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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.122  No.1426 (June) (2014)  >  pp.398-401

Journal of the Ceramic Society of Japan
<<Previous article Vol.122  No.1426 (June) (2014)   pp.398 - 401 Next article>>

Dielectric and piezoelectric properties of lead-free K0.5Na0.5NbO3–LiSbO3–Bi0.5Li0.5TiO3 system

Tohru MORIYAMA1), Akinori KAN1), Susumu TAKAHASHI1), Hirotaka OGAWA1)
1) Graduate school of Science and Technology, Meijo University

The effects of Bi, Li and Ti substitutions for K, Na, Li, Nb and Sb on the piezoelectric properties of (1 – x)(K0.474Na0.474Li0.052)(Nb0.948Sb0.052)O3xBi0.5Li0.5TiO3 [(1 – x)KNLNS–xBLT] ceramics were investigated. X-ray powder diffraction profiles indicate the formation of a morphotropic phase boundary (MPB) between the orthorhombic and tetragonal phases in the (1 – x)KNLNS–xBLT ceramics. The ratio of tetragonal to orthorhombic phase increased with x, which suggests a decrease in the orthorhombic-tetragonal phase transition temperature (TO–T). The dielectric constant at room temperature was increased by the substitution of Bi, Li and Ti for K, Na, Li, Nb and Sb. In addition, the temperature dependence of the dielectric constant indicated a TO–T shift from approximately 90°C to room temperature, and resulted in a piezoelectric constant of 272 pC/N for the 0.98KNLNS-0.02BLT (x = 0.02) ceramic.


Keyword:
Lead-free, MPB, K0.5Na0.5NbO3, Piezoelectric properties, Ferroelectric properties

Received: November 29, 2013
Accepted: January 23, 2014 , Published online: June 01, 2014
Copyright © 2014 The Ceramic Society of Japan

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