High piezoelectric properties and good temperature stabilities of CuO-modified Ba(Ti_(0.96)Sn_xZr_(0.04-x))O_3 ceramics

摘要

In order to obtain both high piezoelectric property and good temperature stability in BaTiO_3-based ceramics in the common usage temperature range, Sn~(4+) and Zr~(4+) are co-doped into BaTiO_3 ceramics according to the formula of Ba(Ti_(0.96)Sn_xZr_(0.04-x))O_3 (BTSZ) (x = 0.01-0.4) with 1 mol% CuO being added as sintering-aid in this study. The CuO-modified BTSZ ceramics show both high piezoelectric properties and good temperature stability. Particularly, the CuO-modified Ba(Ti_(0.96)Sn_(0.01)Zr_(0.03))O_3 ceramic displays the high piezoelectric properties of d_(33) = 350 pC/N, k_p = 49.5% at room-temperature and a weak temperature dependence of k_p in the temperature range of -15℃ and 60℃. Moreover, the CuO-modified Ba(Ti_(0.96)Sn_(0.01)Zr_(0.03))O_3 ceramic shows stable thermal aging behavior with the d_(33) being almost unchanged until the aging temperature of 100℃, which is even higher than its Curie temperature. The high piezoelectric properties of CuO-modified Ba(Ti_(0.96)Sn_(0.01)Zr_(0.03))O_3 ceramic were ascribed to the dense microstructure with small and uniform grain size distribution. The stable thermal aging behavior can be explained by the aging effect based on the defect dipolar model.