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Research Letters in Materials Science
Volume 2007, Article ID 91796, 5 pages
http://dx.doi.org/10.1155/2007/91796
Research Letter

Ferroelectric Properties of Na2Pb2R2W2Ti4V4O30(R = Dy, Pr) Ceramics

Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721302, India

Received 19 July 2007; Accepted 12 October 2007

Academic Editor: Chun-Hway Hsueh

Copyright © 2007 Piyush R. Das 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 polycrystalline samples of Na2Pb2R2W2Ti4V4O30 (R = Dy, Pr) were prepared by low-temperature, (i.e., at 650C) solid-state reaction technique. The preparation conditions have been optimized using thermogravimetry analysis (TGA) technique. X-ray diffraction (XRD) studies of the compounds showed the formation of a single-phase orthorhombic crystal structure at room temperature. Studies of dielectric properties (ɛr and tan δ) of the compounds at frequencies 10, 100, and 1000 kHz in a wide temperature range (room temperature–500C) exhibit ferroelectric phase transitions at 132C for NPDWTV and at 122C for NPPWTV of diffuse type. Ferroelectric properties of the materials are confirmed by polarization study.