Nb–Si system

232 accepted literature values from 8 paper(s) (experimental 34, model 189, DFT 5, unspecified 4); 11 calculated phase diagram(s). 4 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (12) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	34
model	189
DFT	5
unspecified	4

Accepted values by property group
Property group	Values
invariant reaction	104
phase transition	28
formation	83
crystal structure	17

Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
NbSi-02Fer-alt.tdb	P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Intermetallics, 10, 993-99(2002). doi:10.1016/S0966-9795(02)00125-5	`8dad947189abee9dd6b5d4415144583c7528704b57db8d3f682e559ac9a427c7`	viewer · TDB · JSON
NbSi-02Fer.tdb	P.B. Fernandes, G.C. Coelho, F. Ferreira, C.A. Nunes, B. Sundman, Intermetallics, 10, 993-99(2002). doi:10.1016/S0966-9795(02)00125-5	`9feec68a8a1d936a8ce92846562356c07f87523507fa66826a5dd4710b2e81bb`	viewer · TDB · JSON
NbSi-03Yan.tdb	Y. Yang, Y.A. Chang, J.-C. Zhao, B.P. Bewlay, Intermetallics, 11, 407-15(2003). doi:10.1016/S0966-9795(03)00021-9	`d0927671fb32f5392dff8f8465bd905eb02c7135fb7e1b198338a8ce415ceb13`	viewer · TDB · JSON
NbSi-04Sha.tdb	G. Shao, Intermetallics, 12, 655-64(2004). doi:10.1016/j.intermet.2004.03.011	`025b4cfcca64b229fc714a3993cc60d403790447934344f527d27ed6ab88b8eb`	viewer · TDB · JSON
NbSi-06Dav.tdb	N. David, Y. Cartigny, T. Belmonte, J.M. Fiorani, M. Vilasi, Intermetallics, 14, 464-73(2006). doi:10.1016/j.intermet.2005.08.013	`4b08671f6aca1fa7dc69f81da36c261a71237fe19486777f8ed6ad70b15630a1`	viewer · TDB · JSON
NbSi-09Gen.tdb	T. Geng, C. Li, J. Bao, X. Zhao, Z. Du, C. Guo, Intermetallics, 17, 343-57(2009). doi:10.1016/j.intermet.2008.11.011	`b11d9c4dae1a0e2341974329ac5217e29fdf98e6fe4dd74f265d2ac9d8c709b8`	viewer · TDB · JSON
NbSi-10Gen.tdb	T. Geng, C. Li, X. Zhao, H. Xu, Z. Du, C. Guo, Calphad, 34, 363-76(2010). doi:10.1016/j.calphad.2010.07.003	`e5e7beb9629a351ad6c02371ac9acd45aa8fe2af6df4928280e19030b00f8163`	viewer · TDB · JSON
NbSi-13Li.tdb	Y. Li, C. Li, Z. Du, C. Guo, Calphad, 43, 112-23(2013). doi:10.1016/j.calphad.2013.04.004	`1f452b276f51d19f6fdddf479c8ba80b0f0df6b1bbba9d7281d2596a16e9edf2`	viewer · TDB · JSON
NbSi-16Jac.tdb	A. Jacob, unpublished, 2016 doi:10.1016/j.calphad.2016.04.013	`684fbb477b2e39d4eb479a2f592872806e047d4eadc7d9a84367758f31731123`	viewer · TDB · JSON
NbSi-17Jac.tdb	A. Jacob, E. Povoden-Karadeniz, E. Kozeschnik, Calphad, 56, 80-91(2017). doi:10.1016/j.calphad.2016.12.002	`9de41d5e8d379706af09db74c36c945f42a731fe17ef927a864141784f397d69`	viewer · TDB · JSON
NbSi-99Lia.tdb	H. Liang, Y.A. Chang, Intermetallics, 7, 561-70(1999). doi:10.1016/S0966-9795(98)00073-9	`e706c2b5c4734dec5e70997fbedf3905053f043c56e7a05fa5e6a9f488915e71`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
NbSi-02Fer-alt.tdb	2241.46	LIQUID (x(Si) 0.18626) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37541)
NbSi-02Fer-alt.tdb	2241.46	LIQUID (x(Si) 0.1862) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37541)
NbSi-02Fer-alt.tdb	2211.81	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37538)
NbSi-02Fer-alt.tdb	2205.84	BCC_A2 (x(Si) 0.03583) + LIQUID (x(Si) 0.16942) + NB3SI (x(Si) 0.25)
NbSi-02Fer-alt.tdb	2205.84	BCC_A2 (x(Si) 0.03583) + LIQUID (x(Si) 0.16941) + NB3SI (x(Si) 0.25)
NbSi-02Fer-alt.tdb	2150.94	NB5SI3_D8M (x(Si) 0.40353) + LIQUID (x(Si) 0.58016) + NBSI2_C40 (x(Si) 0.66667)
NbSi-02Fer-alt.tdb	1940.42	BCC_A2 (x(Si) 0.02069) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-02Fer-alt.tdb	1940.42	BCC_A2 (x(Si) 0.02068) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-02Fer-alt.tdb	1940.42	BCC_A2 (x(Si) 0.02066) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-02Fer-alt.tdb	1917.64	NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.39505) + NBSI2_C40 (x(Si) 0.66667)
NbSi-02Fer-alt.tdb	1679.43	NBSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.98214) + DIAMOND_A4 (x(Si) 1)
NbSi-02Fer-alt.tdb	1679.42	NBSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.98241) + DIAMOND_A4 (x(Si) 1)
NbSi-02Fer.tdb	2269.94	LIQUID (x(Si) 0.19768) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37509)
NbSi-02Fer.tdb	2269.94	LIQUID (x(Si) 0.19765) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37509)
NbSi-02Fer.tdb	2211.17	BCC_A2 (x(Si) 0.03401) + LIQUID (x(Si) 0.16954) + NB3SI (x(Si) 0.25)
NbSi-02Fer.tdb	2211.17	BCC_A2 (x(Si) 0.03398) + LIQUID (x(Si) 0.1695) + NB3SI (x(Si) 0.25)
NbSi-02Fer.tdb	2208.02	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.3751)
NbSi-02Fer.tdb	2208.02	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.3751)
NbSi-02Fer.tdb	2147.65	NB5SI3_D8M (x(Si) 0.39353) + LIQUID (x(Si) 0.57358) + NBSI2_C40 (x(Si) 0.66667)
NbSi-02Fer.tdb	1951.9	BCC_A2 (x(Si) 0.02105) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-02Fer.tdb	1951.9	BCC_A2 (x(Si) 0.02104) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-02Fer.tdb	1951.9	BCC_A2 (x(Si) 0.02103) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-02Fer.tdb	1951.9	BCC_A2 (x(Si) 0.02104) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-02Fer.tdb	1922.88	NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.39502) + NBSI2_C40 (x(Si) 0.66667)
NbSi-02Fer.tdb	1922.88	NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.39503) + NBSI2_C40 (x(Si) 0.66667)
NbSi-02Fer.tdb	1679.35	NBSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.98193) + DIAMOND_A4 (x(Si) 1)
NbSi-02Fer.tdb	1679.35	NBSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.9822) + DIAMOND_A4 (x(Si) 1)
NbSi-03Yan.tdb	2258.3	LIQUID (x(Si) 0.20171) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37513)
NbSi-03Yan.tdb	2258.3	LIQUID (x(Si) 0.2017) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37513)
NbSi-03Yan.tdb	2219.76	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37512)
NbSi-03Yan.tdb	2219.76	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37512)
NbSi-03Yan.tdb	2188.68	BCC_A2 (x(Si) 0.03418) + LIQUID (x(Si) 0.16925) + NB3SI (x(Si) 0.25)
NbSi-03Yan.tdb	2188.68	BCC_A2 (x(Si) 0.03417) + LIQUID (x(Si) 0.16923) + NB3SI (x(Si) 0.25)
NbSi-03Yan.tdb	2150.94	NB5SI3_D8M (x(Si) 0.40784) + LIQUID (x(Si) 0.57851) + NBSI2_C40 (x(Si) 0.66667)
NbSi-03Yan.tdb	1973.19	BCC_A2 (x(Si) 0.02427) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-03Yan.tdb	1973.19	BCC_A2 (x(Si) 0.02425) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-03Yan.tdb	1973.19	BCC_A2 (x(Si) 0.02423) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-03Yan.tdb	1973.19	BCC_A2 (x(Si) 0.02425) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-03Yan.tdb	1914.75	NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.40695) + NBSI2_C40 (x(Si) 0.66667)
