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Effect of Changing Na/K Ratio on Structure and Electrical Properties of (Na x K y ) (Nb0.885Sb0.08)–0.035LiTaO3 Lead-Free Piezoelectric Ceramics

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(Na x K y ) (Nb0.885Sb0.08)–0.035LiTaO3 lead-free piezoelectric ceramics (N x K y NS–LT) with an excessive amount of Na or K were synthesized by conventional solid-state processes. Effects of Na/K ratio on structure and electrical properties of N x K y NS–LT ceramics were investigated. Excessive Na or K did not change the major crystal structure and barely influenced the sintering temperature, but excessive Na or K exhibited effects on grain size. Better piezoelectric properties of the ceramics were achieved when a certain amount of excessive K was added (the Na/K ratio before calcining was adjusted to 0.520:0.450). X-Ray fluorescence was used to examine the cause, and the enhanced properties are attributed to the formation of an MPB-like composition when the Na/K was changed. Specimens with properties of d 33=183 pC/N, k p=0.33, Q m =103 were obtained in this work.
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Document Type: Research Article

Affiliations: State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Publication date: 2011-06-01

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