STRUCTURE REFINEMENT OF MULLITE BY THE RIETVELD METHOD AND A NEW METHOD FOR ESTIMATION OF CHEMICAL-COMPOSITION

被引:131
作者
BAN, T
OKADA, K
机构
[1] Department of Inorganic Materials, Tokyo Institute of Technology, Tokyo
关键词
MULLITE; LATTICE; COMPOSITION; CRYSTALLOGRAPHY; X-RAY DIFFRACTION;
D O I
10.1111/j.1151-2916.1992.tb05473.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The structure of mullite was refined by the Rietveld method, and a new method for the estimation of chemical composition of mullite was proposed. Mullites were synthesized by firing the starting materials prepared by sol-gel and spray pyrolysis methods at various temperatures. Linear correlations were recognized between the chemical composition of mullite analyzed with the Rietveld method and the lengths of a and b axes, but a small anomaly was found in the variation of the c axis. It was found to be caused by a difference in the c axis of pseudotetragonal mullite and that of orthorhombic mullite. A good correlation was found between the chemical composition of mullite and the intensity ratio of (I220/I111). This is a much more convenient method for estimating the chemical composition of mullite than Cameron's method, which uses a lattice constant.
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页码:227 / 230
页数:4
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