Hf–Si phases

11 phases (tier A 9, tier C 1, liquid 1); 10 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 · Hf–Si system page · Markdown · field reference

Phases of the Hf–Si system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
DIAMOND_A4 phase:hf-si:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–3999.18 K, x(Si) 1–1	4	3
BCC_A2 phase:hf-si:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 2013.35–2548.99 K, x(Si) 0–0.00211	6	3
FCC_A1 phase:hf-si:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
HCP_A3 phase:hf-si:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2016.03 K, x(Si) 0–0.00067	2	3
HF2SI_C16 phase:hf-si:hf2si-c16	Al2Cu · C16 · tI12 · I4/mcm (140)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2365.31 K, x(Si) 0.33333–0.33333	15	3
HF3SI2_D5A phase:hf-si:hf3si2-d5a	Si2U3 · D5_a · tP10 · P4/mbm (127)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2752.96 K, x(Si) 0.4–0.4	16	3
HF5SI3_D88 phase:hf-si:hf5si3-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 1816.93–2740.16 K, x(Si) 0.375–0.375	13	3
HF5SI4 phase:hf-si:hf5si4	Si4Zr5 · tP36 · P4_12_12 (92)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 3 of 3 calculated diagram(s): 300–2595.12 K, x(Si) 0.44444–0.44444	10	3
HFSI_B27 phase:hf-si:hfsi-b27	FeB · B27 · oP8 · Pnma (62)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2416.93 K, x(Si) 0.5–0.5	8	3
HFSI2_C49 phase:hf-si:hfsi2-c49	ZrSi2 · C49 · oC12 · Cmcm (63)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1818.85 K, x(Si) 0.66667–0.66667	8	3
LIQUID phase:hf-si:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 1597.92–4000 K, x(Si) 0–1	33	3

DIAMOND_A4 (Hf–Si)

Id: phase:hf-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 3 of 3 calculated diagram(s): 300–3999.18 K, x(Si) 1–1
Literature: 4 values (4 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:hf-si:a4-diamond, corpus:phase:hf-si:diamond-a4
paper: paper:10.1016/s0966-9795(03)00021-9:(Si), paper:10.1361/105497100770340408:diamond_A4 (Si)
tdb: tdb:HfSi-00Zha-LB.tdb:DIAMOND_A4, tdb:HfSi-03Yan.tdb:DIAMOND_A4, tdb:HfSi-19Hon.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (3): PHASE and CONSTITUENT statements as written

HfSi-00Zha-LB.tdb: DIAMOND_A4, type code %, sha256 29edae6cd520ee5e…

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

HfSi-03Yan.tdb: DIAMOND_A4, type code %, sha256 4c947308a5e5f90e…

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

HfSi-19Hon.tdb: DIAMOND_A4, type code %, sha256 6640e20000baa136…

48: PHASE DIAMOND_A4 % 1 1 !
49: CONST DIAMOND_A4 : SI : !

Example references (3 of 3; assessments first):

doi:10.1016/S0966-9795(03)00021-9 Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003).
assessment that models this phase; reports values for this phase
doi:10.1361/105497100770340408 J. -C. Zhao, B. P. Bewlay, M. R. Jackson, Q. Chen, Hf-Si binary phase diagram determination and thermodynamic modeling, JPE 21, 40-45 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.actamat.2018.11.007 P. Honarmandi, T.C. Duong, S.F. Ghoreishi, D. Allaire, R. Arroyave, Acta Mater., 164, 636-47(2019).
assessment that models this phase

BCC_A2 (Hf–Si)

Id: phase:hf-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: stable in 3 of 3 calculated diagram(s): 2013.35–2548.99 K, x(Si) 0–0.00211
Literature: 6 values (6 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:hf-si:bcc-a2
paper: paper:10.1016/s0966-9795(03)00021-9:bcc(Hf), paper:10.1361/105497100770340408:Bcc (Hf), paper:10.1361/105497100770340408:bcc (Hf)
tdb: tdb:HfSi-00Zha-LB.tdb:BCC_A2, tdb:HfSi-03Yan.tdb:BCC_A2, tdb:HfSi-19Hon.tdb:BCC_A2

TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written

HfSi-00Zha-LB.tdb: BCC_A2, type code %B, sha256 29edae6cd520ee5e…

31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : HF SI : VA : !

HfSi-03Yan.tdb: BCC_A2, type code %B, sha256 4c947308a5e5f90e…

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

HfSi-19Hon.tdb: BCC_A2, type code %B, sha256 6640e20000baa136…

38: PHASE BCC_A2 %B 2 1 3 !
39: CONST BCC_A2 : HF SI : VA : !

