Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 91, Issue 8, Pages 2455-2463Publisher
WILEY
DOI: 10.1111/j.1551-2916.2008.02456.x
Keywords
-
Categories
Ask authors/readers for more resources
Nano and submicrometer scale titanium oxide (TiO2) powders were synthesized by solid and molten salt synthesis (SSS and MSS) from amorphous titanium hydroxide precipitate. Sodium chloride (NaCl) and dibasic sodium phosphate (Na2HPO4.2H(2)O, DSP) separately or as mixture with different weight ratios were used as the salts. At the eutectic salt composition (20% DSP/80% NaCl), the microstructure and phase composition of the TiO2 was changed from equiaxed nanoparticles of anatase with size similar to 40-50 nm, to mixed microstructure of bundle and acicular particles of rutile with 0.05-0.2 mu m diameter, 6-10 mu m length, and aspect ratio 20-60 depending on treatment time and temperature. At high temperature (825 degrees C) and long time (30 h), microstructural differences were significant for the powders treated with different salts. Particle morphologies ranged from equiaxed, to acicular, to bundles, to nanofibers with very high aspect ratio. At lower treatment temperature (725 degrees C) for shorter time (3 h), the morphology of the products did not change with different salt compositions, but the crystallite sizes changed appreciably. Different starting titanium precursors influenced particle size at lower temperature and time. Titanium hydroxide heat treated without salt resulted in significant grain growth and fused secondary particles, as compared with more finely separated and lightly agglomerated powders resulting from SSS and MSS treatments.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available