caa a22 4500 388020628 CHVBK 20180307124923.0 cr unu---uuuuu 161130e199809 xx s 000 0 eng 10.1557/JMR.1998.0363 doi S0884291400045994 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0363 Micro-Raman Spectroscopic Characterization of Nanosized TiO2 Powders Prepared by Vapor Hydrolysis [Elektronische Daten] Micro-Raman analysis was used to study the structure of TiO2 powders produced at low (260 °C) and high (600-900 °C) temperatures by vapor hydrolysis of titanium tetraisopropoxide (TTIP). Spatial inhomogeneity was discovered after the amorphous TiO2 powders produced at low temperature were calcined at 700, 800, and 900 °C for 3 h. The TiO2 powders produced at high temperatures (from 600 to 900 °C) were found to be spatially homogeneous and predominately anatase in structure. Small amounts of rutile and brookite are found for powders produced at 700, 800, and 900 °C after calcination at 600 °C for 3 h. The rutile and brookite impurities are believed to be concentrated on the surface of anatase based on a comparison of results of Raman and x-ray diffraction studies. Copyright © Materials Research Society 1998 Zhang Yun-Hong Department of Chemical Engineering, The Hong Kong University of Science and Technology, Hong Kong, China Chan Chak K. Department of Chemical Engineering, The Hong Kong University of Science and Technology, Hong Kong, China Porter John F. Department of Chemical Engineering, The Hong Kong University of Science and Technology, Hong Kong, China Guo Wei Department of Chemical Engineering, The Hong Kong University of Science and Technology, Hong Kong, China Journal of Materials Research Cambridge University Press 13/9(1998-09), 2602-2609 0884-2914 13:9<2602 1998 13 JMR https://doi.org/10.1557/JMR.1998.0363 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0363 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhang Yun-Hong Department of Chemical Engineering, The Hong Kong University of Science and Technology, Hong Kong, China NATIONALLICENCE 700 1- Chan Chak K. Department of Chemical Engineering, The Hong Kong University of Science and Technology, Hong Kong, China NATIONALLICENCE 700 1- Porter John F. Department of Chemical Engineering, The Hong Kong University of Science and Technology, Hong Kong, China NATIONALLICENCE 700 1- Guo Wei Department of Chemical Engineering, The Hong Kong University of Science and Technology, Hong Kong, China NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/9(1998-09), 2602-2609 0884-2914 13:9<2602 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge