Table of Contents
ISRN Materials Science
Volume 2011, Article ID 808560, 6 pages
http://dx.doi.org/10.5402/2011/808560
Research Article

Effect of γ-Irradiation on the Dielectric and Conductivity Properties of Nano-Wollastonite

1Department of Physics, Bangalore University, Bangalore 560 056, India
2Department of Chemistry, MS Ramaiah Institute of Technology, Bangalore 560 054, India
3Department of Physics, APS College of Engineering, Bangalore 560 082, India
4Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India

Received 23 April 2011; Accepted 18 May 2011

Academic Editor: Y. C. Lu

Copyright © 2011 Sandhya Kulkarni 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

Nanocrystalline porous CaSiO3 ceramic powders have been synthesized by a novel low-temperature initiated self-propagating, gas-producing solution combustion method. Single phase β-CaSiO3 (Wollastonite) is formed by calcination at 900°C for 3 h. The crystallization and phase formation temperatures in this method are found to be lower compared to the powder obtained via solid state reaction method. The powder is characterized by powder XRD (X-Ray Diffraction), and crystallite sizes are evaluated using Scherrer's formula as well as from TEM (Transmission Electron Microscopy). The Wollastonite powder is exposed to 60Co γ-radiation to accumulated doses of 1, 3, and 5 KGy and low-frequency (102–106 Hz) dielectric measurements are carried out before and after irradiation. The dielectric conductivity is estimated from the dielectric constant and loss tangent. Exposure to γ-radiation results in substantial modification in the properties of the ceramic powder due to changes in the porosity of the material. The correlation between dielectric and conductivity properties is discussed in relation to porosity effect.