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Advances in Condensed Matter Physics
Volume 2014, Article ID 639259, 12 pages
http://dx.doi.org/10.1155/2014/639259
Research Article

Dielectric Studies on Fe3O4 Nanodoped - -Alkyloxybenzoic Acids

1Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar 522510, India
2Department of Physics, Gitam University, Hyderabad Campus, Rudraram 502329, India
3Department of Physics, Indian Institute of Technology, Chennai 600036, India
4Department of Electronics and Communication Engineering, K.L. University, Greenfields, Vaddeswaram, Guntur, Andhra Pradesh 522002, India
5Departmant of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia

Received 20 January 2014; Accepted 16 May 2014; Published 16 June 2014

Academic Editor: Victor V. Moshchalkov

Copyright © 2014 S. Sreehari Sastry 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

The stability of phase transition temperatures and textural changes for thermotropic pure and nanodoped - -alkyloxybenzoic acid mesogens were aimed to study at considerable time periods. Frequency and temperature dependent dielectric constant and dielectric loss for the pure and nanodoped liquid crystals were carried out. Significant anomalies in dielectric studies were observed near phase transitions when dielectric constant and dielectric loss had been measured as a function of temperature and frequency. Changes in dielectric constant and loss were observed and there were no apparent changes at high frequencies instead maintaining constant values. The variations in conductivity, activation energy, and relaxation times had also been studied in the nematic and smectic phases. The temperature dependent dielectric constant stability (temperature coefficient of dielectric constant ) had shown shift in the observed frequency range of thermotropic liquid crystals corresponding to the change in the dielectric constant values.