ISSN:
1551-2916
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Hydrous titanium dioxide (TiO2·n H2O) was used to prepare K2Ti2O5 single crystals, K2Ti4O9 whiskers and K2Ti6O13 whiskers at 820°, 940°, and 1110°C, respectively, by calcination. At T 〈 820°C, dehydration of hydrous titania, decomposition of potassium carbonate, and reaction between titanate and potassium oxide occurred simultaneously, ending with a crystallization reaction of K2Ti2O5 single crystals at 820°C. Subsequently, K2Ti2O5 single crystals convert into K2Ti4O9 whiskers at 940°C, and K2Ti4O9 whiskers further convert into K2Ti6O13 whiskers at 1110°C. The reaction temperatures for the generations of these types of potassium titanates were all 10°–40°C lower than the corresponding temperatures when anatase was used as the reactant. The whiskers synthesized in the present study exhibited uniform size, good morphology, and a high yield.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1551-2916.2004.00326.x
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