Lead-free piezoelectric ceramics ( 1 − x)(Na 0.53 K 0.404 Li 0.066 ) Nb 0.92 Sb 0.08 O 3 +x SrTiO 3 are fabricated by conventional solid-state sintering method, and their dielectric and piezoelectric characteristics are investigated. With the addition of SrTiO 3 , the growth of the grain size is restrained, meanwhile the phase transition temperature of orthorhombic-tetragonal is shifted below room temperature. It is found that the ceramics with x = 0.010 exhibit excellent piezoelectric properties (d 33 = 220 pC/N, k p = 41%, k t = 39%) and improved thermal stability around room temperature. The results indicate that these materials are promising lead-free piezoceramics for practical operations.
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Du et al. (2009) studied this question.
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