  We report the synthesis of Co2FeGa/SiO2 nanoparticles by sol-gel method and
characterization using x-ray diffraction (XRD), transmission electron
microscopy (TEM) and magnetic measurements. The Rietveld refinements of XRD
data with space group Fm-3m clearly show the formation of A2 disorder single
phase and the lattice constant is found to be 5.738 {\AA}. The
energy-dispersive x-ray spectroscopy (EDX) confirm the elemental composition
close the desired values. The value of coercivity is found to be around 283 Oe
and 126 Oe, measured at 10 K and 300 K, respectively. We observed the
saturation magnetization significantly lower than expected from Slater-Pauling
rule. This decrease in the magnetic moment might be due to the presence of
amorphous SiO2 during the synthesis process. A large content of small size SiO2
particles along with Co2FeGa nanoparticles are also found in TEM study.
