UNSPECIFIED (2003) Site symmetry in binary and ternary tin silicate glasses - Si-29 and Sn-119 nuclear magnetic resonance. In: Symposium on New Directions in Glass Structure and Dynamcs, OCT, 2002, PITTSBURGH, PENNSYLVANIA.

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Abstract

Si-29 and Sn-119 nuclear magnetic resonance (NMR) spectroscopy has been performed on binary xSnO(100-x)SiO2 and ternary xR(2)O(50-x)SnO50SiO(2) glasses (R = Li, Na, K, Rb for the Si-29 NMR and R = Na for Sn-119 NMR). The spectra obtained have been fitted to obtain the spectral parameters. The variation of these parameters as a function of composition has been compared with structural information from previous density, neutron diffraction and Mossbauer spectroscopy studies. Tin is found to be present as Sn(II) in the binary silicate glasses but some Sn(IV) is present in the ternary glasses. The fraction of tin in the Sn(IV) oxidation state increases with the concentration of Na2O. The Si-29 chemical shift reflects the average oxygen coordination number in the glass and the electronegativity of the neighbouring species. The Sn-119 chemical shift shows different behaviour with SnO concentration for the binary and ternary systems and the latter give significantly narrower lines, indicating more symmetric Sn-119 sites.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher:	IOP PUBLISHING LTD
ISSN:	0953-8984
Date:	13 August 2003
Volume:	15
Number:	31
Number of Pages:	16
Page Range:	S2457-S2472
Publication Status:	Published
Title of Event:	Symposium on New Directions in Glass Structure and Dynamcs
Location of Event:	PITTSBURGH, PENNSYLVANIA
Date(s) of Event:	OCT, 2002
URI:	http://wrap.warwick.ac.uk/id/eprint/9348

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