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Title: Dielectric and piezoelectric properties of (K[sub 0.5]Na[sub 0.5])NbO₃-Ba(Zr[sub 0.05]Ti[sub 0.95])O₃ lead-free ceramics
Authors: Lin, Dunmin
Kwok, Kin-wing
Chan, Helen L. W.
Subjects: Barium compounds
Dielectric polarisation
Manganese compounds
Potassium compounds
Sodium compounds
Solid-state phase transformations
Issue Date: 4-Oct-2007
Publisher: American Institute of Physics
Source: Applied physics letters, 4 Oct. 2007, v. 91, 143513, p. 1-3.
Abstract: Lead-free ceramics (1−x)(K[sub 0.5]Na[sub 0.5])NbO₃-xBa(Zr[sub 0.05]Ti[sub 0.95])O₃ doped with 1 mol % MnO₂ have been fabricated by pressureless sintering. With the MnO₂ doping, all the ceramics can be well sintered at 1100–1160 °C and exhibit a dense and pure perovskite structure. After the addition of Ba(Zr[sub 0.05]Ti[sub 0.95])O₃, a relax behavior is induced and both the cubic-tetragonal and tetragonal-orthorhombic phase transitions shift to lower temperatures. Coexistence of the orthorhombic and tetragonal phases is hence formed in the ceramics with 0.04<x<0.07 at room temperature. It is suggested that owing to the more possible polarization states resulting from the coexistence of the two phases, the piezoelectric and dielectric properties of the ceramics are enhanced significantly. The ceramic with x=0.06 exhibits the following optimum properties: d₃₃=234 pC/N, k[sub p]=0.49, k[sub t]=0.48, ε[sub r]=1191, tan δ=1.20%, and T[sub C]=318 °C.
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.M. Lin, K.W. Kwok and H.L.W. Chan, Appl. Phys. Lett. 91, 143513 (2007) and may be found at
Type: Journal/Magazine Article
DOI: 10.1063/1.2794798
ISSN: 0003-6951
Appears in Collections:MRC Journal/Magazine Articles
AP Journal/Magazine Articles

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