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Structural and Ferromagnetic Investigation of the Size Effects in Pure and Co Doped SnO2 Nano Particles

M. Saravanakumar, S. Agilan, N. Muthukumarasamy and V. Rukkumani

Structural, micro structural and magnetic properties of pure and Co doped SnO2 nano particles with different concentration (2%, 4% and 6%) have been studied. These nano particles synthesized by chemical precipitation method using cobalt nitrate hexahydrate Co(NO3)2·6H2O and tin chloride (SnCl2.2H2O), respectively. X-ray diffraction (XRD), high transmission transmission electron microscopy (HRTEM), room temperature magnetization measured using Vibrating Sample Magnetometer (VSM) were performed to study the crystal structure, morphology and magnetic properties of Co doped SnO2. The X-ray diffraction patterns show that all the specimen have tetragonal rutile structure without any extra phase. It reveals polycrystalline nature with prominent peaks along (110), (101), (200) and (211) planes. All the samples are nano crystalline with particle size lying in the range of 5-25 nm calculated by DS formula. HRTEM results depict the formation of spherically shaped and and particle size lies in range of 16-25 nm. SnO2 nano particles after doped Co show ferromagnetic behavior at room temperature the coercive field (Hc) values are found to be increased with increase in Co doping concentrations.