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Research Article

The point defect and electronic structure of K doped LaCo0.9Fe0.1O3 perovskite with enhanced microwave absorbing ability

Fan Wang1, Weihua Gu1, Jiabin Chen1, Yue Wu1, Ming Zhou1, Shaolong Tang2, Xingzhong Cao3, Peng Zhang3, Guangbin Ji1( )
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
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Graphical Abstract

La1−xKxCo0.9Fe0.1O3 perovskites were successfully prepared by sol-gel method, which obtained electromagnetic wave attenuation of a wide bandwidth of 6.2 GHz. Significantly, the attenuation mechanism was further investigated by the positron annihilation lifetime spectroscopy and charge density difference and oxygendensity of states, showing an effective method for the study of excellent microwave absorption.

Abstract

ABO3 perovskites, owning unique properties, have great research prospect in electromagnetic wave absorption field. Normally, doping can significantly regulate the dielectric loss, whereas the magnetic loss can be ignored. In this work, the crystal structure and electromagnetic properties can be regulated systematically by the K, Fe co-doping for LaCoO3 perovskites (LKCFO) under the condition of fixed F content. In addition, the obtained samples show the obvious interfacial polarization effect on accounting to the small size effect, which is conducive to the effective microwave absorption. By analyzing the evolution of the positron annihilation lifetime and the first-principles calculation of the oxygen density of states for the series of LKCFO perovskites, it is found that the charge transport characteristics will be controlled by the point defect generated by allelic doping. The point defect content decreases and then increases as the doping level rises. The prepared perovskite exhibits the lowest defect density and the largest dielectric loss capability, which indicates that the lower point defects promote electron migration and thus enhance the dielectric loss; thus, the electromagnetic wave absorption bandwidth up to 6.2 GHz is reached. In contrast, both insufficient and excessive K doping are detrimental to the enhancement of microwave absorption. Especially, the practical application value was investigated using Computer Simulation Technology (CST) simulations. The LKCFO-2 exhibits the smallest RCS value (below −10 dBm2) at almost −90°– 90° with a thickness of 2 mm, providing an effective method for study excellent microwave absorption and scattering property.

Keywords

microwave absorptionperovskitesdopingeffective bandwidthpoint defect

Electronic Supplementary Material

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Nano Research
Volume 15 Issue 4,
April 2022
Pages 3720-3728
DOI: 10.1007/s12274-021-3955-1
Cite this article:
Wang F, Gu W, Chen J, et al. The point defect and electronic structure of K doped LaCo0.9Fe0.1O3 perovskite with enhanced microwave absorbing ability. Nano Research, 2022, 15(4): 3720-3728. https://doi.org/10.1007/s12274-021-3955-1
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Received: 16 August 2021
Revised: 01 October 2021
Accepted: 25 October 2021
Published: 26 November 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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