Electrical characterisation of Pb 2 Bi 3 SmTi 5 O 18 ceramic using impedance spectroscopy

Abstract

Polycrystalline sample of Pb₂Bi₃SmTi₅O₁₈, a member of tungsten–bronze (TB) family, was prepared using a high temperature solid state reaction technique. X-ray diffraction (XRD) analysis indicated the formation of a single phase orthorhombic structure. AC impedance plots were used as a tool to analyse the electrical behaviour of the sample as a function of frequency at different temperatures. The ac impedance studies revealed the presence of grain boundary effect, from 350°C onward. Complex impedance analysis indicated non-Debye type dielectric relaxation. The Nyquist plot showed the negative temperature coefficient of resistance (NTCR) character of Pb₂Bi₃SmTi₅O₁₈. AC conductivity data were used to evaluate the density of states at Fermi level and activation energy of the compound.

Keywords

PB2BI3SMTI5O18 IMPEDANCE SPECTROSCOPY DIELECTRIC RELAXATION CONDUCTIVITY

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