Patra, Amitava and Ganguli, Dibyendu (1992) Paramagnetic centers in unirradiated boron-doped silica-gel. Journal of Non-Crystalline Solids, 144 (1). pp. 111-113. ISSN 0022-3093

PDF - Published Version Restricted to Registered users only Download (178Kb) | Request a copy

Abstract

Unirradiated alkoxide-derived silica gels containing 2.5 mol% B2O3, heated at 500-degrees-C for 0.5 h, exhibited an absorption peak at 218 nm which decreased in intensity with increase in temperature (800-degrees-C, 0.5 h) or duration of heating (1-5 h). This suggests that these effects are due to the formation and decay of paramagnetic defects in the gel structure. An electron spin resonance spectral signal (g = 2.002) confirmed the generation of such defects in a sample heated at 500-degrees-C/0.5 h. The signal decreased in intensity or vanished with increase in temperature or duration of heating.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	Sol Gel
Depositing User:	Bidhan Chaudhuri
Date Deposited:	28 Nov 2013 08:15
Last Modified:	28 Feb 2016 16:51
URI:	http://cgcri.csircentral.net/id/eprint/2342

Actions (login required)

View Item