Abstract
AbstractAn X‐ray powder diffractometer has been equipped with a heatable sample holder which allows highly defined heating up to 250°C. A good temperature control permits isothermal as well as non‐isothermal runs. The applicability of time‐ and temperature‐resolved X‐ray powder diffractometry (TXRD) as a thermoanalytical method is demonstrated. Solid state reactions and solid‐solid phase transformations were investigated. As examples the phase transformation of phenanthrene and the dehydration of caffeine hydrate are presented. It is possible to extract the activation parameters for a solid state reaction from a single non‐isothermal run with a constant heating rate. The principles of the quantitative kinetic evaluation of time‐ and temperature‐resolved X‐ray powder diffraction data are outlined.
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