从不同种类的钛酸钾晶须(K2Ti6O13, K2Ti4O9和K2Ti8O17)出发, 通过水热条件下转晶得到了多形体TiO2晶粒, 其中K2Ti6O13晶须通过酸性条件下水热反应得到形貌规整的孪晶金红石TiO2. 并借助XRD、SEM和TEM等手段, 考察了水热反应过程中的晶体结构演变, 证明了前驱物中的弱结合晶面是发生晶体结构转变的关键因素, K2Ti6O13通过｛100｝和｛201｝晶面上的原子重排, 生成孪晶金红石型TiO2.
The hydrothermal synthesis of polymorphic titania crystals and their structural evolution from potassium titanates, K2Ti6O13, K2 Ti4O9 and K2Ti8O17 whiskers, were studied systematically. Dispersed, regular twinning rutile TiO2 was firstly generated by hydrothermally treating K2 Ti6O13 whisker in an acid medium. The crystal phase and morphologies varied with different reaction temperatures and time in diverse mediums were investigated using XRD, SEM and TEM. The results indicate that the weak-binding crystallographic planes are the key factors of the crystal transformation in the hydrothermal system. The transformation from K2 Ti6O13 to the twinning rutile is achieved via rearranging structural units on the {100} or{ 201} plane.
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