Abstract
The rates of solid-solid phase transitions have been measured by nonspectroscopic techniques, such as differential thermal analysis (DTA), dilatometry, and x-ray powder diffraction. With DTA, the accuracy of the activation energy is rarely better than ±15% in part because good thermal contact between the sample and, the pan is difficult to maintain. Dilatometry measures the volume change accompanying a thermodynamic first order phase transition. Crystal decomposition and out-gassing of trapped solvent molecules complicate the method. High temperature x-ray powder diffraction is restricted to relatively slow phase transformations. If the solid phase transition is quenched and the intensity of a characteristic peak measured, errors can be incurred in determining the concentration. Internal standards may alleviate this problem, but sample homogeneity becomes an issue.
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