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Multiple-dielectric relaxations and excellent microwave absorption properties of LaMnO3+δ powders

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Abstract

Two-dimensional lamellar LaMnO3+δ powders comprised of nanoparticles were prepared by a citric acid-assisted sol–gel route. The calcined samples (60 wt%)-paraffin composites exhibit excellent microwave absorption properties. For all of the samples calcined at 700–900 °C in interval of 100 °C for 4 h under atmosphere, effective bandwidth (RL<-10dB) can cover 2–18 GHz at matching thickness of 1–5.5 mm. The optimal reflection loss (RL) of the samples calcined at 900 °C is −24 dB at 8.0 GHz with a thickness of 2 mm. The excellent microwave absorption ability can be rationally attributed to microstructures and multiple-dielectric relaxation behaviors.

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Acknowledgements

This work has been supported by National Natural Science Foundation of China under Grant No. 51601120; Natural Science Foundation of Education Department of Liaoning Province (L2015396); Science Research Foundation of Science and Technology Bureau of Shenyang (F15-163-4-00).

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Authors and Affiliations

  1. School of Science, Shenyang University of Technology, 110870, Shenyang, People’s Republic of China

    Xiaolei Wang, Liwei Sun, Xiukun Bao & Guimei Shi

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  1. Xiaolei Wang
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  2. Liwei Sun
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  3. Xiukun Bao
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Correspondence to Xiaolei Wang.

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Wang, X., Sun, L., Bao, X. et al. Multiple-dielectric relaxations and excellent microwave absorption properties of LaMnO3+δ powders. J Mater Sci: Mater Electron 28, 10457–10463 (2017). https://doi.org/10.1007/s10854-017-6818-5

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