Au–Si phases

5 phases (tier A 4, liquid 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 · Au–Si system page · Markdown · field reference

Phases of the Au–Si system (5)
Phase	Structure	Basis	Stability (calculated)	TDB models
DIAMOND_A4 phase:au-si:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–2499.87 K, x(Si) 0.99994–1	4
BCC_A2 phase:au-si:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 4 calculated diagram(s)	4
FCC_A1 phase:au-si:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 4 of 4 calculated diagram(s): 300–1356.68 K, x(Si) 0–0.00085	4
HCP_A3 phase:au-si:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 4 calculated diagram(s)	4
LIQUID phase:au-si:liquid	liquid	liquid	stable in 4 of 4 calculated diagram(s): 632.53–2500 K, x(Si) 0–1	4

DIAMOND_A4 (Au–Si)

Id: phase:au-si: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
Stability: stable in 4 of 4 calculated diagram(s): 300–2499.87 K, x(Si) 0.99994–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:au-si:a4-diamond
tdb: tdb:AuSi-07Men.tdb:DIAMOND_A4, tdb:AuSi-85Sau.tdb:DIAMOND_A4, tdb:AuSi-89Che.tdb:DIAMOND_A4, tdb:AuSi-98Che-LB.tdb:DIAMOND_A4

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

AuSi-07Men.tdb: DIAMOND_A4, type code %, sha256 fb773e4798f0139d…

39: PHASE DIAMOND_A4 % 1 1 !
40: CONST DIAMOND_A4 : AU SI% : !

AuSi-85Sau.tdb: DIAMOND_A4, type code %, sha256 af731068b76937fd…

39: PHASE DIAMOND_A4 % 1 1 !
40: CONST DIAMOND_A4 : SI : !

AuSi-89Che.tdb: DIAMOND_A4, type code %, sha256 0215614f9582b192…

40: PHASE DIAMOND_A4 % 1 1 !
41: CONST DIAMOND_A4 : AU SI% : !

AuSi-98Che-LB.tdb: DIAMOND_A4, type code %, sha256 5a11525d97fbc6bb…

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

Example references (3 of 3; assessments first):

doi:10.1016/0040-6031(89)87056-X P.-Y. Chevalier, Thermochim. Acta, 141, 217-26(1989).
assessment that models this phase
doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
assessment that models this phase
doi:10.1016/j.jallcom.2006.05.066 F.G. Meng, H.S. Liu, L.B. Liu, Z.P. Jin, Thermodynamic description of the Au–Si–Sn system, Journal of Alloys and Compounds 431, 292-297 (2007).
assessment that models this phase

BCC_A2 (Au–Si)

Id: phase:au-si: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:au-si:bcc-a2
tdb: tdb:AuSi-07Men.tdb:BCC_A2, tdb:AuSi-85Sau.tdb:BCC_A2, tdb:AuSi-89Che.tdb:BCC_A2, tdb:AuSi-98Che-LB.tdb:BCC_A2

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

AuSi-07Men.tdb: BCC_A2, type code %B, sha256 fb773e4798f0139d…

29: PHASE BCC_A2 %B 2 1 3 !
30: CONST BCC_A2 : AU SI : VA : !

AuSi-85Sau.tdb: BCC_A2, type code %B, sha256 af731068b76937fd…

29: PHASE BCC_A2 %B 2 1 3 !
30: CONST BCC_A2 : AU SI : VA : !

AuSi-89Che.tdb: BCC_A2, type code %B, sha256 0215614f9582b192…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : AU SI : VA : !

AuSi-98Che-LB.tdb: BCC_A2, type code %B, sha256 5a11525d97fbc6bb…

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

Example references (3 of 3; assessments first):

doi:10.1016/0040-6031(89)87056-X P.-Y. Chevalier, Thermochim. Acta, 141, 217-26(1989).
assessment that models this phase
doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
assessment that models this phase
doi:10.1016/j.jallcom.2006.05.066 F.G. Meng, H.S. Liu, L.B. Liu, Z.P. Jin, Thermodynamic description of the Au–Si–Sn system, Journal of Alloys and Compounds 431, 292-297 (2007).
assessment that models this phase

FCC_A1 (Au–Si)

Id: phase:au-si: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): 300–1356.68 K, x(Si) 0–0.00085
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:au-si:fcc-a1
tdb: tdb:AuSi-07Men.tdb:FCC_A1, tdb:AuSi-85Sau.tdb:FCC_A1, tdb:AuSi-89Che.tdb:FCC_A1, tdb:AuSi-98Che-LB.tdb:FCC_A1

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

AuSi-07Men.tdb: FCC_A1, type code %A, sha256 fb773e4798f0139d…

24: PHASE FCC_A1 %A 2 1 1 !
25: CONST FCC_A1 : AU% SI : VA : !

