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Research Article

The dielectric behavior and efficient microwave absorption of doped nanoscale LaMnO3 at elevated temperature

Zhigang Mu1, Guoke Wei2( ), Hang Zhang2, Lu Gao2, Yue Zhao1, Shaolong Tang3, Guangbin Ji1( )
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering, AVIC Manufacturing Technology Institute, Beijing 100024, China
National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
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Graphical Abstract

The complex doping effect and temperature dependence of Mn ion spin state have an important effect on the dielectric behavior of La1−xSrxMn1−yFeyO3 perovskite materials at high temperature. The content of Mn3+ in the high-spin and low-spin states is dynamically changing with the increase of temperature. The spin state of Mn ions and the crystal structure of perovskite affect the high-temperature dielectric behavior of La1−xSrxMn1−yFeyO3 by acting on the double-exchange interaction, making it possible to maintain efficient absorption of electromagnetic waves in high temperature. In addition, the cellular array structure obtained by computer simulation technology (CST) simulation software can introduce magnetic loss and further improve the service temperature of materials.

Abstract

LaMnO3 perovskite has great potential in microwave absorption at high temperature due to its complex doping effect and super stability. The current research mainly focuses on the doping ratio regulation, while the mechanism of doping effect at high temperature is still lack of sufficient investigation. In this work, La1−xSrxMn1−yFeyO3 (LaMnO3, La0.7Sr0.3MnO3, and La0.7Sr0.3Mn0.8Fe0.2O3) nanostructures with different doping sites were successfully prepared by the solid phase reaction method. Then, the high temperature dielectric test samples were obtained by mixing with cordierite (2MgO·2Al2O3·5SiO2 (MAS)). The results showed that the temperature dependence of Mn ion spin state had a significant impact on the high temperature dielectric behavior of La1−xSrxMn1−yFeyO3. Particularly, when the thickness is only 1.9 mm, La0.7Sr0.3Mn0.8Fe0.2O3/MAS can achieve the widest bandwidth of 4.2 GHz covered the entire X-band (8.2–12.4 GHz) and a minimum reflection loss (RL) value of −17.99 dB at 500 °C. In order to improve the operating temperature of La0.7Sr0.3Mn0.8Fe0.2O3/MAS, a cellular array structure was designed by using computer simulation technology (CST) software to introduce magnetic loss. When the outer length of the hexagon is 1 mm and the coating thickness is 1.9 mm, the widest bandwidth covers the X-band and the minimum RL value is −15.35 dB at 800 °C. Therefore, La0.7Sr0.3Mn0.8Fe0.2O3 has a great prospect as an efficient high temperature microwave absorber.

Keywords

microwave absorptiondopingperovskitehigh temperaturedielectric behavior

Electronic Supplementary Material

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Nano Research
Volume 15 Issue 8,
August 2022
Pages 7731-7741
DOI: 10.1007/s12274-022-4500-6
Cite this article:
Mu Z, Wei G, Zhang H, et al. The dielectric behavior and efficient microwave absorption of doped nanoscale LaMnO3 at elevated temperature. Nano Research, 2022, 15(8): 7731-7741. https://doi.org/10.1007/s12274-022-4500-6
Topics:
Doping (additives)
Part of a topical collection:
EM Wave Functional Materials

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Received: 08 April 2022
Revised: 01 May 2022
Accepted: 04 May 2022
Published: 03 June 2022
© Tsinghua University Press 2022
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