Ag–Cu phases

4 phases (tier A 3, liquid 1); 2 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 · Ag–Cu system page · Markdown · field reference

Phases of the Ag–Cu system (4)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:ag-cu:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 6 calculated diagram(s)	0	6
FCC_A1 phase:ag-cu:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 6 of 6 calculated diagram(s): 300–2499.02 K, x(Cu) 0–1	5	6
HCP_A3 phase:ag-cu:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 6 calculated diagram(s)	0	6
LIQUID phase:ag-cu:liquid	liquid	liquid	stable in 6 of 6 calculated diagram(s): 1052.28–2500 K, x(Cu) 0–1	5	6

BCC_A2 (Ag–Cu)

Id: phase:ag-cu: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 6 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:ag-cu:bcc-a2
tdb: tdb:AgCu-00Moo.tdb:BCC_A2, tdb:AgCu-04Wit-LB.tdb:BCC_A2, tdb:AgCu-06He.tdb:BCC_A2, tdb:AgCu-86Hay.tdb:BCC_A2, tdb:AgCu-88Joe.tdb:BCC_A2, tdb:AgCu-98Luk.tdb:BCC_A2

TDB models of BCC_A2 (6): PHASE and CONSTITUENT statements as written

AgCu-00Moo.tdb: BCC_A2, type code %B, sha256 1e55749c73122903…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : AG CU : VA : !

AgCu-04Wit-LB.tdb: BCC_A2, type code %B, sha256 d0b7c5fc74190270…

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

AgCu-06He.tdb: BCC_A2, type code %B, sha256 454efb43f047fe25…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : AG CU : VA : !

AgCu-86Hay.tdb: BCC_A2, type code %B, sha256 2dde865753d877b6…

31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : AG CU : VA : !

AgCu-88Joe.tdb: BCC_A2, type code %B, sha256 efd48daf5625109e…

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

AgCu-98Luk.tdb: BCC_A2, type code %B, sha256 b1f37711e5a07cb6…

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

Example references (4 of 4; assessments first):

doi:10.1007/s11664-000-0003-x K. -W. Moon, W. J. Boettinger, U. R. Kattner, F. S. Biancaniello, C. A. Handwerker, Experimental and thermodynamic assessment of Sn-Ag-Cu solder alloys, Journal of Elec Materi 29, 1122-1136 (2000).
assessment that models this phase
doi:10.1016/j.calphad.2006.09.001 X.C. He, H. Wang, H.S. Liu, Z.P. Jin, Thermodynamic description of the Cu–Ag–Zr system, Calphad 30, 367-374 (2006).
assessment that models this phase
doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase
doi:10.1515/ijmr-1986-771108 F.H. Hayes, H.L. Lukas, G. Effenberg, G. Petzow, Z. Metallkd., 77, 749-54(1986).
assessment that models this phase

FCC_A1 (Ag–Cu)

Id: phase:ag-cu: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 6 of 6 calculated diagram(s): 300–2499.02 K, x(Cu) 0–1
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:ag-cu:fcc-a1
paper: paper:10.1016/j.jallcom.2004.04.126:(Cu)
tdb: tdb:AgCu-00Moo.tdb:FCC_A1, tdb:AgCu-04Wit-LB.tdb:FCC_A1, tdb:AgCu-06He.tdb:FCC_A1, tdb:AgCu-86Hay.tdb:FCC_A1, tdb:AgCu-88Joe.tdb:FCC_A1, tdb:AgCu-98Luk.tdb:FCC_A1

TDB models of FCC_A1 (6): PHASE and CONSTITUENT statements as written

AgCu-00Moo.tdb: FCC_A1, type code %A, sha256 1e55749c73122903…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : AG% CU% : VA : !

AgCu-04Wit-LB.tdb: FCC_A1, type code %A, sha256 d0b7c5fc74190270…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : AG% CU% : VA : !

AgCu-06He.tdb: FCC_A1, type code %A, sha256 454efb43f047fe25…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : AG% CU% : VA : !

AgCu-86Hay.tdb: FCC_A1, type code %A, sha256 2dde865753d877b6…

26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : AG% CU% : VA : !

AgCu-88Joe.tdb: FCC_A1, type code %A, sha256 efd48daf5625109e…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : AG% CU% : VA : !

