标称顺电陶瓷中的极性纳米团簇展示了用于无线通信的高微波可调谐性
Polar nano-clusters in nominally paraelectric ceramics demonstrating high microwave tunability for wireless communication
摘要：
在微波频率下具有高可调谐性的介质材料是微波通信系统设计中的关键部件。致密的Ba0.6Sr0.4TiO3（BST）陶瓷，具有不同的晶粒尺寸，制备，以优化介电可调谐性通过极性纳米团簇效应。介电常数和损耗测量进行了高，低频率，并支持从X-射线粉末衍射，扫描和透射电子显微镜，拉曼光谱和piezoresponse力显微镜的结果。极性纳米团簇的浓度，其尺寸被认为是在20至50 nm的范围内，和介电可调谐性随着晶粒尺寸的增加而增加。提出了一种测量体硅微波调谐度的新方法。在平均晶粒尺寸为10 μ m的陶瓷中实现了32%的最高可调谐性。BST陶瓷的可调谐性与施加的直流电场是证明在一个原型的小型谐振天线。
英文摘要：
Dielectric materials, with high tunability at microwave frequencies, are key components in the design of microwave communication systems. Dense Ba0.6Sr0.4TiO3 (BST) ceramics, with different grain sizes, were prepared in order to optimise the dielectric tunability via polar nano cluster effects. Dielectric permittivity and loss measurements were carried at both high and low frequencies and were supported by results from X-ray powder diffraction, scanning and transmission electron microscopies, Raman spectroscopy and piezoresponse force microscopy. The concentration of polar nano clusters, whose sizes are found to be in the range 20 to 50 nm, and the dielectric tunability increase with increasing grain size. A novel method for measurement of the microwave tunability in bulk dielectrics is presented. The highest tunability of 32% is achieved in ceramics with an average grain size of 10 um. The tunability of BST ceramics with applied DC field is demonstrated in a prototype small resonant antenna.
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