Activating Basal Plane Inert Sites of Iron Telluride for Motivational Electromagnetic Microwave Absorption

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Transition metal tellurides (TMTs) show limited electromagnetic microwave (EMW) absorption due to inert basal plane sites and poor dielectric relaxation.
• Overcoming these limitations is crucial for developing advanced microwave absorbing materials.

Purpose of the Study:

• To establish an effective dual defect model in iron telluride (FeTe) flakes to enhance EMW absorption performance.
• To elucidate the dielectric relaxation loss mechanisms in defect-engineered TMTs.

Main Methods:

• Fabrication of dual-defect FeTe flakes using a one-step O2 plasma treatment.
• Characterization of defect-induced changes in polarization centers and dipole site density.
• Evaluation of EMW absorption performance, including reflection loss and absorption bandwidth.

Main Results:

• Optimized dielectric relaxation loss achieved through Te vacancies and O incorporation, activating basal plane sites.
• Optimal EMW absorption performance with a minimum reflection loss of -69.6 dB at 2.2 mm thickness.
• Broad absorption bandwidth of 4.9 GHz at 1.3 mm thickness and significant radar cross-section reduction (42 dBsm).

Conclusions:

• The dual defect model effectively enhances dielectric relaxation loss and EMW absorption in FeTe.
• This study provides a feasible strategy for designing high-performance TMTs-based microwave absorbers.