Example references (3 of 3; assessments first):

doi:10.1361/105497100770340408 J. -C. Zhao, B. P. Bewlay, M. R. Jackson, Q. Chen, Hf-Si binary phase diagram determination and thermodynamic modeling, JPE 21, 40-45 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/S0966-9795(03)00021-9 Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003).
assessment that models this phase; reports values for this phase
doi:10.1016/j.actamat.2018.11.007 P. Honarmandi, T.C. Duong, S.F. Ghoreishi, D. Allaire, R. Arroyave, Acta Mater., 164, 636-47(2019).
assessment that models this phase

FCC_A1 (Hf–Si)

Id: phase:hf-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 3 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:hf-si:fcc-a1
tdb: tdb:HfSi-00Zha-LB.tdb:FCC_A1, tdb:HfSi-03Yan.tdb:FCC_A1, tdb:HfSi-19Hon.tdb:FCC_A1

TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written

HfSi-00Zha-LB.tdb: FCC_A1, type code %A, sha256 29edae6cd520ee5e…

26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : HF SI : VA : !

HfSi-03Yan.tdb: FCC_A1, type code %A, sha256 4c947308a5e5f90e…

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

HfSi-19Hon.tdb: FCC_A1, type code %A, sha256 6640e20000baa136…

33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : HF SI : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.actamat.2018.11.007 P. Honarmandi, T.C. Duong, S.F. Ghoreishi, D. Allaire, R. Arroyave, Acta Mater., 164, 636-47(2019).
assessment that models this phase
doi:10.1016/S0966-9795(03)00021-9 Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003).
assessment that models this phase
doi:10.1361/105497100770340408 J. -C. Zhao, B. P. Bewlay, M. R. Jackson, Q. Chen, Hf-Si binary phase diagram determination and thermodynamic modeling, JPE 21, 40-45 (2000).
assessment that models this phase

HCP_A3 (Hf–Si)

Id: phase:hf-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 3 of 3 calculated diagram(s): 300–2016.03 K, x(Si) 0–0.00067
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:hf-si:hcp-a3
paper: paper:10.1361/105497100770340408:hcp (Hf)
tdb: tdb:HfSi-00Zha-LB.tdb:HCP_A3, tdb:HfSi-03Yan.tdb:HCP_A3, tdb:HfSi-19Hon.tdb:HCP_A3

TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written

HfSi-00Zha-LB.tdb: HCP_A3, type code %, sha256 29edae6cd520ee5e…

36: PHASE HCP_A3 % 2 1 0.5 !
37: CONST HCP_A3 : HF SI : VA : !

HfSi-03Yan.tdb: HCP_A3, type code %, sha256 4c947308a5e5f90e…

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

HfSi-19Hon.tdb: HCP_A3, type code %, sha256 6640e20000baa136…

43: PHASE HCP_A3 % 2 1 0.5 !
44: CONST HCP_A3 : HF SI : VA : !

Example references (3 of 3; assessments first):

doi:10.1361/105497100770340408 J. -C. Zhao, B. P. Bewlay, M. R. Jackson, Q. Chen, Hf-Si binary phase diagram determination and thermodynamic modeling, JPE 21, 40-45 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.actamat.2018.11.007 P. Honarmandi, T.C. Duong, S.F. Ghoreishi, D. Allaire, R. Arroyave, Acta Mater., 164, 636-47(2019).
assessment that models this phase
doi:10.1016/S0966-9795(03)00021-9 Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003).
assessment that models this phase

HF2SI_C16 (Hf–Si)

Id: phase:hf-si:hf2si-c16; status assigned
Structure: Al2Cu · C16 · tI12 · I4/mcm (140); type st:c16-al2cu-ti12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaosg and oqmd-7793, space group 140
Stoichiometry: Hf 0.6667, Si 0.3333
Stability: stable in 3 of 3 calculated diagram(s): 300–2365.31 K, x(Si) 0.33333–0.33333
Literature: 15 values (15 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:hf-si:hf2si-c16
mp: mp:mp-aaaaaosg
oqmd: oqmd:oqmd-7793
paper: paper:10.1016/s0966-9795(03)00021-9:Hf2Si, paper:10.1361/105497100770340408:Hf2Si
tdb: tdb:HfSi-00Zha-LB.tdb:HF2SI_C16, tdb:HfSi-03Yan.tdb:HF2SI_C16, tdb:HfSi-19Hon.tdb:HF2SI_C16

TDB models of HF2SI_C16 (3): PHASE and CONSTITUENT statements as written

HfSi-00Zha-LB.tdb: HF2SI_C16, type code %, sha256 29edae6cd520ee5e…

46: PHASE HF2SI_C16 % 2 2 1 !
47: CONST HF2SI_C16 : HF : SI : !

