Nano-Al_2O_3 powders have been synthesized by a solution combustion method (SCS) using glycine as a fuel and ammonium nitrate as an extra oxidizer. The effectiveness and influence of oxidizer/fuel ratio and the water contetnt of the solution on the crystallite size and characteristics of alumina particles was investigated respectively. As-synthesized powders were γ-alumina due to calcination of samples at 900 C for 2 hours. Also, Results demonstrated that the alumina nanoparticles obtained from Φ=1.8 had crystallite sizes around 65 nm which is less than other values of Φ, due to evolution of larg amounts of gases which inhibits grain growth and less adiabatic temperature during the process. Also, it was concluded that the more the water content of the solution, the less the crystallinity and crystallite sizes of the products as a result of decreased adiacatic temperature.
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