Fully quantitative X-ray characterisation of Evonik Aeroxide TiO₂ P25^庐

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• 作者：D.M. Tobaldi ; ^{david.tobaldi@ua.pt" class="auth_mail} ; ^{david@davidtobaldi.org" class="auth_mail} ; R.C. Pullar ; M.P. Seabra ; J.A. Labrincha
• 关键词：X-ray methods ; Degussa P25® ; Photocatalysis ; Whole powder pattern modelling (WPPM) ; Microstructure
• 刊名：Materials Letters
• 出版年：1 May, 2014
• 年：2014
• 卷：122
• 期：Complete
• 页码：345-347
• 全文大小：538 K

文摘

Photocatalysis with TiO₂ is one of the most promising methods for combatting environmental pollution. Of commercially available photocatalysts, Evonik Aeroxide (formerly Degussa) P25^庐 titania is probably the most extensively used. In this communication, we quantitatively characterise the full phase composition (both crystalline and amorphous content) of P25^庐, 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.