Re–Si phases

8 phases (tier A 5, tier C 1, liquid 1, needs_review 1); 6 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 · Re–Si system page · Markdown · field reference

Phases of the Re–Si system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
DIAMOND_A4 phase:re-si:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–3999.95 K, x(Si) 1–1	2	2
BCC_A2 phase:re-si:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
FCC_A1 phase:re-si:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
HCP_A3 phase:re-si:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–3999.18 K, x(Si) 0–0.12322	2	2
LIQUID phase:re-si:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 1633.7–4000 K, x(Si) 0–1	12	2
RE2SI phase:re-si:re2si	Re2Si · mP24 · P2_1/c (14)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–2072.83 K, x(Si) 0.33333–0.33333	19	2
RESI_B20 phase:re-si:resi-b20	FeSi · B20 · cP8 · P2_13 (198)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1922.5–2088.64 K, x(Si) 0.5–0.5	10	2
RESI2 phase:re-si:resi2		needs_review	stable in 2 of 2 calculated diagram(s): 300–2229.28 K, x(Si) 0.63807–0.66667	13	2

DIAMOND_A4 (Re–Si)

Id: phase:re-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
Stoichiometry: Si 1.0000
Stability: stable in 2 of 2 calculated diagram(s): 300–3999.95 K, x(Si) 1–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:re-si:a4-diamond, corpus:phase:re-si:diamond-a4
paper: paper:10.1016/j.intermet.2009.06.003:(Si)
tdb: tdb:ReSi-01Sha.tdb:DIAMOND_A4, tdb:ReSi-10Yan.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (2): PHASE and CONSTITUENT statements as written

ReSi-01Sha.tdb: DIAMOND_A4, type code %, sha256 8a623c4f1c1cc1b7…

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

ReSi-10Yan.tdb: DIAMOND_A4, type code %, sha256 6fc754ec7ed8d85e…

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

Example references (3 of 3; assessments first):

doi:10.1016/j.intermet.2009.06.003 Ying Yang, Shuanglin Chen, Y. Austin Chang, Thermodynamic modeling of the Re–Si–B system, Intermetallics 18, 51-56 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/S0966-9795(01)00110-8 G. Shao, Intermetallics, 9, 1063-68(2001).
assessment that models this phase
doi:10.1007/bf02667640 A. B. Gokhale, R. Abbaschian, The Re-Si system (rhenium-silicon), JPE 17, 451-454 (1996).
cited as the source of values for this phase

BCC_A2 (Re–Si)

Id: phase:re-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 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:re-si:bcc-a2
tdb: tdb:ReSi-01Sha.tdb:BCC_A2, tdb:ReSi-10Yan.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

ReSi-01Sha.tdb: BCC_A2, type code %B, sha256 8a623c4f1c1cc1b7…

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

ReSi-10Yan.tdb: BCC_A2, type code %B, sha256 6fc754ec7ed8d85e…

32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : RE SI : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.intermet.2009.06.003 Ying Yang, Shuanglin Chen, Y. Austin Chang, Thermodynamic modeling of the Re–Si–B system, Intermetallics 18, 51-56 (2010).
assessment that models this phase
doi:10.1016/S0966-9795(01)00110-8 G. Shao, Intermetallics, 9, 1063-68(2001).
assessment that models this phase

FCC_A1 (Re–Si)

Id: phase:re-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: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:re-si:fcc-a1
tdb: tdb:ReSi-01Sha.tdb:FCC_A1, tdb:ReSi-10Yan.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

ReSi-01Sha.tdb: FCC_A1, type code %A, sha256 8a623c4f1c1cc1b7…

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

ReSi-10Yan.tdb: FCC_A1, type code %A, sha256 6fc754ec7ed8d85e…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : RE SI : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.intermet.2009.06.003 Ying Yang, Shuanglin Chen, Y. Austin Chang, Thermodynamic modeling of the Re–Si–B system, Intermetallics 18, 51-56 (2010).
assessment that models this phase
doi:10.1016/S0966-9795(01)00110-8 G. Shao, Intermetallics, 9, 1063-68(2001).
assessment that models this phase

HCP_A3 (Re–Si)

Id: phase:re-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: stable in 2 of 2 calculated diagram(s): 300–3999.18 K, x(Si) 0–0.12322
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:re-si:hcp-a3
paper: paper:10.1016/j.intermet.2009.06.003:(Re)
tdb: tdb:ReSi-01Sha.tdb:HCP_A3, tdb:ReSi-10Yan.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

