Preparation and Properties of Sr_2NaNb_50_(15) Lead-Free Piezoelectric Ceramics by Sol-Gel Method

摘要

Sr_2NaNb_5O_(15) ceramic powders have been synthesized by sol-gel method, ceramics were sintered via a pressureless sintering method. The effect of calcining temperature on the phase composition and microstructure of ceramic powders were investigated by TG-DSC, XRD and SEM analyses. The influence of sintering temperature on density, microstructure and properties of the ceramics were systematically analyzed. The results showed that the optimal calcining temperature was 1300°C, the average size of ceramic powders was about 3 urn. When the sintering temperature was 1300°C, the ceramics showed optimized densification and electrical properties(/7=4.663 g/cm~3, d_(33)=45 pC/N, 5=1126, tanδ0.027, E_c=17.91 kV/cm, P_r=6.72 |iC/cm~2, P_s=9.45 uC/cm~2)