A series of (Ag0.9Li0.1)(Nb1-yTay)O3 ceramic powders were prepared by an aque-chemical method. The optimized calcination temperature, time and crystal lattice were studied by TG-DTA, IR, XRD and TEM. The results show that the optimized conditions were calcination of the precursor at 800 ℃ for 2 h. The ceramic powder thus prepared was rhombohedral with the average grain size of 48 nm.
The particulate hydrous oxides of rare-earth RExOy· nH2O(RE=Ce,Nd,La,Pr)have been prepared using polyacrylonitrile as adhesive agent. They showed better fluorideremoving property. The adsorption mechanism in relation with the pH value and temperatureof the solution have been discussed briefly.
