Bi1/2Na1/2Ti1-x(Mo1/3W1/3)xO3系无铅压电陶瓷介电和压电性能的研究

摘要

采用传统固相法制备出了Bi1/2Na1/2Ti1-x(Mo1/3W1/3)xO3(简称BNT-MW-100x)系无铅压电陶瓷材料,研究了Mo和W掺杂对BNT基陶瓷材料显微结构和电学性能的影响.研究结果表明,Mo和W掺杂并未影响BNT陶瓷的晶体结构,仍为纯钙钛矿型结构,而且致密性良好.当x=0.9%时,BNT-MW陶瓷的压电常数最大,d33=108 pC/N,平面机电耦合系数最大,kp=0.153.%Lead-free piezoelectric ceramics, Bi1/2Na1/2Ti1-x(Mo1/3W1/3)xO3 (abbreviated as BNT-MW-100x), were fabricated by a conventional solid state reaction method. The effects of the doping of Mo and W on the microstructure and electric properties of the ceramics were investigated. The results showed that the BNT-based ceramics with Mo and W doping did not change in the crystal structure but still exhibited a pure perovskite phase with a dense structure. They had the maximum values at x=0.9%, where the Bi1/2Na1/2Ti1-x(Mo1/3W1/3)xO3 ceramics exhibited the highest piezoelectric constant of d33=108pC/N, together with the largest planar electromechanical coupling factor of 0.153.