Enhanced Dielectric Properties and High-Temperature Microwave Absorption Performance of Zn-Doped Al2O3 Ceramic

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• 作者：Yuan Wang ; Fa Luo ; Ping Wei ; Wancheng Zhou ; Dongmei Zhu
• 关键词：Al2O3 ceramic ; doping ; dielectric property ; high temperature ; microwave absorption
• 刊名：Journal of Electronic Materials
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：44
• 期：7
• 页码：2353-2358
• 全文大小：1,412 KB
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• 作者单位：Yuan Wang (1)
  Fa Luo (1)
  Ping Wei (1)
  Wancheng Zhou (1)
  Dongmei Zhu (1)
  
  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  Electronics, Microelectronics and Instrumentation
  Solid State Physics and Spectroscopy
  
• 出版者：Springer Boston
• ISSN：1543-186X

文摘

To improve the dielectric and microwave absorption properties of Al₂O₃ ceramic, Zn-doped Al₂O₃ ceramic was prepared by conventional ceramic processing. X-ray diffraction analysis confirmed that Zn atoms successfully entered the Al₂O₃ ceramic lattice and occupied Al sites. The complex permittivity increased with increasing Zn concentration, which is mainly attributed to the increase in charged vacancy defects and densification of the Al₂O₃ ceramic. In addition, the temperature-dependent complex permittivity of 3% Zn-doped Al₂O₃ ceramic was determined in the temperature range from 298?K to 873?K. Both the real and imaginary parts of the complex permittivity increased monotonically with increasing temperature, which can be ascribed to the shortened relaxation time and increasing electrical conductivity. The increased complex permittivity leads to a great improvement in microwave absorption. In particular, when the temperature is up to 873?K, the 3% Zn-doped Al₂O₃ ceramic exhibited the best absorption performance with a maximum peak (?2.1?dB) and broad effective absorption bandwidth (reflection loss less than ?0?dB from 9.3?GHz to 12.3?GHz). These results reveal that Zn-doped Al₂O₃ ceramic is a promising candidate for use as a kind of high-temperature microwave absorption material.