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X‐Ray Study of Quartz‐Cristobalite Transformation
Author(s) -
CHAKLADER A. C. D.
Publication year - 1963
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.1151-2916.1963.tb11677.x
Subject(s) - cristobalite , quartz , grinding , transformation (genetics) , materials science , phase (matter) , mineralogy , catalysis , chemical engineering , crystallography , chemistry , metallurgy , organic chemistry , biochemistry , engineering , gene
The transformation of quartz at 1560°C was investigated by X‐ray techniques. The effect of particle size (and grinding) on the integrated peak intensities of the quartz powders was evaluated. The formation of a so‐called nonquartz layer of preferably nonquartz phase on quartz crystals was encountered after 5 hours of grinding. The present investigation substantiated the previous finding that the process of the transformation of quartz to cristobalite is a consecutive reaction involving an intermediate transition phase. Uranium dioxide of 0.64 wt% catalyzed the transformation reaction; it appeared, however, that this catalytic effect was more pronounced in the last stage (i.e. B → C) of the reaction sequence A → B → C.