Abstract
A Y-type hexaferrite (Sr2Ni2Fe12O22) sample was synthesized using the sol–gel autocombustion and heat treated at different temperatures (800–1200 °C). Different experimental techniques such as differential thermal and thermo-gravimetric analyses, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and vibrating sample magnetometry were used to investigate the sample. The X-ray diffraction analysis shows that Y-type hexaferrite begins to appear at 1000 °C and the formation of pure Y-type hexaferrite phase gets completed at 1200 °C. IR spectrum for sample heat treated at 1200 °C further confirms that single phase sample of Y-type hexagonal ferrite can be prepared at this temperature. The highest values of coercivity and saturation magnetization were achieved at a temperature of 1000 °C due to the presence of M-type hexaferrite. Moreover single phase Y-type hexaferrite sample has a coercivity of a few hundred oersteds which is suitable for security, switching, sensing and high frequency applications.
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•Hexaferrite sample with composition Sr2Ni2Fe12O22 was synthesized by sol–gel method.•Effects of different heat treatment temperatures (800–1200 °C) were investigated.•Single phase Y-type hexaferrites was obtained at a temperature of 1200 °C.•The structural and magnetic properties of these samples were investigated.•The materials may be useful for security, switching and high frequency applications.