The Effects Of Cooling Mediums On The Morphology Of Barium Titanate Particles

In this paper,the B₂O₃·BaO·TiO₂ reaction systems with ratios of 3:5:2,3:3:2,2:1:1 were used to prepare BaTiO₃ through glass method.The obtained samples were analyzed by SEM,XRD,TEM,EDS,etc.Afterwards,the influence of various experimental conditions such as the ratio of reactants,cooling mediums and calcination temperature on products' morphology and sizes were discussed.The results show that,compared with the reactants ratio of 2:1:1,the reactants ratios of 3:5:2 and 3:3:2 are more applicable for the synthesis of BaTiO₃ while keeping other experimental conditions unchangeable.Then,samples prepared with the reactant ratio of 3:3:2 and calcination temperature of 1000? were studied.The results reveal that,by adopting different cooling mediums,the obtained samples present varied morphology: homogeneous cubes for air cooling;amorphous particles and a few nano spheres for oil cooling;amorphous particles and nano clusters for water cooling.Moreover,samples prepared with the reactant ratio of 3:3:2 and water as the cooling medium were investigated.It suggested that samples' sizes increase steadily with the rise of calcination temperature.Especially,by comparing the plate-shaped particles synthesized with calcination temperature of 800? and 900?separately,it can be seen that the later one show an obvious growth in thickness.Finally,with the purpose of preparing BaTiO₃ with more homogeneous morphology,a chemical-assisted glass method was tried.As a result,BaTiO₃ with stable cubic structure were obtained.Based on the DSC-TG data of reaction precursors by chemical-assisted glass method and glass method,it can be concluded that the reaction can be processed at a slightly lower temperature by chemical-assisted glass method.