Fully quantitative X-ray characterisation of Evonik Aeroxide TiO2 P25 (R)

authors	Tobaldi, DM; Pullar, RC; Seabra, MP; Labrincha, JA
nationality	International
journal	MATERIALS LETTERS
author keywords	X-ray methods; Degussa P25 (R); Photocatalysis; Whole powder pattern modelling (WPPM); Microstructure
keywords	DEGUSSA P25; MICROSTRUCTURAL CHARACTERIZATION; PHOTOCATALYTIC DEGRADATION; TITANIA; RUTILE; ANATASE; ACID
abstract	Photocatalysis with TiO2 is one of the most promising methods for combatting environmental pollution. Of commercially available photocatalysts, Evonik Aeroxide (formerly Degussa) P25 (R) titania is probably the most extensively used. In this communication, we quantitatively characterise the full phase composition (both crystalline and amorphous content) of P25, as well as the microstructure of individual phases (crystalline domain size distribution and dislocation density). This was achieved with advanced X-ray diffraction (XRD) methods: Rietveld-RIR and whole powder pattern modelling (WPPM). Quantitative phase analysis (QPA) showed the precise composition of P25 to be 76.3 wt% anatase, 10.6 wt % rutile and 13.0 wt% amorphous, and microstructural details are given for the two crystalline phases. (C) 2014 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE BV
issn	0167-577X
year published	2014
volume	122
beginning page	345
ending page	347
digital object identifier (doi)	10.1016/j.matlet.2014.02.055
web of science category	Materials Science, Multidisciplinary; Physics, Applied
subject category	Materials Science; Physics
unique article identifier	WOS:000335109500090