NbSi-03Yan.tdb	1914.75	NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.40697) + NBSI2_C40 (x(Si) 0.66667)
NbSi-03Yan.tdb	1679.07	NBSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.98133) + DIAMOND_A4 (x(Si) 1)
NbSi-03Yan.tdb	1679.07	NBSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.9816) + DIAMOND_A4 (x(Si) 1)
NbSi-04Sha.tdb	2256.6	LIQUID (x(Si) 0.21107) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37896)
NbSi-04Sha.tdb	2256.6	LIQUID (x(Si) 0.21103) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37896)
NbSi-04Sha.tdb	2204.33	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37931)
NbSi-04Sha.tdb	2204.33	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37931)
NbSi-04Sha.tdb	2184.92	BCC_A2 (x(Si) 0.03865) + LIQUID (x(Si) 0.17449) + NB3SI (x(Si) 0.25)
NbSi-04Sha.tdb	2184.92	BCC_A2 (x(Si) 0.03861) + LIQUID (x(Si) 0.17442) + NB3SI (x(Si) 0.25)
NbSi-04Sha.tdb	2168.21	NB5SI3_D8M (x(Si) 0.40058) + LIQUID (x(Si) 0.57731) + NBSI2_C40 (x(Si) 0.66667)
NbSi-04Sha.tdb	1966.44	BCC_A2 (x(Si) 0.03143) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-04Sha.tdb	1966.44	BCC_A2 (x(Si) 0.03144) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-04Sha.tdb	1966.44	BCC_A2 (x(Si) 0.03142) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-04Sha.tdb	1966.44	BCC_A2 (x(Si) 0.03142) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-04Sha.tdb	1924.76	NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.40186) + NBSI2_C40 (x(Si) 0.66667)
NbSi-04Sha.tdb	1924.76	NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.40187) + NBSI2_C40 (x(Si) 0.66667)
NbSi-04Sha.tdb	1678.92	NBSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.98168) + DIAMOND_A4 (x(Si) 1)
NbSi-04Sha.tdb	1678.91	NBSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.98195) + DIAMOND_A4 (x(Si) 1)
NbSi-06Dav.tdb	2248.85	LIQUID (x(Si) 0.18789) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.3751)
NbSi-06Dav.tdb	2248.85	LIQUID (x(Si) 0.18786) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.3751)
NbSi-06Dav.tdb	2209.1	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37508)
NbSi-06Dav.tdb	2209.1	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37508)
NbSi-06Dav.tdb	2188.12	BCC_A2 (x(Si) 0.02702) + LIQUID (x(Si) 0.16171) + NB3SI (x(Si) 0.25)
NbSi-06Dav.tdb	2188.12	BCC_A2 (x(Si) 0.02701) + LIQUID (x(Si) 0.16169) + NB3SI (x(Si) 0.25)
NbSi-06Dav.tdb	2159.52	NB5SI3_D8M (x(Si) 0.40724) + LIQUID (x(Si) 0.59245) + NBSI2_C40 (x(Si) 0.66667)
NbSi-06Dav.tdb	1975.27	BCC_A2 (x(Si) 0.01771) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-06Dav.tdb	1975.27	BCC_A2 (x(Si) 0.01771) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-06Dav.tdb	1975.27	BCC_A2 (x(Si) 0.01769) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-06Dav.tdb	1975.27	BCC_A2 (x(Si) 0.0177) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-06Dav.tdb	1925.43	NB5SI3_D8L (x(Si) 0.38215) + NB5SI3_D8M (x(Si) 0.40101) + NBSI2_C40 (x(Si) 0.66667)
NbSi-06Dav.tdb	1925.43	NB5SI3_D8L (x(Si) 0.38215) + NB5SI3_D8M (x(Si) 0.40102) + NBSI2_C40 (x(Si) 0.66667)
NbSi-06Dav.tdb	1670.67	NBSI2_C40 (x(Si) 0.66822) + LIQUID (x(Si) 0.96358) + DIAMOND_A4 (x(Si) 1)
NbSi-09Gen.tdb	2249.68	LIQUID (x(Si) 0.20304) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37523)
NbSi-09Gen.tdb	2249.68	LIQUID (x(Si) 0.20301) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37523)
NbSi-09Gen.tdb	2207.38	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37519)
NbSi-09Gen.tdb	2207.38	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37519)
NbSi-09Gen.tdb	2188.67	BCC_A2 (x(Si) 0.03812) + LIQUID (x(Si) 0.17307) + NB3SI (x(Si) 0.25)
NbSi-09Gen.tdb	2188.67	BCC_A2 (x(Si) 0.03811) + LIQUID (x(Si) 0.17304) + NB3SI (x(Si) 0.25)
NbSi-09Gen.tdb	2145.78	NB5SI3_D8M (x(Si) 0.40798) + LIQUID (x(Si) 0.57677) + NBSI2_C40 (x(Si) 0.66667)
NbSi-09Gen.tdb	1946.12	BCC_A2 (x(Si) 0.02618) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-09Gen.tdb	1946.12	BCC_A2 (x(Si) 0.02618) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-09Gen.tdb	1946.12	BCC_A2 (x(Si) 0.02616) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-09Gen.tdb	1946.12	BCC_A2 (x(Si) 0.02616) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-09Gen.tdb	1920.62	NB5SI3_D8L (x(Si) 0.38199) + NB5SI3_D8M (x(Si) 0.40297) + NBSI2_C40 (x(Si) 0.66667)
NbSi-09Gen.tdb	1920.61	NB5SI3_D8L (x(Si) 0.38203) + NB5SI3_D8M (x(Si) 0.40299) + NBSI2_C40 (x(Si) 0.66667)
NbSi-09Gen.tdb	1679.92	NBSI2_C40 (x(Si) 0.66825) + LIQUID (x(Si) 0.98317) + DIAMOND_A4 (x(Si) 1)
NbSi-10Gen.tdb	2249.59	LIQUID (x(Si) 0.20299) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37506)
NbSi-10Gen.tdb	2249.59	LIQUID (x(Si) 0.20296) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37506)
NbSi-10Gen.tdb	2206.9	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37504)
NbSi-10Gen.tdb	2206.9	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37504)
NbSi-10Gen.tdb	2188.67	BCC_A2 (x(Si) 0.03812) + LIQUID (x(Si) 0.17307) + NB3SI (x(Si) 0.25)
NbSi-10Gen.tdb	2188.67	BCC_A2 (x(Si) 0.03811) + LIQUID (x(Si) 0.17304) + NB3SI (x(Si) 0.25)
NbSi-10Gen.tdb	2145.78	NB5SI3_D8M (x(Si) 0.40798) + LIQUID (x(Si) 0.57677) + NBSI2_C40 (x(Si) 0.66667)
NbSi-10Gen.tdb	1946.12	BCC_A2 (x(Si) 0.02618) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-10Gen.tdb	1946.12	BCC_A2 (x(Si) 0.02618) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-10Gen.tdb	1946.12	BCC_A2 (x(Si) 0.02616) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-10Gen.tdb	1946.12	BCC_A2 (x(Si) 0.02616) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-10Gen.tdb	1920.62	NB5SI3_D8L (x(Si) 0.38199) + NB5SI3_D8M (x(Si) 0.40297) + NBSI2_C40 (x(Si) 0.66667)
NbSi-10Gen.tdb	1920.61	NB5SI3_D8L (x(Si) 0.38201) + NB5SI3_D8M (x(Si) 0.40298) + NBSI2_C40 (x(Si) 0.66667)
NbSi-10Gen.tdb	1679.92	NBSI2_C40 (x(Si) 0.66825) + LIQUID (x(Si) 0.98317) + DIAMOND_A4 (x(Si) 1)
NbSi-13Li.tdb	2253.4	LIQUID (x(Si) 0.20461) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37505)
NbSi-13Li.tdb	2253.39	LIQUID (x(Si) 0.20464) + NB3SI (x(Si) 0.25) + NB5SI3_D8M (x(Si) 0.37505)
NbSi-13Li.tdb	2207.02	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37502)
NbSi-13Li.tdb	2207.02	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + NB5SI3_D8M (x(Si) 0.37502)
NbSi-13Li.tdb	2189.01	BCC_A2 (x(Si) 0.03809) + LIQUID (x(Si) 0.173) + NB3SI (x(Si) 0.25)
NbSi-13Li.tdb	2189.01	BCC_A2 (x(Si) 0.03807) + LIQUID (x(Si) 0.17298) + NB3SI (x(Si) 0.25)
