Novel magnetic silicate composite for lightweight and efficient electromagnetic wave absorption

A series of silicates with double shell hollow sphere morphology were prepared by hydrothermal method with ultra-high temperature calcined, and used in the field of electromagnetic (EM) wave absorption. By characterizing the chemical composition, crystal structure, micro morphology and EM parameters of the several materials, the evaluation results of EM wave absorption capacity of the materials were obtained. In the discussion section, we will discuss the reasons for the differences in EM wave absorption capabilities of the several silicates from multiple aspects such as EM wave absorption mechanism in detail. Especially for iron-based silicate (HGMs@Fe2SiO4) materials, after reasonable composition and morphology design, the minimum reflection loss (RLmin) reached up to -41.14 dB with a matching thickness (d) of 3.4 mm, and the corresponding effective absorption bandwidth (f(E), RL < - 10 dB) was 6.80 GHz. Because of the wide EM wave absorption bandwidth, light weight and low water absorption, this kind of double shell silicate material has gained huge application potential in the EM wave absorption field. (C) 2021 Published by Elsevier Ltd on behalf of Chinese Society for Metals.

Automated summary

Silicates with double shell hollow sphere morphology were prepared using ultra-high temperature calcination and hydrothermal methods, and applied in electromagnetic wave absorption. The iron-based silicate materials showed excellent electromagnetic wave absorption performance with a wide absorption bandwidth, making them promising for various applications in this field.