Dopants in Vapor‐Phase Synthesis of Titania Powders
作者:
M. Kamal Akhtar,
Sotiris E. Pratsinis,
Sebastian V. R. Mastrangelo,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 12
页码: 3408-3416
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb04442.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
Gas‐phase synthesis of titania by TiCl4oxidation in the presence of dopants (SiCl4, POCl3, and BCl3) was investigated in an aerosol reactor as a function of temperature (1300–1700 K) and dopant concentration (0–25 mol% of TiCl4). The addition of dopants, most notably silicon and phosphorus, drastically altered the morphology of titania particles from polyhedral to spheroidal, increased the extent of aggregation, increased the specific surface area, reduced the primary particle size, and decreased the rutile content. The observed morphology/crystallinity changes were explained in terms of ionic radii and valence of the dopant el
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