Abstract
Abstract At high temperature many compounds containing isolated tetrahedra show transitions to a state with a strong orientational disorder. At the same time, a large translational disorder associated with superionic conductivity can occur. For MHSO4 acid sulphates the large size and the weak charge of ions facilitate the disorder. A partial substitution of Cs+ by Li+, K+ or Rb+ spreads out the ionic/superionic conductor transition bringing together the properties of the high and low-temperature phases. Melting-annealing cycles of mixed compound lead to a state exhibiting a DSC trace of a glassy material. Attempts were made to understand the nature of the disorder and the relationship to the electrical properties using calorimetry, X-Ray diffraction, vibrational spectroscopy and impedance spectroscopy.
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