Phase Transition and High Piezoactivity of Sr Doped Lead-Free (Na0.53K0.422Li0.048)(Nb0.89Sb0.06Ta0.05)O3 Ceramics
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Abstract
Lead-free piezoelectric ceramics ((Na0.53K0.422Li0.048)(Nb0.89Sb0.06Ta0.05)O3 (NKLNST) + x mol SrCO3 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 SrCO3 added NKLNST ceramics possesses outstanding performances of kp=0.53, kt =0.26, and d33=309pC/N. Moreover, the Sr2+ modification inhibits the grain growth, decreases the Curie temperature, and induces a diffuse phase transition. -
References
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