The effect of before and after removal of crystal water in starting material Lu(NO_3)_3·6 H_2 O and Al(NO_3)_3·9 H_2 O on synthesis of Lu_3 Al_5 O_(12)(LuAG) nanopowders by solvothermal method was investigated. As a comparison, the obtained powders were subsequently heated at 1 000 ℃ for 2 h. The phase composition, morphology and dispersion of the powders were analyzed by X-ray diffraction(XRD), fourier transform infrared spectroscopy(FTIR) and transmission electron microscopy(TEM). The results show that pu...