Inhibiting effect of AlPO₄ and SiO₂ on the anatase → rutile transformation reaction: An x-ray and laser Raman study

The anatase → rutile transformation reaction of TiO₂ prepared in contact with amorphous aluminum phosphate and with fume silica has been investigated as a function of temperature by x-ray diffraction methods. It is observed that the anatase → rutile transformation in such systems becomes greatly inhibited and the Raman spectra of titania on such surfaces exhibit features that indicate substrate-TiO₂ interfacial reactions.