Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4232
Title: Structure and electrical properties of K₀.₅Na₀.₅NbO₃-LiSbO₃lead-free piezoelectric ceramics
Authors: Lin, D
Kwok, KW 
Lam, KH
Chan, HLW 
Keywords: Potassium compounds
Sodium compounds
Lithium compounds
Piezoceramics
Sintering
X-ray diffraction
Ferroelectric transitions
Piezoelectricity
Dielectric polarisation
Ferroelectric Curie temperature
Issue Date: 1-Apr-2007
Publisher: American Institute of Physics
Source: Journal of applied physics, 1 Apr. 2007, v. 101, no. 7, 074111, p. 1-6 How to cite?
Journal: Journal of applied physics 
Abstract: Lead-free piezoelectric ceramics (1−x)K₀.₅Na ₀.₅NbO₃-xLiSbO₃have been fabricated by a conventional ceramic sintering technique. The results of x-ray diffraction suggest that Liᐩ and Sb⁵ᐩ diffuse into the K₀.₅Na₀.₅NbO₃lattices to form a solid solution with a perovskite structure. The ceramics can be well sintered at 1070–1110 ℃ . The introduction of LiSbO₃into the Na₀.₅K₀.₅NbO₃solid solution decreases slightly the paraelectric cubic-ferroelectric tetragonal phase transition temperature (Tᴄ) , but greatly shifts the ferroelectric tetragonal-ferroelectric orthorhombic phase transition (T[sub O–F]) to room temperature. Coexistence of the orthorhombic and tetragonal phases is formed at 0.05< x <0.07 at room temperature, leading to a significant enhancement of the piezoelectric properties. For the ceramic with x=0.06, the piezoelectric properties become optimum: piezoelectric constant d₃₃=212 pC/N, planar and thickness electromechanical coupling factors kP =46% and kt=47%, respectively, remanent polarization Pᵣ=15.0 μC/cm², coercive field Ec=1.74 kV/mm, and Curie temperature Tᴄ=358 °C.
URI: http://hdl.handle.net/10397/4232
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.2715486
Rights: © 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in D. Lin et al., J. Appl. Phys. 101, 074111 (2007) and may be found at http://link.aip.org/link/?jap/101/074111.
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