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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Structure and electrical properties' investigation of (K0.5Na0.5)NbO3 - (Bi0.5Na0.5)TiO3 lead-free piezoelectric ceramics
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Structure and electrical properties' investigation of (K0.5Na0.5)NbO3 - (Bi0.5Na0.5)TiO3 lead-free piezoelectric ceramics

机译：（K0.5Na0.5）NbO3-（Bi0.5Na0.5）TiO3无铅压电陶瓷的结构和电性能的研究

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摘要

Lead-free piezoelectric ceramics (1 - x)(K0.5Na0.5)NbO3-x(Bi0.5Na0.5)TiO3 [(1 - x)KNN-xBNT] were synthesized by conventional solid-state sintering. The phase structure and electrical properties of (1 - x)KNN-xBNT ceramics are investigated. The polymorphic phase transition (from the orthorhombic to the tetragonal phase) (PPT) plays a very important role in (1 - x)KNN-xBNT ceramics. A PPT at room temperature in (1 - x)KNN-xBNT ceramics is identified for 0.02 < x <= 0.03. The (1 - x)KNN-xBNT (x = 0.025) ceramics show optimum electrical properties (d(33) similar or equal to 256 pCN(-1), d(31) = 85 pCN(-1), k(p) = 0.48, k(t) = 0.52 and T-C = 373 degrees C). The related mechanisms for high piezoelectric properties in (1 - x)KNN-xBNT (x = 0.025) ceramics are also discussed. These results indicate that the (1 - x)KNN-xBNT (x = 0.025) ceramic is a promising lead-free piezoelectric candidate material.
机译：通过常规的固态烧结合成了无铅压电陶瓷（1-x）（K0.5Na0.5）NbO3-x（Bi0.5Na0.5）TiO3 [（1-x）KNN-xBNT]。研究了（1-x）KNN-xBNT陶瓷的相结构和电性能。多晶相转变（从正交相到四方相）（PPT）在（1-x）KNN-xBNT陶瓷中起着非常重要的作用。确定（1-x）KNN-xBNT陶瓷在室温下的PPT为0.02

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