Preparation and microwave dielectric properties of SiO2 ceramics by aqueous Sol–Gel technique
Preparation and microwave dielectric properties of SiO2 ceramics by aqueous Sol–Gel technique
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DOI：
10.1016/j.jallcom.2012.11.168
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发表时间：
2013-05
影响因子：
6.2
通讯作者：
Chengxi Hu;Peng Liu
中科院分区：
文献类型：
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作者：
Chengxi Hu;Peng Liu
采用溶胶-凝胶法在室温下成功合成了平均粒径为174 nm的高活性无定形SiO2纳米球。以SiO2纳米球为原料制备SiO2陶瓷，研究了不同温度下SiO2陶瓷的微波介电性能。采用差热分析（DTA-TG）、X射线粉末衍射（XRD）和扫描电镜（SEM）等分析手段，研究了材料的相组成、烧结特性和显微结构。最后得到了εr = 3.52，Q值为92400 GHz，τ r =-14.5ppm/°C的优良微波性能。与传统固相法相比，水溶胶-凝胶法制备SiO2陶瓷的最佳烧结温度降低了125°C。SiO2陶瓷的Q·ε和ε r值对测量温度敏感，这可以用简单的复合介电模型来解释。
Highly reactive amorphous SiO2nanospheres were successfully synthesized at room temperature in atmosphere with a mean particle size of 174nm by a Sol–Gel method. SiO2ceramics were prepared using SiO2nanospheres and their microwave dielectric properties were investigated at different temperatures. Phase evolution, sintering characteristics and microstructures were detected by differential thermal analysis (DTA-TG) analysis, X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). Excellent microwave properties of εr∼3.52, Q·ƒ∼92400GHz and τƒ∼−14.5ppm/°C, were obtained finally. The optimum sintering temperature of SiO2ceramics was reduced 125°C by aqueous Sol–Gel process compared to a conventional solid-state method. The Q·ƒ and εrvalues of SiO2ceramics are sensitive to the measured temperatures, which was explained by a simple composite dielectric model.