Abstract

In the last decade, spinel structures have been widely explored due to widespread applications in antibacterial nanocomposites, memory devices, catalysts, photocatalysts, high-frequency devices, and electromagnetic absorbing materials. In this study, BaFe2O4 spinel structures were synthesized through the sol–gel method using a low sintering temperature and were identified by vibrating sample magnetometer (VSM), X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FE-SEM), and vector network analyzer (VNA) analysis. Results showed that uniform and pure crystal structures of BaFe2O4 nanoparticles were prepared based on the sol–gel method. Finally, BaFe2O4 nanoparticles were blended by silicone rubber to characterize the microwave absorption properties of the nanocomposite at the ku-band frequency. According to the VNA results, the BaFe2O4/silicone rubber nanocomposite with 1.75 mm thickness absorbed more than 94.38% of microwave irradiation along the ku-band frequency and the maximum reflection loss of the BaFe2O4/silicone rubber nanocomposite was 51.67 dB at 16.1 GHz.

Highlights

  • The magnetic materials of normal spinel ferrites with the general chemical formula MFe2O4 have various applications owing to a type of M cation, for which M is the divalent metal cation (M2+ = Ba2+, Sr2+, Co2+, Mg2+, Zn2+, Cu2+, Mn2+, etc.)

  • The pattern of BaFe2O4 calcined at 650 °C exhibits that all the obtained peaks correspond with the JCPDS number [00-046-0113]

  • The obtained results demonstrate that BaFe2O4 nanoparticles were prepared through the sol–gel method using a low sintering temperature, which confirms that the heat treatment had a significant effect on the crystal purity of the nanostructures

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Summary

Introduction

The magnetic materials of normal spinel ferrites with the general chemical formula MFe2O4 have various applications owing to a type of M cation, for which M is the divalent metal cation (M2+ = Ba2+, Sr2+, Co2+, Mg2+, Zn2+, Cu2+, Mn2+, etc.). The intrinsic properties of BaFe2O4 nanoparticles, such as high magnetic saturation and coercivity, high chemical and mechanical resistance, and high curie temperature, have indicated that it as a good candidate for microwave devices, radar-absorbent materials, permanent magnets, drug deliveries, photocatalytic catalysts, credit cards, etc. The methods of synthesizing spinel ferrites greatly affect their properties and applications. The crystallinity, size, and shape of the nanostructures are the most influential factors on the properties of nanomaterials [4]. A single phase of ferrite nanoparticles was prepared by the sol–gel method with a low sintering temperature. The microwave absorption of the BaFe2O4 nanoparticles was investigated using a silicone rubber polymeric matrix

Materials and Instruments
Synthesis of BaFe2O4 Nanoparticles
Phase Identification Analysis
FTIR Spectroscopy
Magnetic Properties
Microwave Absorption Properties
Conclusions

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