NbSi-13Li.tdb	2146.66	NB5SI3_D8M (x(Si) 0.40814) + LIQUID (x(Si) 0.57635) + NBSI2_C40 (x(Si) 0.66667)
NbSi-13Li.tdb	1946.12	BCC_A2 (x(Si) 0.02627) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-13Li.tdb	1946.12	BCC_A2 (x(Si) 0.02628) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-13Li.tdb	1946.12	BCC_A2 (x(Si) 0.02625) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-13Li.tdb	1946.12	BCC_A2 (x(Si) 0.02625) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-13Li.tdb	1917.5	NB5SI3_D8L (x(Si) 0.38169) + NB5SI3_D8M (x(Si) 0.40271) + NBSI2_C40 (x(Si) 0.66667)
NbSi-13Li.tdb	1917.5	NB5SI3_D8L (x(Si) 0.3817) + NB5SI3_D8M (x(Si) 0.40271) + NBSI2_C40 (x(Si) 0.66667)
NbSi-13Li.tdb	1680.49	NBSI2_C40 (x(Si) 0.66826) + LIQUID (x(Si) 0.98467) + DIAMOND_A4 (x(Si) 1)
NbSi-16Jac.tdb	2254.58	LIQUID (x(Si) 0.1971) + NB3SI (x(Si) 0.25) + M5SI3_D8M (x(Si) 0.37511)
NbSi-16Jac.tdb	2209.1	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + M5SI3_D8M (x(Si) 0.37508)
NbSi-16Jac.tdb	2209.1	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + M5SI3_D8M (x(Si) 0.37508)
NbSi-16Jac.tdb	2192.82	BCC_A2 (x(Si) 0.00816) + LIQUID (x(Si) 0.16621) + NB3SI (x(Si) 0.25)
NbSi-16Jac.tdb	2192.82	BCC_A2 (x(Si) 0.00816) + LIQUID (x(Si) 0.16616) + NB3SI (x(Si) 0.25)
NbSi-16Jac.tdb	2108.25	M5SI3_D8M (x(Si) 0.40587) + LIQUID (x(Si) 0.58611) + MSI2_C40 (x(Si) 0.66667)
NbSi-16Jac.tdb	1960.33	BCC_A2 (x(Si) 0.00569) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-16Jac.tdb	1960.33	BCC_A2 (x(Si) 0.00569) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-16Jac.tdb	1960.33	BCC_A2 (x(Si) 0.00568) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-16Jac.tdb	1960.33	BCC_A2 (x(Si) 0.00568) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-16Jac.tdb	1909.79	NB5SI3_D8L (x(Si) 0.375) + M5SI3_D8M (x(Si) 0.4006) + MSI2_C40 (x(Si) 0.66667)
NbSi-16Jac.tdb	1909.79	NB5SI3_D8L (x(Si) 0.375) + M5SI3_D8M (x(Si) 0.40061) + MSI2_C40 (x(Si) 0.66667)
NbSi-16Jac.tdb	1673.52	MSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.96656) + DIAMOND_A4 (x(Si) 1)
NbSi-16Jac.tdb	1673.52	MSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.96699) + DIAMOND_A4 (x(Si) 1)
NbSi-17Jac.tdb	2250.46	LIQUID (x(Si) 0.20319) + NB3SI (x(Si) 0.25) + M5SI3_D8M (x(Si) 0.37523)
NbSi-17Jac.tdb	2250.46	LIQUID (x(Si) 0.20316) + NB3SI (x(Si) 0.25) + M5SI3_D8M (x(Si) 0.37523)
NbSi-17Jac.tdb	2207.32	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + M5SI3_D8M (x(Si) 0.37519)
NbSi-17Jac.tdb	2207.32	NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375) + M5SI3_D8M (x(Si) 0.37519)
NbSi-17Jac.tdb	2189.04	BCC_A2 (x(Si) 0.03808) + LIQUID (x(Si) 0.173) + NB3SI (x(Si) 0.25)
NbSi-17Jac.tdb	2189.04	BCC_A2 (x(Si) 0.03807) + LIQUID (x(Si) 0.17297) + NB3SI (x(Si) 0.25)
NbSi-17Jac.tdb	2145.78	M5SI3_D8M (x(Si) 0.40798) + LIQUID (x(Si) 0.57677) + MSI2_C40 (x(Si) 0.66667)
NbSi-17Jac.tdb	1944.2	BCC_A2 (x(Si) 0.02604) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-17Jac.tdb	1944.2	BCC_A2 (x(Si) 0.02602) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-17Jac.tdb	1944.2	BCC_A2 (x(Si) 0.02602) + NB3SI (x(Si) 0.25) + NB5SI3_D8L (x(Si) 0.375)
NbSi-17Jac.tdb	1906.78	NB5SI3_D8L (x(Si) 0.375) + M5SI3_D8M (x(Si) 0.40267) + MSI2_C40 (x(Si) 0.66667)
NbSi-17Jac.tdb	1906.77	NB5SI3_D8L (x(Si) 0.375) + M5SI3_D8M (x(Si) 0.40266) + MSI2_C40 (x(Si) 0.66667)
NbSi-17Jac.tdb	1679.89	MSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.9828) + DIAMOND_A4 (x(Si) 1)
NbSi-17Jac.tdb	1679.88	MSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.98307) + DIAMOND_A4 (x(Si) 1)
NbSi-99Lia.tdb	2248.62	LIQUID (x(Si) 0.16909) + NB3SI (x(Si) 0.25) + NB5SI3 (x(Si) 0.375)
NbSi-99Lia.tdb	2248.62	LIQUID (x(Si) 0.16905) + NB3SI (x(Si) 0.25) + NB5SI3 (x(Si) 0.375)
NbSi-99Lia.tdb	2248.62	LIQUID (x(Si) 0.16903) + NB3SI (x(Si) 0.25) + NB5SI3 (x(Si) 0.375)
NbSi-99Lia.tdb	2187.96	BCC_A2 (x(Si) 0.0258) + LIQUID (x(Si) 0.1523) + NB3SI (x(Si) 0.25)
NbSi-99Lia.tdb	2187.96	BCC_A2 (x(Si) 0.0258) + LIQUID (x(Si) 0.15229) + NB3SI (x(Si) 0.25)
NbSi-99Lia.tdb	2176.94	NB5SI3 (x(Si) 0.375) + LIQUID (x(Si) 0.60666) + NBSI2_C40 (x(Si) 0.66667)
NbSi-99Lia.tdb	2176.94	NB5SI3 (x(Si) 0.375) + LIQUID (x(Si) 0.60638) + NBSI2_C40 (x(Si) 0.66667)
NbSi-99Lia.tdb	1943.06	BCC_A2 (x(Si) 0.01341) + NB3SI (x(Si) 0.25) + NB5SI3 (x(Si) 0.375)
NbSi-99Lia.tdb	1943.06	BCC_A2 (x(Si) 0.0134) + NB3SI (x(Si) 0.25) + NB5SI3 (x(Si) 0.375)
NbSi-99Lia.tdb	1943.06	BCC_A2 (x(Si) 0.0134) + NB3SI (x(Si) 0.25) + NB5SI3 (x(Si) 0.375)
NbSi-99Lia.tdb	1662.23	NBSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.95821) + DIAMOND_A4 (x(Si) 1)
NbSi-99Lia.tdb	1662.23	NBSI2_C40 (x(Si) 0.66667) + LIQUID (x(Si) 0.95822) + DIAMOND_A4 (x(Si) 1)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull NbSi-02Fer-alt · CALPHAD hull NbSi-02Fer · CALPHAD hull NbSi-03Yan · CALPHAD hull NbSi-04Sha · CALPHAD hull NbSi-06Dav · CALPHAD hull NbSi-09Gen · CALPHAD hull NbSi-10Gen · CALPHAD hull NbSi-13Li · CALPHAD hull NbSi-16Jac · CALPHAD hull NbSi-99Lia

Invariant reactions (literature)

Invariant reactions reported in the literature for the Nb–Si system (104)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location	Quote
2270.15	L + βNb5Si3 -> Nb3Si	L: Si 0.198; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[1] Shao 2004 cites Fernandes 2002 doi	Table 2, p. 5, row 7 report
2270	L + βNb5Si3 -> Nb3Si	L: Si 0.198; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 12 report
2259.15	Liq + βNb5Si3->Nb3Si	Liq: Si 0.202; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[3] Yang 2003	Table 2, p. 2, row 4 report
2259.15	L + βNb5Si3 -> Nb3Si	L: Si 0.202; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[1] Shao 2004 cites Yang 2003 doi	Table 2, p. 5, row 6 report
2259	L + βNb5Si3 -> Nb3Si	L: Si 0.202; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[2] David 2006 cites Yang 2003 doi	Table 6, p. 7, row 14 report
2257	L + βNb5Si3 -> Nb3Si	L: Si 0.211; βNb5Si3: Si 0.377; Nb3Si: Si 0.25	model	[2] David 2006 cites Shao 2004 doi	Table 6, p. 7, row 15 report
2253.15	Liq + βNb5Si3->Nb3Si	Liq: Si 0.195; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	experimental	[3] Yang 2003 cites Kocherzhinskiy 1980	Table 2, p. 2, row 5 report
2253.15	L + Nb5Si3 -> Nb3Si	L: Si 0.195; Nb5Si3: Si 0.375; Nb3Si: Si 0.25	experimental	[4] Liang 1999 cites Kocherzhinskiy 1980	Table 1, p. 2, row 4 report
2253.15	peritectic: peritectic reaction		experimental	[4] Liang 1999 cites Kocherzhinskiy 1980	p. 2 report	The Nb3Si phase is formed by a peritectic reaction at 1980 C [14]; however, the decomposition temperature of this phase is less certain.
