Nb–Si phases

12 phases (tier A 7, tier C 3, liquid 1, needs_review 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 · Nb–Si system page · Markdown · field reference

Phases of the Nb–Si system (12)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
DIAMOND_A4 phase:nb-si:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	stable in 11 of 11 calculated diagram(s): 300–3999.73 K, x(Si) 1–1	11	11
BCC_A2 phase:nb-si:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 11 of 11 calculated diagram(s): 300–2779.92 K, x(Si) 0–0.03865	31	11
MSI2_C40 phase:nb-si:c40-msi2	CrSi2 · C40 · hP9 · P6_222 (180)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–2234.49 K, x(Si) 0.66667–0.66667	0	2
M5SI3_D8M phase:nb-si:d8m-m5si3	W5Si3 · D8_m · tI32 · I4/mcm (140)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 1906.77–2798.06 K, x(Si) 0.37508–0.40798	0	2
FCC_A1 phase:nb-si:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 11 calculated diagram(s)	0	11
HCP_A3 phase:nb-si:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 11 calculated diagram(s)	0	11
LIQUID phase:nb-si:liquid	liquid	liquid	stable in 11 of 11 calculated diagram(s): 1662.23–4000 K, x(Si) 0–1	80	11
NB3SI phase:nb-si:nb3si	Ti3P · tP32 · P4_2/n (86)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 11 of 11 calculated diagram(s): 1940–2270 K, x(Si) 0.25–0.25	81	11
NB5SI3 phase:nb-si:nb5si3		needs_review	stable in 1 of 1 calculated diagram(s): 300–2760.97 K, x(Si) 0.375–0.375	23	1
NB5SI3_D8L phase:nb-si:nb5si3-d8l	Cr5B3 · D8_l · tI32 · I4/mcm (140)	tier A: standard phase name	stable in 10 of 10 calculated diagram(s): 300–2219.76 K, x(Si) 0.375–0.38215	27	10
NB5SI3_D8M phase:nb-si:nb5si3-d8m	W5Si3 · D8_m · tI32 · I4/mcm (140)	tier A: standard phase name	stable in 8 of 8 calculated diagram(s): 1914.75–2805.15 K, x(Si) 0.37502–0.40814	60	8
NBSI2_C40 phase:nb-si:nbsi2-c40	CrSi2 · C40 · hP9 · P6_222 (180)	tier A: standard phase name	stable in 9 of 9 calculated diagram(s): 300–2236.14 K, x(Si) 0.66667–0.66826	57	9

DIAMOND_A4 (Nb–Si)

Id: phase:nb-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 11 of 11 calculated diagram(s): 300–3999.73 K, x(Si) 1–1
Literature: 11 values (11 accepted) from 3 papers
Interactive: phase registry entry

Names (16): corpus: corpus:phase:nb-si:a4-diamond, corpus:phase:nb-si:diamond-a4
paper: paper:10.1016/j.intermet.2005.08.013:(Si), paper:10.1016/s0966-9795(03)00021-9:(Si), paper:10.1016/s0966-9795(98)00073-9:(Si)
tdb: tdb:NbSi-02Fer-alt.tdb:DIAMOND_A4, tdb:NbSi-02Fer.tdb:DIAMOND_A4, tdb:NbSi-03Yan.tdb:DIAMOND_A4, tdb:NbSi-04Sha.tdb:DIAMOND_A4, tdb:NbSi-06Dav.tdb:DIAMOND_A4, tdb:NbSi-09Gen.tdb:DIAMOND_A4, tdb:NbSi-10Gen.tdb:DIAMOND_A4, tdb:NbSi-13Li.tdb:DIAMOND_A4, tdb:NbSi-16Jac.tdb:DIAMOND_A4, tdb:NbSi-17Jac.tdb:DIAMOND_A4, tdb:NbSi-99Lia.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (11): PHASE and CONSTITUENT statements as written

NbSi-02Fer-alt.tdb: DIAMOND_A4, type code %, sha256 8dad947189abee9d…

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

NbSi-02Fer.tdb: DIAMOND_A4, type code %, sha256 9feec68a8a1d936a…

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

NbSi-03Yan.tdb: DIAMOND_A4, type code %, sha256 d0927671fb32f539…

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

NbSi-04Sha.tdb: DIAMOND_A4, type code %, sha256 025b4cfcca64b229…

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

NbSi-06Dav.tdb: DIAMOND_A4, type code %, sha256 4b08671f6aca1fa7…

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

NbSi-09Gen.tdb: DIAMOND_A4, type code %, sha256 b11d9c4dae1a0e23…

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

NbSi-10Gen.tdb: DIAMOND_A4, type code %, sha256 e5e7beb9629a351a…

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

NbSi-13Li.tdb: DIAMOND_A4, type code %, sha256 1f452b276f51d19f…

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

NbSi-16Jac.tdb: DIAMOND_A4, type code %, sha256 684fbb477b2e39d4…

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

NbSi-17Jac.tdb: DIAMOND_A4, type code %, sha256 9de41d5e8d379706…

45: PHASE DIAMOND_A4 % 1 1 !
46: CONST DIAMOND_A4 : SI : !

NbSi-99Lia.tdb: DIAMOND_A4, type code %, sha256 e706c2b5c4734dec…

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

Example references (10 of 11; assessments first):

doi:10.1016/j.intermet.2005.08.013 N. David, Y. Cartigny, T. Belmonte, J.M. Fiorani, M. Vilasi, Thermodynamic description of the Cr–Nb–Si isothermal section at 1473K, Intermetallics 14, 464-473 (2006).
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; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(98)00073-9 H. Liang, Y.A. Chang, Intermetallics, 7, 561-70(1999).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.intermet.2004.03.011 G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/S0966-9795(02)00125-5 P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Intermetallics, 10, 993-99(2002).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.calphad.2010.07.003 Tai Geng, Changrong Li, Xinqing Zhao, Huibin Xu, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Mo system, Calphad 34, 363-376 (2010).
assessment that models this phase
doi:10.1016/j.calphad.2013.04.004 Yan Li, Changrong Li, Zhenmin Du, Cuiping Guo, Thermodynamic optimization of the Nb–Si–W ternary system, Calphad 43, 112-123 (2013).
assessment that models this phase
doi:10.1016/j.calphad.2016.04.013 A. Jacob, C. Schmetterer, A. Khvan, A. Kondratiev, D. Ivanov, B. Hallstedt, Liquidus projection and thermodynamic modeling of the Cr-Fe-Nb ternary system, Calphad 54 (2016) 1–15, doi:10.1016/j.calphad.2016.04.013.
assessment that models this phase
doi:10.1016/j.calphad.2016.12.002 A. Jacob, E. Povoden-Karadeniz, E. Kozeschnik, Calphad, 56, 80-91(2017).
assessment that models this phase
doi:10.1016/j.intermet.2008.11.011 Tai Geng, Changrong Li, Jing Bao, Xinqing Zhao, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Ti system, Intermetallics 17, 343-357 (2009).
assessment that models this phase

