A Universal Laser-Driven Controllable Synthesis Methodology Enabling Electromagnetic Absorption in High-Entropy...

Area of Science:

• Materials Science
• Nanotechnology
• Solid State Chemistry

Background:

• High-entropy rare-earth oxides (HEREOs) are crucial for integrated structural and functional applications.
• Achieving electromagnetic absorption functionality in HEREOs is a significant challenge.

Purpose of the Study:

• To develop a controllable synthesis technique for HEREOs with electromagnetic absorption properties.
• To synthesize and characterize novel polymorphs of high-entropy rare-earth disilicates (HEREDs).

Main Methods:

• Laser-driven controllable synthesis (LDCS) technique.
• Synthesis of diverse HEREO families, including monosilicates, hafnates, zirconates, tantalates, niobates, and aluminates.
• Characterization of electromagnetic wave absorption properties.

Main Results:

• Successful synthesis of all HERED polymorphs, including unreported δ-, F-, and G-type phases with up to 20 elements.
• A G-type 20-cation HERED exhibited exceptional electromagnetic wave absorption, broadening the bandwidth from 0.01 to 5.26 GHz.
• Enhanced absorption attributed to laser-induced oxygen vacancies and intensified nanointerface polarization loss.

Conclusions:

• The LDCS technique is a versatile method for creating HEREOs with tunable electromagnetic absorption.
• These materials show potential as radar stealth and thermal/environmental barrier coatings for aircraft engine components.
• The study opens new avenues for designing advanced functional materials based on high-entropy oxides.