Electronic Properties of Alumxna/Titania Mixed Oxides and Interfacial Surface Models: a Theoretical Analysis

Abstract

Alumina is a common contaminate of titania, which is found in paints and food additives. Recently, thin films of rutile TiO2 grown on sapphire (α-Alumina) have received attention for possible use in electronic and optical devices.1−3 However, the alumina-titania interface has not been well characterized. In this work we report an extensive analysis of the alumina-titania interfacial relationship. Using existing structural data4, models of common alumina and titania surfaces have been constructed. The model used maximizes the commensurability between the two structures. Semi-empirical/tight binding calculations have been employed to examine the monolayer as well as the interfacial electronic properties in terms of chemical interaction potential and stability.

Ultrafine grained bulk ceramic composites consolidated from nanostructured composite powders by pressure less sintering

“…1 Al 2 O 3 -TiO 2 ceramic composite can be a good material for the femoral head of total hip joint replacement as well as many other applications. [2][3][4][5] Ultrafine grained alumina based ceramics demonstrate novel and attractive properties comparing with their coarse grained counterparts (microsized grain ceramics). 6,7 However, it is difficult to get a fully dense ceramic while maintaining an ultrafine grain size.…”