Coexistence of excellent piezoelectric performance and high Curie temperature in KNN based lead free piezoelectric ceramics
Abstract A new KNN based lead free piezoelectric material system of (1 x)K0.4Na0.6Nb0.96Sb0.04O3 x(Bi0.45Sm0.05)Na0.5ZrO3 (abbreviated as KNNS xBSNZ, 0.00 x 0.06) is designed to obtain high performance to meet the requirement of next generation electronic devices. The relevant electric properties such as piezoelectricity, strain, and temperature stability are analyzed in detail. An excellent comprehensive property (d33~508 pC/N, TC~268 degC) is obtained in ceramic with x 0.04 through the construction of rhombohedral orthorhombic tetragonal (R O T) phase boundary. In addition, a good temperature stability of strain for KNNS 0.04BSNZ ceramic is also obtained within the range from room temperature to 175 degC (Suni100degC/SuniRT~97.81% Suni150degC/SuniRT~84.67% which is comparatively superior to some reported KNN based ceramics and lead based ceramics. Therefore, we believe that this new material system would be a promising lead free candidate for the practical applications.