Influence of microstructure on the complex permeability of spinel type Ni–Zn ferrite

Ni1−xZnxFe2O4 with x=0.2x=0.2 and 0.4 are prepared by a conventional solid-state reaction technique. Samples were sintered at various temperatures. Structural and surface morphology are studied by X-ray diffraction and optical microscopy. The magnetic properties of the ferrites were characterized with high-frequency (1 kHz–13 MHz) measurements. The Curie temperature of Ni0.8Zn0.2Fe2O4 is 516±1°C, while 353±1°C for Ni0.6Zn0.4Fe2O4. The relative quality factor for Ni0.6Zn0.4Fe2O4 sample sintered at 1250 °C is found maximum (2.1×1042.1×104). The effects of microstructure, composition and the sintering temperatures on the complex permeability of Ni–Zn ferrites are discussed.