Preparation of Barium Strontium Titanate Powder with Controllable Morphology by High-Gravity and Hydrothermal Method
Zero-dimensional and multidimensional structures of barium strontium titanate(Ba1-xSrxTiO3,BST)powders have the advantages of high specific surface area and high aspect ratio,respectively.To improve the material properties,expand the industrial application of raw materials in electronic compo-nents and improve the uneven distribution and long time in the preparation process of powder,BST pow-der with glycerol were prepared by impinging stream-rotating packed bed(IS-RPB)combined hydrother-mal method.The effects of hydrothermal temperature,hydrothermal time and the amount of glycerol added to the morphology of BST powder were investigated.The morphology,crystal phase and composi-tion of BST powder were characterized by X-ray diffractometer(XRD),scanning electron microscope(SEM)and transmission electron microscope(TEM).The results show that under the conditions of supergravity factor of 40,initial impact velocity of 10.61 m/s,hydrothermal temperature of 180℃and hydrothermal time of 12 h,when a small amount of glycerol is added,it acts as a dispersant,and the BST powder is prepared as nano spherical particles with good uniformity and dispersion.When more glyc-erol is added,it acts as a solvent and grew along the unit crystal surface under hydrothermal conditions to obtain flake and flower-like morphology.In this paper,the high-gravity hydrothermal method and the addition of glycerol have explored a convenient and fast way for the preparation of BST powder with con-trollable morphology in industrial industry.
hydrothermal methodimpinging stream-rotating packed bedbarium strontium titanateglyc-erolmorphological control