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Structural and Magnetic Properties of Co(Cr1−y Al y )2O4 (y=0.0–0.2) Compounds

Abstract

We present the structural and magnetic properties of Co(Cr1−y Al y )2O4 compounds prepared by the sol-gel technique for y=0.00,0.025,0.05,0.075,0.10,0.15 and 0.20. It has been observed that non-magnetic Al+3 substitution for Cr+3 enhances the magnetization at low temperatures compared to that of the parent compound. With increase in Al concentration spiral magnetic transition observed at around 24 K becomes less prominent, without affecting the ferrimagnetic transition temperature at around 97 K. The saturation magnetization values after subtracting the paramagnetic contribution vary from 0.036 μB/f.u to 0.376 μB/f.u. The enhanced ferromagnetic interaction and resultant magnetization could be explained in terms of decrease in Cr+3–O–Cr+3 bond angle with increase in doping concentration.

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Acknowledgements

R.P. acknowledges Ulhas V. Vaidya for his help in the experiments and B. Samantaray, N.S. Sangeetha and S. Mohanty for their help in Rietveld refinement with the FULL PROFF program.

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Correspondence to D. Pal.

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Padam, R., Pal, D., Ravi, S. et al. Structural and Magnetic Properties of Co(Cr1−y Al y )2O4 (y=0.0–0.2) Compounds. J Supercond Nov Magn 26, 1607–1610 (2013). https://doi.org/10.1007/s10948-012-1924-3

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  • DOI: https://doi.org/10.1007/s10948-012-1924-3

Keywords

  • Spinels
  • Oxides and magnetism