Cover Page September-2012, Current Issue-Advanced Materials Letters

Advanced Materials Letters

Volume 3, Issue 4, Pages 315-320, September 2012, Current Issue
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Structural And Impedance Spectroscopy Analysis Of Ba(Fe0.5Nb0.5)O3-BaTiO3 ceramic System 

N. K. Singh1, Pritam Kumar1, Radheshyam Rai2,*, Andrei L. Kholkin2

1University Department of Physics, V. K. S. University, Ara 802301 Bihar, India

2Department of ceramics and glass engineering and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal

Adv. Mater. Lett., 2012, Current Issue, 3 (4), pp 315-320

DOI: 10.5185/amlett.2012.5345

Publication Date (Web): Jul 22, 2012

E-mail: radheshyamrai@ua.pt

Abstract

Polycrystalline samples of BaFe0.5Nb0.5O3 and (1-x)Ba(Fe0.5Nb0.5)O3-xBaTiO3, [referred as BFN and BFN-BT respectively] (x = 0.00, 0.15 and 0.20) have been synthesized by a high-temperature solid-state reaction technique. The formation of the compound was checked by an X-ray diffraction (XRD) technique. The microstructure analysis was done by scanning electron micrograph. The spectroscopic data presented in impedance plane show the grain and grain boundary contributions towards electrical processes in the form of semi-circular arcs. Detailed studies of dielectric and impedance properties of the materials in a wide range of frequency (100Hz–5MHz) and temperatures (30-282°C) showed that these properties are strongly temperature and frequency dependent.

Keywords

Dielectric properties, electrical properties, X-ray diffraction, scanning electron micrographs.

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