Study on preparation of high purity barium titanate powder by sol-gel method
Barium titanate is widely used in the electronics industry and known as"the pillar of the electronic ceramic indus-try".The traditional sol-gel method mainly uses organic solvents and organometallic salts as raw materials to prepare barium titanate,which has problems such as high raw material cost and three wastes discharge.In this study,high purity barium nitrate was prepared by carbothermic reduction,hot water leaching,acidification and crystallization of barite from abundant barite ore in Guizhou province.High purity barium titanate powder was prepared by sol-gel method using water as solvent and barium nitrate and inorganic titanium salt as raw materials through hydrolysis,aging,evaporation,dehydration and roasting.The effect of sol-gel process conditions on the purity and crystal phase of barium titanate was focused,and a sol-gel method with water as solvent was obtained to prepare high purity barium titanate.Under the optimum conditions of material ratio n(barium nitrate)∶n(barium nitrate)∶n(citric acid)=1∶1.01∶2,roasting temperature of 1 100 ℃ and roasting time of 180 min,the high purity Barium titanate powder was prepared as tetraneous crystal phase with principal component content of 99.85％.The quality met the requirements of HG/T 3587-2009"high purity barium titanate for electronic indus-try".This study provided theoretical and feasible guidance for the high value utilization of barite.
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