BCC_A2 (Nb–Si)

Id: phase:nb-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 11 of 11 calculated diagram(s): 300–2779.92 K, x(Si) 0–0.03865
Literature: 31 values (30 accepted) from 4 papers
Interactive: phase registry entry

Names (16): corpus: corpus:phase:nb-si:bcc-a2
paper: paper:10.1016/j.intermet.2004.03.011:(Nb), paper:10.1016/j.intermet.2005.08.013:(Nb), paper:10.1016/s0966-9795(03)00021-9:β(Nb,Si), paper:10.1016/s0966-9795(98)00073-9:(Nb)
tdb: tdb:NbSi-02Fer-alt.tdb:BCC_A2, tdb:NbSi-02Fer.tdb:BCC_A2, tdb:NbSi-03Yan.tdb:BCC_A2, tdb:NbSi-04Sha.tdb:BCC_A2, tdb:NbSi-06Dav.tdb:BCC_A2, tdb:NbSi-09Gen.tdb:BCC_A2, tdb:NbSi-10Gen.tdb:BCC_A2, tdb:NbSi-13Li.tdb:BCC_A2, tdb:NbSi-16Jac.tdb:BCC_A2, tdb:NbSi-17Jac.tdb:BCC_A2, tdb:NbSi-99Lia.tdb:BCC_A2

TDB models of BCC_A2 (11): PHASE and CONSTITUENT statements as written

NbSi-02Fer-alt.tdb: BCC_A2, type code %B, sha256 8dad947189abee9d…

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

NbSi-02Fer.tdb: BCC_A2, type code %B, sha256 9feec68a8a1d936a…

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

NbSi-03Yan.tdb: BCC_A2, type code %B, sha256 d0927671fb32f539…

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

NbSi-04Sha.tdb: BCC_A2, type code %B, sha256 025b4cfcca64b229…

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

NbSi-06Dav.tdb: BCC_A2, type code %B, sha256 4b08671f6aca1fa7…

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

NbSi-09Gen.tdb: BCC_A2, type code %B, sha256 b11d9c4dae1a0e23…

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

NbSi-10Gen.tdb: BCC_A2, type code %B, sha256 e5e7beb9629a351a…

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

NbSi-13Li.tdb: BCC_A2, type code %B, sha256 1f452b276f51d19f…

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

NbSi-16Jac.tdb: BCC_A2, type code %B, sha256 684fbb477b2e39d4…

39: PHASE BCC_A2 %B 2 1 3 !
40: CONST BCC_A2 : NB% SI : VA : !

NbSi-17Jac.tdb: BCC_A2, type code %B, sha256 9de41d5e8d379706…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : NB% SI : VA : !

NbSi-99Lia.tdb: BCC_A2, type code %B, sha256 e706c2b5c4734dec…

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

Example references (10 of 12; assessments first):

doi:10.1016/j.intermet.2005.08.013 N. David, Y. Cartigny, T. Belmonte, J.M. Fiorani, M. Vilasi, Thermodynamic description of the Cr–Nb–Si isothermal section at 1473K, Intermetallics 14, 464-473 (2006).
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; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.intermet.2004.03.011 G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(98)00073-9 H. Liang, Y.A. Chang, Intermetallics, 7, 561-70(1999).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(02)00125-5 P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Intermetallics, 10, 993-99(2002).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.calphad.2010.07.003 Tai Geng, Changrong Li, Xinqing Zhao, Huibin Xu, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Mo system, Calphad 34, 363-376 (2010).
assessment that models this phase
doi:10.1016/j.calphad.2013.04.004 Yan Li, Changrong Li, Zhenmin Du, Cuiping Guo, Thermodynamic optimization of the Nb–Si–W ternary system, Calphad 43, 112-123 (2013).
assessment that models this phase
doi:10.1016/j.calphad.2016.04.013 A. Jacob, C. Schmetterer, A. Khvan, A. Kondratiev, D. Ivanov, B. Hallstedt, Liquidus projection and thermodynamic modeling of the Cr-Fe-Nb ternary system, Calphad 54 (2016) 1–15, doi:10.1016/j.calphad.2016.04.013.
assessment that models this phase
doi:10.1016/j.calphad.2016.12.002 A. Jacob, E. Povoden-Karadeniz, E. Kozeschnik, Calphad, 56, 80-91(2017).
assessment that models this phase
doi:10.1016/j.intermet.2008.11.011 Tai Geng, Changrong Li, Jing Bao, Xinqing Zhao, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Ti system, Intermetallics 17, 343-357 (2009).
assessment that models this phase

MSI2_C40 (Nb–Si)

Id: phase:nb-si:c40-msi2; status assigned
Structure: CrSi2 · C40 · hP9 · P6_222 (180); type st:c40-crsi2-hp9; 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 (unrecognised_name_tokens:MSI2); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 2 of 2 calculated diagram(s): 300–2234.49 K, x(Si) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:nb-si:c40-msi2
tdb: tdb:NbSi-16Jac.tdb:MSI2_C40, tdb:NbSi-17Jac.tdb:MSI2_C40

TDB models of MSI2_C40 (2): PHASE and CONSTITUENT statements as written

NbSi-16Jac.tdb: MSI2_C40, type code %, sha256 684fbb477b2e39d4…

69: PHASE MSI2_C40 % 2 1 2 !
70: CONST MSI2_C40 : NB% SI : SI : !

NbSi-17Jac.tdb: MSI2_C40, type code %, sha256 9de41d5e8d379706…

65: PHASE MSI2_C40 % 2 1 2 !
66: CONST MSI2_C40 : NB% SI : SI : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2016.04.013 A. Jacob, C. Schmetterer, A. Khvan, A. Kondratiev, D. Ivanov, B. Hallstedt, Liquidus projection and thermodynamic modeling of the Cr-Fe-Nb ternary system, Calphad 54 (2016) 1–15, doi:10.1016/j.calphad.2016.04.013.
assessment that models this phase
doi:10.1016/j.calphad.2016.12.002 A. Jacob, E. Povoden-Karadeniz, E. Kozeschnik, Calphad, 56, 80-91(2017).
assessment that models this phase

M5SI3_D8M (Nb–Si)

Id: phase:nb-si:d8m-m5si3; status assigned
Structure: W5Si3 · D8_m · tI32 · I4/mcm (140); type st:d8-m-w5si3-ti32; 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 (unrecognised_name_tokens:M5SI3); structure as stated in the SGTE crystallographic table for this phase name and system
Caveat: partitioned order/disorder model in NbSi-17Jac.tdb also describes the disordered state
Stability: stable in 2 of 2 calculated diagram(s): 1906.77–2798.06 K, x(Si) 0.37508–0.40798
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:nb-si:d8m-m5si3
tdb: tdb:NbSi-16Jac.tdb:M5SI3_D8M, tdb:NbSi-17Jac.tdb:M5SI3_D8M

TDB models of M5SI3_D8M (2): PHASE and CONSTITUENT statements as written

NbSi-16Jac.tdb: M5SI3_D8M, type code %, sha256 684fbb477b2e39d4…

64: PHASE M5SI3_D8M % 3 4 1 3 !
65: CONST M5SI3_D8M : NB : NB SI : SI : !

