Electrostriction effects in space charge measurements with the pulsed electroacoustic method for ceramics

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2023-09-15 DOI:10.1007/s10832-023-00332-y

Sebastian Stark, Xinyi Ma

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Abstract

The pulsed electroacoustic (PEA) method is an established method for space charge measurements in polymeric dielectrics. In view of the poorly understood impact of space charge on the electrical resistivity and the dielectric breakdown behavior of ceramics, it is desirable to adapt the PEA technique to these materials. However, this adaption is non-trivial due to the constitutive properties of ceramics, which are, at least in part, very different from that of polymers. This contribution addresses a particular effect related to the electrostrictive properties of ceramics on the theoretical level. It is shown that these properties may cause an inversion of the sign of the sound wave generated by electrical voltage pulses when compared to typical polymers, which may in turn result in an incorrect interpretation of the measurement results. Using this finding, a reinterpretation of previous experimental results suggests that homo charge forms at the cathode in sheets of alumina ceramics subjected to high voltages.

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用脉冲电声法测量陶瓷空间电荷时的摩擦效应

脉冲电声 (PEA) 方法是测量聚合物电介质中空间电荷的一种成熟方法。鉴于人们对空间电荷对陶瓷电阻率和介电击穿行为的影响知之甚少，因此希望将脉冲电声技术应用于这些材料。然而，由于陶瓷的构成特性（至少部分特性）与聚合物的构成特性有很大不同，因此这种调整并非易事。这篇论文从理论层面探讨了与陶瓷的电致伸缩特性有关的一种特殊效应。研究表明，与典型的聚合物相比，这些特性可能会导致电压脉冲产生的声波符号发生反转，进而导致对测量结果的错误解释。根据这一发现，对以前实验结果的重新解释表明，在承受高电压的氧化铝陶瓷片中，阴极会形成同种电荷。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.