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Physics Research International
Volume 2011 (2011), Article ID 395182, 5 pages
http://dx.doi.org/10.1155/2011/395182
Research Article

Sintering and Characterization of (Li, Sb, Ta)-Modified (Na, K)NbO3 Lead-Free Ceramics

1College of Physics Science and Technology, China University of Petroleum, Dongying 257061, China
2College of Material Science and Engineering, Liaocheng University, Liaocheng 252059, China

Received 28 April 2011; Accepted 7 July 2011

Academic Editor: Sergey B Mirov

Copyright © 2011 Peng Qi 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

Lead-free alkaline niobate-based piezoceramics, (Na0.52K0.435Li0.045)Nb0.87Sb0.08Ta0.05O3 (abbreviated KNLNT-S8), were prepared by conventional solid-state sintering method. The effects of sintering temperature on microstructure and piezoelectric properties of the (Li, Sb, Ta)-modified (Na, K) NbO3 were investigated. Microstructure of the samples sintered at different temperatures was observed by scanning electron microscopy (SEM) and optical microscopy. The KNLNT-S8 sample sintered at 1100°C possessed highest piezoelectric constant d33 and high-field piezoelectric strain coefficient d33* of 332 pC/N and 530 pm/V, respectively, with electromechanical coupling factors kp of 0.52 and kt of 0.48.