NbSi-17Jac.tdb: M5SI3_D8M, type code %, sha256 9de41d5e8d379706…

60: PHASE M5SI3_D8M % 3 4 1 3 !
61: CONST M5SI3_D8M : NB : NB SI : NB SI% : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2016.04.013 A. Jacob, C. Schmetterer, A. Khvan, A. Kondratiev, D. Ivanov, B. Hallstedt, Liquidus projection and thermodynamic modeling of the Cr-Fe-Nb ternary system, Calphad 54 (2016) 1–15, doi:10.1016/j.calphad.2016.04.013.
assessment that models this phase
doi:10.1016/j.calphad.2016.12.002 A. Jacob, E. Povoden-Karadeniz, E. Kozeschnik, Calphad, 56, 80-91(2017).
assessment that models this phase

FCC_A1 (Nb–Si)

Id: phase:nb-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 11 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (12): corpus: corpus:phase:nb-si:fcc-a1
tdb: tdb:NbSi-02Fer-alt.tdb:FCC_A1, tdb:NbSi-02Fer.tdb:FCC_A1, tdb:NbSi-03Yan.tdb:FCC_A1, tdb:NbSi-04Sha.tdb:FCC_A1, tdb:NbSi-06Dav.tdb:FCC_A1, tdb:NbSi-09Gen.tdb:FCC_A1, tdb:NbSi-10Gen.tdb:FCC_A1, tdb:NbSi-13Li.tdb:FCC_A1, tdb:NbSi-16Jac.tdb:FCC_A1, tdb:NbSi-17Jac.tdb:FCC_A1, tdb:NbSi-99Lia.tdb:FCC_A1

TDB models of FCC_A1 (11): PHASE and CONSTITUENT statements as written

NbSi-02Fer-alt.tdb: FCC_A1, type code %A, sha256 8dad947189abee9d…

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

NbSi-02Fer.tdb: FCC_A1, type code %A, sha256 9feec68a8a1d936a…

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

NbSi-03Yan.tdb: FCC_A1, type code %A, sha256 d0927671fb32f539…

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

NbSi-04Sha.tdb: FCC_A1, type code %A, sha256 025b4cfcca64b229…

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

NbSi-06Dav.tdb: FCC_A1, type code %A, sha256 4b08671f6aca1fa7…

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

NbSi-09Gen.tdb: FCC_A1, type code %A, sha256 b11d9c4dae1a0e23…

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

NbSi-10Gen.tdb: FCC_A1, type code %A, sha256 e5e7beb9629a351a…

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

NbSi-13Li.tdb: FCC_A1, type code %A, sha256 1f452b276f51d19f…

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

NbSi-16Jac.tdb: FCC_A1, type code %A, sha256 684fbb477b2e39d4…

34: PHASE FCC_A1 %A 2 1 1 !
35: CONST FCC_A1 : NB SI : VA : !

NbSi-17Jac.tdb: FCC_A1, type code %A, sha256 9de41d5e8d379706…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : NB SI : VA : !

NbSi-99Lia.tdb: FCC_A1, type code %A, sha256 e706c2b5c4734dec…

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

Example references (10 of 10; assessments first):

doi:10.1016/j.calphad.2010.07.003 Tai Geng, Changrong Li, Xinqing Zhao, Huibin Xu, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Mo system, Calphad 34, 363-376 (2010).
assessment that models this phase
doi:10.1016/j.calphad.2013.04.004 Yan Li, Changrong Li, Zhenmin Du, Cuiping Guo, Thermodynamic optimization of the Nb–Si–W ternary system, Calphad 43, 112-123 (2013).
assessment that models this phase
doi:10.1016/j.calphad.2016.04.013 A. Jacob, C. Schmetterer, A. Khvan, A. Kondratiev, D. Ivanov, B. Hallstedt, Liquidus projection and thermodynamic modeling of the Cr-Fe-Nb ternary system, Calphad 54 (2016) 1–15, doi:10.1016/j.calphad.2016.04.013.
assessment that models this phase
doi:10.1016/j.calphad.2016.12.002 A. Jacob, E. Povoden-Karadeniz, E. Kozeschnik, Calphad, 56, 80-91(2017).
assessment that models this phase
doi:10.1016/j.intermet.2004.03.011 G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004).
assessment that models this phase
doi:10.1016/j.intermet.2005.08.013 N. David, Y. Cartigny, T. Belmonte, J.M. Fiorani, M. Vilasi, Thermodynamic description of the Cr–Nb–Si isothermal section at 1473K, Intermetallics 14, 464-473 (2006).
assessment that models this phase
doi:10.1016/j.intermet.2008.11.011 Tai Geng, Changrong Li, Jing Bao, Xinqing Zhao, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Ti system, Intermetallics 17, 343-357 (2009).
assessment that models this phase
doi:10.1016/S0966-9795(02)00125-5 P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Intermetallics, 10, 993-99(2002).
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:10.1016/S0966-9795(98)00073-9 H. Liang, Y.A. Chang, Intermetallics, 7, 561-70(1999).
assessment that models this phase

HCP_A3 (Nb–Si)

Id: phase:nb-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 11 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (12): corpus: corpus:phase:nb-si:hcp-a3
tdb: tdb:NbSi-02Fer-alt.tdb:HCP_A3, tdb:NbSi-02Fer.tdb:HCP_A3, tdb:NbSi-03Yan.tdb:HCP_A3, tdb:NbSi-04Sha.tdb:HCP_A3, tdb:NbSi-06Dav.tdb:HCP_A3, tdb:NbSi-09Gen.tdb:HCP_A3, tdb:NbSi-10Gen.tdb:HCP_A3, tdb:NbSi-13Li.tdb:HCP_A3, tdb:NbSi-16Jac.tdb:HCP_A3, tdb:NbSi-17Jac.tdb:HCP_A3, tdb:NbSi-99Lia.tdb:HCP_A3

