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International Journal of New Technology and Research

Impact Factor 3.953

(An ISO 9001:2008 Certified Online Journal)
India | Germany | France | Japan

Effect of Gamma Radiation on Super paramagnetic Nano-Particles

( Volume 3 Issue 1,January 2017 ) OPEN ACCESS

Nguyen Thi Ai Thu


Background: Nanosized spinel ferrite particles, a kind of soft magnetic materials with structure formula of  MFe2O4 (M = divalent metal ion, eg. Mn, Mg, Zn, Ni, Co, Cu, etc.), are one of the most attracting class of materials due to their interesting and important properties such as low melting point, high specific heating, large expansion coefficient, low saturation magnetic moment and low magnetic transition temperature, etc [1], [2]. Because of these properties, the spinel ferrites have many technical applications such as in photoelectric device [3], catalysis [4], sensors [5], nano devices [6], microwave devices [7], [8] and magnetic pigments [9].

In this work, the synthesis of Fe3O4, NiFe2O4, MgFe2O4 nano-particles by coprecipitation method is reported. The influence of gamma radiation on magnetic properties of these superparamagnetic nano-particles is examined.

Methods: The samples were prepared  by coprecipitation route. The X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Vibrating Sample Magnetometer (VSM) were used to characterized the samples. In this study, we used 60Co gamma radiation to emit on superparamagnetic materials.

Results: The result of XRD showed that the products were pure Fe3O4, NiFe2O4, MgFe2O4 particles. The hysteresis loop obtained from VSM measurements showed Fe3O4, NiFe2O4, MgFe2O4 superparamagnetic nanoparticles have an inverse spinel structure. From the SEM micrographs, it is proved that the nanoparticles obtained are cube like and rather uniform. The average particle size was changed under affecting of radiating and found to be in the range of 52 ¸ 54 nm that increased up to 48.6 ¸ 112% of 52 ¸ 54 nm that increased up to 48.6 ¸ 112%.

Conclusions: Nanosized ferrite particles were synthesized with coprecipitation route and were irradiated by 60Co gamma radiation source. The result showed that magnetic properties and particles size changed.  

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