Cover Page April-2012-Advanced Materials Letters

Advanced Materials Letters

Volume 3, Issue 2, Pages 143-148, April 2012
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A Study Of Structural, Dielectric And Electrical properties of Ba(Nd0.5Nb0.5)O3 Ceramics

Pritam Kumar, B. P. Singh, T. P. Sinha, N. K. Singh

Adv. Mater. Lett., 2012, 3 (2), pp 143-148

DOI: 10.5185/amlett.2011.8298

Publication Date (Web): Apr 14, 2012

Abstract

Dielectric spectroscopy is applied to investigate the electrical properties of a barium neodymium niobate, Ba(Nd0.5Nb0.5)O3 (BNN) in a temperature range from 323 K to 453 K and in the frequency range from 50 Hz to 1 MHz. The X-ray diffraction of the sample at room temperature shows a tetragonal phase. The scanning electron micrograph of the sample shows the average grain size of BNN ~ 1.92 mm. An analysis of the dielectric constant (e ¢) and loss tangent (tand) with frequency is performed assuming a distribution of relaxation times. The low frequency dielectric dispersion corresponds to DC conductivity. The logarithmic angular frequency dependence of loss peak is found to obey an Arrhenius law with activation energy of 0.55 eV. The frequency dependence of electrical data is also analyzed in the framework of conductivity and electric modulus formalisms. Both these formalisms show qualitative similarities in relaxation times. The scaling behavior of tangent loss (tanδ) suggests that the distribution of relaxation times is temperature independent in BNN. 

Keywords

Perovskite oxides, dielectrics, electrical properties, X-ray diffraction, scanning electron micrographs

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