2253	L + βNb5Si3 -> Nb3Si	L: Si 0.195; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[2] David 2006 cites Okamoto 1990	Table 6, p. 7, row 9 report
2250.15	L + β(Nb5Si3) -> Nb3Si	L: Si 0.203; β(Nb5Si3): Si 0.375; Nb3Si: Si 0.25	model	[5] Geng 2009	Table 2, p. 3, row 3 report
2249.15	L + β(Nb5Si3) -> Nb3Si	L: Si 0.188; β(Nb5Si3): Si 0.375; Nb3Si: Si 0.25	model	[5] Geng 2009 cites David 2006 doi	Table 2, p. 3, row 4 report
2249	L + βNb5Si3 -> Nb3Si	L: Si 0.188; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[2] David 2006	Table 6, p. 7, row 16 report
2248.15	L + Nb5Si3 -> Nb3Si	L: Si 0.17; Nb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[4] Liang 1999	Table 1, p. 2, row 3 report
2248.15	L + βNb5Si3 -> Nb3Si	L: Si 0.195; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[1] Shao 2004 cites Schlesinger 1993 doi	Table 2, p. 5, row 5 report
2248	L + βNb5Si3 -> Nb3Si	L: Si 0.17; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[2] David 2006 cites Liang 1999 doi	Table 6, p. 7, row 11 report
2248	L + βNb5Si3 -> Nb3Si	L: Si 0.195; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[2] David 2006 cites Schlesinger 1993 doi	Table 6, p. 7, row 10 report
2241	L + βNb5Si3 -> Nb3Si	L: Si 0.186; βNb5Si3: Si 0.375; Nb3Si: Si 0.25	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 13 report
2220.15	βNb5Si3 + Nb3Si->Nb5Si3	βNb5Si3: Si 0.375; Nb3Si: Si 0.25; Nb5Si3: Si 0.375	model	[3] Yang 2003	Table 2, p. 2, row 17 report
2220	βNb5Si3 + NbSi3 -> αNb5Si3	βNb5Si3: Si 0.375; NbSi3: Si 0.25; αNb5Si3: Si 0.375	model	[2] David 2006 cites Yang 2003 doi	Table 6, p. 7, row 52 report
2213.15	βNb5Si3 + Nb3Si->Nb5Si3	βNb5Si3: Si 0.375; Nb3Si: Si 0.25; Nb5Si3: Si 0.375	experimental	[3] Yang 2003 cites Kocherzhinskiy 1980	Table 2, p. 2, row 18 report
2213	βNb5Si3 + NbSi3 -> αNb5Si3	βNb5Si3: Si 0.375; NbSi3: Si 0.25; αNb5Si3: Si 0.375	model	[2] David 2006 cites Okamoto 1990	Table 6, p. 7, row 48 report
2212	βNb5Si3 + NbSi3 -> αNb5Si3	βNb5Si3: Si 0.375; NbSi3: Si 0.25; αNb5Si3: Si 0.375	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 51 report
2211.15	eutectic: L -> (Nb) + Nb3Si	L: Si 0.17; (Nb): Si 0.034; Nb3Si: Si 0.25	model	[1] Shao 2004 cites Fernandes 2002 doi	Table 2, p. 5, row 3 report
2211	eutectic: L -> (Nb) + Nb3Si	L: Si 0.17; (Nb): Si 0.034; Nb3Si: Si 0.25	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 4 report
2209.15	Nb3Si + β(Nb5Si3) -> α(Nb5Si3)	Nb3Si: Si 0.25; β(Nb5Si3): Si 0.375; α(Nb5Si3): Si 0.375	model	[5] Geng 2009 cites David 2006 doi	Table 2, p. 3, row 8 report
2209	βNb5Si3 + NbSi3 -> αNb5Si3	βNb5Si3: Si 0.375; NbSi3: Si 0.25; αNb5Si3: Si 0.375	model	[2] David 2006	Table 6, p. 7, row 54 report
2208	βNb5Si3 + NbSi3 -> αNb5Si3	βNb5Si3: Si 0.375; NbSi3: Si 0.25; αNb5Si3: Si 0.375	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 50 report
2208	βNb5Si3 + NbSi3 -> αNb5Si3	βNb5Si3: Si 0.375; NbSi3: Si 0.25; αNb5Si3: Si 0.375	model	[2] David 2006 cites Schlesinger 1993 doi	Table 6, p. 7, row 49 report
2207.15	Nb3Si + β(Nb5Si3) -> α(Nb5Si3)	Nb3Si: Si 0.25; β(Nb5Si3): Si 0.375; α(Nb5Si3): Si 0.375	model	[5] Geng 2009	Table 2, p. 3, row 7 report
2206	eutectic: L -> (Nb) + Nb3Si	L: Si 0.169; (Nb): Si 0.036; Nb3Si: Si 0.25	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 5 report
2204	βNb5Si3 + NbSi3 -> αNb5Si3	βNb5Si3: Si 0.375; NbSi3: Si 0.25; αNb5Si3: Si 0.375	model	[2] David 2006 cites Shao 2004 doi	Table 6, p. 7, row 53 report
2193.15	Liq->β(Nb,Si) + Nb3Si	Liq: Si 0.175; β(Nb,Si): Si 0.035; Nb3Si: Si 0.25	experimental	[3] Yang 2003 cites Kocherzhinskiy 1980	Table 2, p. 2, row 2 report
2193.15	L(Nb) + Nb3Si	L: Si 0.175; (Nb): Si 0.035; Nb3Si: Si 0.25	experimental	[4] Liang 1999 cites Kocherzhinskiy 1980	Table 1, p. 2, row 2 report
2193	eutectic: L -> (Nb) + Nb3Si	L: Si 0.187; (Nb): Si 0.035; Nb3Si: Si 0.25	model	[2] David 2006 cites Okamoto 1990	Table 6, p. 7, row 1 report
2189.15	eutectic: L -> (Nb) + Nb3Si	L: Si 0.173; (Nb): Si 0.038; Nb3Si: Si 0.25	model	[5] Geng 2009	Table 2, p. 3, row 1 report
2189.15	eutectic: L -> (Nb) + Nb3Si	L: Si 0.178; (Nb): Si 0.034; Nb3Si: Si 0.25	model	[1] Shao 2004 cites Yang 2003 doi	Table 2, p. 5, row 2 report
2189.15	Liq->β(Nb,Si) + Nb3Si	Liq: Si 0.178; β(Nb,Si): Si 0.034; Nb3Si: Si 0.25	model	[3] Yang 2003	Table 2, p. 2, row 1 report
2189	eutectic: L -> (Nb) + Nb3Si	L: Si 0.178; (Nb): Si 0.034; Nb3Si: Si 0.25	model	[2] David 2006 cites Yang 2003 doi	Table 6, p. 7, row 6 report
2188.15	eutectic: L -> (Nb) + Nb3Si	L: Si 0.162; (Nb): Si 0.027; Nb3Si: Si 0.25	model	[5] Geng 2009 cites David 2006 doi	Table 2, p. 3, row 2 report
2188.15	L(Nb) + Nb3Si	L: Si 0.153; (Nb): Si 0.0258; Nb3Si: Si 0.25	model	[4] Liang 1999	Table 1, p. 2, row 1 report
2188.15	eutectic: L -> (Nb) + Nb3Si	L: Si 0.175; (Nb): Si 0.035; Nb3Si: Si 0.25	model	[1] Shao 2004 cites Schlesinger 1993 doi	Table 2, p. 5, row 1 report
2188	eutectic: L -> (Nb) + Nb3Si	L: Si 0.153; (Nb): Si 0.0258; Nb3Si: Si 0.25	model	[2] David 2006 cites Liang 1999 doi	Table 6, p. 7, row 3 report
2188	eutectic: L -> (Nb) + Nb3Si	L: Si 0.175; (Nb): Si 0.035; Nb3Si: Si 0.25	model	[2] David 2006 cites Schlesinger 1993 doi	Table 6, p. 7, row 2 report
2188	eutectic: L -> (Nb) + Nb3Si	L: Si 0.162; (Nb): Si 0.027; Nb3Si: Si 0.25	model	[2] David 2006	Table 6, p. 7, row 8 report
2185.15	eutectic: L -> (Nb) + Nb3Si	L: Si 0.174; (Nb): Si 0.0386; Nb3Si: Si 0.25	model	[1] Shao 2004	Table 2, p. 5, row 4 report
2185	eutectic: L -> (Nb) + Nb3Si	L: Si 0.174; (Nb): Si 0.0386; Nb3Si: Si 0.25	model	[2] David 2006 cites Shao 2004 doi	Table 6, p. 7, row 7 report
2177.15	eutectic: L -> Nb5Si3 + NbSi2	L: Si 0.607; Nb5Si3: Si 0.375; NbSi2: Si 0.667	model	[4] Liang 1999	Table 1, p. 2, row 7 report
2177	eutectic: L -> βNb5Si3 + NbSi2	L: Si 0.607; βNb5Si3: Si 0.375; NbSi2: Si 0.667	model	[2] David 2006 cites Liang 1999 doi	Table 6, p. 7, row 27 report
2173.15	eutectic: L -> Nb5Si3 + NbSi2	L: Si 0.57; Nb5Si3: Si 0.405; NbSi2: Si 0.667	experimental	[4] Liang 1999 cites Kocherzhinskiy 1980	Table 1, p. 2, row 8 report
2173.15	eutectic: Liq->βNb5Si3 + NbSi2	Liq: Si 0.57; βNb5Si3: Si 0.405; NbSi2: Si 0.667	experimental	[3] Yang 2003 cites Kocherzhinskiy 1980	Table 2, p. 2, row 11 report
2173	eutectic: L -> βNb5Si3 + NbSi2	L: Si 0.57; βNb5Si3: Si 0.385; NbSi2: Si 0.667	model	[2] David 2006 cites Okamoto 1990	Table 6, p. 7, row 25 report
2169	eutectic: L -> βNb5Si3 + NbSi2	L: Si 0.578; βNb5Si3: Si 0.4; NbSi2: Si 0.667	model	[2] David 2006 cites Shao 2004 doi	Table 6, p. 7, row 31 report
2168	eutectic: L -> βNb5Si3 + NbSi2	L: Si 0.57; βNb5Si3: Si 0.405; NbSi2: Si 0.667	model	[2] David 2006 cites Schlesinger 1993 doi	Table 6, p. 7, row 26 report
2160.15	eutectic: L -> β(Nb5Si3) + (NbSi2)	L: Si 0.592; β(Nb5Si3): Si 0.407; (NbSi2): Si 0.667	model	[5] Geng 2009 cites David 2006 doi	Table 2, p. 3, row 10 report
2160	eutectic: L -> βNb5Si3 + NbSi2	L: Si 0.592; βNb5Si3: Si 0.407; NbSi2: Si 0.667	model	[2] David 2006	Table 6, p. 7, row 32 report
2151.15	eutectic: Liq->βNb5Si3 + NbSi2	Liq: Si 0.578; βNb5Si3: Si 0.401; NbSi2: Si 0.667	model	[3] Yang 2003	Table 2, p. 2, row 10 report
2151	eutectic: L -> βNb5Si3 + NbSi2	L: Si 0.578; βNb5Si3: Si 0.401; NbSi2: Si 0.667	model	[2] David 2006 cites Yang 2003 doi	Table 6, p. 7, row 30 report
2151	eutectic: L -> βNb5Si3 + NbSi2	L: Si 0.58; βNb5Si3: Si 0.404; NbSi2: Si 0.667	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 29 report
2146.15	eutectic: L -> β(Nb5Si3) + (NbSi2)	L: Si 0.577; β(Nb5Si3): Si 0.408; (NbSi2): Si 0.667	model	[5] Geng 2009	Table 2, p. 3, row 9 report
2141	eutectic: L -> βNb5Si3 + NbSi2	L: Si 0.574; βNb5Si3: Si 0.394; NbSi2: Si 0.667	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 28 report
2138.15	eutectic: Liq->βNb5Si3 + NbSi2	βNb5Si3: Si 0.375; NbSi2: Si 0.666667	experimental	[3] Yang 2003 cites Fernandes 2002 doi	Table 2, p. 2, row 12 report
2043.15	Nb3Si->β(Nb,Si) + Nb5Si3	Nb3Si: Si 0.25; β(Nb,Si): Si 0.024; Nb5Si3: Si 0.375	experimental	[3] Yang 2003 cites Kocherzhinskiy 1980	Table 2, p. 2, row 7 report
2043.15	eutectoid: Nb3Si=(Nb)+Nb5Si3		experimental	[4] Liang 1999 cites Kocherzhinskiy 1980	p. 2 report	Since the eutectoid reaction, Nb3Si=(Nb)+Nb5Si3, is extremely slow, the measured temperature of Mendiratta and Dimiduk [23] by isothermal measurements, i.e. 1670 C, is accepted rather than that of Kocherzhinskiy et al. [14] by DTA analysis, i.e. 1770 C.