HfSi-03Yan.tdb: HF2SI_C16, type code %, sha256 4c947308a5e5f90e…

48: PHASE HF2SI_C16 % 2 2 1 !
49: CONST HF2SI_C16 : HF : SI : !

HfSi-19Hon.tdb: HF2SI_C16, type code %, sha256 6640e20000baa136…

53: PHASE HF2SI_C16 % 2 2 1 !
54: CONST HF2SI_C16 : HF : SI : !

Example references (3 of 3; assessments first):

doi:10.1361/105497100770340408 J. -C. Zhao, B. P. Bewlay, M. R. Jackson, Q. Chen, Hf-Si binary phase diagram determination and thermodynamic modeling, JPE 21, 40-45 (2000).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(03)00021-9 Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003).
assessment that models this phase; reports values for this phase
doi:10.1016/j.actamat.2018.11.007 P. Honarmandi, T.C. Duong, S.F. Ghoreishi, D. Allaire, R. Arroyave, Acta Mater., 164, 636-47(2019).
assessment that models this phase

HF3SI2_D5A (Hf–Si)

Id: phase:hf-si:hf3si2-d5a; status assigned
Structure: Si2U3 · D5_a · tP10 · P4/mbm (127); type st:d5-a-si2u3-tp10; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaadcz and oqmd-647083, space group 127
Stoichiometry: Hf 0.6000, Si 0.4000
Stability: stable in 3 of 3 calculated diagram(s): 300–2752.96 K, x(Si) 0.4–0.4
Literature: 16 values (16 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:hf-si:hf3si2-d5a
mp: mp:mp-aaaaadcz
oqmd: oqmd:oqmd-647083
paper: paper:10.1016/s0966-9795(03)00021-9:Hf3Si2, paper:10.1361/105497100770340408:Hf3Si2
tdb: tdb:HfSi-00Zha-LB.tdb:HF3SI2_D5A, tdb:HfSi-03Yan.tdb:HF3SI2_D5A, tdb:HfSi-19Hon.tdb:HF3SI2_D5A

TDB models of HF3SI2_D5A (3): PHASE and CONSTITUENT statements as written

HfSi-00Zha-LB.tdb: HF3SI2_D5A, type code %, sha256 29edae6cd520ee5e…

56: PHASE HF3SI2_D5A % 2 3 2 !
57: CONST HF3SI2_D5A : HF : SI : !

HfSi-03Yan.tdb: HF3SI2_D5A, type code %, sha256 4c947308a5e5f90e…

58: PHASE HF3SI2_D5A % 2 3 2 !
59: CONST HF3SI2_D5A : HF : SI : !

HfSi-19Hon.tdb: HF3SI2_D5A, type code %, sha256 6640e20000baa136…

63: PHASE HF3SI2_D5A % 2 3 2 !
64: CONST HF3SI2_D5A : HF : SI : !

Example references (3 of 3; assessments first):

doi:10.1016/S0966-9795(03)00021-9 Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003).
assessment that models this phase; reports values for this phase
doi:10.1361/105497100770340408 J. -C. Zhao, B. P. Bewlay, M. R. Jackson, Q. Chen, Hf-Si binary phase diagram determination and thermodynamic modeling, JPE 21, 40-45 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.actamat.2018.11.007 P. Honarmandi, T.C. Duong, S.F. Ghoreishi, D. Allaire, R. Arroyave, Acta Mater., 164, 636-47(2019).
assessment that models this phase

HF5SI3_D88 (Hf–Si)

Id: phase:hf-si:hf5si3-d88; status assigned
Structure: Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193); type st:d8-8-mn5si3-hp16; tier A: standard phase name; confidence high
Stoichiometry: Hf 0.6250, Si 0.3750
Stability: stable in 3 of 3 calculated diagram(s): 1816.93–2740.16 K, x(Si) 0.375–0.375
Literature: 13 values (13 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:hf-si:hf5si3-d88
paper: paper:10.1016/s0966-9795(03)00021-9:Hf5Si3, paper:10.1361/105497100770340408:Hf5Si3
tdb: tdb:HfSi-00Zha-LB.tdb:HF5SI3_D88, tdb:HfSi-03Yan.tdb:HF5SI3_D88, tdb:HfSi-19Hon.tdb:HF5SI3_D88

TDB models of HF5SI3_D88 (3): PHASE and CONSTITUENT statements as written

HfSi-00Zha-LB.tdb: HF5SI3_D88, type code %, sha256 29edae6cd520ee5e…

51: PHASE HF5SI3_D88 % 2 5 3 !
52: CONST HF5SI3_D88 : HF : SI : !

