The effect of hydrostatic pressure up to 2 GPa on the phase transitions has been studied in the superprotonic conductor Rb3H(SeO4)2. Among the important results of these investigations are the large decrease in the superprotonic phase transition temperature Tsi with pressure (dTsi/dP = -47 ± 7 GPa/K) and the inducing of new phase IV by the hydrostatic pressure P ≥ 1.22 GPa. The thermo-dynamical relationship between phases III, III', II, IV as well as the possibility of the existing of tetracritical point at P = 1.22 ± 0.02 GPa and T = 390 ± 2 K are discussed.
Ferroelectrics
Volume 167, 1995 - Issue 1
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Related Research Data
Crystals with disordered hydrogen-bond networks and superprotonic conductivity. Review
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