Infrared and MAS NMR studies of potassium borovanadate glasses

Viswanatha, R and Reddy, Venkata Subba M and Reddy, Narayana C and Chakradhar, Sreekanth RP (2008) Infrared and MAS NMR studies of potassium borovanadate glasses. In: Journal of Molecular Structure . (In Press)

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Abstract

Glass system of the composition $xK_2O-(90-x)B_2O_3-10V_2O_5$ (where x = 10, 20, 30, 40, and 50 mol%) have been prepared by melt quenching technique and characterized for their densities, and glass transition temperatures. The structure of the glasses has been investigated using infrared and magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. The structural changes occur due to the addition of modifier oxide. Modification is based on the Sanderson’s electronegativity principle, leading to the formation of $[B_2V_2O_9]^{2-}$ (type I and type II), $[BO_{4/2}]^-$ and $[BO_{2/2}O]^-$. This is followed by a structural rearrangement that is the ratio of $B_4/B_4 + B_3 = N_4$ increases up to 40 $K_2O$ mol%, further increase in modifier oxide concentration levels off $N_4$. The nature of speciation is examined using structural model. The variation of different properties is consistent with this model.

Item Type:	Journal Article
Publication:	Journal of Molecular Structure
Publisher:	Elsevier B.V.
Additional Information:	Copyright of this article belongs to Elsevier B.V. The article is in press and the remaining publication details are awaited.
Keywords:	IR;MAS NMR;DSC;Borovanadate glasses
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	27 Mar 2008
Last Modified:	19 Sep 2010 04:43
URI:	http://eprints.iisc.ac.in/id/eprint/13510

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