DETECTION AND STUDY OF STRUCTURAL PHASE-TRANSFORMATIONS IN CESIUM AMIDOSULFONATE

Three new structural phase transformations in the Cs amidosulfonate we re detected and studied by means of DSC, X-ray diffraction. infrared s pectroscopy and by measuring the temperature dependence of the dielect ric constant of monocrystalline platelets. In the temperature range fr om 325 to 345 K a second-order phase transition occurs. After completi on of the second order-phase transformational a first-order phase tran sformation proceeds. At higher temperatures (435 K) a lambda-transitio n occurs. The transition temperatures, enthalpies and entropies of the above reactions as well the melting temperature and the heat of melti ng of the CsSO3NH2 were obtained. By means of the methods of H. KISSIN GER and T. OZAWA the activation energies of the first order phase tran sformation were determined.