Structure transition of nano-titania during calcination

来源期刊：中南大学学报(英文版)2003年第4期

论文作者：李国华 王大伟 徐铸德 陈卫祥

文章页码：275 - 279

Key words：nano-titania; phase transformation; structure transition; inter-planar distances

Abstract: In order to study the structure transition during calcination, nano-titania powders prepared by hydrolyzing precipitation approach and calcined at 300, 400, 500, 600 and 700℃were characterized by XRD, TEM and electron diffraction(ED), respectively. The results show that titania powders calcined below 500℃are almost composed of anatase, rutile appears below 500℃and its ratio increases gradually with increase of calcin temperature; nano-titania particles are smaller than 40 nm mostly and the dispersion is related to calcining temperature; the inter-planar distances of nano-anatase single crystalline change gradually when calcing temperature increases to 500℃; so do that of nano-rutile single crystalline when calcining temperature charges from 600 to 700℃. The conclusions can be drawn that the temperature of transformation from anatase to rutile is below 500℃and the process carries on gradually. Both inter-planar distances and the structure of nano-titania transform gradually with increasing calcing temperature.