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Infrared and MAS NMR studies of potassium borovanadate glasses

IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata

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Title Infrared and MAS NMR studies of potassium borovanadate glasses
Creator Viswanatha, R
Reddy, M Venkata Subba
Reddy, C Narayana
Chakradhar, R P S
Subject Glass
Description Glass system of the composition xK(2)O-(90 - x)B2O3-10V(2)O(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 elect ronegativity principle, leading to the formation of [B2V2O9](2-) (type I and type II), [BO4/2](-) and [BO2/2O](-). This is followed by a structural rearrangement that is the ratio of B-4/B-4 + B-3 = N-4 increases up to 40 K2O 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. (C) 2008 Elsevier B.V. All rights reserved.
Publisher Elsevier
Date 2008-10-29
Type Article
Format application/pdf
Identifier http://cgcri.csircentral.net/479/1/reddy.pdf
Viswanatha, R and Reddy, M Venkata Subba and Reddy, C Narayana and Chakradhar, R P S (2008) Infrared and MAS NMR studies of potassium borovanadate glasses. Journal of Molecular Structure, 889 (1-3). pp. 197-203. ISSN 0022-2860
Relation http://cgcri.csircentral.net/479/