2043	Nb3Si -> (Nb) + βNb5Si3	Nb3Si: Si 0.25; (Nb): Si 0.005; βNb5Si3: Si 0.375	model	[2] David 2006 cites Okamoto 1990	Table 6, p. 7, row 17 report
2038	Nb3Si -> (Nb) + βNb5Si3	Nb3Si: Si 0.25; (Nb): Si 0.016; βNb5Si3: Si 0.375	model	[2] David 2006 cites Schlesinger 1993 doi	Table 6, p. 7, row 18 report
1975.15	Nb3Si -> (Bcc) + β(Nb5Si3)	Nb3Si: Si 0.25; (Bcc): Si 0.018; β(Nb5Si3): Si 0.375	model	[5] Geng 2009 cites David 2006 doi	Table 2, p. 3, row 6 report
1975	Nb3Si -> (Nb) + βNb5Si3	Nb3Si: Si 0.25; (Nb): Si 0.018; βNb5Si3: Si 0.375	model	[2] David 2006	Table 6, p. 7, row 24 report
1973.15	Nb3Si->β(Nb,Si) + Nb5Si3	Nb3Si: Si 0.25; β(Nb,Si): Si 0.028; Nb5Si3: Si 0.375	model	[3] Yang 2003	Table 2, p. 2, row 6 report
1973.15	Nb3Si->β(Nb,Si) + Nb5Si3	Nb3Si: Si 0.25; β(Nb,Si): Si 0.5; Nb5Si3: Si 0.375	experimental	[3] Yang 2003 cites Bewlay 2001	Table 2, p. 2, row 8 report
1973	Nb3Si -> (Nb) + βNb5Si3	Nb3Si: Si 0.25; (Nb): Si 0.028; βNb5Si3: Si 0.375	model	[2] David 2006 cites Yang 2003 doi	Table 6, p. 7, row 22 report
1966	Nb3Si -> (Nb) + βNb5Si3	Nb3Si: Si 0.25; (Nb): Si 0.031; βNb5Si3: Si 0.375	model	[2] David 2006 cites Shao 2004 doi	Table 6, p. 7, row 23 report
1952	Nb3Si -> (Nb) + βNb5Si3	Nb3Si: Si 0.25; (Nb): Si 0.021; βNb5Si3: Si 0.375	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 20 report
1946.15	Nb3Si -> (Bcc) + β(Nb5Si3)	Nb3Si: Si 0.25; (Bcc): Si 0.026; β(Nb5Si3): Si 0.375	model	[5] Geng 2009	Table 2, p. 3, row 5 report
1943.15	eutectoid: Nb3Si=(Nb)+Nb5Si3		experimental	[4] Liang 1999 cites Mendiratta 1991 doi	p. 2 report	Since the eutectoid reaction, Nb3Si=(Nb)+Nb5Si3, is extremely slow, the measured temperature of Mendiratta and Dimiduk [23] by isothermal measurements, i.e. 1670 C, is accepted rather than that of Kocherzhinskiy et al. [14] by DTA analysis, i.e. 1770 C.
1943.15	Nb3Si -> (Nb) + Nb5Si3	Nb3Si: Si 0.25; (Nb): Si 0.0134; Nb5Si3: Si 0.375	model	[4] Liang 1999	Table 1, p. 2, row 5 report
1943.15	Nb3Si->β(Nb,Si) + Nb5Si3	Nb3Si: Si 0.25; β(Nb,Si): Si 0.5; Nb5Si3: Si 0.375	experimental	[3] Yang 2003 cites Mendiratta 1991 doi	Table 2, p. 2, row 9 report
1943.15	Nb3Si -> (Nb) + Nb5Si3	Nb3Si: Si 0.25; (Nb): Si 0.016; Nb5Si3: Si 0.375	experimental	[4] Liang 1999 cites Mendiratta 1991 doi	Table 1, p. 2, row 6 report
1943	Nb3Si -> (Nb) + βNb5Si3	Nb3Si: Si 0.25; (Nb): Si 0.0134; βNb5Si3: Si 0.375	model	[2] David 2006 cites Liang 1999 doi	Table 6, p. 7, row 19 report
1940	Nb3Si -> (Nb) + βNb5Si3	Nb3Si: Si 0.25; (Nb): Si 0.021; βNb5Si3: Si 0.375	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 21 report
1926.15	β(Nb5Si3) -> α(Nb5Si3) + (NbSi2)	β(Nb5Si3): Si 0.401; α(Nb5Si3): Si 0.382; (NbSi2): Si 0.667	model	[5] Geng 2009 cites David 2006 doi	Table 2, p. 3, row 12 report
1926	βNb5Si3 -> αNb5Si3 + NbSi2	βNb5Si3: Si 0.401; αNb5Si3: Si 0.382; NbSi2: Si 0.667	model	[2] David 2006	Table 6, p. 7, row 47 report
1925	βNb5Si3 -> αNb5Si3 + NbSi2	βNb5Si3: Si 0.401; αNb5Si3: Si 0.375; NbSi2: Si 0.667	model	[2] David 2006 cites Shao 2004 doi	Table 6, p. 7, row 46 report
1923.15	βNb5Si3->Nb5Si3 + NbSi2	βNb5Si3: Si 0.395; Nb5Si3: Si 0.375; NbSi2: Si 0.667	experimental	[3] Yang 2003 cites Kocherzhinskiy 1980	Table 2, p. 2, row 16 report
1923	βNb5Si3 -> αNb5Si3 + NbSi2	βNb5Si3: Si 0.395; αNb5Si3: Si 0.385; NbSi2: Si 0.667	model	[2] David 2006 cites Okamoto 1990	Table 6, p. 7, row 41 report
1922	βNb5Si3 -> αNb5Si3 + NbSi2	βNb5Si3: Si 0.395; αNb5Si3: Si 0.375; NbSi2: Si 0.667	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 43 report
1921.15	β(Nb5Si3) -> α(Nb5Si3) + (NbSi2)	β(Nb5Si3): Si 0.403; α(Nb5Si3): Si 0.382; (NbSi2): Si 0.667	model	[5] Geng 2009	Table 2, p. 3, row 11 report
1918	βNb5Si3 -> αNb5Si3 + NbSi2	βNb5Si3: Si 0.395; αNb5Si3: Si 0.385; NbSi2: Si 0.667	model	[2] David 2006 cites Schlesinger 1993 doi	Table 6, p. 7, row 42 report
1918	βNb5Si3 -> αNb5Si3 + NbSi2	βNb5Si3: Si 0.395; αNb5Si3: Si 0.375; NbSi2: Si 0.667	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 44 report
1915.15	βNb5Si3->Nb5Si3 + NbSi2	βNb5Si3: Si 0.395; Nb5Si3: Si 0.375; NbSi2: Si 0.667	model	[3] Yang 2003	Table 2, p. 2, row 15 report
1915	βNb5Si3 -> αNb5Si3 + NbSi2	βNb5Si3: Si 0.395; αNb5Si3: Si 0.375; NbSi2: Si 0.667	model	[2] David 2006 cites Yang 2003 doi	Table 6, p. 7, row 45 report
1680.15	eutectic: L -> Nb(Ti)Si2 + Si	L: Si 0.983; Nb(Ti)Si2: Si 0.669; Si: Si 1	model	[5] Geng 2009	Table 2, p. 3, row 13 report
1679.15	eutectic: Liq->NbSi2 + (Si)	Liq: Si 0.982; NbSi2: Si 0.667; (Si): Si 1	model	[3] Yang 2003	Table 2, p. 2, row 13 report
1679	eutectic: L -> NbSi2 + (Si)	L: Si 0.982; NbSi2: Si 0.667; (Si): Si 1	model	[2] David 2006 cites Yang 2003 doi	Table 6, p. 7, row 38 report
1679	eutectic: L -> NbSi2 + (Si)	L: Si 0.982; NbSi2: Si 0.667; (Si): Si 1	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 36 report
1679	eutectic: L -> NbSi2 + (Si)	L: Si 0.982; NbSi2: Si 0.667; (Si): Si 1	model	[2] David 2006 cites Shao 2004 doi	Table 6, p. 7, row 39 report
1673.15	eutectic: L -> NbSi2 + (Si)	L: Si 0.98; NbSi2: Si 0.688; (Si): Si 1	experimental	[4] Liang 1999 cites Kocherzhinskiy 1980	Table 1, p. 2, row 10 report
1673.15	eutectic: Liq->NbSi2 + (Si)	Liq: Si 0.98; NbSi2: Si 0.667; (Si): Si 1	experimental	[3] Yang 2003 cites Kocherzhinskiy 1980	Table 2, p. 2, row 14 report
1673	eutectic: L -> NbSi2 + (Si)	L: Si 0.98; NbSi2: Si 0.667; (Si): Si 1	model	[2] David 2006 cites Okamoto 1990	Table 6, p. 7, row 33 report
1671.15	eutectic: L -> Nb(Ti)Si2 + Si	L: Si 0.964; Nb(Ti)Si2: Si 0.668; Si: Si 1	model	[5] Geng 2009 cites David 2006 doi	Table 2, p. 3, row 14 report
1671	eutectic: L -> NbSi2 + (Si)	L: Si 0.964; NbSi2: Si 0.668; (Si): Si 1	model	[2] David 2006	Table 6, p. 7, row 40 report
1668	eutectic: L -> NbSi2 + (Si)	L: Si 0.98; NbSi2: Si 0.667; (Si): Si 1	model	[2] David 2006 cites Schlesinger 1993 doi	Table 6, p. 7, row 34 report
1663.15	eutectic: L -> NbSi2 + (Si)	L: Si 0.958; NbSi2: Si 0.667; (Si): Si 1	model	[4] Liang 1999	Table 1, p. 2, row 9 report
1663	eutectic: L -> NbSi2 + (Si)	L: Si 0.958; NbSi2: Si 0.667; (Si): Si 1	model	[2] David 2006 cites Liang 1999 doi	Table 6, p. 7, row 35 report

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, Nb–Si system (83)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
(NbSi2)	NbSi2	-53.7 kJ/mol-atom ± 1.6	273.15	experimental	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[5] Geng 2009 cites Meschel 1998 doi	Table 3, p. 4, row 10 report
