单一板钛矿相TiO_2微晶的制备

Preparation of Brookite TiO_2 Micro-crystals with Single Phase

以新鲜的无定形 Ti O2 沉淀为前驱体 ,在水热条件下得到了板钛矿型 Ti O2 微晶粉末 ,考察了前驱体制备过程中碱的种类与用量以及水热反应的温度和时间等因素对板钛矿型 Ti O2 的影响 . XRD,TEM和Raman测试表明 ,所合成的样品具有单一的板钛矿型 Ti O2 结构 ,晶相纯度很高 ,晶粒形状相同且具有完美的内部结构 ,粒度分布均匀 .此板钛矿型 Ti O2 样品在 90 0℃时开始向金红石结构转化 ,1 0 0 0℃时完全转变为金红石结构 .

Fresh precipitates of amorphous TiO 2 were used as the precursor to prepare brookite phase titania powders by hydrothermal method. The powders were characterized by XRD, Raman and TEM. All the results showed that the synthesized titania powders contained only brookite with a high purity of phase and uniform crystal size. The transformation from brookite to rutile occured when the powders were calcined at 900 ℃ and was completed at 1 000 ℃.