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Dopants in Flame Synthesis of Titania
Author(s) -
Vemury Srinivas,
Pratsinis Sotiris E.
Publication year - 1995
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.1151-2916.1995.tb09074.x
Subject(s) - rutile , anatase , dopant , materials science , chemical engineering , particle size , sintering , particle (ecology) , inorganic chemistry , mineralogy , doping , metallurgy , photocatalysis , chemistry , catalysis , organic chemistry , oceanography , optoelectronics , engineering , geology
The effect of dopants on the characteristics of titania particles made by oxidation of TiCl 4 in a laminar diffusion flame reactor is presented. Introduction of dopant SiCl 4 inhibits the transformation of anatase to rutile, due to the formation of interstitian solid solution of SiO 2 and TiO 2 . Silica decreases the sintering rate of titania and decreases the primary particle size, and, as a result, the specific surface area increases. Intruduction of SnCl 4 enhances the transformation of anatase to rutile, due to the similar crystalline structure of SnO 2 and rutile titania. However, the presence of SnO 2 and rutile titania. However, the presence of SnO 2 does not affect the primary particle size or the specific surface area of titania particles. Introduction of AICI 3 enhances the transformation of anatase to rutile, due to the formation of excess oxygen vacancies as Al 2 O 3 and TiO 2 form a substitutional solid solution.