Studying the Structure, the Electric and Magnetic Properties of Ni-Zn Ferrites.

The two types of ferrites have been prepared using co-precipitation technique (Ni0.6 Zn0.4 Fe2O4 and Ni0.4 Zn0.6 Fe2O4). The prepared ferrites were sintered at 800C˚. Four samples halve of these as pressed pellets (12.3mm diameter, 5-4mm thickness) and later halve as triodes (Rin=9.85mm, Rout=19.4mm). All of them were sintered at (1100 C) for (2 hrs.). (X-ray diffraction (XRD) technique was used to study the structure and the scanning electron microscope also was used to determine the grain size. The electrical characteristics for these samples including measure the real and imaginary parts of dielectric constant (ε_r and ε_i which used to determine the loss factor (tanδ) over the frequency range (20Hz - 3MHz). From the values of loss factor, the quality factor could be obtained. Also the electrical resistivity was calculated over the same range of the frequencies. The magnetic properties were measured using the same equipment, such as the initial permeability (?_i) after measuring the inductors (L) and the inductor factor (A_L) also was calculated.