AC electrical properties of the mixed crystal (NH4)3H(SO4)1.42(SeO4)0.58 Original Research Article

The frequency dependence of the AC conductivity of (NH4)3H(SO4)1.42(SeO4)0.58 (NHSSe) has been presented in the temperature range (299–393 K). The conductivity data has been analysed in terms of two theoretical models: hopping over a potential barrier model and quantum-tunnelling model. Values of the exponent s, decrease from 1.08 to 0.91 with increasing temperature and the experimental data revel that the hopping model is the rate determining mechanism.