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

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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

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