TRANSISI FASA TITATNIUM OKSIDA MELALUI KONDENSASI EX-SITU HIDROGEN TITANAT TIPE STRUKTUR LEPIDOKSROSIT

Abstract

The objectives of the research are to study of the structure type of titanium dioxide (TiO 2 ) obtained form the ex-situ condensation of hydrated hydrogen titanates with the structure type of lepidocrocite. Hydrated hydrogen titanates were obtained by ion exchabge of H + for Cs + in cesium titanates by 1 M HCl solution by Chimie Douce method. The results show that TiO 2 (B), anatase, and anatase-rutile mixture were obtained heat treatment of hydrated hydrogen titanate at 100, 200, 300, 500, and 600 o c respectively. The powders were characterized by X-rays diffractometer (XRD), High Resolution Scanning Electron Microscopy (HRSEM) and High Resolution Transmission Electron Microscopy (HRTEM). The research indicated that the protonic titanate, H 0.54 Ti 1.865 0.135 O 4 0.5H 2 O ( =vacancy), lost the interlayer water by being heated up to 200 o C to produce a dehydrated phase, H 0.54 Ti 1.865 0.135 O 4 . Above 300 o C, the dehydrated phase completely transformed to TiO 2 (B) and anatase was obtained as pure phase at 600 o C. The phase transformed as the following process: H 0.54 Ti 1.865 0.135 O 4 0.5H 2 O a H 0.54 Ti 1.865 0.135 O 4 0.25H 2 Oa H 0.54 Ti 1.865 0.135 O 4 a TiO 2 (B) a TiO 2 -anatase.