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CaZrO3-modified (K0.48Na0.48Li0.04)(Nb0.95Sb0.05)O3 (CZ-KNLNS) lead-free  piezoelectric powders were synthesized by microwave method followed by  conventional solid state sintering. Different amounts of CaZrO3 were added  (i.e. x = 0, 0.02, 0.03, 0.04, 0.06 mol) and their effects on the crystal  structure, microstructure, as well as the electrical properties, were  investigated. The results showed that CZ-KNLNS powders could be obtained by  microwave heating at a relatively low temperature and short time of 650 °C  and 10min, respectively. The obtained CZ-KNLNS powders have cubic structure  and good crystallinity with average particle size of 300-700 nm. The  particle size gradually decreases with the increase of CaZrO3 amount,  indicating that addition of CaZrO3 inhibits the growth of the particles. The  powders were further sintered at 1120 °C for 4 h and CZ-KNLNS ceramics with  homogeneous and highly dense microstructure were obtained. X-ray diffraction  showed that, with increasing CaZrO3 content, the phase structure gradually  changed from orthorhombic to rhombohedral, which can be considered as the  coexistence zone of orthorhombic-rhombohedral (O-R) phase in the range of  0.03 < x < 0.06. The optimized content of CaZrO3 is x = 0.04, at which the  CZ-KNLNS piezoelectric ceramics show good properties and maximum d33 = 201.2  pC/N and Kp = 36.8%.

Structure and piezoelectric properties of cazro3-modified (K,Na,Li)(Nb,Sb)O3 ceramics prepared from powders synthesized by microwave heating