Effect of Ti4+ ions on the magnetic and dielectric properties of Mg-ferrite

Abstract X-ray diffraction, the real part ( e ′), the imaginary part ( e″ ) of dielectric constant, and the molar magnetic susceptibility ( χ M ) for Mg 1+ x Ti x Fe 2−2 x O 4 ferrite (0.1⩽ x ⩽0.9) were studied. The date of X-ray diffraction showed that the unit cell parameter increases with Ti concentration and ascribed to the predicted variation of the cation distribution, while Mg 2+ ions are highly diffusible and very sensitive to heat. The effect of dilution by Ti ions is discussed in terms of increasing superparamagnetic and single domain (SP/SD) grains. The measurements of e′ were performed at different temperatures as a function of frequency, while the magnetic susceptibility was studied at different magnetic field intensities. The variation of the dielectric properties depends mainly on the valence exchange between the different metal ions in the same site or in different sites. All parameters such as e′ , e″ , χ M showed a decrease in value with increasing Ti and Mg concentration. The dispersion in e′ with frequency disappeared gradually with increasing Ti concentration.