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In the context of the fifth-generation (5G) smart era, the demand for electromagnetic wave (EMW)-absorbing materials has become increasingly prominent, so it is necessary to explore promising candidate materials. This work focuses on the exploration of the material absorbing properties of a MoAlB MAB (MAB represents a promising group of alternatives, where M stands for a transition metal, A typically denotes Al, and B is boron) phase system. First, the first-principles calculations were performed to reveal the unique crystal and layered structure of the MoAlB ceramics and to predict their potential for use as an EMW absorption material. Subsequently, a series of MoAlB ceramics were synthesized at temperatures ranging from 800 to 1300 °C, and the influence of temperature on the phase compositions and microstructures of the obtained MoAlB ceramics was characterized and analyzed. Finally, the practical EMW absorption performance of the prepared MoAlB ceramics was evaluated via a combination of experiments and radar cross-sectional calculations. The MoAlB sample synthesized at 900 °C exhibits superior EMW absorption performance, achieving an impressive minimum reflection loss (RL) of −50.33 dB. The unique layered structure and good electrical conductivity of the MoAlB samples are the main reasons for their enhanced wave absorption performance, which provides interfacial polarization and multiple dielectric loss mechanisms. Therefore, this study not only contributes to the understanding of the preparation of MoAlB materials but also provides potential guidance for their utilization in the realm of electromagnetic wave absorption.


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Ternary layered boride MoAlB: A novel thermo-regulation microwave absorbing ceramic material

Show Author's information Zhangjue Wang1Fan Zhang1,2Nannan Wang3Wei Li4( )Yongqiang Chen1Hailong Wang1Rui Zhang1,5Yanqiu Zhu3,6Bingbing Fan1,6( )
School of Material Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
Henan Academy of Sciences, Zhengzhou 450046, China
State Key Laboratory of Featured Metal Materials and Life Cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt 64287, Germany
School of Material Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China
Department of Engineering, Faculty of Environment, Science and Economy, University of Exeter, Exeter EX4 4QF, UK

Abstract

In the context of the fifth-generation (5G) smart era, the demand for electromagnetic wave (EMW)-absorbing materials has become increasingly prominent, so it is necessary to explore promising candidate materials. This work focuses on the exploration of the material absorbing properties of a MoAlB MAB (MAB represents a promising group of alternatives, where M stands for a transition metal, A typically denotes Al, and B is boron) phase system. First, the first-principles calculations were performed to reveal the unique crystal and layered structure of the MoAlB ceramics and to predict their potential for use as an EMW absorption material. Subsequently, a series of MoAlB ceramics were synthesized at temperatures ranging from 800 to 1300 °C, and the influence of temperature on the phase compositions and microstructures of the obtained MoAlB ceramics was characterized and analyzed. Finally, the practical EMW absorption performance of the prepared MoAlB ceramics was evaluated via a combination of experiments and radar cross-sectional calculations. The MoAlB sample synthesized at 900 °C exhibits superior EMW absorption performance, achieving an impressive minimum reflection loss (RL) of −50.33 dB. The unique layered structure and good electrical conductivity of the MoAlB samples are the main reasons for their enhanced wave absorption performance, which provides interfacial polarization and multiple dielectric loss mechanisms. Therefore, this study not only contributes to the understanding of the preparation of MoAlB materials but also provides potential guidance for their utilization in the realm of electromagnetic wave absorption.

Keywords: electronic band structure, density of states, electromagnetic wave (EMW) absorption, MoAlB, layered ternary boride

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Publication history

Received: 18 January 2024
Revised: 30 March 2024
Accepted: 30 March 2024
Published: 28 May 2024
Issue date: May 2024

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© The Author(s) 2024.

Acknowledgements

Acknowledgements

This work was financially supported by the Joint Fund of R&D Program of Henan Province (No. 222301420002), the Outstanding Youth Fund of Henan Province (No. 242300421009), the National Natural Science Foundation of China (No. U21A2064), the Scientific and Technological Innovation Talents in Colleges and Universities in Henan Province (No. 22HASTIT001), and the Henan Province Key Research Project for Higher Education Institutions (No. 23B430017). Bingbing Fan thanks the China Scholarship Council (CSC, No. 202207045028) for an academic visitor scholarship, and Wei Li is grateful for the financial support from the Technical University of Darmstadt.

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