Synthesis, characterization, conductivity, magnetic and magnetoresistance studies of Sr2Fe1-xInxMoO6 (x=0.0 and 0.2) double perovskite

Double perovskite materials Sr2Fe1 - xInxMoO6 (x = 0.0 and 0.2) were synthesized by sol-gel process. The materials were analyzed by X-ray diffraction and it is found that perovskite material crystallized in tetragonal structure, with space group I4/mmm. Variation of porosity and grain size behavior of samples has been studied by scanning electron microscopy. The spectra from energy dispersive X-ray spectroscopy showed that all the elements Sr, Fe, In, Mo and O are present in the samples and there are no impurities in the materials. Fourier transform infrared spectroscopy spectral analysis of present samples produced three characteristic absorption bands of Mo-O and Fe-O vibrations in the wave number range 400-1000 cm(- 1) which confirmed the present material is double perovskite phase. From electron spin resonance spectra, it is found that the value of g similar to 2.00 and indicates that Fe is in 3 + ionic state in these materials. It was found from conductivity results that conductivity of indium doped sample reduced when compared with parent compound Sr2FeMoO6. Indium doped sample showed semiconductor behavior whereas parent sample showed semiconductor-metallic behavior from 5 to 300 K. The electrical conductivity of the materials increases with increase of magnetic field at constant temperatures 5, 150 and 300 K. Magnetoresistance (%) of the present materials increases with magnetic field range from 0 to 4 T and decreases with temperature from 5 to 300 K. Magnetoresistance (%), saturation magnetization and transition temperature of indium doped material has lesser value compare to Sr2FeMoO6.