Method for preparing rare earth-doped yag nano-powder by partial liquid phase precipitation method

The invention relates to a method for preparing a rare earth doped yttrium aluminum garnet nanometer powder body by a partial liquid phase precipitation method. Y(NO3)3 and Al2O3 are used to synthesize the yttrium aluminum garnet nanometer powder body; and Nd, Yb, Cr and other rare earth elements are used for ion doping. Ammonium oxalate, NH4HCO3 or urea is adopted as a precipitant. Sediment is aged, fully washed, dried and calcined for 15 to 120 minutes at a temperature of between 1000 and 1600 DEG C under the aerobic condition, thereby acquiring the rare earth doped YAG powder body with a grain diameter between 80 to 200 nm. The method can realize the uniform doping of the rare earth elements, also avoid forming a colloidal substance which is unfavorable for washing, and prepare the rare earth doped YAG nanometer powder body material in high efficiency.