(NbSi2)	NbSi2	-51.2033 kJ/mol-atom	273.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[5] Geng 2009	Table 3, p. 4, row 7 report
(NbSi2)	NbSi2	-46 kJ/mol-atom	273.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[5] Geng 2009 cites Barin 1977	Table 3, p. 4, row 8 report
(NbSi2)	NbSi2	-46 kJ/mol-atom	273.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[5] Geng 2009 cites Chart 1973	Table 3, p. 4, row 9 report
Nb3Si		-37.3 kJ/mol (basis unstated)	0	DFT			[6] Utton 2017 cites Papadimitriou 2015 doi	Table 2, p. 6, row 11 report
Nb3Si	Nb3Si	-35.85 kJ/mol-atom	298.15	model	-40.615 (mp-aaaabakm)	-42.633 (oqmd-2033)	[1] Shao 2004 cites Fernandes 2002 doi	Table 3, p. 6, row 4 report
Nb3Si		-34.73 kJ/mol (basis unstated)	0	DFT			[6] Utton 2017 cites Papadimitriou 2015 doi	Table 2, p. 6, row 15 report
Nb3Si		-33.75 per mol-atom	298.15	model			[1] Shao 2004 cites Fernandes 2002 doi	Table 3, p. 6, row 22 report
Nb3Si		-33.357 kJ/mol (basis unstated)	298.15	model			[6] Utton 2017	Table 2, p. 6, row 12 report
Nb3Si	Nb3Si	-33.163 kJ/mol-atom	298.15	model	-40.615 (mp-aaaabakm)	-42.633 (oqmd-2033)	[1] Shao 2004 cites Yang 2003 doi	Table 3, p. 6, row 1 report
Nb3Si		-32 kJ/mol (basis unstated)	298.15	model			[6] Utton 2017	Table 2, p. 6, row 16 report
Nb3Si	Nb3Si	-30.301 kJ/mol-atom	298.15	model	-40.615 (mp-aaaabakm)	-42.633 (oqmd-2033)	[1] Shao 2004 cites Liang 1999 doi	Table 3, p. 6, row 2 report
Nb3Si	Nb3Si	-29.6425 kJ/mol-atom	298.15	model	-40.615 (mp-aaaabakm)	-42.633 (oqmd-2033)	[1] Shao 2004	Table 3, p. 6, row 5 report
Nb3Si	Nb3Si	-28.175 kJ/mol-atom	298.15	model	-40.615 (mp-aaaabakm)	-42.633 (oqmd-2033)	[4] Liang 1999 cites Kaufman 1979 doi	Table 2, p. 4, row 9 report
Nb3Si	Nb3Si	-28.175 kJ/mol-atom	298.15	model	-40.615 (mp-aaaabakm)	-42.633 (oqmd-2033)	[1] Shao 2004 cites Kaufman 1979 doi	Table 3, p. 6, row 3 report
Nb5Si3	Nb5Si3	-64.792 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[1] Shao 2004 cites Yang 2003 doi	Table 3, p. 6, row 6 report
Nb5Si3	Nb5Si3	-64.6 kJ/mol-atom ± 2.4	298.15	experimental	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[1] Shao 2004 cites Meschel 1998 doi	Table 3, p. 6, row 9 report
Nb5Si3		-63.001 kJ/mol (basis unstated)	298.15	model			[6] Utton 2017	Table 2, p. 6, row 4 report
Nb5Si3		-62.658 per mol-atom	298.15	model			[1] Shao 2004 cites Fernandes 2002 doi	Table 3, p. 6, row 23 report
Nb5Si3		-61.2 kJ/mol (basis unstated)	0	DFT			[6] Utton 2017 cites Papadimitriou 2015 doi	Table 2, p. 6, row 3 report
Nb5Si3	Nb5Si3	-61 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[1] Shao 2004 cites Chart 1973	Table 3, p. 6, row 11 report
Nb5Si3	Nb5Si3	-60.887 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[1] Shao 2004	Table 3, p. 6, row 13 report
Nb5Si3	Nb5Si3	-60.887 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[1] Shao 2004 cites Fernandes 2002 doi	Table 3, p. 6, row 12 report
Nb5Si3		-58.2 kJ/mol (basis unstated)	0	DFT			[6] Utton 2017 cites Papadimitriou 2015 doi	Table 2, p. 6, row 7 report
Nb5Si3	Nb5Si3	-57 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[1] Shao 2004 cites Barin 2004	Table 3, p. 6, row 10 report
Nb5Si3	Nb5Si3	-52 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[1] Shao 2004 cites Liang 1999 doi	Table 3, p. 6, row 7 report
Nb5Si3		-50.636 kJ/mol (basis unstated)	298.15	model			[6] Utton 2017	Table 2, p. 6, row 8 report
Nb5Si3	Nb5Si3	-47.69 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[1] Shao 2004 cites Kaufman 1979 doi	Table 3, p. 6, row 8 report
NbSi2	NbSi2	-90.7 kJ/mol-atom	298.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[2] David 2006 cites Kaufman 1979 doi	Table 7, p. 8, row 3 report
NbSi2	NbSi2	-59.37 kJ/mol-atom	298.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[4] Liang 1999 cites Kaufman 1979 doi	Table 2, p. 4, row 7 report
NbSi2	NbSi2	-59.37 kJ/mol-atom	298.15	model	-48.426 (mp-aaaaadri)	-53.117 (oqmd-2027994)	[1] Shao 2004 cites Kaufman 1979 doi	Table 3, p. 6, row 19 report
NbSi2	NbSi2	-56 kJ/mol-atom	298.15	model	-48.426 (mp-aaaaadri)	-53.117 (oqmd-2027994)	[1] Shao 2004 cites Fernandes 2002 doi	Table 3, p. 6, row 20 report
NbSi2	NbSi2	-56 kJ/mol-atom	298.15	model	-48.426 (mp-aaaaadri)	-53.117 (oqmd-2027994)	[7] Fernandes 2002	Table 3, p. 6, row 7 report
NbSi2	NbSi2	-56 kJ/mol-atom	298.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[2] David 2006 cites Fernandes 2002 doi	Table 7, p. 8, row 8 report
NbSi2	NbSi2	-56 kJ/mol-atom	298.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[2] David 2006 cites Shao 2004 doi	Table 7, p. 8, row 10 report
NbSi2	NbSi2	-56 kJ/mol-atom	298.15	model	-48.426 (mp-aaaaadri)	-53.117 (oqmd-2027994)	[1] Shao 2004	Table 3, p. 6, row 21 report
NbSi2	NbSi2	-55.5 kJ/mol-atom	298.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[2] David 2006 cites Fernandes 2002 doi	Table 7, p. 8, row 7 report
NbSi2	NbSi2	-55.5 kJ/mol-atom	298.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[2] David 2006 cites Yang 2003 doi	Table 7, p. 8, row 9 report
NbSi2		-55.483 per mol-atom	298.15	model			[1] Shao 2004 cites Fernandes 2002 doi	Table 3, p. 6, row 24 report
NbSi2	NbSi2	-55.467 kJ/mol-atom	298.15	model	-48.426 (mp-aaaaadri)	-53.117 (oqmd-2027994)	[1] Shao 2004 cites Yang 2003 doi	Table 3, p. 6, row 17 report
NbSi2	NbSi2	-55.4667 kJ/mol-atom	298.15	model	-48.426 (mp-aaaaadri)	-53.117 (oqmd-2027994)	[7] Fernandes 2002	Table 3, p. 6, row 6 report
NbSi2	NbSi2	-53.7 kJ/mol-atom	298.15	experimental	-48.426 (mp-aaaaadri)	-53.117 (oqmd-2027994)	[7] Fernandes 2002 cites Meschel 1998 doi	Table 3, p. 6, row 8 report
NbSi2	NbSi2	-53.7 kJ/mol-atom	298.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[2] David 2006 cites Meschel 1998 doi	Table 7, p. 8, row 5 report
NbSi2	NbSi2	-53.7 kJ/mol-atom ± 1.6	298.15	experimental	-48.426 (mp-aaaaadri)	-53.117 (oqmd-2027994)	[1] Shao 2004 cites Meschel 1998 doi	Table 3, p. 6, row 15 report
NbSi2	NbSi2	-51.5 kJ/mol-atom	298.15	unspecified	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[2] David 2006	Table 7, p. 8, row 11 report
NbSi2		-51.2 kJ/mol (basis unstated)	298.15	model			[6] Utton 2017	Table 2, p. 6, row 20 report
NbSi2		-49.9 kJ/mol (basis unstated)	0	DFT			[6] Utton 2017 cites Papadimitriou 2015 doi	Table 2, p. 6, row 19 report
