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Title: Dielectric and piezoelectric properties of K₀.₅ Na₀.₅ NbO₃-AgSbO₃lead-free ceramics
Authors: Lin, Dunmin
Kwok, Kin-wing
Chan, Helen L. W.
Subjects: Crystal structure
Ferroelectric transitions
Potassium compounds
Silver compounds
Sodium compounds
Thermal stability
X-ray diffraction
Issue Date: 1-Aug-2009
Publisher: American Institute of Physics
Source: Journal of applied physics, 1 Aug. 2009, v. 106, no. 3, 034102, p. 1-5.
Abstract: Lead-free piezoelectric ceramics (1−x) K₀.₅Na₀.₅NbO₃–xAgSbO₃+0.75 mol % MnO₂were prepared by a conventional solid-state sintering technique, and the piezoelectric and dielectric properties of the ceramics were studied. The results of x-ray diffraction suggest that AgSbO₃diffuses into the K₀.₅Na₀.₅NbO₃lattices to form a new solid solution with a single-phase orthorhombic perovskite structure. After the addition of AgSbO₃, the paraelectric cubic-ferroelectric tetragonal phase transition temperature (Tc) and the ferroelectric tetragonal-ferroelectric orthorhombic phase transition temperature (T[sub O-T]) decrease, and the ceramics become “softened,” resulting in significant improvements in the ferroelectric and piezoelectric properties. The ceramics with x=0.03–0.10 exhibit excellent piezoelectric properties: D₃ ₃=130–216 pC/N, k[sub p]=0.44–0.51, and k[sub t]=0.40–0.52. The ceramics also exhibit a good thermal stability up to high T[sub O-T], suggesting that the ceramics are promising candidates for lead-free piezoelectric ceramics.
Rights: © 2009 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, K.W. Kwok & H.L.W. Chan. J. Appl. Phys. 106, 034102 (2009) and may be found at
Type: Journal/Magazine Article
DOI: 10.1063/1.3186039
ISSN: 0021-8979 (print)
1089-7550 (online)
Appears in Collections:MRC Journal/Magazine Articles
AP Journal/Magazine Articles

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