TDB models of HCP_A3 (11): PHASE and CONSTITUENT statements as written

NbSi-02Fer-alt.tdb: HCP_A3, type code %A, sha256 8dad947189abee9d…

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

NbSi-02Fer.tdb: HCP_A3, type code %A, sha256 9feec68a8a1d936a…

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

NbSi-03Yan.tdb: HCP_A3, type code %A, sha256 d0927671fb32f539…

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

NbSi-04Sha.tdb: HCP_A3, type code %A, sha256 025b4cfcca64b229…

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

NbSi-06Dav.tdb: HCP_A3, type code %A, sha256 4b08671f6aca1fa7…

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

NbSi-09Gen.tdb: HCP_A3, type code %A, sha256 b11d9c4dae1a0e23…

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

NbSi-10Gen.tdb: HCP_A3, type code %A, sha256 e5e7beb9629a351a…

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

NbSi-13Li.tdb: HCP_A3, type code %A, sha256 1f452b276f51d19f…

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

NbSi-16Jac.tdb: HCP_A3, type code %A, sha256 684fbb477b2e39d4…

44: PHASE HCP_A3 %A 2 1 0.5 !
45: CONST HCP_A3 : NB SI : VA : !

NbSi-17Jac.tdb: HCP_A3, type code %A, sha256 9de41d5e8d379706…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : NB SI : VA : !

NbSi-99Lia.tdb: HCP_A3, type code %A, sha256 e706c2b5c4734dec…

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

Example references (10 of 10; assessments first):

doi:10.1016/j.calphad.2010.07.003 Tai Geng, Changrong Li, Xinqing Zhao, Huibin Xu, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Mo system, Calphad 34, 363-376 (2010).
assessment that models this phase
doi:10.1016/j.calphad.2013.04.004 Yan Li, Changrong Li, Zhenmin Du, Cuiping Guo, Thermodynamic optimization of the Nb–Si–W ternary system, Calphad 43, 112-123 (2013).
assessment that models this phase
doi:10.1016/j.calphad.2016.04.013 A. Jacob, C. Schmetterer, A. Khvan, A. Kondratiev, D. Ivanov, B. Hallstedt, Liquidus projection and thermodynamic modeling of the Cr-Fe-Nb ternary system, Calphad 54 (2016) 1–15, doi:10.1016/j.calphad.2016.04.013.
assessment that models this phase
doi:10.1016/j.calphad.2016.12.002 A. Jacob, E. Povoden-Karadeniz, E. Kozeschnik, Calphad, 56, 80-91(2017).
assessment that models this phase
doi:10.1016/j.intermet.2004.03.011 G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004).
assessment that models this phase
doi:10.1016/j.intermet.2005.08.013 N. David, Y. Cartigny, T. Belmonte, J.M. Fiorani, M. Vilasi, Thermodynamic description of the Cr–Nb–Si isothermal section at 1473K, Intermetallics 14, 464-473 (2006).
assessment that models this phase
doi:10.1016/j.intermet.2008.11.011 Tai Geng, Changrong Li, Jing Bao, Xinqing Zhao, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Ti system, Intermetallics 17, 343-357 (2009).
assessment that models this phase
doi:10.1016/S0966-9795(02)00125-5 P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Intermetallics, 10, 993-99(2002).
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:10.1016/S0966-9795(98)00073-9 H. Liang, Y.A. Chang, Intermetallics, 7, 561-70(1999).
assessment that models this phase

LIQUID (Nb–Si)

Id: phase:nb-si:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 11 of 11 calculated diagram(s): 1662.23–4000 K, x(Si) 0–1
Literature: 80 values (79 accepted) from 4 papers
Interactive: phase registry entry

Names (17): corpus: corpus:phase:nb-si:liquid
paper: paper:10.1016/j.intermet.2004.03.011:L, paper:10.1016/j.intermet.2005.08.013:L, paper:10.1016/s0966-9795(03)00021-9:L, paper:10.1016/s0966-9795(03)00021-9:Liq, paper:10.1016/s0966-9795(98)00073-9:L
tdb: tdb:NbSi-02Fer-alt.tdb:LIQUID, tdb:NbSi-02Fer.tdb:LIQUID, tdb:NbSi-03Yan.tdb:LIQUID, tdb:NbSi-04Sha.tdb:LIQUID, tdb:NbSi-06Dav.tdb:LIQUID, tdb:NbSi-09Gen.tdb:LIQUID, tdb:NbSi-10Gen.tdb:LIQUID, tdb:NbSi-13Li.tdb:LIQUID, tdb:NbSi-16Jac.tdb:LIQUID, tdb:NbSi-17Jac.tdb:LIQUID, tdb:NbSi-99Lia.tdb:LIQUID

TDB models of LIQUID (11): PHASE and CONSTITUENT statements as written

NbSi-02Fer-alt.tdb: LIQUID, type code %, sha256 8dad947189abee9d…

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

NbSi-02Fer.tdb: LIQUID, type code %, sha256 9feec68a8a1d936a…

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

NbSi-03Yan.tdb: LIQUID, type code %, sha256 d0927671fb32f539…

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

NbSi-04Sha.tdb: LIQUID, type code %, sha256 025b4cfcca64b229…

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

NbSi-06Dav.tdb: LIQUID, type code %, sha256 4b08671f6aca1fa7…

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

NbSi-09Gen.tdb: LIQUID, type code %, sha256 b11d9c4dae1a0e23…

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

NbSi-10Gen.tdb: LIQUID, type code %, sha256 e5e7beb9629a351a…

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

NbSi-13Li.tdb: LIQUID, type code %, sha256 1f452b276f51d19f…

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

NbSi-16Jac.tdb: LIQUID, type code %, sha256 684fbb477b2e39d4…

29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : NB SI : !

NbSi-17Jac.tdb: LIQUID, type code %, sha256 9de41d5e8d379706…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : NB SI : !

