Table of Contents
Journal of Ceramics
Volume 2013 (2013), Article ID 261914, 6 pages
http://dx.doi.org/10.1155/2013/261914
Research Article

Effect of Processing on Synthesis and Dielectric Behavior of Bismuth Sodium Titanate Ceramics

1Department of Physics and Material Science & Engineering, Jaypee Institute of Information Technology, Noida 201307, India
2Electroceramics Group, Solid State Physics Laboratory, Defence Research and Development Organization (DRDO), Timarpur, Delhi 110054, India

Received 29 June 2012; Accepted 20 November 2012

Academic Editor: Baolin Wang

Copyright © 2013 Vijayeta Pal et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An effort has been made to synthesize polycrystalline (abbreviated as BLNT) system with compositions x = 0, 0.02, and 0.04 by novel semiwet technique. Preparation of A-site oxides of BLNT for composition x = 0 was optimized using two precursor solutions such as ethylene glycol and citric acid. The XRD patterns revealed that the sample prepared by ethylene glycol precursor solution has single phase perovskite structure with a rhombohedral symmetry at RT as compared to the sample prepared by citric acid. Ethylene glycol precursor has been found to play a significant role in the crystallization, phase transitions, and electrical properties. The studies on structure, phase transitions, and dielectric properties for all the samples have been carried out over the temperature range from RT to 450°C at 100 kHz frequency. It has been observed that two phase transitions (i) ferroelectric to antiferroelectric and (ii) antiferroelectric to paraelectric occur in all the samples. All samples exhibit a modified Curie-Weiss law above Tc. A linear fitting of the modified Curie-Weiss law to the experimental data shows diffuse-type transition. The dielectric as well as ferroelectric properties of BLNT ceramics have been found to be improved with the substitution of La elements.