AgCu-98Luk.tdb: FCC_A1, type code %A, sha256 b1f37711e5a07cb6…

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

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-000-0003-x K. -W. Moon, W. J. Boettinger, U. R. Kattner, F. S. Biancaniello, C. A. Handwerker, Experimental and thermodynamic assessment of Sn-Ag-Cu solder alloys, Journal of Elec Materi 29, 1122-1136 (2000).
assessment that models this phase
doi:10.1016/j.calphad.2006.09.001 X.C. He, H. Wang, H.S. Liu, Z.P. Jin, Thermodynamic description of the Cu–Ag–Zr system, Calphad 30, 367-374 (2006).
assessment that models this phase
doi:10.1515/ijmr-1986-771108 F.H. Hayes, H.L. Lukas, G. Effenberg, G. Petzow, Z. Metallkd., 77, 749-54(1986).
assessment that models this phase

HCP_A3 (Ag–Cu)

Id: phase:ag-cu: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: not stable in 6 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:ag-cu:hcp-a3
tdb: tdb:AgCu-00Moo.tdb:HCP_A3, tdb:AgCu-04Wit-LB.tdb:HCP_A3, tdb:AgCu-06He.tdb:HCP_A3, tdb:AgCu-86Hay.tdb:HCP_A3, tdb:AgCu-88Joe.tdb:HCP_A3, tdb:AgCu-98Luk.tdb:HCP_A3

TDB models of HCP_A3 (6): PHASE and CONSTITUENT statements as written

AgCu-00Moo.tdb: HCP_A3, type code %A, sha256 1e55749c73122903…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : AG CU : VA : !

AgCu-04Wit-LB.tdb: HCP_A3, type code %A, sha256 d0b7c5fc74190270…

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

AgCu-06He.tdb: HCP_A3, type code %A, sha256 454efb43f047fe25…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : AG CU : VA : !

AgCu-86Hay.tdb: HCP_A3, type code %A, sha256 2dde865753d877b6…

36: PHASE HCP_A3 %A 2 1 0.5 !
37: CONST HCP_A3 : AG CU : VA : !

AgCu-88Joe.tdb: HCP_A3, type code %A, sha256 efd48daf5625109e…

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

AgCu-98Luk.tdb: HCP_A3, type code %A, sha256 b1f37711e5a07cb6…

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

Example references (4 of 4; assessments first):

doi:10.1007/s11664-000-0003-x K. -W. Moon, W. J. Boettinger, U. R. Kattner, F. S. Biancaniello, C. A. Handwerker, Experimental and thermodynamic assessment of Sn-Ag-Cu solder alloys, Journal of Elec Materi 29, 1122-1136 (2000).
assessment that models this phase
doi:10.1016/j.calphad.2006.09.001 X.C. He, H. Wang, H.S. Liu, Z.P. Jin, Thermodynamic description of the Cu–Ag–Zr system, Calphad 30, 367-374 (2006).
assessment that models this phase
doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase
doi:10.1515/ijmr-1986-771108 F.H. Hayes, H.L. Lukas, G. Effenberg, G. Petzow, Z. Metallkd., 77, 749-54(1986).
assessment that models this phase

LIQUID (Ag–Cu)

Id: phase:ag-cu:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 6 of 6 calculated diagram(s): 1052.28–2500 K, x(Cu) 0–1
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:ag-cu:liquid
paper: paper:10.1016/j.jallcom.2004.04.126:L
tdb: tdb:AgCu-00Moo.tdb:LIQUID, tdb:AgCu-04Wit-LB.tdb:LIQUID, tdb:AgCu-06He.tdb:LIQUID, tdb:AgCu-86Hay.tdb:LIQUID, tdb:AgCu-88Joe.tdb:LIQUID, tdb:AgCu-98Luk.tdb:LIQUID

TDB models of LIQUID (6): PHASE and CONSTITUENT statements as written

AgCu-00Moo.tdb: LIQUID, type code %, sha256 1e55749c73122903…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : AG CU : !

AgCu-04Wit-LB.tdb: LIQUID, type code %, sha256 d0b7c5fc74190270…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : AG CU : !

AgCu-06He.tdb: LIQUID, type code %, sha256 454efb43f047fe25…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : AG CU : !

AgCu-86Hay.tdb: LIQUID, type code %, sha256 2dde865753d877b6…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : AG CU : !

AgCu-88Joe.tdb: LIQUID, type code %, sha256 efd48daf5625109e…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : AG CU : !

AgCu-98Luk.tdb: LIQUID, type code %, sha256 b1f37711e5a07cb6…

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

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2004.04.126 V.T. Witusiewicz, U. Hecht, S.G. Fries, S. Rex, The Ag–Al–Cu system, Journal of Alloys and Compounds 385, 133-143 (2004).
assessment that models this phase; reports values for this phase
doi:10.1007/s11664-000-0003-x K. -W. Moon, W. J. Boettinger, U. R. Kattner, F. S. Biancaniello, C. A. Handwerker, Experimental and thermodynamic assessment of Sn-Ag-Cu solder alloys, Journal of Elec Materi 29, 1122-1136 (2000).
assessment that models this phase
doi:10.1016/j.calphad.2006.09.001 X.C. He, H. Wang, H.S. Liu, Z.P. Jin, Thermodynamic description of the Cu–Ag–Zr system, Calphad 30, 367-374 (2006).
assessment that models this phase
doi:10.1515/ijmr-1986-771108 F.H. Hayes, H.L. Lukas, G. Effenberg, G. Petzow, Z. Metallkd., 77, 749-54(1986).
assessment that models 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}
}