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Effect of Li content on electromagnetic shielding effectiveness in binary Mg–Li alloys: a combined experimental and first-principles study

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Abstract

The electrical conductivity and electromagnetic interference (EMI) shielding effectiveness (SE) of the as-cast Mg–xLi (x = 4, 8, 12 wt%) are investigated by combining experiments and first-principles study. The experimental results show that the increase of Li content leads to the increase of the interference of solute atoms to the movement of free electrons, which reduces the electrical conductivity of Mg–Li alloy. The Mg–4Li alloy has the optimal electrical conductivity with a value of 8.2 MS/m. The calculated densities of states (DOS) show that α-Mg has the highest structural stability and electrical conductivity, which agrees well with the results of the experiments. The Mg–8Li alloy has better EMI SE at 600–1500 MHz, which is mainly due to the increase in absorption loss caused by the multiple reflections of electromagnetic (EM) waves by the α-Mg/β-Li dual-phase structure with different impedance relationships. The electronic charge density distribution of the α-Mg(0001)//β-Li(0 \({\overline{\text{1}}}\) 1)//α-Mg(0001) layer also confirms this.

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Acknowledgements

This paper was supported by National Natural Science Foundation of China (51871068, 51771060, 51971071, 52011530025), National Key Research and Development Program of China (2021YFE0103200), Fundamental Research Funds for the Central Universities (3072020CFT1006), Domain Foundation of Equipment Advance Research of 13th Five-year Plan (61409220118), the Fundamental Research Funds for the Heilongjiang Universities (2020-KYYWF-0532), Ph.D. Student Research and Innovation Fund of the Fundamental Research Funds for the Central Universities (3072021GIP1002), Zhejiang Province Key Research and Development Plan (2021C01086).

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Authors and Affiliations

  1. Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin, 150001, China

    Jiahao Wang, Chunlin Du, Ruizhi Wu, Lin Xu, Jing Feng, Jinghuai Zhang, Legan Hou & Bin Liu

  2. College of Science, Heihe University, Heihe, 164300, China

    Ruizhi Wu

  3. Department of Environmental Engineering, Heilongjiang University of Technology, Jixi, 158100, China

    Meiduo Liu

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  1. Jiahao Wang
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Contributions

JW: Investigation, Materials processing and characterization, Data curation and writing original draft. CD and LX: Methodology, Formal analysis. RW: Conceptualization, Methodology, Project administration and revising original draft. JF, JZ and ML: Analyzing and discussing data. BL: Revising the manuscript and replying to the review comments. LH: Supervision.

Corresponding authors

Correspondence to Ruizhi Wu or Bin Liu.

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Wang, J., Du, C., Wu, R. et al. Effect of Li content on electromagnetic shielding effectiveness in binary Mg–Li alloys: a combined experimental and first-principles study. J Mater Sci: Mater Electron 33, 3891–3900 (2022). https://doi.org/10.1007/s10854-021-07580-0

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