文章基本信息

标题：Ferroelectric KNNT Fibers by Thermoplastic Extrusion Process: Microstructure and Electromechanical Characterization
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作者：Tony Lusiola ; Ali Hussain
期刊名称：Actuators
电子版ISSN：2076-0825
出版年度：2015
卷号：4
期号：2
页码：99-113
DOI：10.3390/act4020099
语种：English
出版社：MDPI Publishing
摘要：B-site substitution in KNN with tantalum results in a higher d33 and dielectric constant. This higher value makes KNNT interesting for lead-free actuator applications. KNNT fibers with diameters of 300 and 500 μm have been extruded and sintered at 1200 °C in a KNNT-enriched atmosphere. Subsequently, the influence of fiber diameter on the microstructure (porosity and grain size) was investigated. The measurements revealed that with decreasing fiber diameter, the porosity increases, whereas the grain size decreases. The influence of these microstructural differences on the piezoelectric properties was evaluated using a novel characterization procedure for single fibers. The larger diameter fibers show an increase in the electromechanical properties measured, i.e., d33, tanδ, Pr, Ec and the free longitudinal fiber displacement, when compared to smaller diameter fibers. The lower alkali losses result in a larger grain size, a higher density during sintering and lead to higher electromechanical properties.
关键词：KNNT; fibers; dielectric constant; fiber diameter KNNT ; fibers ; dielectric constant ; fiber diameter