Structural phase transitions to the state with anomalously high-ionic conductivity in some perroelectric and ferroelastic crystals of the bisulpate group

Abstract

Abstract The temperature dependences of the conductivity CsHSO4, CsHSeO4, RbHSO4, RbHSEO4, and NH4HSO4 have been measured and optical investigation was also made. It was found that the high temperature phase transitions in CsHSO4, CsHSeO4, and RbHSeO4 at 413, 400 and 446 K, respectively are the transitions to the superionic state with 6′7 10−30hm−1.cm−1. Some pecularities of these phase transitions are reported.