Hg–Sn phases

8 phases (tier A 3, tier C 1, liquid 1, needs_review 3); 5 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: interactive registry · full JSON · Hg–Sn system page · Markdown · field reference

Phases of the Hg–Sn system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
RHOMBO_A10 phase:hg-sn:a10-rhombo	alpha-Hg · A10 · hR1 · R-3m (166)	tier A: standard phase name	not stable in 1 calculated diagram(s)	2	1
DIAMOND_A4 phase:hg-sn:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	not stable in 1 calculated diagram(s)	6	1
BCT_A5 phase:hg-sn:a5-bct	beta-Sn · A5 · tI4 · I4_1/amd (141)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–505.08 K, x(Sn) 1–1	15	1
HGSN12_AF phase:hg-sn:hgsn12-af		needs_review	stable in 1 of 1 calculated diagram(s): 300–484.23 K, x(Sn) 0.88285–0.94493	11	1
HGSN38 phase:hg-sn:hgsn38	HgSn38 · hP1 · P6/mmm (191)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 472.06–497.11 K, x(Sn) 0.97436–0.97436	0	1
HGSN4 phase:hg-sn:hgsn4		needs_review	not stable in 1 calculated diagram(s)	9	1
HGSN7 phase:hg-sn:hgsn7		needs_review	stable in 1 of 1 calculated diagram(s): 300–362.08 K, x(Sn) 0.875–0.875	3	1
LIQUID phase:hg-sn:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 300–2500 K, x(Sn) 0–1	14	1

RHOMBO_A10 (Hg–Sn)

Id: phase:hg-sn:a10-rhombo; status assigned
Structure: alpha-Hg · A10 · hR1 · R-3m (166); type st:a10-alpha-hg-hr1; tier A: standard phase name; confidence high
Stoichiometry: Hg 1.0000
Stability: not stable in 1 calculated diagram(s)
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:hg-sn:a10-rhombo, corpus:phase:hg-sn:rhombo-a10
paper: paper:10.1361/105497103770330776:(Hg)
tdb: tdb:HgSn-03Yen-LB.tdb:RHOMBO_A10

TDB models of RHOMBO_A10 (1): PHASE and CONSTITUENT statements as written

HgSn-03Yen-LB.tdb: RHOMBO_A10, type code %, sha256 c2b9fce680ecdfc1…

36: PHASE RHOMBO_A10 % 1 1 !
37: CONST RHOMBO_A10 : HG : !

Example references (1 of 1; assessments first):

doi:10.1361/105497103770330776 Yee-Wen Yen, Joachim Gröbner, Rainer Schmid-Fetzer, Yee-Wen Yen, Steve C. Hansen, Thermodynamic assessment of the Hg-Sn system, JPE 24, 151-167 (2003).
assessment that models this phase; reports values for this phase

DIAMOND_A4 (Hg–Sn)

Id: phase:hg-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 1 calculated diagram(s)
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:hg-sn:a4-diamond, corpus:phase:hg-sn:diamond-a4
paper: paper:10.1361/105497103770330776:αSn
tdb: tdb:HgSn-03Yen-LB.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (1): PHASE and CONSTITUENT statements as written

HgSn-03Yen-LB.tdb: DIAMOND_A4, type code %, sha256 c2b9fce680ecdfc1…

26: PHASE DIAMOND_A4 % 1 1 !
27: CONST DIAMOND_A4 : SN : !

Example references (2 of 2; assessments first):

doi:10.1361/105497103770330776 Yee-Wen Yen, Joachim Gröbner, Rainer Schmid-Fetzer, Yee-Wen Yen, Steve C. Hansen, Thermodynamic assessment of the Hg-Sn system, JPE 24, 151-167 (2003).
assessment that models this phase; reports values for this phase
doi:10.1179/cmq.1969.8.2.127 R.W. Smith, The constitution of tin-mercury alloys at lower temperatures, Canadian Metallurgical Quarterly 8, 127-129 (1969).
cited as the source of values for this phase

BCT_A5 (Hg–Sn)

