UNSPECIFIED. (2004) The role of Sb5+ in the structure of Sb2O3-B2O3 binary glasses - an NMR and Mossbauer spectroscopy study. SOLID STATE NUCLEAR MAGNETIC RESONANCE, 26 (3-4). pp. 172-179. ISSN 0926-2040

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Abstract

Glasses of general formula xSb(2)O(3) (1-x)B2O3 (0 less than or equal to x less than or equal to 0.8) have been prepared by conventional melt- quenching. Mossbauer spectroscopy shows that a fraction of the Sb3+ is converted to Sb5+ and this fraction increases with x. High-field B-11 MAS NMR gives well-resolved resonances from boron atoms which are 3- and 4-coordinated to oxygen. The fraction of 4-coordinated boron, N-4, goes through a maximum value of 0.12 +/- 0.01 at x = 0.5. The position of the maximum in N-4 is consistent with the cation potential for Sb3+, as observed for other systems. However, the low value of N-4 at this maximum is not so readily explained. The values are similar to those predicted if [BO4](-) were stabilised by [SbO4](+) but the trends with composition are different. (C) 2004 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QC Physics
Journal or Publication Title:	SOLID STATE NUCLEAR MAGNETIC RESONANCE
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
ISSN:	0926-2040
Date:	November 2004
Volume:	26
Number:	3-4
Number of Pages:	8
Page Range:	pp. 172-179
Identification Number:	10.1016/j.ssnmr.2004.02.004
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/7979

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