Zinc oxide (ZnO) and zinc ferrite (ZnFe 2 O 4 ) powders are synthesized using a sol-gel combustion method. The synthesized powders' crystal structure and microstructure are studied using X-ray diffraction (XRD), Fourier transformation spectroscopy (FTIR), and a field effective scanning electron microscopy (FESEM). XRD studies confirm the presence of nanocrystalline hexagonal wurtzite structure for ZnO and spinel phases for ZnFe 2 O 4 . The average crystallite size of the powders measured from XRD patterns is 16 nm for ZnO and 10 nm for ZnFe 2 O 4 , respectively. The composite samples of (x) ZnO + (1-x) ZnFe 2 O 4 (where 0 ≤ x≤ 1) are prepared by high energy ball milling and sintered at 900°C in a microwave furnace. The prepared composite samples are characterized using X-ray diffraction, UV-visible spectroscopy, and scanning electron microscope (SEM). The grain size of all composite samples ranges from 74 to 132 nm. The room temperature complex permittivity (ɛ' & 𝝐 ″″ ) of composite samples is measured in the frequency range of 1 MHz-1.8 GHz.

Ni 0.53 Cu 0.12 Zn 0.35 Fe 2 O 4 ferrite powder is synthesized using the microwave-assisted hydrothermal (M-H) technique. The synthesized powder is characterized using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The morphology of the powder particles is examined using field effective scanning electron microscopy (FESEM). The powder is then sintered using microwave and conventional methods at 910°C/1.5 h and 910°C/4 h, respectively. The grain size, bulk density, d.c. resistivity, and saturation magnetization of both the sintered samples are measured and compared. The dielectric properties of both the sintered samples are measured at frequencies ranging from 1 MHz to 1.8 GHz. The research indicates that the sintering process has an impact on the magnetodielectric performance of ferrites. The change in properties resulting by the sintering method is briefly reviewed.