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Journal of Nanomaterials
Volume 2010, Article ID 783043, 8 pages
http://dx.doi.org/10.1155/2010/783043
Research Article

Nanocrystalline Pb(Zr0.52Ti0.48)O3 Ferroelectric Ceramics: Mechanical and Electrical Properties

1Nanotechnology Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Madras, Chennai 600 036, India
2Ceramic Composite Materials Laboratory, Department of Physics, Sri Krishnadevara University, Anantapur 515 003, India
3Microwave Laboratory, Department of Physics, Indian Institute of Technology, Chennai 600 036, India

Received 30 November 2009; Revised 24 February 2010; Accepted 22 March 2010

Academic Editor: Christian Brosseau

Copyright © 2010 M. Venkata Ramana 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 powders of the composition P b ( Z r 0 . 5 2 T i 0 . 4 8 ) O 3 were obtained by Mechanical alloying (high-energy ball milling). X-ray diffraction studies show that these compounds are completely into the perovskite phase. Detailed studies of electrical and mechanical properties of PZT as a function of temperature (and frequency) showed the high permittivity of 20653 at Curie transition temperature. Temperature variation of longitudinal modulus and internal friction of these ceramics at 104 kHz frequency were studied in the wide temperature range of 3 0 C– 4 2 0 C. The internal friction measurements showed sharp stress induced relaxation peaks in the present composition corresponding to those temperatures where the minima were noticed in temperature variation of longitudinal modulus behavior. This dielectric and internal friction behaviour was explained in the light of polaron hopping mechanism and structural phase transitions in the present piezoelectric compositions.