Effect of TiO2 on electrical and magnetic properties of Ni0.35Cu0.12Zn0.35Fe2O4 synthesized by the microwave–hydrothermal method

• The addition of TiO2 to NCZ improved the density of the composites.
• The addition of TiO2 to NiCuZn ferrite can enhance the dielectric and magnetic properties at 1 MHz.
• These composites are frequency stable upto 1 GHz and the resonant frequency is above 1 GHz.
• Therefore, these composites are useful materials for EMI applications upto 1 GHz.

The nanocomposites of xTiO2+(1−x)Ni0.53Cu0.12Zn0.35Fe2O4 (where 0≤x≥1) were prepared using microwave–hydrothermal (M–H) method at 165 °C/45 min. The as-synthesized powders were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). The particle size of the powder varies from 18 to 35 nm. The as prepared powders were densified at 500 °C/30 min using microwave sintering method. The sintered composites were characterized by XRD and scanning electron microscopy (SEM). The bulk densities of the present composites were increasing with the addition of TiO2. The grain sizes of all the composite vary between 65 nm and 90 nm. The addition of TiO2 to ferrite increased the dielectric properties (ε′ and ε″) also the resonant frequency of all the composites was found to be greater than 1 GHz. The imaginary part of permeability (μ″) was found to increase with an increase of TiO2.

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