NbSi-99Lia.tdb: LIQUID, type code %, sha256 e706c2b5c4734dec…

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

Example references (10 of 11; assessments first):

doi:10.1016/j.intermet.2005.08.013 N. David, Y. Cartigny, T. Belmonte, J.M. Fiorani, M. Vilasi, Thermodynamic description of the Cr–Nb–Si isothermal section at 1473K, Intermetallics 14, 464-473 (2006).
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; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(98)00073-9 H. Liang, Y.A. Chang, Intermetallics, 7, 561-70(1999).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(02)00125-5 P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Intermetallics, 10, 993-99(2002).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.intermet.2004.03.011 G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.calphad.2010.07.003 Tai Geng, Changrong Li, Xinqing Zhao, Huibin Xu, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Mo system, Calphad 34, 363-376 (2010).
assessment that models this phase
doi:10.1016/j.calphad.2013.04.004 Yan Li, Changrong Li, Zhenmin Du, Cuiping Guo, Thermodynamic optimization of the Nb–Si–W ternary system, Calphad 43, 112-123 (2013).
assessment that models this phase
doi:10.1016/j.calphad.2016.04.013 A. Jacob, C. Schmetterer, A. Khvan, A. Kondratiev, D. Ivanov, B. Hallstedt, Liquidus projection and thermodynamic modeling of the Cr-Fe-Nb ternary system, Calphad 54 (2016) 1–15, doi:10.1016/j.calphad.2016.04.013.
assessment that models this phase
doi:10.1016/j.calphad.2016.12.002 A. Jacob, E. Povoden-Karadeniz, E. Kozeschnik, Calphad, 56, 80-91(2017).
assessment that models this phase
doi:10.1016/j.intermet.2008.11.011 Tai Geng, Changrong Li, Jing Bao, Xinqing Zhao, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Ti system, Intermetallics 17, 343-357 (2009).
assessment that models this phase

NB3SI (Nb–Si)

Id: phase:nb-si:nb3si; status assigned
Structure: Ti3P · tP32 · P4_2/n (86); type st:ti3p-tp32; 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: Nb 0.7500, Si 0.2500
Stability: stable in 11 of 11 calculated diagram(s): 1940–2270 K, x(Si) 0.25–0.25
Literature: 81 values (80 accepted) from 7 papers
Interactive: phase registry entry

Names (20): corpus: corpus:phase:nb-si:nb3si
paper: paper:10.1016/j.calphad.2013.04.004:Nb3Si, paper:10.1016/j.intermet.2004.03.011:Nb3Si, paper:10.1016/j.intermet.2005.08.013:Nb3Si, paper:10.1016/j.intermet.2005.08.013:NbSi3, paper:10.1016/j.intermet.2008.11.011:Nb3Si, paper:10.1016/j.jallcom.2017.04.279:Nb3Si, paper:10.1016/s0966-9795(03)00021-9:Nb3Si, paper:10.1016/s0966-9795(98)00073-9:Nb3Si
tdb: tdb:NbSi-02Fer-alt.tdb:NB3SI, tdb:NbSi-02Fer.tdb:NB3SI, tdb:NbSi-03Yan.tdb:NB3SI, tdb:NbSi-04Sha.tdb:NB3SI, tdb:NbSi-06Dav.tdb:NB3SI, tdb:NbSi-09Gen.tdb:NB3SI, tdb:NbSi-10Gen.tdb:NB3SI, tdb:NbSi-13Li.tdb:NB3SI, tdb:NbSi-16Jac.tdb:NB3SI, tdb:NbSi-17Jac.tdb:NB3SI, tdb:NbSi-99Lia.tdb:NB3SI

TDB models of NB3SI (11): PHASE and CONSTITUENT statements as written

NbSi-02Fer-alt.tdb: NB3SI, type code %, sha256 8dad947189abee9d…

48: PHASE NB3SI % 2 3 1 !
49: CONST NB3SI : NB : SI : !

NbSi-02Fer.tdb: NB3SI, type code %, sha256 9feec68a8a1d936a…

48: PHASE NB3SI % 2 3 1 !
49: CONST NB3SI : NB : SI : !

NbSi-03Yan.tdb: NB3SI, type code %, sha256 d0927671fb32f539…

48: PHASE NB3SI % 2 3 1 !
49: CONST NB3SI : NB : SI : !

NbSi-04Sha.tdb: NB3SI, type code %, sha256 025b4cfcca64b229…

46: PHASE NB3SI % 2 3 1 !
47: CONST NB3SI : NB : SI : !

NbSi-06Dav.tdb: NB3SI, type code %, sha256 4b08671f6aca1fa7…

48: PHASE NB3SI % 2 3 1 !
49: CONST NB3SI : NB : SI : !

NbSi-09Gen.tdb: NB3SI, type code %, sha256 b11d9c4dae1a0e23…

48: PHASE NB3SI % 2 3 1 !
49: CONST NB3SI : NB : SI : !

NbSi-10Gen.tdb: NB3SI, type code %, sha256 e5e7beb9629a351a…

47: PHASE NB3SI % 2 3 1 !
48: CONST NB3SI : NB : SI : !

NbSi-13Li.tdb: NB3SI, type code %, sha256 1f452b276f51d19f…

47: PHASE NB3SI % 2 3 1 !
48: CONST NB3SI : NB : SI : !

NbSi-16Jac.tdb: NB3SI, type code %, sha256 684fbb477b2e39d4…

54: PHASE NB3SI % 2 3 1 !
55: CONST NB3SI : NB : SI : !

NbSi-17Jac.tdb: NB3SI, type code %, sha256 9de41d5e8d379706…

50: PHASE NB3SI % 2 3 1 !
51: CONST NB3SI : NB : SI : !

NbSi-99Lia.tdb: NB3SI, type code %, sha256 e706c2b5c4734dec…

44: PHASE NB3SI % 2 3 1 !
45: CONST NB3SI : NB : SI : !

Example references (10 of 15; assessments first):

doi:10.1016/j.intermet.2005.08.013 N. David, Y. Cartigny, T. Belmonte, J.M. Fiorani, M. Vilasi, Thermodynamic description of the Cr–Nb–Si isothermal section at 1473K, Intermetallics 14, 464-473 (2006).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.intermet.2004.03.011 G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004).
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; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(98)00073-9 H. Liang, Y.A. Chang, Intermetallics, 7, 561-70(1999).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(02)00125-5 P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Intermetallics, 10, 993-99(2002).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.intermet.2008.11.011 Tai Geng, Changrong Li, Jing Bao, Xinqing Zhao, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Ti system, Intermetallics 17, 343-357 (2009).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2013.04.004 Yan Li, Changrong Li, Zhenmin Du, Cuiping Guo, Thermodynamic optimization of the Nb–Si–W ternary system, Calphad 43, 112-123 (2013).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2010.07.003 Tai Geng, Changrong Li, Xinqing Zhao, Huibin Xu, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Mo system, Calphad 34, 363-376 (2010).
assessment that models this phase
doi:10.1016/j.calphad.2016.04.013 A. Jacob, C. Schmetterer, A. Khvan, A. Kondratiev, D. Ivanov, B. Hallstedt, Liquidus projection and thermodynamic modeling of the Cr-Fe-Nb ternary system, Calphad 54 (2016) 1–15, doi:10.1016/j.calphad.2016.04.013.
assessment that models this phase
doi:10.1016/j.calphad.2016.12.002 A. Jacob, E. Povoden-Karadeniz, E. Kozeschnik, Calphad, 56, 80-91(2017).
assessment that models this phase

NB5SI3 (Nb–Si)

