Abstract
CuAlO2, with a relative higher conductivity than other ceramics, is a potential candidate in microwave absorption fields. Herein, to enhance the wide-range efficient microwave absorption property of CuAlO2 powders, Fe-doped CuAlO2 powders were synthesized via a facile sol–gel method. The X-ray diffraction results displayed that 5 at.% Fe doping CuAlO2 powders maintained the original delafossite structure and excessive Fe doping could destroy the structure of CuAlO2. When the Fe doping content increased to 20 at.%, FeAl2O4 phase formed. The Fe doping had significant effects on the electromagnetic parameters of samples. Compared with pure CuAlO2, the Fe-doped CuAlO2 powders have a higher ε″ and µ″, which is beneficial to improve the electromagnetic absorption property. The calculated reflection loss curves demonstrated that the sample with at.% Fe doping displayed the most excellent microwave absorption property in thickness of 3.93 mm, showing a minimum reflection loss of − 20.5 dB at the frequency of 9.86 GHz and reflection loss below − 10 dB in the whole measured frequency. Compared with other potential high temperature microwave absorption materials, Fe-doped CuAlO2 powders exhibit a wide-range microwave absorption property.
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Acknowledgements
This work was financially supported by Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2017JQ5078), supported by the fund of the State Key Laboratory of Solidification Processing in NWPU No. SKLSP201836, and the research starting foundation from Shaanxi University of Science and Technology (Grant No.2016BJ-30).
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Su, J., He, L., Zhou, W. et al. Achieving excellent wide-range efficient microwave absorption property by synthesis of Fe-doped CuAlO2 powders via a facile sol–gel route. J Mater Sci: Mater Electron 31, 9328–9334 (2020). https://doi.org/10.1007/s10854-020-03472-x
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DOI: https://doi.org/10.1007/s10854-020-03472-x