CHARACTERIZATION OF LiPb2V5O15 CERAMICS USING IMPEDANCE SPECTROSCOPY

Abstract

The polycrystalline sample of LiPb 2 V 5 O 15 was prepared by a mixed oxide method at low temperature (i.e. 550°C). Preliminary structural analysis confirmed the formation of the compound of an orthorhombic crystal system. The impedance parameters of the material were studied using complex impedance spectroscopy (CIS) in a wide temperature (i.e. 30–450°C) and frequency (i.e. 102–106 Hz) range. From the complex impedance plots, grain/grain boundary effects and relaxation phenomenon were observed above 30°C. Study of electrical conductivity suggests that the compound exhibits the negative temperature coefficient of resistance (NTCR) behavior like a semiconductor.