Id: phase:nb-si:nb5si3; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition
Candidate (dft_mp): I4/mcm (140) — on-hull MP Nb5Si3 at x(SI)=0.3750
Candidate (dft_oqmd): I4/mcm (140) — on-hull OQMD Nb5 Si3 at x(SI)=0.3750
Candidate (tdb_comment): Cr5B3 · tI32 · I4/mcm — NbSi-99Lia.tdb: 'Prototype Cr5B3 (tI32, I4/mcm), alpha-Nb5Si3'
Candidate (tdb_comment): W5Si3 · tI32 · I4/mcm — NbSi-99Lia.tdb: 'Prototype W5Si3 (tI32, I4/mcm), beta-Nb5Si3'
Stoichiometry: Nb 0.6250, Si 0.3750
Stability: stable in 1 of 1 calculated diagram(s): 300–2760.97 K, x(Si) 0.375–0.375
Literature: 23 values (23 accepted) from 3 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:nb-si:nb5si3
paper: paper:10.1016/j.intermet.2004.03.011:Nb5Si3, paper:10.1016/j.jallcom.2017.04.279:Nb5Si3, paper:10.1016/s0966-9795(98)00073-9:Nb5Si3
tdb: tdb:NbSi-99Lia.tdb:NB5SI3

TDB models of NB5SI3 (1): PHASE and CONSTITUENT statements as written

NbSi-99Lia.tdb: NB5SI3, type code %, sha256 e706c2b5c4734dec…

50: PHASE NB5SI3 % 2 5 3 !
51: CONST NB5SI3 : NB : SI : !

Example references (9 of 9; assessments first):

doi:10.1016/S0966-9795(98)00073-9 H. Liang, Y.A. Chang, Intermetallics, 7, 561-70(1999).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.intermet.2004.03.011 G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004).
reports values for this phase
doi:10.1016/j.jallcom.2017.04.279 Claire A. Utton, Ioannis Papadimitriou, Hajime Kinoshita, Panos Tsakiropoulos, Experimental and thermodynamic assessment of the Ge-Nb-Si ternary phase diagram, Journal of Alloys and Compounds 717, 303-316 (2017).
reports values for this phase
doi:10.1007/s11661-015-3149-0 Ioannis Papadimitriou, Claire Utton, Panos Tsakiropoulos, On the Nb-Ge Binary System, Metall Mater Trans A 46, 5526-5536 (2015).
cited as the source of values for this phase
doi:10.1016/0956-716x(91)90387-g M.G Mendiratta, D.M Dimiduk, Phase relations and transformation kinetics in the high Nb region of the Nb-Si system, Scripta Metallurgica et Materialia 25, 237-242 (1991).
cited as the source of values for this phase
doi:10.1016/s0966-9795(02)00125-5 P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Thermodynamic modeling of the Nb–Si system, Intermetallics 10, 993-999 (2002).
cited as the source of values for this phase
doi:10.1016/0364-5916(79)90020-8 Kaufman L. Calphad 1979;3:45.
cited as the source of values for this phase
doi:10.1016/s0925-8388(98)00504-0 S.V. Meschel, O.J. Kleppa, Standard enthalpies of formation of some 4d transition metal silicides by high temperature direct synthesis calorimetry, Journal of Alloys and Compounds 274, 193-200 (1998).
cited as the source of values for this phase
doi:10.1016/s0966-9795(03)00021-9 Y Yang, Y.A Chang, J.-C Zhao, B.P Bewlay, Thermodynamic modeling of the Nb–Hf–Si ternary system, Intermetallics 11, 407-415 (2003).
cited as the source of values for this phase

NB5SI3_D8L (Nb–Si)

Id: phase:nb-si:nb5si3-d8l; status assigned
Structure: Cr5B3 · D8_l · tI32 · I4/mcm (140); type st:d8-l-cr5b3-ti32; tier A: standard phase name; confidence high
Stability: stable in 10 of 10 calculated diagram(s): 300–2219.76 K, x(Si) 0.375–0.38215
Literature: 27 values (27 accepted) from 3 papers
Interactive: phase registry entry

Names (14): corpus: corpus:phase:nb-si:nb5si3-d8l
paper: paper:10.1016/j.intermet.2005.08.013:αNb5Si3, paper:10.1016/s0966-9795(02)00125-5:αNb5Si3, paper:10.1016/s0966-9795(03)00021-9:Nb5Si3
tdb: tdb:NbSi-02Fer-alt.tdb:NB5SI3_D8L, tdb:NbSi-02Fer.tdb:NB5SI3_D8L, tdb:NbSi-03Yan.tdb:NB5SI3_D8L, tdb:NbSi-04Sha.tdb:NB5SI3_D8L, tdb:NbSi-06Dav.tdb:NB5SI3_D8L, tdb:NbSi-09Gen.tdb:NB5SI3_D8L, tdb:NbSi-10Gen.tdb:NB5SI3_D8L, tdb:NbSi-13Li.tdb:NB5SI3_D8L, tdb:NbSi-16Jac.tdb:NB5SI3_D8L, tdb:NbSi-17Jac.tdb:NB5SI3_D8L

TDB models of NB5SI3_D8L (10): PHASE and CONSTITUENT statements as written

NbSi-02Fer-alt.tdb: NB5SI3_D8L, type code %, sha256 8dad947189abee9d…

53: PHASE NB5SI3_D8L % 2 5 3 !
54: CONST NB5SI3_D8L : NB : SI : !

NbSi-02Fer.tdb: NB5SI3_D8L, type code %, sha256 9feec68a8a1d936a…

53: PHASE NB5SI3_D8L % 2 5 3 !
54: CONST NB5SI3_D8L : NB : SI : !

NbSi-03Yan.tdb: NB5SI3_D8L, type code %, sha256 d0927671fb32f539…

53: PHASE NB5SI3_D8L % 2 5 3 !
54: CONST NB5SI3_D8L : NB : SI : !

NbSi-04Sha.tdb: NB5SI3_D8L, type code %, sha256 025b4cfcca64b229…

51: PHASE NB5SI3_D8L % 2 5 3 !
52: CONST NB5SI3_D8L : NB : SI : !

NbSi-06Dav.tdb: NB5SI3_D8L, type code %, sha256 4b08671f6aca1fa7…

53: PHASE NB5SI3_D8L % 2 5 3 !
54: CONST NB5SI3_D8L : NB% SI : SI : !

NbSi-09Gen.tdb: NB5SI3_D8L, type code %, sha256 b11d9c4dae1a0e23…

53: PHASE NB5SI3_D8L % 2 5 3 !
54: CONST NB5SI3_D8L : NB% SI : SI : !

NbSi-10Gen.tdb: NB5SI3_D8L, type code %, sha256 e5e7beb9629a351a…

52: PHASE NB5SI3_D8L % 2 5 3 !
53: CONST NB5SI3_D8L : NB% SI : SI : !