Id: phase:hg-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 1 of 1 calculated diagram(s): 300–505.08 K, x(Sn) 1–1
Literature: 15 values (15 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:hg-sn:a5-bct, corpus:phase:hg-sn:bct-a5
paper: paper:10.1361/105497103770330776:(βSn), paper:10.1361/105497103770330776:β, paper:10.1361/105497103770330776:βSn
tdb: tdb:HgSn-03Yen-LB.tdb:BCT_A5

TDB models of BCT_A5 (1): PHASE and CONSTITUENT statements as written

HgSn-03Yen-LB.tdb: BCT_A5, type code %, sha256 c2b9fce680ecdfc1…

31: PHASE BCT_A5 % 1 1 !
32: CONST BCT_A5 : SN : !

Example references (2 of 2; assessments first):

doi:10.1361/105497103770330776 Yee-Wen Yen, Joachim Gröbner, Rainer Schmid-Fetzer, Yee-Wen Yen, Steve C. Hansen, Thermodynamic assessment of the Hg-Sn system, JPE 24, 151-167 (2003).
assessment that models this phase; reports values for this phase
doi:10.6028/jres.067a.008 Duane F. Taylor, Claire L. Burns, An investigation of the constitution of the mercury-tin system, J. RES. NATL. BUR. STAN. SECT. A. 67A, 55 (1963).
cited as the source of values for this phase

HGSN12_AF (Hg–Sn)

Id: phase:hg-sn:hgsn12-af; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:site_ratios_contradict_A_f; site_ratios_contradict_A_f:HgSn-03Yen-LB.tdb
Candidate (literature_printed): HgSn12 · hP1 — printed with a label mapped to this phase
Candidate (name_token): HgSn12 · A_f · hP1 · P6/mmm (191) — Strukturbericht/word 'AF' in the TDB name
Candidate (sgte_mmc2): HgSn12 · A_f · hP1 · P6/mmm (191) — Hallstedt 2025 mmc2 row for HGSN12_AF: HgSn12
Candidate (tdb_comment): HgSn12 · hP1 · P6/mmm — HgSn-03Yen-LB.tdb: 'Prototype HgSn12 (hP1, P6/mmm)'
Stability: stable in 1 of 1 calculated diagram(s): 300–484.23 K, x(Sn) 0.88285–0.94493
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hg-sn:hgsn12-af
paper: paper:10.1361/105497103770330776:γ
tdb: tdb:HgSn-03Yen-LB.tdb:HGSN12_AF

TDB models of HGSN12_AF (1): PHASE and CONSTITUENT statements as written

HgSn-03Yen-LB.tdb: HGSN12_AF, type code %, sha256 c2b9fce680ecdfc1…

51: PHASE HGSN12_AF % 2 1 6 !
52: CONST HGSN12_AF : HG VA : SN : !

Example references (3 of 3; assessments first):

doi:10.1361/105497103770330776 Yee-Wen Yen, Joachim Gröbner, Rainer Schmid-Fetzer, Yee-Wen Yen, Steve C. Hansen, Thermodynamic assessment of the Hg-Sn system, JPE 24, 151-167 (2003).
assessment that models this phase; reports values for this phase
doi:10.1179/cmq.1969.8.2.127 R.W. Smith, The constitution of tin-mercury alloys at lower temperatures, Canadian Metallurgical Quarterly 8, 127-129 (1969).
cited as the source of values for this phase
doi:10.6028/jres.067a.008 Duane F. Taylor, Claire L. Burns, An investigation of the constitution of the mercury-tin system, J. RES. NATL. BUR. STAN. SECT. A. 67A, 55 (1963).
cited as the source of values for this phase

HGSN38 (Hg–Sn)

Id: phase:hg-sn:hgsn38; status assigned
Structure: HgSn38 · hP1 · P6/mmm (191); type st:hgsn38-hp1; 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: Hg 0.0256, Sn 0.9744
Stability: stable in 1 of 1 calculated diagram(s): 472.06–497.11 K, x(Sn) 0.97436–0.97436
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:hg-sn:hgsn38
tdb: tdb:HgSn-03Yen-LB.tdb:HGSN38

TDB models of HGSN38 (1): PHASE and CONSTITUENT statements as written

HgSn-03Yen-LB.tdb: HGSN38, type code %, sha256 c2b9fce680ecdfc1…

56: PHASE HGSN38 % 2 1 38 !
57: CONST HGSN38 : HG : SN : !

