采用传统固相法制备了在1 130 ℃下烧结而成的(K0.45Na0.55)0.98Li0.02(Nb0.77Ta0.18Sb0.05)O3 (KNLNTS)无铅压电陶瓷。陶瓷致密度和电学性能较好, 致密度达到98%, 室温压电常数为308.7 pC/N, 厚度振动机电耦合系数可达0.5, 1 kHz时介电损耗为0.043。以上述KNLNTS基粉体为原料, 利用切割填充法制备1-3型压电复合材料并研究了厚度对复合材料的性能影响。结果表明, 复合材料的压电常数、厚度振动机电耦合系数均随厚度的增加而增加, 介电损耗随厚度的增加而减少, 而相对介电常数基本保持不变。

The (K0.45Na0.55)0.98Li0.02(Nb0.77Ta0.18Sb0.05)O3 (KNLNTS) lead-free piezoelectric ceramics is synthesized by the traditional solid-state method with the sintering temperature of 1 130 ℃. The ceramic samples have good density and electric properties, with a density of 98 %, a piezoelectric constant of 308.7 pC/N, thickness vibration electromechanical coupling factor of 0.5, and dielectric loss of 0.043 at 1 kHz. Using the above-mentioned KNLNTS-based powder as the raw material, the 1-3 piezoelectric composites are prepared by the cutting and filling method, and the effect of thickness on the performance of the composites is studied. It is found that the piezoelectric constant and thickness vibration electromechanical coupling factor Kt both increase with the increase of thickness, the dielectric loss decreases with the increase of thickness, while the relative permittivity remains basically unchanged.