Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 380, Issue 1-2, Pages 67-72Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2004.03.045
Keywords
ceramics; sol-gel preparation; crystal growth; titania oxide; phase transformation; sintering
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In this study, the effects of aging on the crystalline phases, crystallite sizes, and sintering properties of TiO2 gels were investigated by using thermogravimetry (TG), differential thermal analysis (DTA), X-ray diffractometer (XRD), dilatometer and scanning electron microscopy (SEM). With increasing aging time, the hydroxyl ions existing in the anatase lattice decreased, and so the oxygen vacancy concentration produced after calcination decreased. Consequently, increasing aging time during sintering lowered the crystallite growth rate of anatase. The densification of the TiO2 powders was dependent upon the aging time which shifted the anatase --> rutile (a --> r-TiO2) phase transformation to higher temperature and lowered the crystallite growth rate during sintering. (C) 2004 Elsevier B.V. All rights reserved.
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