ReSi-01Sha.tdb: HCP_A3, type code %A, sha256 8a623c4f1c1cc1b7…

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

ReSi-10Yan.tdb: HCP_A3, type code %A, sha256 6fc754ec7ed8d85e…

37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : RE% SI : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.intermet.2009.06.003 Ying Yang, Shuanglin Chen, Y. Austin Chang, Thermodynamic modeling of the Re–Si–B system, Intermetallics 18, 51-56 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/S0966-9795(01)00110-8 G. Shao, Intermetallics, 9, 1063-68(2001).
assessment that models this phase
doi:10.1007/bf02667640 A. B. Gokhale, R. Abbaschian, The Re-Si system (rhenium-silicon), JPE 17, 451-454 (1996).
cited as the source of values for this phase

LIQUID (Re–Si)

Id: phase:re-si:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1633.7–4000 K, x(Si) 0–1
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:re-si:liquid
paper: paper:10.1016/j.intermet.2009.06.003:L
tdb: tdb:ReSi-01Sha.tdb:LIQUID, tdb:ReSi-10Yan.tdb:LIQUID

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

ReSi-01Sha.tdb: LIQUID, type code %, sha256 8a623c4f1c1cc1b7…

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

ReSi-10Yan.tdb: LIQUID, type code %, sha256 6fc754ec7ed8d85e…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : RE SI : !

Example references (3 of 3; assessments first):

doi:10.1016/j.intermet.2009.06.003 Ying Yang, Shuanglin Chen, Y. Austin Chang, Thermodynamic modeling of the Re–Si–B system, Intermetallics 18, 51-56 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/S0966-9795(01)00110-8 G. Shao, Intermetallics, 9, 1063-68(2001).
assessment that models this phase
doi:10.1007/bf02667640 A. B. Gokhale, R. Abbaschian, The Re-Si system (rhenium-silicon), JPE 17, 451-454 (1996).
cited as the source of values for this phase

RE2SI (Re–Si)

Id: phase:re-si:re2si; status assigned
Structure: Re2Si · mP24 · P2_1/c (14); type st:re2si-mp24; 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_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Re 0.6667, Si 0.3333
Stability: stable in 2 of 2 calculated diagram(s): 300–2072.83 K, x(Si) 0.33333–0.33333
Literature: 19 values (19 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:re-si:re2si
paper: paper:10.1016/j.intermet.2009.06.003:Re2Si, paper:10.1016/s0966-9795(01)00110-8:Re2Si
tdb: tdb:ReSi-01Sha.tdb:RE2SI, tdb:ReSi-10Yan.tdb:RE2SI

TDB models of RE2SI (2): PHASE and CONSTITUENT statements as written

ReSi-01Sha.tdb: RE2SI, type code %, sha256 8a623c4f1c1cc1b7…

48: PHASE RE2SI % 2 2 1 !
49: CONST RE2SI : RE : SI : !

ReSi-10Yan.tdb: RE2SI, type code %, sha256 6fc754ec7ed8d85e…

47: PHASE RE2SI % 2 2 1 !
48: CONST RE2SI : RE : SI : !

Example references (5 of 5; assessments first):

doi:10.1016/j.intermet.2009.06.003 Ying Yang, Shuanglin Chen, Y. Austin Chang, Thermodynamic modeling of the Re–Si–B system, Intermetallics 18, 51-56 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/S0966-9795(01)00110-8 G. Shao, Intermetallics, 9, 1063-68(2001).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1007/bf02667640 A. B. Gokhale, R. Abbaschian, The Re-Si system (rhenium-silicon), JPE 17, 451-454 (1996).
cited as the source of values for this phase
doi:10.1021/ja01103a017 Alan W. Searcy, Robert A. McNees, The Silicides of Rhenium1-3, J. Am. Chem. Soc. 75, 1578-1580 (1953).
cited as the source of values for this phase
doi:10.1016/s0925-8388(98)00747-6 S.V. Meschel, O.J. Kleppa, Standard enthalpies of formation of some 5d transition metal silicides by high temperature direct synthesis calorimetry, Journal of Alloys and Compounds 280, 231-239 (1998).
cited as the source of values for this phase

RESI_B20 (Re–Si)