HfSi-03Yan.tdb: HF5SI3_D88, type code %, sha256 4c947308a5e5f90e…

53: PHASE HF5SI3_D88 % 2 5 3 !
54: CONST HF5SI3_D88 : HF : SI : !

HfSi-19Hon.tdb: HF5SI3_D88, type code %, sha256 6640e20000baa136…

58: PHASE HF5SI3_D88 % 2 5 3 !
59: CONST HF5SI3_D88 : HF : SI : !

Example references (3 of 3; assessments first):

doi:10.1016/S0966-9795(03)00021-9 Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003).
assessment that models this phase; reports values for this phase
doi:10.1361/105497100770340408 J. -C. Zhao, B. P. Bewlay, M. R. Jackson, Q. Chen, Hf-Si binary phase diagram determination and thermodynamic modeling, JPE 21, 40-45 (2000).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.actamat.2018.11.007 P. Honarmandi, T.C. Duong, S.F. Ghoreishi, D. Allaire, R. Arroyave, Acta Mater., 164, 636-47(2019).
assessment that models this phase

HF5SI4 (Hf–Si)

Id: phase:hf-si:hf5si4; status assigned
Structure: Si4Zr5 · tP36 · P4_12_12 (92); type st:si4zr5-tp36; 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: Hf 0.5556, Si 0.4444
Stability: stable in 3 of 3 calculated diagram(s): 300–2595.12 K, x(Si) 0.44444–0.44444
Literature: 10 values (10 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:hf-si:hf5si4
paper: paper:10.1016/s0966-9795(03)00021-9:Hf5Si4, paper:10.1361/105497100770340408:Hf5Si4
tdb: tdb:HfSi-00Zha-LB.tdb:HF5SI4, tdb:HfSi-03Yan.tdb:HF5SI4, tdb:HfSi-19Hon.tdb:HF5SI4

TDB models of HF5SI4 (3): PHASE and CONSTITUENT statements as written

HfSi-00Zha-LB.tdb: HF5SI4, type code %, sha256 29edae6cd520ee5e…

61: PHASE HF5SI4 % 2 5 4 !
62: CONST HF5SI4 : HF : SI : !

HfSi-03Yan.tdb: HF5SI4, type code %, sha256 4c947308a5e5f90e…

63: PHASE HF5SI4 % 2 5 4 !
64: CONST HF5SI4 : HF : SI : !

HfSi-19Hon.tdb: HF5SI4, type code %, sha256 6640e20000baa136…

68: PHASE HF5SI4 % 2 5 4 !
69: CONST HF5SI4 : HF : SI : !

Example references (3 of 3; assessments first):

doi:10.1361/105497100770340408 J. -C. Zhao, B. P. Bewlay, M. R. Jackson, Q. Chen, Hf-Si binary phase diagram determination and thermodynamic modeling, JPE 21, 40-45 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/S0966-9795(03)00021-9 Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003).
assessment that models this phase; reports values for this phase
doi:10.1016/j.actamat.2018.11.007 P. Honarmandi, T.C. Duong, S.F. Ghoreishi, D. Allaire, R. Arroyave, Acta Mater., 164, 636-47(2019).
assessment that models this phase

HFSI_B27 (Hf–Si)

Id: phase:hf-si:hfsi-b27; status assigned
Structure: FeB · B27 · oP8 · Pnma (62); type st:b27-feb-op8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaboc and oqmd-647082, space group 62
Stoichiometry: Hf 0.5000, Si 0.5000
Stability: stable in 3 of 3 calculated diagram(s): 300–2416.93 K, x(Si) 0.5–0.5
Literature: 8 values (8 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:hf-si:hfsi-b27
mp: mp:mp-aaaaaboc
oqmd: oqmd:oqmd-647082
paper: paper:10.1016/s0966-9795(03)00021-9:HfSi, paper:10.1361/105497100770340408:HfSi
tdb: tdb:HfSi-00Zha-LB.tdb:HFSI_B27, tdb:HfSi-03Yan.tdb:HFSI_B27, tdb:HfSi-19Hon.tdb:HFSI_B27

TDB models of HFSI_B27 (3): PHASE and CONSTITUENT statements as written

HfSi-00Zha-LB.tdb: HFSI_B27, type code %, sha256 29edae6cd520ee5e…

66: PHASE HFSI_B27 % 2 1 1 !
67: CONST HFSI_B27 : HF : SI : !

HfSi-03Yan.tdb: HFSI_B27, type code %, sha256 4c947308a5e5f90e…

68: PHASE HFSI_B27 % 2 1 1 !
69: CONST HFSI_B27 : HF : SI : !

