Abstract
In order to understand the role of fluorine incorporation on the structure of fast ion conducting lithium borate glasses, the binary xLi 2O · (1−x)B 2O 3 glasses with x = 0.3, 0.4 and 0.5 have been fluorinated and studied using variety of experimental techniques including X-ray photoelectron spectroscopy (XPS), infrared spectroscopy, complex impedance measurement and X-ray diffractometry (XRD). XPS results have shown that O 1s spectra could be described in terms of bridging (BO) and non-bridging oxygens (NBO). The ratio of these two seems to increase with increase in Li 2O content. However, this ratio decreases with the increase of fluorine content. F 1s XPS spectra consist of two peaks showing clearly the existence of two different fluorine environments. It was found that with increase in fluorine content the number of four-coordinated boron atoms increases and the BO 3 groups with non-bridging oxygen atoms decreases. These results provide definite evidence for fluorine participation in the boron-oxygen network. These structural modifications are found to affect the glass transition temperature T g dc conductivity of fluorinated lithium borate glasses decreases with the increase of fluorine content. Results from XPS, conductivity and DSC measurements are correlated.
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