NbSi-13Li.tdb: NB5SI3_D8L, type code %, sha256 1f452b276f51d19f…

52: PHASE NB5SI3_D8L % 2 5 3 !
53: CONST NB5SI3_D8L : NB% SI : SI : !

NbSi-16Jac.tdb: NB5SI3_D8L, type code %, sha256 684fbb477b2e39d4…

59: PHASE NB5SI3_D8L % 2 5 3 !
60: CONST NB5SI3_D8L : NB% SI : SI : !

NbSi-17Jac.tdb: NB5SI3_D8L, type code %, sha256 9de41d5e8d379706…

55: PHASE NB5SI3_D8L % 2 5 3 !
56: CONST NB5SI3_D8L : NB% SI : SI : !

Example references (10 of 12; assessments first):

doi:10.1016/j.intermet.2005.08.013 N. David, Y. Cartigny, T. Belmonte, J.M. Fiorani, M. Vilasi, Thermodynamic description of the Cr–Nb–Si isothermal section at 1473K, Intermetallics 14, 464-473 (2006).
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; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(02)00125-5 P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Intermetallics, 10, 993-99(2002).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.intermet.2004.03.011 G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.calphad.2010.07.003 Tai Geng, Changrong Li, Xinqing Zhao, Huibin Xu, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Mo system, Calphad 34, 363-376 (2010).
assessment that models this phase
doi:10.1016/j.calphad.2013.04.004 Yan Li, Changrong Li, Zhenmin Du, Cuiping Guo, Thermodynamic optimization of the Nb–Si–W ternary system, Calphad 43, 112-123 (2013).
assessment that models this phase
doi:10.1016/j.calphad.2016.04.013 A. Jacob, C. Schmetterer, A. Khvan, A. Kondratiev, D. Ivanov, B. Hallstedt, Liquidus projection and thermodynamic modeling of the Cr-Fe-Nb ternary system, Calphad 54 (2016) 1–15, doi:10.1016/j.calphad.2016.04.013.
assessment that models this phase
doi:10.1016/j.calphad.2016.12.002 A. Jacob, E. Povoden-Karadeniz, E. Kozeschnik, Calphad, 56, 80-91(2017).
assessment that models this phase
doi:10.1016/j.intermet.2008.11.011 Tai Geng, Changrong Li, Jing Bao, Xinqing Zhao, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Ti system, Intermetallics 17, 343-357 (2009).
assessment that models this phase
doi:10.1007/bf02671971 M. E. Schlesinger, H. Okamoto, A. B. Gokhale, R. Abbaschian, The Nb-Si (Niobium-Silicon) system, JPE 14, 502-509 (1993).
cited as the source of values for this phase

NB5SI3_D8M (Nb–Si)

Id: phase:nb-si:nb5si3-d8m; status assigned
Structure: W5Si3 · D8_m · tI32 · I4/mcm (140); type st:d8-m-w5si3-ti32; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in NbSi-10Gen.tdb also describes the disordered state
Caveat: partitioned order/disorder model in NbSi-13Li.tdb also describes the disordered state
Stability: stable in 8 of 8 calculated diagram(s): 1914.75–2805.15 K, x(Si) 0.37502–0.40814
Literature: 60 values (60 accepted) from 3 papers
Interactive: phase registry entry

Names (12): corpus: corpus:phase:nb-si:nb5si3-d8m
paper: paper:10.1016/j.intermet.2004.03.011:βNb5Si3, paper:10.1016/j.intermet.2005.08.013:βNb5Si3, paper:10.1016/s0966-9795(03)00021-9:βNb5Si3
tdb: tdb:NbSi-02Fer-alt.tdb:NB5SI3_D8M, tdb:NbSi-02Fer.tdb:NB5SI3_D8M, tdb:NbSi-03Yan.tdb:NB5SI3_D8M, tdb:NbSi-04Sha.tdb:NB5SI3_D8M, tdb:NbSi-06Dav.tdb:NB5SI3_D8M, tdb:NbSi-09Gen.tdb:NB5SI3_D8M, tdb:NbSi-10Gen.tdb:NB5SI3_D8M, tdb:NbSi-13Li.tdb:NB5SI3_D8M

TDB models of NB5SI3_D8M (8): PHASE and CONSTITUENT statements as written

NbSi-02Fer-alt.tdb: NB5SI3_D8M, type code %, sha256 8dad947189abee9d…

58: PHASE NB5SI3_D8M % 3 4 1 3 !
59: CONST NB5SI3_D8M : NB : NB VA : SI : !

NbSi-02Fer.tdb: NB5SI3_D8M, type code %, sha256 9feec68a8a1d936a…

58: PHASE NB5SI3_D8M % 3 4 1 3 !
59: CONST NB5SI3_D8M : NB : NB SI : SI : !

NbSi-03Yan.tdb: NB5SI3_D8M, type code %, sha256 d0927671fb32f539…

58: PHASE NB5SI3_D8M % 3 4 1 3 !
59: CONST NB5SI3_D8M : NB : NB SI : SI : !

NbSi-04Sha.tdb: NB5SI3_D8M, type code %, sha256 025b4cfcca64b229…

56: PHASE NB5SI3_D8M % 3 4 1 3 !
57: CONST NB5SI3_D8M : NB : NB SI : SI : !

NbSi-06Dav.tdb: NB5SI3_D8M, type code %, sha256 4b08671f6aca1fa7…

58: PHASE NB5SI3_D8M % 3 4 1 3 !
59: CONST NB5SI3_D8M : NB : NB SI : SI : !

NbSi-09Gen.tdb: NB5SI3_D8M, type code %, sha256 b11d9c4dae1a0e23…

58: PHASE NB5SI3_D8M % 3 4 1 3 !
59: CONST NB5SI3_D8M : NB : NB SI : SI : !

NbSi-10Gen.tdb: NB5SI3_D8M, type code %, sha256 e5e7beb9629a351a…

57: PHASE NB5SI3_D8M % 3 4 1 3 !
58: CONST NB5SI3_D8M : NB : NB SI : NB SI% : !

NbSi-13Li.tdb: NB5SI3_D8M, type code %, sha256 1f452b276f51d19f…

57: PHASE NB5SI3_D8M % 3 4 1 3 !
58: CONST NB5SI3_D8M : NB : NB SI : NB SI% : !

