Xie-Bin ZhuWANG Hai-tao;;;JIANG Tao
. 2011, 42(04): 35-0.
Abstract (
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ZAO precursors were prepared by a co-precipitation process with additive of PEG-6000 from zinc chloride, AlCl3?6H2O and ammonia solution in a water bath. ZAO powders were obtained upon calcinations. The phase structure, morphology, size and conductivity of ZAO powders were characterized by X-ray diffraction, scanning electron microscopy and digital conductivity instrument. The effects of the concentrations, pH value, reaction temperature, calcinations temperature and time on the conductivity properties of ZAO powders were discussed and the optimal technological parameters were attained. The results show that the ZAO samples are polycrystalline, well dispersed, rodlike, and the ratio of length to diameter reaches about 10, and correspond to hexagonal structure. the conductivity of ZAO samples increases with ammonia concentration increases, while decreases with pH value increases, increases and then decreases with increasing the reaction temperature or calcinations temperature and time. The optimum conductivity conditions of ZAO samples is the ammonia concentration of 1:0, pH=6, reaction temperature of 50℃, calcinations at 450℃ for 4h.