Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20019
Title: Microstructure and electrical properties of La-modified K 0.5Na0.5NbO3 lead-free piezoelectric ceramics
Authors: Gao, D
Kwok, KW 
Lin, D
Chan, HLW 
Issue Date: 2009
Publisher: Institute of Physics Publishing
Source: Journal of physics. D, Applied physics, 2009, v. 42, no. 3, 035411 How to cite?
Journal: Journal of physics. D, Applied physics 
Abstract: Lead-free ceramics (K0.5Na0.5)1-3xLa xNbO3 (0 ≤ x ≤ 0.0175) have been fabricated by a conventional sintering technique. The results of XRD show that the ceramics possess a perovskite structure with orthorhombic symmetry. Moreover, doping inhibits the grain growth, decreases the ferroelectric-paraelectric phase transition temperature and induces a diffuse phase transition. At low doping levels (x ≤ 0.0075), the observed remanent polarization (Pr) and coercive field (Ec) remain almost unchanged. As x increases from 0.0075 to 0.0175, Pr starts to decrease while Ec increases. Nevertheless, due to the increase in relative permittivity, the ceramic with x = 0.0125 exhibits the optimum piezoelectric properties, giving a large piezoelectric coefficient (d33 = 135 pC N-1) and a high planar electromechanical coupling coefficient (kP = 0.40).
URI: http://hdl.handle.net/10397/20019
ISSN: 0022-3727
EISSN: 1361-6463
DOI: 10.1088/0022-3727/42/3/035411
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