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Temperature dependence of piezoelectric, elastic and dielectric coefficients at radial resonance of piezoceramics with an Aurivillius-type structure

机译:具有Aurivillius型结构的压电陶瓷径向共振时压电,弹性和介电系数的温度依赖性

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摘要

Aurivillius-type structure compounds are considered good candidates for piezoelectric materials at high temperature, due to their high ferro-paraelectric phase transition temperature. Despite this fact, very few papers have been published on the study of piezoelectric properties at the expected working temperatures. An iterative automatic method has been used in this work to characterize the piezoelectric, electromechanical, and elastic properties at radial resonance of thin ceramic disks with composition (SrBi/sub 2/Nb/sub 2/O/sub 9/)/sub 0.35/(Bi/sub 3/TiNbO/sub 9/)/sub 0.65/[SBN/BTN 35/65], from room temperature up to the ferro-paraelectric phase transition. Ceramics were prepared by sintering or by recrystallization after hot-pressing of mechanically activated precursors. By this new method, ceramics with controlled texture and microstructure are obtained. The influence of the processing route in the properties of the ceramics, over the whole temperature range of piezoelectric activity, is discussed. Values of d/sub 31/=2.1 pC/N and k/sub p/=2.9% at 500/spl deg/C are achieved.
机译:Aurivillius型结构化合物由于其高铁-顺电相变温度而被认为是高温下压电材料的良好候选物。尽管如此,关于预期工作温度下的压电特性的研究却很少发表。在这项工作中使用了一种迭代自动方法来表征组成为(SrBi / sub 2 / Nb / sub 2 / O / sub 9 /)/ sub 0.35 /的薄陶瓷盘在径向共振时的压电,机电和弹性特性。 (Bi / sub 3 / TiNbO / sub 9 /)/ sub 0.65 / [SBN / BTN 35/65],从室温到铁-顺电相变。在机械活化的前体热压后,通过烧结或重结晶制备陶瓷。通过这种新方法,获得了具有受控织构和微观结构的陶瓷。讨论了在压电活性的整个温度范围内,加工路线对陶瓷性能的影响。在500 / spl deg / C时达到d / sub 31 / = 2.1 pC / N和k / sub p / = 2.9%的值。

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