NbSi2	NbSi2	-47 kJ/mol-atom	298.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[4] Liang 1999	Table 2, p. 4, row 5 report
NbSi2	NbSi2	-47 kJ/mol-atom	298.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[2] David 2006 cites Liang 1999 doi	Table 7, p. 8, row 6 report
NbSi2	NbSi2	-47 kJ/mol-atom	298.15	model	-48.426 (mp-aaaaadri)	-53.117 (oqmd-2027994)	[1] Shao 2004 cites Liang 1999 doi	Table 3, p. 6, row 18 report
NbSi2	NbSi2	-46 kJ/mol-atom	298.15	model	-48.426 (mp-aaaaadri)	-53.117 (oqmd-2027994)	[1] Shao 2004 cites Chart 1973	Table 3, p. 6, row 14 report
NbSi2	NbSi2	-46 kJ/mol-atom	298.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[4] Liang 1999 cites Niessen 1981 doi	Table 2, p. 4, row 8 report
NbSi2	NbSi2	-46 kJ/mol-atom	298.15	unspecified	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[2] David 2006 cites Niessen 1981 doi	Table 7, p. 8, row 4 report
NbSi2	NbSi2	-46 kJ/mol-atom	298.15	model	-48.426 (mp-aaaaadri)	-53.117 (oqmd-2027994)	[1] Shao 2004 cites Barin 2004	Table 3, p. 6, row 16 report
NbSi2	NbSi2	-46 kJ/mol-atom ± 16	298.15	model	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[4] Liang 1999 cites Chart 1973	Table 2, p. 4, row 6 report
NbSi2	NbSi2	-46 kJ/mol-atom	298.15	experimental	-48.427 (mp-aaaaarxo)	-53.121 (oqmd-30789)	[2] David 2006 cites Chart 1973	Table 7, p. 8, row 2 report
α(Nb5Si3)	Nb5Si3	-65.379 kJ/mol-atom	273.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[5] Geng 2009 cites Fernandes 2002 doi	Table 3, p. 4, row 4 report
α(Nb5Si3)	Nb5Si3	-64.6 kJ/mol-atom ± 2.4	273.15	experimental	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[5] Geng 2009 cites Meschel 1998 doi	Table 3, p. 4, row 2 report
α(Nb5Si3)	Nb5Si3	-63.8 kJ/mol-atom	273.15	experimental	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[5] Geng 2009 cites Gorelkin 1972	Table 3, p. 4, row 3 report
α(Nb5Si3)	Nb5Si3	-63.0044 kJ/mol-atom	273.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[5] Geng 2009	Table 3, p. 4, row 1 report
α(Nb5Si3)	Nb5Si3	-61 kJ/mol-atom	273.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[5] Geng 2009 cites Chart 1973	Table 3, p. 4, row 6 report
α(Nb5Si3)	Nb5Si3	-57 kJ/mol-atom	273.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[5] Geng 2009 cites Barin 1977	Table 3, p. 4, row 5 report
α-Nb5Si3	Nb5Si3	-63.8 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[4] Liang 1999 cites Gorelkin 1972	Table 2, p. 4, row 2 report
α-Nb5Si3	Nb5Si3	-60.7 kJ/mol-atom ± 13	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[4] Liang 1999 cites Chart 1973	Table 2, p. 4, row 3 report
α-Nb5Si3	Nb5Si3	-52 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[4] Liang 1999	Table 2, p. 4, row 1 report
α-Nb5Si3	Nb5Si3	-47.69 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[4] Liang 1999 cites Kaufman 1979 doi	Table 2, p. 4, row 4 report
αNb5Si3	Nb5Si3	-66.4 kJ/mol-atom	298.15	unspecified	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006	Table 7, p. 8, row 11 report
αNb5Si3	Nb5Si3	-65.379 kJ/mol-atom	298.15	experimental	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[7] Fernandes 2002 cites Nunes	Table 3, p. 6, row 5 report
αNb5Si3	Nb5Si3	-65.3 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006 cites Kaufman 1979 doi	Table 7, p. 8, row 3 report
αNb5Si3	Nb5Si3	-64.8 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006 cites Yang 2003 doi	Table 7, p. 8, row 9 report
αNb5Si3	Nb5Si3	-64.6 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006 cites Meschel 1998 doi	Table 7, p. 8, row 5 report
αNb5Si3	Nb5Si3	-64.6 kJ/mol-atom	298.15	experimental	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[7] Fernandes 2002 cites Meschel 1998 doi	Table 3, p. 6, row 3 report
αNb5Si3	Nb5Si3	-63.8 kJ/mol-atom	298.15	experimental	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006 cites Gorelkin 1972	Table 7, p. 8, row 1 report
αNb5Si3	Nb5Si3	-63.8 kJ/mol-atom	298.15	experimental	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[7] Fernandes 2002 cites Gorelkin 1972	Table 3, p. 6, row 4 report
αNb5Si3	Nb5Si3	-62.7 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006 cites Fernandes 2002 doi	Table 7, p. 8, row 7 report
αNb5Si3	Nb5Si3	-62.6575 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[7] Fernandes 2002	Table 3, p. 6, row 1 report
αNb5Si3	Nb5Si3	-60.9 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006 cites Fernandes 2002 doi	Table 7, p. 8, row 8 report
αNb5Si3	Nb5Si3	-60.9 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006 cites Shao 2004 doi	Table 7, p. 8, row 10 report
αNb5Si3	Nb5Si3	-60.8871 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[7] Fernandes 2002	Table 3, p. 6, row 2 report
αNb5Si3	Nb5Si3	-60.7 kJ/mol-atom	298.15	experimental	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006 cites Chart 1973	Table 7, p. 8, row 2 report
αNb5Si3	Nb5Si3	-56 kJ/mol-atom	298.15	unspecified	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006 cites Niessen 1981 doi	Table 7, p. 8, row 4 report
αNb5Si3	Nb5Si3	-56 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006 cites Shao 2004 doi	Table 7, p. 8, row 10 report
αNb5Si3	Nb5Si3	-52 kJ/mol-atom	298.15	model	-62.965 (mp-aaaaaugk)	-65.593 (oqmd-3572)	[2] David 2006 cites Liang 1999 doi	Table 7, p. 8, row 6 report

Other properties

Phase transition (28)

Phase transition, Nb–Si system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	2200 K	2200	L -> NbSi2 L: Si 0.667; NbSi2: Si 0.667	model	[2] David 2006 cites Liang 1999 doi	Table 6, p. 7, row 65 report
Phase transition	2200.15 K	2200.15	L -> NbSi2 L: Si 0.667; NbSi2: Si 0.667	model	[4] Liang 1999	Table 1, p. 2, row 13 report
Phase transition	2208 K	2208	L -> NbSi2 L: Si 0.667; NbSi2: Si 0.667	model	[2] David 2006 cites Schlesinger 1993 doi	Table 6, p. 7, row 64 report
Phase transition	2213 K	2213	L -> NbSi2 L: Si 0.667; NbSi2: Si 0.667	model	[2] David 2006 cites Okamoto 1990	Table 6, p. 7, row 63 report
Phase transition	2213.15 K	2213.15	L -> NbSi2 L: Si 0.667; NbSi2: Si 0.667	experimental	[4] Liang 1999 cites Kocherzhinskiy 1980	Table 1, p. 2, row 14 report
Phase transition	2213.15 K	2213.15	L->NbSi2 L: Si 0.667; NbSi2: Si 0.666667	experimental	[3] Yang 2003 cites Kocherzhinskiy 1980	Table 2, p. 2, row 22 report
Phase transition	2218 K	2218	L -> NbSi2 L: Si 0.667; NbSi2: Si 0.667	model	[2] David 2006	Table 6, p. 7, row 70 report
