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Low‐Temperature Nucleation of Rutile Observed by Raman Spectroscopy during Crystallization of TiO 2
Author(s) -
Ocaña Manuel,
GarciaRamos Jose V.,
Serna Carlos J.
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb07237.x
Subject(s) - rutile , anatase , raman spectroscopy , nucleation , crystallization , materials science , amorphous solid , calcination , impurity , phase (matter) , chemical engineering , titanium , mineralogy , inorganic chemistry , crystallography , chemistry , metallurgy , catalysis , organic chemistry , optics , photocatalysis , physics , engineering
The thermal evolution of amorphous TiO 2 powders, consisting of spherical particles and prepared by hydrolysis of a titanium ethoxide aerosol, was studied by using Raman spectroscopy. On calcination at 350°C, the solid crystallized, giving anatase as a major phase. A small amount of rutile was also detected and attributed to small seeds localized at the particle outlayer. The nucleation of rutile at so low a temperature was ascribed to the presence of organic impurities in the powders. The transformation of anatase into rutile was clearly observed after heating at 660°C.