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Quantitative Phase‐Composition Analysis of Liquid‐Phase‐Sintered Silicon Carbide Using the Rietveld Method
Author(s) -
Ortiz Angel L.,
Cumbrera Francisco L.,
SánchezBajo Florentino,
Guiberteau Fernando,
Xu Huiwen,
Padture Nitin P.
Publication year - 2000
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.1151-2916.2000.tb01548.x
Subject(s) - rietveld refinement , texture (cosmology) , silicon carbide , materials science , phase (matter) , yttrium , powder diffraction , diffraction , analytical chemistry (journal) , crystallography , optics , chemistry , composite material , computer science , physics , chromatography , metallurgy , artificial intelligence , organic chemistry , image (mathematics) , oxide
Accurate quantitative X‐ray diffraction analysis of SiC‐based ceramics is difficult because of the significant overlap of the Bragg reflections from the different SiC polytypes. In this regard, the Rietveld method is a powerful tool for the accurate and precise analysis of the phase/polytype compositions in these materials. In this study, we have used two different types of Rietveld codes for the quantitative phase/polytype analysis of a liquid‐phase‐sintered SiC specimen: FULLPROF, which is based on the classical Rietveld approach, and BGMN, which is based on the new fundamental parameter approach. In both cases, the effect of texture corrections on the precision of the analysis also was studied. The accuracy of the analysis, in terms of the weight percentage of SiC (all polytypes) and yttrium aluminum garnet liquid phase, as determined from the starting powder composition, is within the standard deviation of the analysis in both cases (FULLPROF and BGMN), with and without the texture corrections. In addition, in the case of the classical code (FULLPROF), inclusion of the texture corrections has been shown to improve the precision. In contrast, the precision of the analysis using the BGMN code without the texture corrections is better. However, inclusion of the texture corrections is expected to improve the accuracy of the analysis.