[中文文摘]以AlCl_3·6H_2O为原料,用溶胶—凝胶法制备出Al(OH))3凝胶,反复多次冷冻离心脱水,1180℃煅烧得到纳米级α-Al_2O_3,用x射线粉末衍射(XRD)、透射电镜(TEM)、比表面测定(BET)对产品进行表征,证明产品直径为93nm,并讨论了其原理。[英文文摘]α-Al_2O_3 nanopowder was synthesized by baking the colloid of A1(OH)_3 at 1180℃ after it dehydrated by means of multi-freeze and centrifugal. Using A1_2O_3·6H_2O as raw materials, colloid of Al (OH)_3 was prepared by colloidal chemistry method. The structure and characteristic of the powder were studied by means of XRD, BET and TEM, it was revealed that the average size of α-Al_2O_3 is about 90nm. The formation mechanism of colloid was discussed
