ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
High concentrated hydrochloric/nitric/sulfuric acid were used to dissolve Ti(OH)4produced with TiOSO4. It was found that, titania, from pure rutile phase to anatase-rutile mixedphase to pure anatase phase have been synthesized at low temperature in liquid media throughcontrolling the hydrolyzation conditions. The phase composition and the special surface area ofnanometer titania powder were characterized by means of XRD and BET. The K-edge fine structureof Ti atom sites of rutile TiO2 was investigated with grazing incidence reflection mode XAFS(EXAFS and XANES) spectroscopy. The well-crystal rutile TiO2 with fine particle size and highspecific surface (above200m2/g) was formed at low temperature below 80°C, while the anataseTiO2 was formed at higher temperature in hydrochloric or nitric acid solution. But in sulfuric acidsolution the crystal phase was always anatase at any temperatures. The EXAFS and XANES resultshowed that the order of the lattice, the coordination numbers of the Ti atom for the first shell, thesecond shell and the third shell as well as the relative intensity of K-preedge three peaks increasedwith the increase of the rutile TiO2 nanoparticle size
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.3.pdf
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