Nanocrystalline gadolinium-gallium garnet samples were fabricated via the sol-gel pechini method with citric and nitric acid for chelation and polyethylene-glycol for crosslinked. The influence of molar ratio [Gd]/[Ga] on the formation of the gadolinium-gallium garnet crystalline structure was examined. The development of nanocrystalline structure and phase composition of the powders was studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Thermogravimetric analysis (DTA/TG), and Fourier transform infrared spectroscopy (FT-IR). XRD patterns displayed that nano-sized and well-crystallized gadolinium-gallium garnet powders were fabricated at the annealing temperature as low as 800 °C for two hours. By applying the Scherrer formula and Pielaszek  method, the crystallite sizes of the samples are calculated, and grain size distribution is determined. Nanopowders show spherical bubble forms of thin spherical shells in the range of 400-500 nm, and the calculated size of the particles is about 20-50 nm

Keywords: Gadolinium gallium garnet, GGG, Sol-gel method, Optical materials, Nanopowder