Document Type : Original Article
Authors
1 Department of Physics Faculty of Science University of Sistan and Baluchestan, Zahedan
2 Department of Chemistry, University of Sistan and Baluchestan, Zahedan
Abstract
In this research, strontium hexaferrite nanoparticles were synthesized by sol-gel method. Gels were prepared from metal nitrates and citric acid with different Fe/Sr molar ratios and ammonia as pH adjuster. The phase, bond identification, composition, morphology, particle size and magnetic properties of the samples were studied using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM). The effect of annealing temperature (750, 850, 950 and 1050 °C) as well as the effect of Fe/Sr molar ratio on the crystal structure and magnetic properties of strontium hexaferrite were investigated. XRD shows the formation of M-type strontium hexaferrite phase at temperatures 950 and 1050 °C. Three vibrational modes were observed in the FT-IR spectrum of the annealed samples, indicating the presence of metal-oxygen tensile bonds in hexaferrite. Coercive field (2500-6000 Oe) was obtained under different conditions.
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