【摘 要】
：
Lead-free piezoelectric ceramics (Na,0.53K,0.422Li,0.048) (Nb,0.89Sb,0.06Ta,0.05) O,3 (NKLNST)+x mol SrCO,3 are prepared by conventional solid state sintering m
【机 构】
：
School of Physics, State Key laboratory of Crystal Material, Shandong University, Jinan 250100
论文部分内容阅读
Lead-free piezoelectric ceramics (Na,0.53K,0.422Li,0.048) (Nb,0.89Sb,0.06Ta,0.05) O,3 (NKLNST)+x mol SrCO,3 are prepared by conventional solid state sintering method. The specimens with pure perovskite structure show tetragonal phase at x≤0.01, and become pseudo-cubic phase at x≥0.02. A lattice parameter discontinuity is found in the specimens with 0.004≤x≤0.0075, along with a great improvement in piezoactivity. The 0.004mol SrCO,3 added NKLNST ceramics possesses outstanding performances of k,p=0.53, k,t=0.26, and d,33=309pC/N. Moreover, the Sr2+ modification inhibits the grain growth, decreases the Curie temperature, and induces a diffuse phase transition.
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