Example references (1 of 1; assessments first):

doi:10.1361/105497103770330776 Yee-Wen Yen, Joachim Gröbner, Rainer Schmid-Fetzer, Yee-Wen Yen, Steve C. Hansen, Thermodynamic assessment of the Hg-Sn system, JPE 24, 151-167 (2003).
assessment that models this phase

HGSN4 (Hg–Sn)

Id: phase:hg-sn:hgsn4; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (HgSn4) · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): (HgSn4) — Hallstedt 2025 mmc2 row for HGSN4: HgSn4
Stoichiometry: Hg 0.2000, Sn 0.8000
Stability: not stable in 1 calculated diagram(s)
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hg-sn:hgsn4
paper: paper:10.1361/105497103770330776:HgSn4
tdb: tdb:HgSn-03Yen-LB.tdb:HGSN4

TDB models of HGSN4 (1): PHASE and CONSTITUENT statements as written

HgSn-03Yen-LB.tdb: HGSN4, type code %, sha256 c2b9fce680ecdfc1…

41: PHASE HGSN4 % 2 1 4 !
42: CONST HGSN4 : HG : SN : !

Example references (1 of 1; assessments first):

doi:10.1361/105497103770330776 Yee-Wen Yen, Joachim Gröbner, Rainer Schmid-Fetzer, Yee-Wen Yen, Steve C. Hansen, Thermodynamic assessment of the Hg-Sn system, JPE 24, 151-167 (2003).
assessment that models this phase; reports values for this phase

HGSN7 (Hg–Sn)

Id: phase:hg-sn:hgsn7; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (HgSn7) — Hallstedt 2025 mmc2 row for HGSN7: HgSn7
Stoichiometry: Hg 0.1250, Sn 0.8750
Stability: stable in 1 of 1 calculated diagram(s): 300–362.08 K, x(Sn) 0.875–0.875
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hg-sn:hgsn7
paper: paper:10.1361/105497103770330776:δ, HgSn7
tdb: tdb:HgSn-03Yen-LB.tdb:HGSN7

TDB models of HGSN7 (1): PHASE and CONSTITUENT statements as written

HgSn-03Yen-LB.tdb: HGSN7, type code %, sha256 c2b9fce680ecdfc1…

46: PHASE HGSN7 % 2 1 7 !
47: CONST HGSN7 : HG : SN : !

Example references (1 of 1; assessments first):

doi:10.1361/105497103770330776 Yee-Wen Yen, Joachim Gröbner, Rainer Schmid-Fetzer, Yee-Wen Yen, Steve C. Hansen, Thermodynamic assessment of the Hg-Sn system, JPE 24, 151-167 (2003).
assessment that models this phase; reports values for this phase

LIQUID (Hg–Sn)

Id: phase:hg-sn:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2500 K, x(Sn) 0–1
Literature: 14 values (14 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hg-sn:liquid
paper: paper:10.1361/105497103770330776:L
tdb: tdb:HgSn-03Yen-LB.tdb:LIQUID

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

HgSn-03Yen-LB.tdb: LIQUID, type code %, sha256 c2b9fce680ecdfc1…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : HG SN : !

Example references (3 of 3; assessments first):

doi:10.1361/105497103770330776 Yee-Wen Yen, Joachim Gröbner, Rainer Schmid-Fetzer, Yee-Wen Yen, Steve C. Hansen, Thermodynamic assessment of the Hg-Sn system, JPE 24, 151-167 (2003).
assessment that models this phase; reports values for this phase
doi:10.6028/jres.067a.008 Duane F. Taylor, Claire L. Burns, An investigation of the constitution of the mercury-tin system, J. RES. NATL. BUR. STAN. SECT. A. 67A, 55 (1963).
cited as the source of values for this phase
doi:10.1179/cmq.1969.8.2.127 R.W. Smith, The constitution of tin-mercury alloys at lower temperatures, Canadian Metallurgical Quarterly 8, 127-129 (1969).
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}
}