Abstract

The heat capacity and the bulk conductivity have been measured in the K9H7(SO4)8 · H2O crystal. The hysteresis phenomena have been studied upon superprotonic phase transition. It is revealed that the phase transition is reversible upon thermocycling only for the monohydrate form of the crystal. The exponential temperature dependence of the heat capacity in the supercooled disordered phase exhibits a thermally activated behavior and is determined by the defects responsible for the high conductivity of the crystal.

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