Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22466
Title: Structure, piezoelectric and ferroelectric properties of Li- and Sb-modified K0.5Na0.5NbO3 lead-free ceramics
Authors: Lin, D
Kwok, KW 
Lam, KH
Chan, HLW 
Issue Date: 2007
Publisher: Institute of Physics Publishing
Source: Journal of physics. D, Applied physics, 2007, v. 40, no. 11, 036, p. 3500-3505 How to cite?
Journal: Journal of physics. D, Applied physics 
Abstract: Lead-free ceramics (K0.5Na0.5)1-xLi x(Nb1-ySby)O3 have been prepared by an ordinary sintering technique. Li+ and Sb5+ diffuse into the K0.5Na0.5NbO3 lattices to form a solid solution with the perovskite structure. The substitution of Li+ increases the Curie temperature Tc and shifts the ferroelectric tetragonal-ferroelectric orthorhombic phase transition (TO-T) to low temperatures. On the other hand, the substitution of Sb5+ decreases Tc and has a minor effect on TO-T. The coexistence of the orthorhombic and tetragonal phases at x ≤ 0.06 and y ≤ 0.06 near room temperature and the strong covalence of Sb lead to significant improvements in the piezoelectric properties. For the (K0.5Na0.5) 0.94Li0.06(Na0.94Sb0.06)O 3 ceramic, piezoelectric constant d33 ≤ 212 pC N -1, planar and thickness electromechanical coupling factors k P ≤ 46% and kt ≤ 47% and Tc ≤ 358 °C. The donor-type doping of BaCO3, SrCO3 or Bi 2O3 leads to further enhancements of the piezoelectric and ferroelectric properties.
URI: http://hdl.handle.net/10397/22466
ISSN: 0022-3727
EISSN: 1361-6463
DOI: 10.1088/0022-3727/40/11/036
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