# Investigations of structure and transport in lithium and silver borophosphate glasses

Kumar, Sundeep and Vinatier, Philippe and Levasseur, Alain and Rao, KJ (2004) Investigations of structure and transport in lithium and silver borophosphate glasses. In: Journal of Solid State Chemistry, 177 (4-5). pp. 1723-1737.

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## Abstract

Glasses in the system $xLi_2O_ (1-x)[0.5B_2O_3\cdot0.5P_2O_5]$ and $xAg_2O_ (1-x)[0.5B_2O_3\cdot0.5P_2O_5]$ have been prepared from melt quenching method. Glasses have been characterized for their densities, molar volumes, glass transition temperatures and heat capacities. Structural studies have been done using infrared and high resolution magic angle spinning nuclear magnetic resonance (HR MAS NMR) of $^{31}P, ^{11}B$ and $^7Li$ nuclei. Boron is present only in tetrahedral coordination except in $Li_2O-$rich glasses. Transport properties have been investigated over a wide range of frequency and temperature. Silver containing glasses are found to possess higher conductivities and lower barriers than lithium containing glasses. A structural model has been proposed in which pure $B_2O_3–P_2O_5$ compositions are assumed to be constituted of $BPO_4$ units and modi.cation occurs selectively on the phosphate moiety. Tetrahedral boron units are thus expected to be retained in the glass structure.

Item Type: Journal Article The copyright belongs to Elsevier. Borophosphate glasses;BPO4 glass;NBO–BO switching and tetrahedral boron Division of Chemical Sciences > Materials Research CentreDivision of Chemical Sciences > Solid State & Structural Chemistry Unit Anka Setty 23 May 2006 19 Sep 2010 04:26 http://eprints.iisc.ac.in/id/eprint/6794