Use of emanation thermal analysis for in-situ monitoring of microstructurechanges during heating of hydrous titania and titania containing 10% ruthenia

Results of emanation thermal analysis (ETA) and thermogravimetry (TG) of hy drous titania and titania containing 10% of ruthenia measured during heatin g in argon from 20 degrees C to 1000 degrees C are presented. The ETA resul ts are interpreted by comparison with the results of traditional methods su ch as TG, DTA, XRD, TEM, and surface area measurement. A correspondence of the results was found. The ETA made it possible to monitor microstructure c hanges under in-situ conditions of heat treatment of the samples. From the ETA results measured during cooling of the heated samples to selected tempe ratures the values of the activation energy of radon diffusion were determi ned in order to characterise surface annealing and compaction of samples du ring heating. (C) 1999 Elsevier Science B.V. All rights reserved.