Polymorphism in TiO2 under the influence of CuO and MnO2
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Titanium dioxide shows polymorphism on heating to a higher temperature. This transformation is strongly dependent on temperature and time of heating. Pure Titania pulp containing amorphous titania was heated at different temperatures and for different times. Above 650oC the anatase phase evolved and between 900-1000 oC, an anatase-rutile transformation occurred. The anatase-rutile transformation in TiO2 in the presence of CuO and MnO2 was investigated. The different phases of TiO2 were determined using powder XRD. Other methods such as chemical analysis, scanning electron microscopy, surface area measurements and crystallite size calculations were used for the characterization of the samples. The transformation temperature was found to be much lowered in the presence of the above metal oxides. Also the method of preparation of metal oxide doped TiO2 affects the polymorphism.
Abstract
Titanium dioxide shows polymorphism on heating to a higher temperature. This transformation is strongly dependent on temperature and time of heating. Pure Titania pulp containing amorphous titania was heated at different temperatures and for different times. Above 650oC the anatase phase evolved and between 900-1000 oC, an anatase-rutile transformation occurred. The anatase-rutile transformation in TiO2 in the presence of CuO and MnO2 was investigated. The different phases of TiO2 were determined using powder XRD. Other methods such as chemical analysis, scanning electron microscopy, surface area measurements and crystallite size calculations were used for the characterization of the samples. The transformation temperature was found to be much lowered in the presence of the above metal oxides. Also the method of preparation of metal oxide doped TiO2 affects the polymorphism.