Structural, dielectric, and magnetic properties of silver (Ag)-doped ferrite nanocomposites at different sintering temperatures

Silver-doped magnesium spinel ferrite (SMSF) nanoparticles were synthesized using the chemical co-precipitation method. X-ray diffraction analysis confirmed the presence of the cubic spinel structure in the silver-doped magnesium ferrite and the crystalline size ranged from 30.67 nm to 41.32 nm. The SEM analysis indicated well-defined nanocrystals, with the average particle size increasing as the sintering temperature was raised. Ag²⁺ ions substitution played a crucial role in promoting nanocrystalline formation. Additionally, UV-visible spectroscopy revealed the direct band gap energy of SMSF through Tauc plot analysis. Interestingly, as the sintering temperature increased, the crystallite size grew, the saturation magnetization decreased from 66.93 emu/gm to 50.05 emu/gm, and the coercivity increased from 125.12 Oe to 375.18 Oe. Furthermore, the SMSF responsed to the electrical field exhibited anomalous behaviour between 1 and 100 MHz frequencies. An unexpected shift occurred in the energy loss curve during relaxation peaks.

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