Transactions of the INDIAN CERAMIC SOCIETY Vol. 33 1974
Kinetics of Quartz Transformation
SANMOY MITRA
Pages : 25-32
DOI : 10.1080/0371750X.1974.10840834
Abstract
The transformations of two varieties of high purity quartz were studied at 1400
and 1500°, the determination of quartz being done by DT A. The transformations were
found to be greatly influenced by particle size. The decomposition of fine fractions of
quartz followed a spherical model in which the decomposition starting from the surface
nucleation centres proceeded towards the interior of the particles. Decomposition of
coarse fractions did not accurately follow this model, and their apparent decomposition
velocities were much higher than those for the fine fractions, an explanation to which
has been sought in a consideration of additional decomposition from interior nucleation
centres in the coarse particles. No induction period was observed for the decomposition
of any size fraction. The small difference in the transformation rates between the two
varieties of quartz was attributed to presence of strain or possible structural defects in
one ofthem.
