Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31911
Title: Phase structures and electrical properties of K0.5Na 0.5(Nb0.925Ta0.075)O 3-LiSbO 3 lead-free piezoelectric 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. 19, 044, p. 6060-6065 How to cite?
Journal: Journal of physics. D, Applied physics 
Abstract: Lead-free ceramics (1-x)K0.5Na0.5(Nb 0.925Ta0.075)O3-xLiSbO3 have been prepared by an ordinary sintering technique. Our results reveal that Li + and Sb5+ diffuse into the K0.5Na 0.5(Nb0.925Ta0.075)O 3 lattices to form a solid solution with a perovskite structure. The introduction of LiSbO3 into K0.5Na0.5(Nb0.925Ta 0.075)O 3 decreases the Curie temperature (Tc) slightly, but shifts the ferroelectric tetragonal-ferroelectric orthorhombic phase transition temperature (TO-T) significantly to low temperatures. As a result, the ceramics have an orthorhombic phase at x ≤ 0.02 and tetragonal phase at x ≥ 0.04. Coexistence of the orthorhombic and tetragonal phases is formed at 0.02 < x < 0.04 near room temperature, leading to significant enhancements of the piezoelectric properties. For the ceramic with x ≤ 0.035, the piezoelectric properties become optimum giving: piezoelectric coefficient d33 ≤ 244 pC N-1, electromechanical coupling factors kP ≤ 51% and kt ≤ 46%, remanent polarization Pr≤ 20.1 νC cm-2, coercive field Ec ≤ 1.37 kV mm-1 and Curie temperature Tc ≤ 354 °C. The ceramic has good temporal and thermal stability, greatly improved electrical properties and a relatively high Curie temperature, suggesting that it is a promising lead-free replacement for lead-based piezoelectric ceramics.
URI: http://hdl.handle.net/10397/31911
ISSN: 0022-3727
EISSN: 1361-6463
DOI: 10.1088/0022-3727/40/19/044
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