Electrical properties of the double perovskite oxide Ho2CuZrO6

The double perovskite oxide holmium copper zirconate, Ho2CuZrO6 (HCZ), was synthesized by a solid-state reaction technique. The crystal structure of HCZ shows a monoclinic phase. The dielectric relaxation of HCZ was investigated in the frequency range 44 Hz-1 MHz and in the temperature range 40-360 0C by using impedance spectroscopy. The complex impedance data were analysed by the Cole-Cole model. The ac conductivity follows the power law. The value of activation energy obtained from the temperature dependence of the dc conductivity plot indicates a hopping-type conduction mechanism. The scaling behaviour of the imaginary part of impedance indicates that relaxation in HCZ describes the same mechanism at various temperatures.