V_2O_3 nanocrystals prepared by mechanochemical-thermal reduction and their magnetic properties

摘要

V_2O_3 nanocrystals were synthesized in the Na_2SO_4 salt matrix through mechanochemical-thermal reduction between V_2O_5 and Na_2SO_3. The high-energy ball milling for 10 min followed by vacuum annealing even at 400℃ gives V_2O_3. V_2O_3 prepared at 550℃ with the crystallite size in the range of 25-60 nm shows a well-faceted morphology and exhibit the paramagnetic to antifferomagnetic transition at 144 K.