Аңдатпа
Strontium hexaferrite with a high degree of iron substitution by chromium (SrFe12-xCrx O19, at x = 6.5 - 7.5 with a step of x(Cr) = 0.5) was obtained by solid - phase synthesis at an isothermal exposure temperature of 1500°C. Analysis of the results of XRD X - ray diffraction and scanning electron microscopy (SEM) confirmed the formation of single - phase hexagonal M - type ferrites upon substitution with Cr ions from x = 6.5 to x = 7.5. Previously, using the same method at a temperature of 1400°C, we synthesized and obtained the results of X - ray, morphology, elemental analyses and magnetic properties for single-phase samples of SrFe12-xCrxO19 with x = 0 - 6 [1]. This article studies the effect of doping with Cr 3+ ions on the structural and functional properties of hexaferrite SrFe12-x CrxO19 x = 0 - 7.5. The temperature and frequency dependences of the initial magnetic permeability of the obtained ferrites have been studied. It was found that the substitution of iron with chromium leads to a decrease in the Curie temperature. Studies of the electrical properties of the obtained materials were carried out in the frequency range of 25 Hz - 3 MHz at room temperature. An analysis of the dielectric properties showed that an increase in the content of Cr3+ ions in SrFe12-xCrxO19 leads to a decrease in the dielectric constant, dielectric losses, the tangent of the dielectric loss angle and an increase in the complex resistance. The results of the study demonstrate the dependence of electrical properties on the frequency of the applied field and the concentration of dopant.