(LiCl)2-B2O3-SiO2 xerogels were prepared by a sol-gel technique. Fourier transform infrared (FTIR) spectra indicate the incorporation of boron into the silica network to form Si-O-B links. 11B, 7Li and 29Si nuclear magnetic resonance (NMR) spectroscopies were used to probe the structure of the xerogels. For a fixed lithium content (10 mol% (LiCl)2), the ionic conductivity of xerogels with B2O3/SiO2 ratios of 1/7 to 1/5 is similar to that of lithium chloride, while the conductivity behavior of xerogels with B2O3/SiO2 ratios of 1/10 to 1/8 is similar to those of ionically conducting glasses. For samples with the same lithium content, the conductivity increases with decreasing B2O3/SiO2 ratio and increasing fraction of BO4 units (N4 values). This is attributed to the increasing concentration of lithium ions associated with tetrahedral BO4 and non-bridging oxygens in the xerogel.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics