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pH Effect on Titania‐Phase Transformation of Precipitates from Titanium Tetrachloride Solutions
Author(s) -
Sun Jing,
Gao Lian
Publication year - 2002
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.1151-2916.2002.tb00467.x
Subject(s) - rutile , titanium tetrachloride , anatase , phase (matter) , hydrolysis , titanium , materials science , inorganic chemistry , precipitation , transformation (genetics) , chemistry , nuclear chemistry , chemical engineering , metallurgy , catalysis , organic chemistry , photocatalysis , biochemistry , physics , meteorology , engineering , gene
Precipitates in different structures were prepared by the hydrolysis of a TiCl 4 solution at room temperature and 70°C. The pH effect on titania‐phase transformation was investigated. The original precipitate formed by the hydrolysis of titanium tetrachloride formed a gel‐like structure at pH 4 with the addition of NH 4 OH, which could be changed to essentially 100% rutile phase at 600°C. The rutile precipitates prepared at 70°C could be changed to mixed‐phase product at pH 0.50 and total anatase phase at pH 3.13 and 5.15. Complete phase transformation from anatase to rutile occurred in the three samples at 700°C.