Phase structure, piezoelectric properties, and stability of new K0.48Na0.52NbO3–Bi0.5Ag0.5ZrO3 lead-free ceramics
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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.
KeywordsDomain Wall Phase Boundary BaTiO3 Piezoelectric Property Ferroelectric Property
Authors gratefully acknowledge the supports of the National Science Foundation of China (NSFC Nos. 51102173, 51272164, and 51332003), the Fundamental Research Funds for the Central Universities (2012SCU04A01), and the introduction of talent start funds of Sichuan University (2082204144033). Thank Ms. Hui Wang for measuring the SEM patterns and benefical discussions.
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