Example references (9 of 9; assessments first):

doi:10.1016/j.intermet.2005.08.013 N. David, Y. Cartigny, T. Belmonte, J.M. Fiorani, M. Vilasi, Thermodynamic description of the Cr–Nb–Si isothermal section at 1473K, Intermetallics 14, 464-473 (2006).
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; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(02)00125-5 P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Intermetallics, 10, 993-99(2002).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.intermet.2004.03.011 G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.calphad.2010.07.003 Tai Geng, Changrong Li, Xinqing Zhao, Huibin Xu, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Mo system, Calphad 34, 363-376 (2010).
assessment that models this phase
doi:10.1016/j.calphad.2013.04.004 Yan Li, Changrong Li, Zhenmin Du, Cuiping Guo, Thermodynamic optimization of the Nb–Si–W ternary system, Calphad 43, 112-123 (2013).
assessment that models this phase
doi:10.1016/j.intermet.2008.11.011 Tai Geng, Changrong Li, Jing Bao, Xinqing Zhao, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Ti system, Intermetallics 17, 343-357 (2009).
assessment that models this phase
doi:10.1007/bf02671971 M. E. Schlesinger, H. Okamoto, A. B. Gokhale, R. Abbaschian, The Nb-Si (Niobium-Silicon) system, JPE 14, 502-509 (1993).
cited as the source of values for this phase
doi:10.1016/s0966-9795(98)00073-9 H. Liang, Y.A. Chang, Thermodynamic modeling of the Nb–Si–Ti ternary system, Intermetallics 7, 561-570 (1999).
cited as the source of values for this phase

NBSI2_C40 (Nb–Si)

Id: phase:nb-si:nbsi2-c40; status assigned
Structure: CrSi2 · C40 · hP9 · P6_222 (180); type st:c40-crsi2-hp9; tier A: standard phase name; confidence high
Stability: stable in 9 of 9 calculated diagram(s): 300–2236.14 K, x(Si) 0.66667–0.66826
Literature: 57 values (57 accepted) from 5 papers
Interactive: phase registry entry

Names (15): corpus: corpus:phase:nb-si:nbsi2-c40
paper: paper:10.1016/j.intermet.2004.03.011:NbSi2, paper:10.1016/j.intermet.2005.08.013:NbSi2, paper:10.1016/s0966-9795(02)00125-5:NbSi2, paper:10.1016/s0966-9795(03)00021-9:NbSi2, paper:10.1016/s0966-9795(98)00073-9:NbSi2
tdb: tdb:NbSi-02Fer-alt.tdb:NBSI2_C40, tdb:NbSi-02Fer.tdb:NBSI2_C40, tdb:NbSi-03Yan.tdb:NBSI2_C40, tdb:NbSi-04Sha.tdb:NBSI2_C40, tdb:NbSi-06Dav.tdb:NBSI2_C40, tdb:NbSi-09Gen.tdb:NBSI2_C40, tdb:NbSi-10Gen.tdb:NBSI2_C40, tdb:NbSi-13Li.tdb:NBSI2_C40, tdb:NbSi-99Lia.tdb:NBSI2_C40

TDB models of NBSI2_C40 (9): PHASE and CONSTITUENT statements as written

NbSi-02Fer-alt.tdb: NBSI2_C40, type code %, sha256 8dad947189abee9d…

63: PHASE NBSI2_C40 % 2 1 2 !
64: CONST NBSI2_C40 : NB : SI : !

NbSi-02Fer.tdb: NBSI2_C40, type code %, sha256 9feec68a8a1d936a…

63: PHASE NBSI2_C40 % 2 1 2 !
64: CONST NBSI2_C40 : NB : SI : !

NbSi-03Yan.tdb: NBSI2_C40, type code %, sha256 d0927671fb32f539…

63: PHASE NBSI2_C40 % 2 1 2 !
64: CONST NBSI2_C40 : NB : SI : !

NbSi-04Sha.tdb: NBSI2_C40, type code %, sha256 025b4cfcca64b229…

61: PHASE NBSI2_C40 % 2 1 2 !
62: CONST NBSI2_C40 : NB : SI : !

NbSi-06Dav.tdb: NBSI2_C40, type code %, sha256 4b08671f6aca1fa7…

63: PHASE NBSI2_C40 % 2 1 2 !
64: CONST NBSI2_C40 : NB% SI : SI : !

NbSi-09Gen.tdb: NBSI2_C40, type code %, sha256 b11d9c4dae1a0e23…

63: PHASE NBSI2_C40 % 2 1 2 !
64: CONST NBSI2_C40 : NB% SI : SI : !

NbSi-10Gen.tdb: NBSI2_C40, type code %, sha256 e5e7beb9629a351a…

62: PHASE NBSI2_C40 % 2 1 2 !
63: CONST NBSI2_C40 : NB% SI : SI : !

NbSi-13Li.tdb: NBSI2_C40, type code %, sha256 1f452b276f51d19f…

62: PHASE NBSI2_C40 % 2 1 2 !
63: CONST NBSI2_C40 : NB% SI : SI : !

NbSi-99Lia.tdb: NBSI2_C40, type code %, sha256 e706c2b5c4734dec…

55: PHASE NBSI2_C40 % 2 1 2 !
56: CONST NBSI2_C40 : NB : SI : !

Example references (10 of 11; assessments first):

doi:10.1016/j.intermet.2005.08.013 N. David, Y. Cartigny, T. Belmonte, J.M. Fiorani, M. Vilasi, Thermodynamic description of the Cr–Nb–Si isothermal section at 1473K, Intermetallics 14, 464-473 (2006).
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; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.intermet.2004.03.011 G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(02)00125-5 P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Intermetallics, 10, 993-99(2002).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/S0966-9795(98)00073-9 H. Liang, Y.A. Chang, Intermetallics, 7, 561-70(1999).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.calphad.2010.07.003 Tai Geng, Changrong Li, Xinqing Zhao, Huibin Xu, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Mo system, Calphad 34, 363-376 (2010).
assessment that models this phase
doi:10.1016/j.calphad.2013.04.004 Yan Li, Changrong Li, Zhenmin Du, Cuiping Guo, Thermodynamic optimization of the Nb–Si–W ternary system, Calphad 43, 112-123 (2013).
assessment that models this phase
doi:10.1016/j.intermet.2008.11.011 Tai Geng, Changrong Li, Jing Bao, Xinqing Zhao, Zhenmin Du, Cuiping Guo, Thermodynamic assessment of the Nb–Si–Ti system, Intermetallics 17, 343-357 (2009).
assessment that models this phase
doi:10.1007/bf02671971 M. E. Schlesinger, H. Okamoto, A. B. Gokhale, R. Abbaschian, The Nb-Si (Niobium-Silicon) system, JPE 14, 502-509 (1993).
cited as the source of values for this phase
doi:10.1016/s0925-8388(98)00504-0 S.V. Meschel, O.J. Kleppa, Standard enthalpies of formation of some 4d transition metal silicides by high temperature direct synthesis calorimetry, Journal of Alloys and Compounds 274, 193-200 (1998).
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}
}