Dielectric and magnetic properties of a yttrium ferrite/calcium copper titanate composite

ABSTRACTThis work presents a study on the dielectric and magnetic properties of the yttrium ferrite/calcium copper titanate composites. Their structural properties were analyzed by X-ray diffraction, density, and scanning electron microscopy. Impedance and microwave measurements were performed to obtain the permittivity of the composites at different frequencies. The dielectric constant, at 300 K and below 1 MHz, shows a value of about 4 × 103 and at 2.4 GHz a value of 32 was measured. The generalized Looyenga mixture law was used to describe the variation of dielectric constant with the filler volume fraction in low and high frequency regions. Magnetic measurements shows a relation of hysteresis loops based on the concentration of yttrium ferrite. A maximum of 37 emu/g for the saturation magnetization was obtain at 300 K.