Enhanced Microwave Absorption of Multi-Interface Core-Shell FeSiAl@MnO_x@C Composites by Morphology Engineering

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Optimizing microwave absorption relies on tailoring material properties like interfaces, composition, and morphology.
• Thermal treatment is key to controlling crystal phase, microstructure, and electromagnetic characteristics.
• Synergistic effects from heterogeneous interfaces, magnetic components, microstructures, and defects enhance impedance matching and losses.

Purpose of the Study:

• To develop and evaluate multi-interface core-shell FeSiAl@MnOₓ@C composites for superior microwave absorption.
• To investigate the influence of morphology on microwave absorption performance.
• To understand the mechanisms behind enhanced microwave absorption.

Main Methods:

• Synthesis of FeSiAl@MnOₓ@C core-shell composites with controlled morphologies.
• Characterization of material structure and electromagnetic properties.
• Evaluation of microwave absorption performance, including reflection loss and effective absorption bandwidth.

Main Results:

• Achieved a minimum reflection loss of -56.3 dB at 1.41 mm thickness.
• Obtained an effective absorption bandwidth of 5.0 GHz at 1.59 mm thickness.
• Demonstrated significant radar cross-section reduction (19.448 at 0° incidence).

Conclusions:

• The FeSiAl@MnOₓ@C composites exhibit outstanding microwave absorption capabilities.
• Synergistic magnetic and dielectric losses, coupled with improved impedance matching, drive the enhanced performance.
• This work provides a basis for designing next-generation microwave-absorbing materials with strong magnetic loss properties.