Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17833
Title: Ferroelectric and piezoelectric properties of Bi0.5(Na 0.925-x-yLi0.075KxAgy) 0.5TiO3 lead-free ceramics
Authors: Lin, D
Kwok, KW 
Chan, HLW 
Issue Date: 2007
Publisher: Institute of Physics Publishing
Source: Journal of physics. D, Applied physics, 2007, v. 40, no. 23, p. 7523-7529 How to cite?
Journal: Journal of physics. D, Applied physics 
Abstract: Lead-free ceramics Bi0.5(Na0.925-x-yLi 0.075KxAgy)0.5TiO3 have been prepared by an ordinary sintering technique, and their ferroelectric and piezoelectric properties have been studied. From the results of x-ray diffraction, Li+, K+ and Ag+ diffuse into the Bi0.5Na0.5TiO3 lattices to form a solid solution with a pure perovskite structure, and a morphotropic phase boundary (MPB) exists at 0.15 < x < 0.25. Compared with pure Bi 0.5Na0.5TiO3, the substitutions of K + and Ag+ lower the coercive field Ec greatly and increase the remanent polarization Pr of the ceramics. Because of the MPB and low Ec, the piezoelectricity is significantly enhanced. For the ceramics with compositions near the MPB, the piezoelectric coefficient d33 = 178-219 pC N-1, the planar electromechanical coupling factors kP = 35-39% and kt = 44-51%. Also, the depolarization temperature Td reaches a minimum value near the MPB. The results of the ferroelectric and dielectric properties at high temperatures suggest that the ceramics may contain both the polar and non-polar regions at temperatures above Td.
URI: http://hdl.handle.net/10397/17833
ISSN: 0022-3727
EISSN: 1361-6463
DOI: 10.1088/0022-3727/40/23/042
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