AuSi-85Sau.tdb: FCC_A1, type code %A, sha256 af731068b76937fd…

24: PHASE FCC_A1 %A 2 1 1 !
25: CONST FCC_A1 : AU% SI : VA : !

AuSi-89Che.tdb: FCC_A1, type code %A, sha256 0215614f9582b192…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : AU% SI : VA : !

AuSi-98Che-LB.tdb: FCC_A1, type code %A, sha256 5a11525d97fbc6bb…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : AU% SI : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/0040-6031(89)87056-X P.-Y. Chevalier, Thermochim. Acta, 141, 217-26(1989).
assessment that models this phase
doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
assessment that models this phase
doi:10.1016/j.jallcom.2006.05.066 F.G. Meng, H.S. Liu, L.B. Liu, Z.P. Jin, Thermodynamic description of the Au–Si–Sn system, Journal of Alloys and Compounds 431, 292-297 (2007).
assessment that models this phase

HCP_A3 (Au–Si)

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

Names (5): corpus: corpus:phase:au-si:hcp-a3
tdb: tdb:AuSi-07Men.tdb:HCP_A3, tdb:AuSi-85Sau.tdb:HCP_A3, tdb:AuSi-89Che.tdb:HCP_A3, tdb:AuSi-98Che-LB.tdb:HCP_A3

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

AuSi-07Men.tdb: HCP_A3, type code %A, sha256 fb773e4798f0139d…

34: PHASE HCP_A3 %A 2 1 0.5 !
35: CONST HCP_A3 : AU SI : VA : !

AuSi-85Sau.tdb: HCP_A3, type code %A, sha256 af731068b76937fd…

34: PHASE HCP_A3 %A 2 1 0.5 !
35: CONST HCP_A3 : AU SI : VA : !

AuSi-89Che.tdb: HCP_A3, type code %A, sha256 0215614f9582b192…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : AU SI : VA : !

AuSi-98Che-LB.tdb: HCP_A3, type code %A, sha256 5a11525d97fbc6bb…

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

Example references (3 of 3; assessments first):

doi:10.1016/0040-6031(89)87056-X P.-Y. Chevalier, Thermochim. Acta, 141, 217-26(1989).
assessment that models this phase
doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
assessment that models this phase
doi:10.1016/j.jallcom.2006.05.066 F.G. Meng, H.S. Liu, L.B. Liu, Z.P. Jin, Thermodynamic description of the Au–Si–Sn system, Journal of Alloys and Compounds 431, 292-297 (2007).
assessment that models this phase

LIQUID (Au–Si)

Id: phase:au-si:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 4 of 4 calculated diagram(s): 632.53–2500 K, x(Si) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:au-si:liquid
tdb: tdb:AuSi-07Men.tdb:LIQUID, tdb:AuSi-85Sau.tdb:LIQUID, tdb:AuSi-89Che.tdb:LIQUID, tdb:AuSi-98Che-LB.tdb:LIQUID

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

AuSi-07Men.tdb: LIQUID, type code %, sha256 fb773e4798f0139d…

19: PHASE LIQUID:L % 1 1 !
20: CONST LIQUID:L : AU SI : !

AuSi-85Sau.tdb: LIQUID, type code %, sha256 af731068b76937fd…

19: PHASE LIQUID:L % 1 1 !
20: CONST LIQUID:L : AU SI : !

AuSi-89Che.tdb: LIQUID, type code %, sha256 0215614f9582b192…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : AU SI : !

AuSi-98Che-LB.tdb: LIQUID, type code %, sha256 5a11525d97fbc6bb…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : AU SI : !

Example references (3 of 3; assessments first):

doi:10.1016/0040-6031(89)87056-X P.-Y. Chevalier, Thermochim. Acta, 141, 217-26(1989).
assessment that models this phase
doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
assessment that models this phase
doi:10.1016/j.jallcom.2006.05.066 F.G. Meng, H.S. Liu, L.B. Liu, Z.P. Jin, Thermodynamic description of the Au–Si–Sn system, Journal of Alloys and Compounds 431, 292-297 (2007).
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}
}