Abstract
In this article, erbium (Er) substituted lithium ferrite/carbon black composites are synthesized, and the effect of Er substitution on the morphological, structural, complex permeability, permittivity, and EMI shielding effectiveness of the composites are investigated. An enhancement in the lattice constant, saturation magnetization, and coercivity is observed with the initial concentration of the Er. Insertion of Er in place of Fe promoted 3d‒4f coupling, leading to variation in magnetic, dielectric, and conduction mechanisms. A prominent enhancement in the shielding effectiveness is obtained. Shielding effectiveness due to absorption played a significant role rather than reflection. Maximum saturation magnetization and total shielding effectiveness (SET) of 66 emu/g and 33.7 dB (@ 17.3 GHz) are obtained for LE6FO/CB. The permittivity and permeability also improved. The obtained results (saturation magnetization, permittivity, permeability, magnetic and dielectric loss) indicate that LE6FO/CB is a promising candidate for EMI shielding applications.
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