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Double perovskite oxides of Sr2Fe1-xInxMoO6 (x = 0.0, 0.1 and 0.4 wt. %.) were prepared by sol-gel growth followed by annealing under reducing atmosphere conditions of 10% H2/Ar flow. These samples were characterized by X-ray diffraction, Scanning Electron Microscopy and Electron Spin Resonance studies. High temperature thermal expansion studies were carried out using Netzsch 402PC dilatometer in the temperature range from 40 to 400°C. The coefficient of thermal expansion (α) was calculated at different temperature for all the samples. The value of α was found to increase with increase of temperature while average value of coefficient of thermal expansion found to decrease with indium composition in SFIMO materials.

Different compositions of double perovskite oxide powders of Ba2Fe1-xGaxMoO6 (x=0.0, 0.1, 0.25 and 0.3) were prepared by sol-gel method. These materials were subjected to X-ray diffraction studies to confirm the crystal structure. Magnetization studies were performed using VSM and saturation magnetization found to decreases by addition of Ga. Electrical resistivity data were collected while varying magnetic field from 0 to 80 kOe keeping temperature constant at 150 K by four-probe method. Resistivity studies were also performed by varying temperature from 5 to 300 K keeping magnetic field constant at 0 and 80 kOe. Magneto resistance (MR%) was calculated using resistivity data. The MR (%) was found to increase with increase of Ga concentration in BFGMO compounds.