Phase development in La2O3 doped Al2O3:TiO2 ceramic membranes

• Published in: Journal of the European Ceramic Society
• Main Author: Stefan Björkert U.; Mayappan R.; Holland D.; Lewis M.H.
• Format: Article
• Language: English
• Published: Elsevier BV 1999
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032696352&doi=10.1016%2fS0955-2219%2899%2900004-7&partnerID=40&md5=523e61a69519a9579d743d7753e7f4f0

The phase development of sol derived diphasic Al2O3:TiO2 membranes doped with La2O3 is described together with their pore structure and microstructure. These nanostructrual membranes have been characterised using 27Al MAS-NMR, TEM, BET, XRD and thermal analysis in an attempt to derive a comprehensive description. The membrane materials have been subjected to heat treatments ranging from 275°C to 1200°C in air. Doping the diphasic membrane has been shown to increase the transformation temperature of the low temperature phases (γ-alumina and anatase) by as much as 200°C. There is indication that La2O3 doping also retards the reorganisation of Al in the γ-alumina phase preventing it from forming other intermediate aluminas.