Extremely Polysubstituted Magnetic Material Based on Magnetoplumbite with a Hexagonal Structure: Synthesis,...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Magnetism

Background:

• Barium hexaferrite (BaFe ₁₂ O ₁₉ ) is a well-known magnetic material.
• High-entropy materials offer tunable properties through multi-element substitution.
• Exploring novel compositions is crucial for advanced applications.

Purpose of the Study:

• To synthesize and characterize a new high-entropy single-phase material with a magnetoplumbite structure.
• To investigate the effects of polysubstitution on structural and electrodynamic properties.
• To compare the new material with pure barium hexaferrite.

Main Methods:

• Solid-state sintering at temperatures up to 1400 °C.
• Morphological, chemical, and crystallographic analysis (EDX, XRD).
• Electrodynamic measurements (dielectric and magnetic permeability, losses) from 2 to 12 GHz.

Main Results:

• A single-phase magnetoplumbite product, Ba(Fe ₆ Ga _1.25 In _1.17 Ti _1.21 Cr _1.22 Co _1.15 )O ₁₉ , was successfully synthesized.
• Increased unit cell parameters (a = 5.9253(5) Å, c = 23.5257(22) Å) were observed due to ionic radius differences.
• Stable dielectric and magnetic permeabilities with low losses (-0.2/0.2) in the 2-12 GHz range.

Conclusions:

• The synthesized high-entropy material demonstrates promising electrodynamic properties.
• The material's stable performance in the microwave frequency range suggests potential applications.
• This work expands the possibilities for designing advanced microwave strip devices using novel magnetic materials.