Abstract
A new double perovskite oxide holmium cadmium zirconate Ho2CdZrO6 (HCZ) is synthesized by solid state reaction technique. The crystal structure has been determined by powder X-ray diffraction (XRD) which shows monoclinic phase at room temperature. The frequency dependent electrical data are analyzed in the framework of conductivity and electric modulus formalisms. The scaling behavior of imaginary electric modulus suggests that the relaxation describe the same mechanism at various temperatures. Nyquist plots are drawn to identify an equivalent circuit and to know the bulk and interface contributions. The conduction mechanism is explained by Mott’s theory. At the high temperature range, conductivity data satisfy the variable range hopping (VRH) model. In this regime, the conductivity of sample obeys Mott’s T 1/4 law indicating 3D charge transport in HCZ compound. High temperature data indicates the formation of thermally activated small polarons.
Highlights
Double perovskites, with general formula A2B′B′′O6, are one of the most widely studied families of oxides owing greatly to their synthetic variability, compositional flexibility andA
The calcined sample was palletized into a circular disc using PVA as binder which was burnt out during high temperature sintering at 1150 °C for 6 h, and cooled slowly to room temperature at a cooling rate 1 °C/min
Good agreement between the observed and calculated interplanner spacing (d-values), Table 1, suggests that the compound crystallizes in monoclinic phase at room temperature
Summary
With general formula A2B′B′′O6, are one of the most widely studied families of oxides owing greatly to their synthetic variability, compositional flexibility and. The basic promise of rare earth oxides in electronics is that of enabling high temperature and high-power devices. These oxides have high resistivity, high dielectric constant, large band gap, high recrystallization temperature and thermodynamically stable in contact with Si substrate at high temperature (~800 °C) under high vacuum [10]. Though the electrical properties of various double perovskites have been studied in the recent past [11,12,13,14,15], no. Report the preparation and electrical properties of a new double perovskite oxide Ho2CdZrO6 in a frequency range (100 Hz–1 MHz) at various temperatures
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