Anatase-to-rutile transformation in titania powders

Titania (TiO2) is an important electronic ceramic material for use in diver se applications such as gas sensors, catalysts, dielectrics, and ceramic me mbranes. TiO2 exists as several polymorphic phases, most commonly as rutile or anatase, This paper investigates the microstructural evolution of anata se-based commercial TiO2 powders, with an average size of 100 nm, at high t emperatures. These powders transform to the rutile structure at 1000 degree sC. The characteristics of the anatase-to-rutile transformation have been s tudied using transmission electron microscopy analysis, and new information regarding the nature and mechanisms of this polymorphic reaction has been revealed.