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In Situ Neutron Powder Diffraction Study of Ti 3 SiC 2 Synthesis
Author(s) -
Wu Erdong,
Kisi Erich H.,
Kennedy Shane J.,
Studer Andrew J.
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb01003.x
Subject(s) - materials science , disproportionation , neutron diffraction , sintering , decomposition , argon , in situ , diffraction , titanium , analytical chemistry (journal) , x ray crystallography , diffusion , pressureless sintering , crystallography , stoichiometry , metallurgy , crystal structure , chemistry , biochemistry , physics , organic chemistry , chromatography , optics , thermodynamics , catalysis
The synthesis of Ti 3 SiC 2 by pressureless reactive sintering of Ti/SiC/C mixtures under an Ar atmosphere has been studied using in situ neutron diffraction. The intermediate phases TiC x and Ti 5 Si 3 C x ( x ≤ 1) form first at ∼800–1400°C. These phases are consumed in the formation of Ti 3 SiC 2 , at ∼1500°C. After sintering, Ti 5 Si 3 C x disappears but an amount of TiC x remains in the sample primarily as a surface layer. The studies appear to support a suggestion that the intermediate phases react to form Ti 3 SiC 2 through a diffusion‐controlled process. Prolonged stepwise heating under argon in some experiments resulted in decomposition of Ti 3 SiC 2 above ∼1400°C and significant disproportionation of the sample.