Design and Performance of a High‐Temperature X‐Ray Diffractometer Furnace

Abstract
A high‐temperature X‐ray diffractometer furnace that can be operated for extended periods at 2700°F in air has been constructed. The furnace has been operated successfully for shorter periods to 2800°F in air. Construction details are presented. This research tool has been used to follow the polymorphic inversions of silica from quartz in various high‐purity silica materials. The rate of inversion from quartz to cristobalite and tridymite has been found to be a function of crystallite size rather than of particle size.

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