Id: phase:re-si:resi-b20; status assigned
Structure: FeSi · B20 · cP8 · P2_13 (198); type st:b20-fesi-cp8; tier A: standard phase name; confidence high
Stoichiometry: Re 0.5000, Si 0.5000
Stability: stable in 2 of 2 calculated diagram(s): 1922.5–2088.64 K, x(Si) 0.5–0.5
Literature: 10 values (10 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:re-si:resi-b20
paper: paper:10.1016/j.intermet.2009.06.003:ReSi, paper:10.1016/s0966-9795(01)00110-8:ReSi
tdb: tdb:ReSi-01Sha.tdb:RESI_B20, tdb:ReSi-10Yan.tdb:RESI_B20

TDB models of RESI_B20 (2): PHASE and CONSTITUENT statements as written

ReSi-01Sha.tdb: RESI_B20, type code %, sha256 8a623c4f1c1cc1b7…

53: PHASE RESI_B20 % 2 1 1 !
54: CONST RESI_B20 : RE : SI : !

ReSi-10Yan.tdb: RESI_B20, type code %, sha256 6fc754ec7ed8d85e…

52: PHASE RESI_B20 % 2 1 1 !
53: CONST RESI_B20 : RE : SI : !

Example references (5 of 5; assessments first):

doi:10.1016/j.intermet.2009.06.003 Ying Yang, Shuanglin Chen, Y. Austin Chang, Thermodynamic modeling of the Re–Si–B system, Intermetallics 18, 51-56 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/S0966-9795(01)00110-8 G. Shao, Intermetallics, 9, 1063-68(2001).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02667640 A. B. Gokhale, R. Abbaschian, The Re-Si system (rhenium-silicon), JPE 17, 451-454 (1996).
cited as the source of values for this phase
doi:10.1016/0364-5916(81)90013-4 E.S. Machlin, Calphad 5 (1981) 1.
cited as the source of values for this phase
doi:10.1021/ja01103a017 Alan W. Searcy, Robert A. McNees, The Silicides of Rhenium1-3, J. Am. Chem. Soc. 75, 1578-1580 (1953).
cited as the source of values for this phase

RESI2 (Re–Si)

Id: phase:re-si:resi2; status needs_review
No structure assigned. Why: assessment_declared_compound_differs_from_model_composition; no_structure_token; off_stoichiometric_model
Candidate (literature_printed): Re4Si7 · mC44 — printed with a label mapped to this phase
Candidate (sgte_mmc2): Re4Si7 · mC44 · Cm (8) — Hallstedt 2025 mmc2 row for RESI2: ReSi2
Candidate (tdb_comment): Re4Si7 · mC44 · Cm — ReSi-01Sha.tdb: 'Prototype Re4Si7 (mC44, Cm)'
Candidate (tdb_comment): Re4Si7 · mC44 · Cm — ReSi-10Yan.tdb: 'Prototype Re4Si7 (mC44, Cm)'
Stability: stable in 2 of 2 calculated diagram(s): 300–2229.28 K, x(Si) 0.63807–0.66667
Literature: 13 values (13 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:re-si:resi2
paper: paper:10.1016/j.intermet.2009.06.003:ReSi2
tdb: tdb:ReSi-01Sha.tdb:RESI2, tdb:ReSi-10Yan.tdb:RESI2

TDB models of RESI2 (2): PHASE and CONSTITUENT statements as written

ReSi-01Sha.tdb: RESI2, type code %, sha256 8a623c4f1c1cc1b7…

58: PHASE RESI2 % 2 1 1.8 !
59: CONST RESI2 : RE : SI : !

ReSi-10Yan.tdb: RESI2, type code %, sha256 6fc754ec7ed8d85e…

57: PHASE RESI2 % 2 1 2 !
58: CONST RESI2 : RE : SI VA : !

Example references (4 of 4; assessments first):

doi:10.1016/j.intermet.2009.06.003 Ying Yang, Shuanglin Chen, Y. Austin Chang, Thermodynamic modeling of the Re–Si–B system, Intermetallics 18, 51-56 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/S0966-9795(01)00110-8 G. Shao, Intermetallics, 9, 1063-68(2001).
assessment that models this phase; cited as the source of values for this phase
doi:10.1007/bf02667640 A. B. Gokhale, R. Abbaschian, The Re-Si system (rhenium-silicon), JPE 17, 451-454 (1996).
cited as the source of values for this phase
doi:10.1021/ja01103a017 Alan W. Searcy, Robert A. McNees, The Silicides of Rhenium1-3, J. Am. Chem. Soc. 75, 1578-1580 (1953).
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}
}