Abstract
Complex impedance and dielectric constants of ferroelectric crystals Li0.4K0.6NbO3 have been studied in the frequency domain at several temperatures. A strong low-frequency dielectric dispersion below 1 kHz was revealed in the high temperature range. The normalized behaviour of the complex dielectric constants satisfies the universal dynamic response with its power exponent n=0.04. In the high frequency region, the complex impedance was described by a modified Cole-Cole arc. An equivalent circuit for the transport process of high frequency region has been examined. The temperature-dependent exponent has its minimum at the ferro- to para-electric phase transition point and relaxation frequencies do not satisfy the Arrhenius law in the ferroelectric region
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