Influence of B-site non-stoichiometry on electrical properties of (K0.458Na0.542)0.96Li0.04Nb0.85Ta0.15Sb x O3 ceramics
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In the study, B-site non-stoichiometric (excess) lead-free (K0.458Na0.542)0.96Li0.04Nb0.85Ta0.15Sb x O3 (KNLNS x T) ceramics were prepared by conventional mixed oxide method. The results indicate that excess Sb in an amount of ≤0. 5 mol% can diffuse into the lattice of the KNLNT ceramics and form the pure perovskite phase. The Sb excess ceramics show decreased ferroelectric properties due to the partial substitution of Sb3+ for B-site ions. The deviation of Sb from chemical stoichiometry can distinctly influence electrical properties of KNLNT ceramics. Enhanced piezoelectric activity is observed in the ceramics with a 0.5 mol% excess of Sb. The work has shown the necessity of adequately controlling B-site non-stoichiometry of KNN-based lead-free piezoelectric ceramics in obtaining the desired electrical properties.
KeywordsPiezoelectric Property Ferroelectric Property Optimum Sinter Temperature Conventional Mixed Oxide Method Planar Electromechanical Coupling Factor
This work was supported by the National Natural Science Foundation of China (Nos. 51302124, 51372110 and 51402114), the Research Foundation of Liaocheng University (No. 318011306) and the National High Technology Research and Development Program of China (No. 2013AA030801).
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