Study of electrical properties of Pb(Yb0.5Ta0.5)O3 by impedance spectroscopy

Abstract

The electrical properties of Pb(Yb0.5Ta0.5)O3 perovskite were studied over a wide temperature and frequency range by complex impedance spectroscopy. At low temperature, only the grain contribution, whereas at high temperature, both the grain and grain boundary contributions to the electrical properties was predominately observed. The temperature-dependent bulk dc conductivity confirmed the negative temperature coefficient of resistance behavior. The activation energy in studied temperature range was evaluated by fitting the temperature-dependent dc conductivity data to the Arrhenius relation. The frequency-dependent electrical data were analyzed in the framework of conductivity formalism. The real part of the frequency-dependent ac conductivity plot obeyed Jonscher's power law; exhibiting a plateau and a dispersive region at low and high frequencies respectively.