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The electrical conductivity results of lithium borosilicate glasses with addition of Li2SO4 and LiCl have been critically analyzed. In general, it is observed that the factors viz. lithium fraction, fLi and the number of non-bridging oxygens (NBOs) govern the ionic conductivity in the lithium conducting glasses. For the same fLi, the presence of mixed formers in the glass gives higher conductivity compared to that of the glass with only one former. Thus the competitive network of glass in mixed former systems provides higher mobilities for lithium ions and hence high ionic conductivity. The addition of Li2SO4 and LiCl in the lithium borosilicate glasses gave enhancement in the conductivity. However, the mechanism of enhancement in conductivity is different in the two glass systems. The comparison of the result of binary, ternary and quaternary glass systems suggests that in general, the decrease in activation energy, increase in fLi and increase in NBOs gives rise to enhancement in conductivity. For the same value of fLi the higher conductivity is exhibited by glasses with lower value of K (K=SiO2/B2O3).
Ionics – Springer Journals
Published: Mar 24, 2006
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