Cu–Hg phases

6 phases (tier A 4, liquid 1, needs_review 1); 3 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 · Cu–Hg system page · Markdown · field reference

Phases of the Cu–Hg system (6)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
RHOMBO_A10 phase:cu-hg:a10-rhombo	alpha-Hg · A10 · hR1 · R-3m (166)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1	1
BCC_A2 phase:cu-hg:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
CU7HG6_D810 phase:cu-hg:cu7hg6-d810		needs_review	stable in 1 of 1 calculated diagram(s): 300–401.54 K, x(Hg) 0.46154–0.46154	3	1
FCC_A1 phase:cu-hg:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1358.77 K, x(Hg) 0–0.04872	4	1
HCP_A3 phase:cu-hg:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
LIQUID phase:cu-hg:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 300–2500 K, x(Hg) 0–1	5	1

RHOMBO_A10 (Cu–Hg)

Id: phase:cu-hg: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: 1 values (1 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cu-hg:a10-rhombo, corpus:phase:cu-hg:rhombo-a10
paper: paper:10.1016/j.tca.2012.08.004:(Hg)
tdb: tdb:CuHg-12Liu.tdb:RHOMBO_A10

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

CuHg-12Liu.tdb: RHOMBO_A10, type code %, sha256 8828bc33c96d3b4c…

43: PHASE RHOMBO_A10 % 1 1 !
44: CONST RHOMBO_A10 : HG : !

Example references (1 of 1; assessments first):

doi:10.1016/j.tca.2012.08.004 Yajun Liu, Guan Wang, Jiang Wang, Yang Chen, Zhaohui Long, Phase equilibria and thermodynamic functions for Ag–Hg and Cu–Hg binary systems, Thermochimica Acta 547, 83-88 (2012).
assessment that models this phase; reports values for this phase

BCC_A2 (Cu–Hg)

Id: phase:cu-hg:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stoichiometry: Cu 1.0000
Stability: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:cu-hg:bcc-a2
tdb: tdb:CuHg-12Liu.tdb:BCC_A2

TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written

CuHg-12Liu.tdb: BCC_A2, type code %B, sha256 8828bc33c96d3b4c…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.tca.2012.08.004 Yajun Liu, Guan Wang, Jiang Wang, Yang Chen, Zhaohui Long, Phase equilibria and thermodynamic functions for Ag–Hg and Cu–Hg binary systems, Thermochimica Acta 547, 83-88 (2012).
assessment that models this phase

CU7HG6_D810 (Cu–Hg)

Id: phase:cu-hg:cu7hg6-d810; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_D8_10; stoichiometry_contradicts_D8_10:CuHg-12Liu.tdb
Candidate (literature_printed): Al8Cr5 · hR26 — printed with a label mapped to this phase
Candidate (name_token): Al8Cr5 · D8_10 · hR26 · R3m (160) — Strukturbericht/word 'D810' in the TDB name
Candidate (sgte_mmc2): Al8Cr5 · D8_10 · hR26 · R3m (160) — Hallstedt 2025 mmc2 row for CU7HG6_D810: Cu7Hg6 (gamma-brass related)
Candidate (tdb_comment): Al8Cr5 · hR26 · R3m — CuHg-12Liu.tdb: 'Prototype Al8Cr5 (hR26, R3m)'
Stoichiometry: Cu 0.5385, Hg 0.4615
Stability: stable in 1 of 1 calculated diagram(s): 300–401.54 K, x(Hg) 0.46154–0.46154
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-hg:cu7hg6-d810
paper: paper:10.1016/j.tca.2012.08.004:Cu7Hg6
tdb: tdb:CuHg-12Liu.tdb:CU7HG6_D810

TDB models of CU7HG6_D810 (1): PHASE and CONSTITUENT statements as written

CuHg-12Liu.tdb: CU7HG6_D810, type code %, sha256 8828bc33c96d3b4c…

48: PHASE CU7HG6_D810 % 2 7 6 !
49: CONST CU7HG6_D810 : CU : HG : !

Example references (1 of 1; assessments first):

doi:10.1016/j.tca.2012.08.004 Yajun Liu, Guan Wang, Jiang Wang, Yang Chen, Zhaohui Long, Phase equilibria and thermodynamic functions for Ag–Hg and Cu–Hg binary systems, Thermochimica Acta 547, 83-88 (2012).
assessment that models this phase; reports values for this phase

FCC_A1 (Cu–Hg)

Id: phase:cu-hg: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 1 of 1 calculated diagram(s): 300–1358.77 K, x(Hg) 0–0.04872
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-hg:fcc-a1
paper: paper:10.1016/j.tca.2012.08.004:fcc
tdb: tdb:CuHg-12Liu.tdb:FCC_A1

TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written

CuHg-12Liu.tdb: FCC_A1, type code %A, sha256 8828bc33c96d3b4c…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : CU% HG : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.tca.2012.08.004 Yajun Liu, Guan Wang, Jiang Wang, Yang Chen, Zhaohui Long, Phase equilibria and thermodynamic functions for Ag–Hg and Cu–Hg binary systems, Thermochimica Acta 547, 83-88 (2012).
assessment that models this phase; reports values for this phase

HCP_A3 (Cu–Hg)

Id: phase:cu-hg:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stoichiometry: Cu 1.0000
Stability: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:cu-hg:hcp-a3
tdb: tdb:CuHg-12Liu.tdb:HCP_A3

TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written

CuHg-12Liu.tdb: HCP_A3, type code %A, sha256 8828bc33c96d3b4c…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.tca.2012.08.004 Yajun Liu, Guan Wang, Jiang Wang, Yang Chen, Zhaohui Long, Phase equilibria and thermodynamic functions for Ag–Hg and Cu–Hg binary systems, Thermochimica Acta 547, 83-88 (2012).
assessment that models this phase

LIQUID (Cu–Hg)

Id: phase:cu-hg:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2500 K, x(Hg) 0–1
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cu-hg:liquid
paper: paper:10.1016/j.tca.2012.08.004:liq
tdb: tdb:CuHg-12Liu.tdb:LIQUID

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

CuHg-12Liu.tdb: LIQUID, type code %, sha256 8828bc33c96d3b4c…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : CU HG : !

Example references (1 of 1; assessments first):

doi:10.1016/j.tca.2012.08.004 Yajun Liu, Guan Wang, Jiang Wang, Yang Chen, Zhaohui Long, Phase equilibria and thermodynamic functions for Ag–Hg and Cu–Hg binary systems, Thermochimica Acta 547, 83-88 (2012).
assessment that models this phase; reports 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}
}