Employing HNO_3,NH_3·H_2O,NH_4NO_3,H_2C_2O_4 and commercial available Y_2O_3 as starting materials,and using SDBS as surfactant and PEG2000 as assistant,the precursor Y( NH_4)( C_2O_4)_2·H_2O and its final products Y_2O_3 powders were successfully fabricated by the improved oxalate precipitation method and subsequent calcination treatment. In this specific route,a little amount of designed Y( NO_3)_3solution was added into a certain huge volume of NH_3·H_2O-NH_4NO_3 mixed solution to create Y( OH)_3hydro-ge...