Analysis of the complex dielectric permittivity behavior of porous Al_2O_3−SiC composites in the 1 MHz to 18 GHz frequency range
Analysis of the complex dielectric permittivity behavior of porous Al_2O_3−SiC composites in the 1 MHz to 18 GHz frequency range
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DOI：
10.1557/jmr.2007.0447
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发表时间：
2006-03
影响因子：
2.7
通讯作者：
J. Battat;J. Calame
中科院分区：
文献类型：
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作者：
J. Battat;J. Calame
在 0.001 至 18 GHz 范围内，测量了电损耗多孔 Al_2O_3−SiC 复合材料的复介电常数作为频率的函数。这些复合材料是通过将 SiC 聚合物前体掺入多孔氧化铝盘中的灌注方法制造的。重复聚合物注入和热解步骤至 1000 °C，其中一些样品在每个后续步骤之前经历额外的空气火灾。一般来说，发现对于非空气发射的样品，在较宽的频率范围内可以获得适度的、可控的损失。相比之下，空气烧制样品可获得的介电损耗通常非常低。对于所有样品，分析了介电常数分量ε′和ε″随频率变化的各个方面，以确定影响介电响应的各种因素。还使用扫描电子显微镜进行微观结构分析。
The complex dielectric permittivity of electrically lossy, porous Al_2O_3−SiC composites was measured as a function of frequency over the range of 0.001 to 18 GHz. These composites were fabricated by an infusion method of incorporating SiC polymer precursor into porous alumina disks. Repeat polymer infusions and pyrolysis steps to 1000 °C were carried out, with some samples undergoing an additional air fire prior to each subsequent step. Generally, it was found that for non-air-fired samples, moderate, controllable losses were attainable over a broad frequency range. By contrast, the dielectric loss attainable for air-fired samples was generally very low. For all samples, various aspects of the variation of permittivity components ∈′ and ∈″ with frequency were analyzed, with a view to determine the various factors contributing to dielectric response. Microstructure analysis using scanning electron microscopy was also performed.