用特殊液相沉淀法制备掺锡钛酸钡纳米粉体

Preparation of nano BaTiO_3 doped with Sn powder by special liquid-phase precipitation method

依据反应胶粒析出机理及实验原理,采用高强度快速机械混合沉淀法,控制溶液pH,快速生成沉淀。用NH4OH,NH4HCO3清洗液过滤、洗涤。制备掺锡钛酸钡纳米粉体,当掺Ba(Ti0.9Sn0.1)O3时,该粉体室温介电常数最大,约是BaTiO3的8倍。经TEM和XRD表征,获得的掺锡钛酸钡纳米粉体粒径为48 nm,分散性良好。XRD表明适量掺锡进入钛酸钡晶格会引起居里点前移,并作了微观解释。

According to the precipitation mechanism of colloidal particle and experimental principle, the Ba（ Ti0.9Sn0. 1 ） O3 is precipitated from precusor solution by rapid mechanical mixing with high strength and controlling the proper pH value of solution. Then the precipitate is washed with NH4OH and NH4HCO3 solution and filtered. When the nano BaTiO3 powder doped with Sn as Ba（ Ti0.9Sn0. 1 ） O3,its dielectric constant at room temperature is maximum,which is about eight times of that of BaTiO3. Through the test by TEM and XRD, it is shown that the particle size of nano BaTiO3 doped with Sn powder is 48 nm with good dispersibility and the Curie point of the BaTiO3 crystal is moved ahead caused by proper amount of Sn doped. The microexplanation is given.