, I. Ohnuma, R. Kainuma, K. Ishida, A thermodynamic assessment of the Co–Sn system, Calphad 28, 213-220 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-004-0019-8 Libin Liu, Cristina Andersson, Johan Liu, Thermodynamic assessment of the Sn-Co lead-free solder system, Journal of Elec Materi 33, 935-939 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-009-0874-4 H. Q. Dong, S. Jin, L. G. Zhang, J. S. Wang, X. M. Tao, H. S. Liu et al., Thermodynamic Assessment of the Au-Co-Sn Ternary System, Journal of Elec Materi 38, 2158-2169 (2009).
assessment that models this phase
doi:10.1007/bf02663681 K Ishida, T Nishizawa, The Co-Sn (Cobalt-Tin) System, JPE 12, 88-93 (1991).
cited as the source of values for this phase
doi:10.1007/bf02658043 H. Cömert, J. N. Pratt, Constitutional studies of cobalt-tin alloys, Metall Trans A 23, 2401-2407 (1992).
cited as the source of values for this phase
doi:10.1002/zaac.19080590133 S. F. Żemcżużny, S. W. Belynsky, Kobalt‐Zinnlegierungen, Z. Anorg. Chem. 59, 364-370 (1908).
cited as the source of values for this phase

HCP_A3 (Co–Sn)

Id: phase:co-sn: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 4 of 4 calculated diagram(s): 300–696.99 K, x(Sn) 0–0.00061
Literature: 5 values (5 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:co-sn:hcp-a3
paper: paper:10.1007/s11669-018-0687-3:(ε-Co), paper:10.1016/j.calphad.2004.08.001:(εCo)
tdb: tdb:CoSn-04Jia.tdb:HCP_A3, tdb:CoSn-04Liu.tdb:HCP_A3, tdb:CoSn-09Don.tdb:HCP_A3, tdb:CoSn-19Jed.tdb:HCP_A3

TDB models of HCP_A3 (4): PHASE and CONSTITUENT statements as written

CoSn-04Jia.tdb: HCP_A3, type code %A, sha256 a10dd23f7f82a2c4…

45: PHASE HCP_A3 %A 2 1 0.5 !
46: CONST HCP_A3 : CO% SN : VA : !

CoSn-04Liu.tdb: HCP_A3, type code %A, sha256 61b66e699771d1e4…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : CO% SN : VA : !

CoSn-09Don.tdb: HCP_A3, type code %A, sha256 df75c146f15affde…

46: PHASE HCP_A3 %A 2 1 0.5 !
47: CONST HCP_A3 : CO% SN : VA : !

CoSn-19Jed.tdb: HCP_A3, type code %A, sha256 a1f1c360881522fd…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : CO% SN : VA : !

Example references (6 of 6; assessments first):

doi:10.1016/j.calphad.2004.08.001 M. Jiang, J. Sato, I. Ohnuma, R. Kainuma, K. Ishida, A thermodynamic assessment of the Co–Sn system, Calphad 28, 213-220 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-004-0019-8 Libin Liu, Cristina Andersson, Johan Liu, Thermodynamic assessment of the Sn-Co lead-free solder system, Journal of Elec Materi 33, 935-939 (2004).
assessment that models this phase
doi:10.1007/s11664-009-0874-4 H. Q. Dong, S. Jin, L. G. Zhang, J. S. Wang, X. M. Tao, H. S. Liu et al., Thermodynamic Assessment of the Au-Co-Sn Ternary System, Journal of Elec Materi 38, 2158-2169 (2009).
assessment that models this phase
doi:10.1007/bf02658043 H. Cömert, J. N. Pratt, Constitutional studies of cobalt-tin alloys, Metall Trans A 23, 2401-2407 (1992).
cited as the source of values for this phase
doi:10.1007/bf02663681 K Ishida, T Nishizawa, The Co-Sn (Cobalt-Tin) System, JPE 12, 88-93 (1991).
cited as the source of values for this phase

LIQUID (Co–Sn)

Id: phase:co-sn:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 4 of 4 calculated diagram(s): 501.01–2500 K, x(Sn) 0–1
Literature: 54 values (54 accepted) from 3 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:co-sn:liquid
paper: paper:10.1007/s11664-004-0019-8:L, paper:10.1007/s11669-018-0687-3:L, paper:10.1016/j.calphad.2004.08.001:L
tdb: tdb:CoSn-04Jia.tdb:LIQUID, tdb:CoSn-04Liu.tdb:LIQUID, tdb:CoSn-09Don.tdb:LIQUID, tdb:CoSn-19Jed.tdb:LIQUID

TDB models of LIQUID (4): PHASE and CONSTITUENT statements as written

CoSn-04Jia.tdb: LIQUID, type code %, sha256 a10dd23f7f82a2c4…

30: PHASE LIQUID:L % 1 1 !
31: CONST LIQUID:L : CO SN : !

CoSn-04Liu.tdb: LIQUID, type code %, sha256 61b66e699771d1e4…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : CO SN : !

CoSn-09Don.tdb: LIQUID, type code %, sha256 df75c146f15affde…

31: PHASE LIQUID:L % 1 1 !
32: CONST LIQUID:L : CO SN : !

CoSn-19Jed.tdb: LIQUID, type code %, sha256 a1f1c360881522fd…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : CO SN : !

Example references (7 of 7; assessments first):

doi:10.1016/j.calphad.2004.08.001 M. Jiang, J. Sato, I. Ohnuma, R. Kainuma, K. Ishida, A thermodynamic assessment of the Co–Sn system, Calphad 28, 213-220 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-004-0019-8 Libin Liu, Cristina Andersson, Johan Liu, Thermodynamic assessment of the Sn-Co lead-free solder system, Journal of Elec Materi 33, 935-939 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11669-018-0687-3 V. Jedličková, A. Zemanová, A. Kroupa, The Thermodynamic Assessment of the Co-Sn System, J. Phase Equilib. Diffus. 40, 21-33 (2019).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-009-0874-4 H. Q. Dong, S. Jin, L. G. Zhang, J. S. Wang, X. M. Tao, H. S. Liu et al., Thermodynamic Assessment of the Au-Co-Sn Ternary System, Journal of Elec Materi 38, 2158-2169 (2009).
assessment that models this phase
doi:10.1007/bf02663681 K Ishida, T Nishizawa, The Co-Sn (Cobalt-Tin) System, JPE 12, 88-93 (1991).
cited as the source of values for this phase
doi:10.1002/zaac.19080590133 S. F. Żemcżużny, S. W. Belynsky, Kobalt‐Zinnlegierungen, Z. Anorg. Chem. 59, 364-370 (1908).
cited as the source of values for this phase
doi:10.1007/bf02658043 H. Cömert, J. N. Pratt, Constitutional studies of cobalt-tin alloys, Metall Trans A 23, 2401-2407 (1992).
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}
}