a Department of Physics, Government College University, Faisalabad, Pakistan

38000

b Plant Production Department, College of Food & Agriculture Sciences, King

Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia

c Electrical and Biological Physics, Kwangwoon University, Seoul 01897, South

Korea

In this study solgel auto-combustion technique was successfully implanted to synthesized Er-doped soft ferrites with the chemical formula Mg₀.2Mn₀.8Cr0.03Fe1.97-xErₓO₄ (MMCE ferrites). The required stoichiometric amounts of the chemicals, along with citric acid as a polymerization mediator, were calculated and used. The electrical and structural properties of Er-substituted Mg-Mn-Cr ferrite were characterized using various techniques. X-ray diffraction analysis confirmed that all samples exhibited a single-phase spinel structure with an Fd-3m space group, with X-ray density, lattice constant, and crystallite size varying based on Er concentration. Fourier Transform Infrared (FTIR) spectroscopy revealed stretching and cation vibrations of other groups in the wave number range of 250 cm_1 to l500 cm_1. Scanning electron microscope (SEM) images showed that the particles were agglomerated, forming larger, closely packed clusters. DC resistivity measurements indicated that the resistivity of the samples increased significantly, reaching l01⁰ Ω·m at the highest La concentration. Currently, rare-earth-substituted ferrite nanoparticles are widely used in high-frequency microwave devices due to their exceptional electrical properties, making ferrites highly valuable.