Electrical properties of cordierite obtained by non-hydrolytic sol–gel method

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• 作者：I. Jankovi&#x107 ; -Č ; astvan ; S. Lazarevi&#x107 ; B. Jordovi&#x107 ; R. Petrovi&#x107 ; D. Tanaskovi&#x107 ; ; Dj. Jana&#x107 ; kovi&#x107
• 关键词：Cordierite ; Sol– ; gel processes ; Sintering ; Dielectric properties
• 刊名：Journal of the European Ceramic Society
• 出版年：2007
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：2007
• 卷：27
• 期：13-15
• 页码：3659-3661
• 文件大小：434 K

摘要

Cordierite ceramic material, due to its properties such as low thermal expansion coefficient, low dielectric constant and high specific resistivity, could be used as an insulating material in high-frequency electronics, as well as a substrate for integrated circuits and electronic modules. In this paper, cordierite (2MgO·2Alb>2b>Ob>3b>·5SiOb>2b>) was synthesized by the non-hydrolytic sol–gel process combined with solvothermal treatment starting from aluminium chloride, TEOS and magnesium chloride dissolved in absolute ethanol. Crystallization of bc;-cordierite from gel occurred at temperatures between 900 and 1000 °C and a higher calcination temperature resulted in the transformation of bc;-cordierite to b1;-cordierite. Cordierite material obtained by sintering of powder in the temperature range from 1400 to 1450 °C showed values of the dielectric constants from 7.93 to 3.78 and values of dielectric loss tangents from 0.049 to 0.001.