Dielectric and Piezoelectric Properties of (1-x)K_0.5Bi_0.5TiO_(3-x)Ba(Ti_(0.8)Zr_(0.2))O_3 Ceramics

摘要

The properties of relaxor ceramics in the compositional series (1-x)K_0.5Bi_0.5TiO_(3-x)Ba(Ti_(0.8)Zr_(0.2))O_3 have been investigated. Values of T_m the temperature of maximum relative permittivity, decreased from 380℃ at x = 0.0 to below room temperature for x＞0.7. Compositions x = 0.1 and 0.2 were piezoelectric and ferroelectric. The maximum value of d_(33) piezoelectric charge coefficient, 130 pC/N, and strain, 0.14%, occurred at x = 0.1. Piezoelectric properties of x = 0.1 were retained after thermal cycling from room temperature to 220℃, consistent with results from high-temperature X-ray diffraction indicating a transition to single-phase cubic at ～300℃.