Magnetic and Structural Properties of SrFe12−xCrxO19 (x = 0, 0.25, 0.5, 0.75, 1) Hexaferrite Powders Obtained by Sol–Gel Auto-Combustion Method
The crystalline structure and magnetic properties of chromium substituted hexagonal strontium ferrite, SrFe12−xCrxO19 (x = 0, 0.25, 0.5, 0.75, 1), nanoparticles have been investigated by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and vibrating sample magnetometer (VSM). These materials were prepared by the chemical sol–gel auto-combustion method. From the structural analysis, it was observed that the non-magnetic phase α-Fe2O3 appears after x ≥ 0.5 and remains to be a hexagonal magnetoplumbite phase for x < 0.5. Various parameters such as lattice constants (a and c) were calculated from the XRD data. The coercively H c initially decreases and then increases with increasing chromium concentration. The saturation magnetization exhibits an increase as the chromium content increases up to (x = 0.25) and then decreases with increase in the Cr content ion from 75.19 to 61.66 emu/g due to the substitution of Fe3+ ions by less magnetic Cr3+ ions. Furthermore, M r continually decreases with increase in the Cr content.
KeywordsMagnetoplumbite Cr substitution Sol-gel method Magnetic properties Saturation magnetization
The authors would like to thank the “Iranian Nanotechnology Initiative Council” for their financial support.
- 4.Went, J.J., Ratheneau, G.W., Gorter, E.W., Van Oosterhout, G.W.: Ferroxdure, A class of new permanent magnet materials. Philips Tech. Rev. 13, 194–208 (1951)Google Scholar
- 8.Roohani, E., Arabi, H., Sarhaddi, R.: Influence of nickel substitution on crystal structure and magnetic properties of strontium ferrite preparation via sol-gel auto-combustion route. International Journal of Modern Physics B. https://doi.org/10.1142/S021797921750271X
- 22.Jauhar, S., Singh, J., Chandra, K., Bansal, S., Singhal, S.: Structural, morphological, magnetic and optical properties of chromium substituted strontium ferrites, SrCrxFe12−xO19 (x = 0.5, 1.0, 1.5, 2.0 and 2.5) annealed with potassium halides. Powder Technol. 212, 193–197 (2011)CrossRefGoogle Scholar