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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites
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Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

机译：双层陶瓷/陶瓷复合材料增强无铅铁电体的机电性能

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摘要

The macroscopic electromechanical behavior of lead-free bilayer composites was characterized at room temperature. One layer consisted of a nonergodic relaxor, (BiNa)TiO???7BaTiO, with an electric-field-induced longrange ferroelectric order, whereas the other is understood to be an ergodic relaxor [(Bi1/2Na)TiO???25SrTiO] that undergoes a reversible electric-field-induced macroscopic nonpolar-to-polar transition. Microstructural evidence of a bilayer with low diffusion between the two components is also demonstrated. By taking advantage of the different macroscopic strain??? and polarization???electric-field responses of the two constituents, internal mechanical and electrical fields can be developed that enhance the unipolar strain over that expected by a rule of mixtures approximation, thereby improving the properties needed for application of such materials to actuator systems. It is possible through further tailoring of the volume fractions and macroscopic properties of the constituents to optimize the electromechanical properties of multilayer lead-free ferroelectrics.
机译：在室温下表征了无铅双层复合材料的宏观机电行为。一层由具有电场感应的远距离铁电有序的非遍历弛豫物（BiNa）TiO·7BaTiO组成，而另一层被认为是遍历弛豫物[（Bi1 / 2Na）TiO·25SrTiO]。经历可逆电场感应的宏观非极性到极性的转变。还证明了在两个组分之间具有低扩散的双层的微观结构证据。通过利用不同的宏观应变？？？和极化的两种成分的电场响应，可以产生内部机械和电场，从而增强单极应变，超过混合物近似法则所期望的应变，从而改善将这种材料应用于执行器系统所需的性能。通过进一步调整成分的体积分数和宏观性能，可以优化多层无铅铁电体的机电性能。

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