Hari Sutrisno, Sunarto
TiO2-polycristalline microspheres were prepared by wet chemical synthesis using titanium aquo oxo chloride ([Ti8O12(H2O)24]Cl8.HCl.7H2O) as titanium source. The morphology and structure of sample was observed using high resolution scanning electron microscopy (HR-SEM), high resolution transmission electron microscopy (HR-TEM), FT-Raman spectroscopy, FT-IR spectroscopy, X-ray diffraction (XRD) and high temperature X-ray diffraction (HT-XRD). Microstructure of TiO2 phases were determined from HT-XRD measurement data at various temperatures from 100°C to 1000°C at intervals of 50°C. The morphology of sample shows a distribution of microspheres of approximately 0.5 to 1.0 mm. Detailed measurements of sample from XRD spectra exhibit monoclinic structure (TiO2(B) phase) of TiO2-polycristalline microspheres. The HT-XRD results indicated that diffraction peaks of TiO2-polycrystalline microspheres are indexed as TiO2(B) phase from 100 to 250°C and as anatase phase from 300 to 650°C, while mixed crystals of anatase and rutile were observed at temperatures measurement from 700 to 800°C. Finally, pure rutile phase has formed at temperatures measurement from 850 to 1000°C. The results of microstructure analysis show that the anatase structure could be indexed to I41/amd (no. 141) space group with tetragonal symmetry at temperatures measurement: 600 and 750°C, while the rutile structure could be indexed to P42/mnm (no. 136) space group with tetragonal symmetry at 750 and 950°C. © 2017, Hanyang University. All rights reserved.
Department of Chemistry Education, Faculty of Mathematics and Natural Science, Yogyakarta State University, Campus Karangmalang, Yogyakarta, 55281, Indonesia
