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

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Abstract

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 (−12.1 dB) and broad effective absorption bandwidth (reflection loss less than −10 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.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Yuan Wang, Fa Luo, Ping Wei, Wancheng Zhou & Dongmei Zhu

Authors
  1. Yuan Wang
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  2. Fa Luo
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  3. Ping Wei
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  4. Wancheng Zhou
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  5. Dongmei Zhu
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Correspondence to Yuan Wang.

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Wang, Y., Luo, F., Wei, P. et al. Enhanced Dielectric Properties and High-Temperature Microwave Absorption Performance of Zn-Doped Al2O3 Ceramic. J. Electron. Mater. 44, 2353–2358 (2015). https://doi.org/10.1007/s11664-015-3787-4

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  • DOI: https://doi.org/10.1007/s11664-015-3787-4

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