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Barium titanate; impedance; grain/grain boundary resistance and capacitance; grain/grain boundary relaxation frequency; electrical conductivity; hopping mechanism.

Electrical conduction studies on Ba(Nd_0.2Ti_0.6Nb_0.2)O₃ ceramic samples prepared through conventional and microwave sintering route are presented in this paper. D.C. and a.c. conductivities of these samples as a function of temperature from 300–900 K have been studied. Two types of conduction processes are evident from the frequency dependant conductivity plots, i.e. low-frequency conduction due to short-range hopping and high-frequency conduction due to the localized relaxation (reorientational) hopping mechanism. Grain and grain boundary contributions to the conductivity in these samples are obtained from impedance/admittance measurements via equivalent circuit modelling.

Syed Mahboob¹ G Prasad¹ G S Kumar¹

1. Department of Physics, Osmania University, Hyderabad 500 007, India

Published

August 2006

Manuscript received

7 October 2005

Manuscript revised

9 May 2006