SYNTHESIS AND MÖSSBAUER STUDIES ON NICKEL-ZINC-COPPER NANOFERRITES

Pathan A.N.¹, Kalyani Sangshetti², Pangal A.A.G.³*
¹Department of Physics, AUBHS&JC, Pune, 41100, India
²Singhaniya University, Rajasthan, 333515, India
³Department of Chemistry, AUBHS&JC, Pune, 411001, India
* Corresponding Author : amjadkhan777@gmail.com

Received : -     Accepted : -     Published : 15-06-2010
Volume : 1     Issue : 1       Pages : 13 - 16
Nanotechnol Nanosci 1.1 (2010):13-16

Conflict of Interest : None declared
Acknowledgements/Funding : The authors are thankful to Abeda Inamdar Senior College,Pune & Dept. of Physics,Singhaniya University, Rajasthan,India for extending the financial support to carry out low temperature/high field Mössbauer measurements

Polycrystalline Ni-Zn ferrite, with a well-defined composition, Ni0.6Zn0.4Fe2O4, synthesized by a low temperature method showed the formation of a cubic ferrite phase with a crystallite size of ~15 nm and saturation magnetization of Ms≈44 emu/g at room temperature. When calcined at higher temperatures (up to 1200 °C) the magnetization increased continuously to Ms≈67 emu/g. To understand the magnetic nature of the cubic ferrite phase formed at a temperature as low as 80°C, 57Fe Mössbauer spectra were recorded for samples annealed at three different temperatures, without any external magnetic field, and with an external field of Hext = 5 T, at 4.2 K. The spectral parameters at room temperature, namely, isomer shift, quadrupole splitting and hyperfine field, confirmed the presence of ultrafine superparamagnetic crystallites of Ni-Zn ferrite. The Mössbauer spectra at 4.2 K revealed spin relaxation effects resulting in very broad sextets, characteristic of ultrafine crystallites. The Mössbauer spectra recorded at 4.2 K and Hext=5T showed well-resolved two-sextet pattern with characteristic hyperfine interaction parameters of the cubic ferrite phase.

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