DIELECTRIC AND IMPEDANCE CHARACTERISTICS OF K3LI2NB5O15 CRYSTAL AND CERAMICS

The dielectric and impedance characteristics of potassium lithium niob ate crystal, K(3)Li(2)Nb5O(15) (KLN), have been investigated over the frequency range of 100 Hz to 1 MHz in the temperature region from room temperature to 600 degrees C. The dielectric constant shows a marked anomaly at the transition temperature of 430 degrees C and slightly di ffuse phase transition. Ac complex impedance is explained by a Cole-Co le semi-circle expression at below and above the phase transition temp erature. But near the phase transition temperature, skewed semi-circle has been found. The dielectric properties and electrical conduction n ear the transition temperature are discussed with dielectric constant, conductivity and complex impedance.