Preparation of Mixed Phase Strontium Ferrite Nanoparticles and Effect on Magnetic Properties

2012 Vol 13

Preparation of Mixed Phase Strontium Ferrite Nanoparticles and Effect on Magnetic Properties

Rakesh Kumar Singh1, Amarendra Narayan2, R. N. Roy3 and Avinash C. Pandey4

1 Department of Physics, Patna Women’s College, Patna University, Patna, Bihar, India

2Department of Physics, Patna University, Patna, Bihar, India

3 Department of Physics, Samta College, Jandaha, Vaishali, Bihar, India

4Nanotechnology Application Centre, University of Allahabad, Uttar Pradesh, India

ABSTRACT Pure phase and mixed phase strontium ferrite powder were prepared using citrate precursor method. The annealing temperature for both samples was 450oC. The samples were structurally characterized using X- Ray diffractometer (XRD) and magnetically characterized using Vibrating sample magnetometer (VSM). The particle size was observed 15 nm and 8nm at same annealing temperature 450oC. Some additional phase appears in addition to hexaferrite. The retentivity and magnetization was found 3.321 emu/g, 36.615 emu/g for pur phase sample while 0.64 emu/g and 33.332 emu/g for mixed phase sample respectively. This behaviour suggests that non-stoichiometric preparation as a possible route for engineering preparation of samples for a particular set of magnetic parameter values. In these samples we observed a change in retentivity that seemed independent of magnetization.

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