X-ray diffraction study of TiO2 thin films on mica

Angle-Dependent Optical Effects Deriving from Submicron Structures of Films and Pigments

“…When the less usual substrate phlogopite is used instead of muscovite, a partial conversion to rutile is observed above 850 °C. Eskelinen sees the reason for this difference in a migration of Al ions from the mica into the anatase layer, which then inhibits the phase transition. − But the anatase modification is also solely found below 1000 °C, if aluminum-free SiO 2 or alumina itself is used as a substrate instead of mica. The most probable explanation is a considerable constraint in the film which counteracts the volume contraction during rutilization and delays the phase transition. , …”

“…The anatase layers on mica show a preferred crystal orientation when they are very thin, , e.g., <40 nm. The upper layers then lose the preference.…”

“…The most probable explanation is a considerable constraint in the film which counteracts the volume contraction during rutilization and delays the phase transition. 80,86 The anatase layers on mica show a preferred crystal orientation when they are very thin, 81,86 e.g., <40 nm. The upper layers then lose the preference.…”

Melamine–formaldehyde curing acceleration by TiO2-based silver-white pigments catalysis

“…This indicates that the silver white pigments used in the printing ink of décor paper are predominantly composed of rutile TiO 2 and mica 10,11 . However, there may exist a complex double peak at 2θ = 54°/55° with an intensity lower than that of rutile peak and some small peaks within the 2θ values of 30°-35° attributable to anatase phase that are probably masked by the rutile TiO 2 and mica peaks, respectively 12,13,15 . The intensity of the 2θ =26.7° peak is high and the width of the (101) plane becomes narrow 12,14,15 .…”

“…However, there may exist a complex double peak at 2θ = 54°/55° with an intensity lower than that of rutile peak and some small peaks within the 2θ values of 30°-35° attributable to anatase phase that are probably masked by the rutile TiO 2 and mica peaks, respectively 12,13,15 . The intensity of the 2θ =26.7° peak is high and the width of the (101) plane becomes narrow 12,14,15 . The sharpness of the peak indicates that the pigment possess a good crystalline nature with a dominant phase of rutile TiO 2 16-…”