Effect of aluminum doping on microwave absorption properties of ZnO / ZrSiO 4 composite ceramics

科研成果: 期刊稿件文章同行评审

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摘要

In this study, Al-doped ZnO particles are infiltrated into porous ZrSiO 4 substrates to form an Al-doped ZnO/ZrSiO 4 composite ceramic using sol-gel process. The doping of aluminum results in the high-concentration carriers, leading to the improvement of polarization capability and electric conductivity. When the Al content increases to 2.5 at.%, particle shape is changed from spherical into flower-like one, and the electric conductivity of ZnO/ZrSiO 4 composite ceramics is further improved. Therefore, both dielectric loss and microwave absorption properties of ZnO/ZrSiO 4 composite ceramics increase with the increase of Al content. The further increase of Al content leads to the production of ZnAl 2O 4, which is a low-permittivity ceramic, so the dielectric constant and dielectric loss of ZnO/ZrSiO 4 composite ceramics show a decreasing tendency. Owing to the higher dielectric loss, the 2.5 at.% Al-doped ZnO/ZrSiO 4 composite ceramics exhibit the best microwave absorption properties over the frequencies ranging from 8.2 to 12.4 GHz (X-band).

源语言英语
页(从-至)3158-3165
页数8
期刊Journal of the American Ceramic Society
95
10
DOI
出版状态已出版 - 10月 2012

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