Phase transition	2218.15 K	2218.15	L -> (NbSi2) L: Si 0.667	model	[5] Geng 2009 cites David 2006 doi	Table 2, p. 3, row 18 report
Phase transition	2225 K	2225	L -> NbSi2 L: Si 0.667; NbSi2: Si 0.667	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 67 report
Phase transition	2229 K	2229	L -> NbSi2 L: Si 0.667; NbSi2: Si 0.667	model	[2] David 2006 cites Yang 2003 doi	Table 6, p. 7, row 68 report
Phase transition	2229.15 K	2229.15	L->NbSi2 L: Si 0.667; NbSi2: Si 0.666667	model	[3] Yang 2003	Table 2, p. 2, row 21 report
Phase transition	2230 K	2230	L -> NbSi2 L: Si 0.667; NbSi2: Si 0.667	model	[2] David 2006 cites Shao 2004 doi	Table 6, p. 7, row 69 report
Phase transition	2235.15 K	2235.15	L -> (NbSi2) L: Si 0.667	model	[5] Geng 2009	Table 2, p. 3, row 17 report
Phase transition	2236 K	2236	L -> NbSi2 L: Si 0.667; NbSi2: Si 0.667	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 66 report
Phase transition	2763 K	2763	L -> βNb5Si3 L: Si 0.375; βNb5Si3: Si 0.375	model	[2] David 2006 cites Liang 1999 doi	Table 6, p. 7, row 57 report
Phase transition	2763.15 K	2763.15	L -> Nb5Si3 L: Si 0.375; Nb5Si3: Si 0.375	model	[4] Liang 1999	Table 1, p. 2, row 11 report
Phase transition	2788 K	2788	L -> βNb5Si3 L: Si 0.375; βNb5Si3: Si 0.375	model	[2] David 2006 cites Schlesinger 1993 doi	Table 6, p. 7, row 56 report
Phase transition	2791 K	2791	L -> βNb5Si3 L: Si 0.375; βNb5Si3: Si 0.375	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 59 report
Phase transition	2793 K	2793	L -> βNb5Si3 L: Si 0.375; βNb5Si3: Si 0.375	model	[2] David 2006 cites Okamoto 1990	Table 6, p. 7, row 55 report
Phase transition	2793.15 K	2793.15	L -> Nb5Si3 L: Si 0.375; Nb5Si3: Si 0.375	experimental	[4] Liang 1999 cites Kocherzhinskiy 1980	Table 1, p. 2, row 12 report
Phase transition	2793.15 K	2793.15	L->βNb5Si3 L: Si 0.375; βNb5Si3: Si 0.375	experimental	[3] Yang 2003 cites Kocherzhinskiy 1980	Table 2, p. 2, row 20 report
Phase transition	2796 K	2796	L -> βNb5Si3 L: Si 0.375; βNb5Si3: Si 0.375	model	[2] David 2006 cites Yang 2003 doi	Table 6, p. 7, row 60 report
Phase transition	2796.15 K	2796.15	L->βNb5Si3 L: Si 0.375; βNb5Si3: Si 0.375	model	[3] Yang 2003	Table 2, p. 2, row 19 report
Phase transition	2797 K	2797	L -> βNb5Si3 L: Si 0.375; βNb5Si3: Si 0.375	model	[2] David 2006 cites Fernandes 2002 doi	Table 6, p. 7, row 58 report
Phase transition	2797 K	2797	L -> βNb5Si3 L: Si 0.375; βNb5Si3: Si 0.375	model	[2] David 2006	Table 6, p. 7, row 62 report
Phase transition	2797.15 K	2797.15	L -> β(Nb5Si3) L: Si 0.375	model	[5] Geng 2009 cites David 2006 doi	Table 2, p. 3, row 16 report
Phase transition	2799.15 K	2799.15	L -> β(Nb5Si3) L: Si 0.39	model	[5] Geng 2009	Table 2, p. 3, row 15 report
Phase transition	2806 K	2806	L -> βNb5Si3 L: Si 0.378; βNb5Si3: Si 0.378	model	[2] David 2006 cites Shao 2004 doi	Table 6, p. 7, row 61 report

Crystal structure (17)

Crystal structure, Nb–Si system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	10.23 Å	298.15	Nb3Si alloy: Si 0.25	model	[8] Li 2013 cites Daams 1991	Table 1, p. 2, row 4 report
Lattice a	10.224 Å	298.15	Nb3Si alloy: Nb 0.75, Si 0.25	model	[1] Shao 2004 cites Villars 1991	Table 1, p. 2, row 4 report
Lattice a	4.81 Å	298.15	NbSi2 alloy: Si 0.666667	model	[8] Li 2013 cites Daams 1991	Table 1, p. 2, row 7 report
Lattice a	4.81 Å	298.15	NbSi2 alloy: Nb 0.333333, Si 0.666667	model	[1] Shao 2004 cites Villars 1991	Table 1, p. 2, row 7 report
Lattice a	6.56 Å	298.15	αNb5Si3 alloy: Si 0.375	model	[8] Li 2013 cites Daams 1991	Table 1, p. 2, row 5 report
Lattice a	6.571 Å	298.15	αNb5Si3 alloy: Nb 0.625, Si 0.375	model	[1] Shao 2004 cites Villars 1991	Table 1, p. 2, row 6 report
Lattice a	10.03 Å	298.15	βNb5Si3 alloy: Si 0.375	model	[8] Li 2013 cites Daams 1991	Table 1, p. 2, row 6 report
Lattice a	10.04 Å	298.15	βNb5Si3 alloy: Nb 0.625, Si 0.375	model	[1] Shao 2004 cites Villars 1991	Table 1, p. 2, row 5 report
Lattice c	5.18 Å	298.15	Nb3Si alloy: Si 0.25	model	[8] Li 2013 cites Daams 1991	Table 1, p. 2, row 4 report
Lattice c	5.189 Å	298.15	Nb3Si alloy: Nb 0.75, Si 0.25	model	[1] Shao 2004 cites Villars 1991	Table 1, p. 2, row 4 report
Lattice c	6.61 Å	298.15	NbSi2 alloy: Si 0.666667	model	[8] Li 2013 cites Daams 1991	Table 1, p. 2, row 7 report
Lattice c	6.61 Å	298.15	NbSi2 alloy: Nb 0.333333, Si 0.666667	model	[1] Shao 2004 cites Villars 1991	Table 1, p. 2, row 7 report
Lattice c	11.86 Å	298.15	αNb5Si3 alloy: Si 0.375	model	[8] Li 2013 cites Daams 1991	Table 1, p. 2, row 5 report
Lattice c	11.889 Å	298.15	αNb5Si3 alloy: Nb 0.625, Si 0.375	model	[1] Shao 2004 cites Villars 1991	Table 1, p. 2, row 6 report
Lattice c	5.07 Å	298.15	βNb5Si3 alloy: Si 0.375	model	[8] Li 2013 cites Daams 1991	Table 1, p. 2, row 6 report
Lattice c	5.081 Å	298.15	βNb5Si3 alloy: Nb 0.625, Si 0.375	model	[1] Shao 2004 cites Villars 1991	Table 1, p. 2, row 5 report
lattice gamma	120 °	298.15	NbSi2 alloy: Nb 0.333333, Si 0.666667	model	[1] Shao 2004 cites Villars 1991	Table 1, p. 2, row 7 report

Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

G. Shao, Thermodynamic assessment of the Nb–Si–Al system, Intermetallics 12, 655-664 (2004). doi:10.1016/j.intermet.2004.03.011
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). doi:10.1016/j.intermet.2005.08.013
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). doi:10.1016/s0966-9795(03)00021-9
H. Liang, Y.A. Chang, Thermodynamic modeling of the Nb–Si–Ti ternary system, Intermetallics 7, 561-570 (1999). doi:10.1016/s0966-9795(98)00073-9
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). doi:10.1016/j.intermet.2008.11.011
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). doi:10.1016/j.jallcom.2017.04.279
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). doi:10.1016/s0966-9795(02)00125-5
Yan Li, Changrong Li, Zhenmin Du, Cuiping Guo, Thermodynamic optimization of the Nb–Si–W ternary system, Calphad 43, 112-123 (2013). doi:10.1016/j.calphad.2013.04.004

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735859
R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735891
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 the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); 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). 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_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@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}
}