| Dehydration transformation in an oxyhydroxide of iron, i.e. goethite
has been studied from X-ray line profile. The transformation of poorly
crystalline goethite into a well crystallized hematite has been explained
in terms of size defect which is inherent in all real crystals. Va.-iation
of particle size during the transformation has been calculated by
adopting quantitative X-ray methods based on integral breadth and
variance. The results of the measurements ate compared and used to
explain that with dehydration, the size defect gradually diminishes,
leading finally to the formation of defect free, well-crystallized
hematite. |
