Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Effect of Sintering Temperature on the Micro Strain and Magnetic Properties of Ni-Zn Nanoferrites

  • Venkatesh, D. (Center for Materials Research, Department of Physics, GIT, GITAM University) ;
  • Siva Ram Prasad, M. (Department of Physics, M.V.G.R College of Engineering) ;
  • Rajesh Babu, B. (Department of Physics, GVP College of Engineering for Women) ;
  • Ramesh, K.V. (Center for Materials Research, Department of Physics, GIT, GITAM University) ;
  • Trinath, K. (Naval Science and Technological Laboratory, DRDO)
  • Received : 2015.01.24
  • Accepted : 2015.06.12
  • Published : 2015.09.30
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Abstract

In this study, nanocrystalline ferrite powders with the composition $Ni_{0.5}Zn_{0.5}Fe_2O_4$ were prepared by the autocombustion method. The obtained powders were sintered at $800^{\circ}C$, $900^{\circ}C$ and $1,000^{\circ}C$ for 4 h in air atmosphere. The as-prepared and the sintered powders were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and magnetization studies. An increase in the crystallite size and a slight decrease in the lattice constant with sintering temperature were observed, whereas microstrain was observed to be negative for all the samples. Two significant absorption bands in the wave number range of the $400cm^{-1}$ to $600cm^{-1}$ have been observed in the FT-IR spectra for all samples which is the distinctive feature of the spinel ferrites. The force constants were found to vary with sintering temperature, suggesting a cation redistribution and modification in the unit cell of the spinel. The M-H loops indicate smaller coercivity, which is the typical nature of the soft ferrites. The observed variation in the saturation magnetization and coercivity with sintering temperature has been attributed to the role of surface, inhomogeneous cation distribution, and increase in the crystallite size.

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References

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