Kundu, Debtosh and Manna, T and De, Goutam (2002) Preparation and characterization of thin optically transparent alumina and Ce-doped alumina. Journal of Sol-Gel Science and Technology, 23 (2). pp. 145-150. ISSN 0928-0707

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Abstract

Transparent and porous boehmite, gamma-Al2O3 (500degreesC) and theta-Al2O3 (900degrees and 1000degreesC) thin sheets (50-100 mum) have been prepared from boehmite sols. gamma-Al2O3 shows about 48% porosity and 292 m(2)/g surface area. On transformation from gamma-Al2O3 (500degreesC) to theta-Al2O3 (900degreesC), the porosity still remains high, i.e. similar to45%; however, the surface area becomes 138 m(2)/g. The porosity and surface area of theta-Al2O3 become about 41% and 97 m(2)/g respectively on further heating to 1000degreesC. A gradual increase of average pore radius during this thermal treatment suggests that coarsening of the pore occurred during the densification process. Both gamma-Al2O3 and theta-Al2O3 show high degree of transmission from UV to NIR wavelength region. Cerium exists in +4 oxidation state in the boehmite as well as in the gamma- and theta-Al2O3. The ultraviolet absorption edge of the alumina was tailored by varying the concentration of cerium.

Item Type:	Article
Uncontrolled Keywords:	Sol-gel; Alumina sheets; Ce-doped alumina
Subjects:	Engineering Materials
Divisions:	Sol Gel
Depositing User:	Bidhan Chaudhuri
Date Deposited:	23 Mar 2012 08:11
Last Modified:	23 Mar 2012 08:11
URI:	http://cgcri.csircentral.net/id/eprint/1358

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