TY - JOUR
T1 - Effects of aging on the phase transformation and sintering properties of TiO2 gels
AU - Hsiang, Hsing I.
AU - Lin, Shih Chung
N1 - Funding Information:
The authors would like to express their thanks to the National Science Council of the Republic of China for financial support of this project (NSC91-2216-E-006-049).
PY - 2004/8/25
Y1 - 2004/8/25
N2 - 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.
AB - 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.
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U2 - 10.1016/j.msea.2004.03.045
DO - 10.1016/j.msea.2004.03.045
M3 - Article
AN - SCOPUS:3242727497
SN - 0921-5093
VL - 380
SP - 67
EP - 72
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1
ER -