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Published in:
01-07-2014
Phase structure, piezoelectric properties, and stability of new K0.48Na0.52NbO3–Bi0.5Ag0.5ZrO3 lead-free ceramics
Published in: Journal of Materials Science: Materials in Electronics | Issue 7/2014
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Abstract
In this work, (1 − x)(K0.48Na0.52)NbO3–x(Bi0.5Ag0.5)ZrO3 [(1 − x)KNN–xBAZ] lead-free piezoceramics was prepared by the conventional solid-state method, and a new phase boundary consisting of three phases [e.g., rhombohedral, orthorhombic, and tetragonal (R–O–T) phases] has been constructed by adding both (Bi0.5Ag0.5)2+ and Zr4+. The ceramic with x = 0.05 possesses an R–O–T phase coexistence. A large d
33 of ~347 pC/N and a high T
C of ~318 °C have been shown in the ceramic with x = 0.05. In addition, such a ceramic also possesses enhanced thermal and temperature stability of piezoelectricity and ferroelectricity. Both the phase boundary and the grain size play a critical role in large piezoelectricity and good stability. We think that this material belongs to be one of the promising candidates for the high-temperature piezoelectric devices.