HfSi-19Hon.tdb: HFSI_B27, type code %, sha256 6640e20000baa136…

73: PHASE HFSI_B27 % 2 1 1 !
74: CONST HFSI_B27 : HF : SI : !

Example references (3 of 3; assessments first):

doi:10.1016/S0966-9795(03)00021-9 Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003).
assessment that models this phase; reports values for this phase
doi:10.1361/105497100770340408 J. -C. Zhao, B. P. Bewlay, M. R. Jackson, Q. Chen, Hf-Si binary phase diagram determination and thermodynamic modeling, JPE 21, 40-45 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.actamat.2018.11.007 P. Honarmandi, T.C. Duong, S.F. Ghoreishi, D. Allaire, R. Arroyave, Acta Mater., 164, 636-47(2019).
assessment that models this phase

HFSI2_C49 (Hf–Si)

Id: phase:hf-si:hfsi2-c49; status assigned
Structure: ZrSi2 · C49 · oC12 · Cmcm (63); type st:c49-zrsi2-oc12; tier A: standard phase name; confidence high
Stoichiometry: Hf 0.3333, Si 0.6667
Stability: stable in 3 of 3 calculated diagram(s): 300–1818.85 K, x(Si) 0.66667–0.66667
Literature: 8 values (8 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:hf-si:hfsi2-c49
paper: paper:10.1016/s0966-9795(03)00021-9:HfSi2, paper:10.1361/105497100770340408:HfSi2
tdb: tdb:HfSi-00Zha-LB.tdb:HFSI2_C49, tdb:HfSi-03Yan.tdb:HFSI2_C49, tdb:HfSi-19Hon.tdb:HFSI2_C49

TDB models of HFSI2_C49 (3): PHASE and CONSTITUENT statements as written

HfSi-00Zha-LB.tdb: HFSI2_C49, type code %, sha256 29edae6cd520ee5e…

71: PHASE HFSI2_C49 % 2 1 2 !
72: CONST HFSI2_C49 : HF : SI : !

HfSi-03Yan.tdb: HFSI2_C49, type code %, sha256 4c947308a5e5f90e…

73: PHASE HFSI2_C49 % 2 1 2 !
74: CONST HFSI2_C49 : HF : SI : !

HfSi-19Hon.tdb: HFSI2_C49, type code %, sha256 6640e20000baa136…

78: PHASE HFSI2_C49 % 2 1 2 !
79: CONST HFSI2_C49 : HF : SI : !

Example references (3 of 3; assessments first):

doi:10.1016/S0966-9795(03)00021-9 Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003).
assessment that models this phase; reports values for this phase
doi:10.1361/105497100770340408 J. -C. Zhao, B. P. Bewlay, M. R. Jackson, Q. Chen, Hf-Si binary phase diagram determination and thermodynamic modeling, JPE 21, 40-45 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.actamat.2018.11.007 P. Honarmandi, T.C. Duong, S.F. Ghoreishi, D. Allaire, R. Arroyave, Acta Mater., 164, 636-47(2019).
assessment that models this phase

LIQUID (Hf–Si)

Id: phase:hf-si:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 1597.92–4000 K, x(Si) 0–1
Literature: 33 values (33 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:hf-si:liquid
paper: paper:10.1016/s0966-9795(03)00021-9:L, paper:10.1361/105497100770340408:L
tdb: tdb:HfSi-00Zha-LB.tdb:LIQUID, tdb:HfSi-03Yan.tdb:LIQUID, tdb:HfSi-19Hon.tdb:LIQUID

TDB models of LIQUID (3): PHASE and CONSTITUENT statements as written

HfSi-00Zha-LB.tdb: LIQUID, type code %, sha256 29edae6cd520ee5e…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : HF SI : !

HfSi-03Yan.tdb: LIQUID, type code %, sha256 4c947308a5e5f90e…

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

HfSi-19Hon.tdb: LIQUID, type code %, sha256 6640e20000baa136…

28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : HF SI : !

Example references (3 of 3; assessments first):

doi:10.1016/S0966-9795(03)00021-9 Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003).
assessment that models this phase; reports values for this phase
doi:10.1361/105497100770340408 J. -C. Zhao, B. P. Bewlay, M. R. Jackson, Q. Chen, Hf-Si binary phase diagram determination and thermodynamic modeling, JPE 21, 40-45 (2000).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.actamat.2018.11.007 P. Honarmandi, T.C. Duong, S.F. Ghoreishi, D. Allaire, R. Arroyave, Acta Mater., 164, 636-47(2019).
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}
}