Abstract
Gallium K-edge extended X-ray absorption fine structure (EXAFS) spectra of PbO–Ga 2O 3 glasses were recorded at liquid-nitrogen temperature (77 K) to understand the coordination scheme of gallium in these glasses. Four oxygens were found to be bonded to each Ga, forming GaO 4 tetrahedra with an average bond distance of 1.855–1.862 Å. Assuming a non-Gaussian distribution of Ga–O bond distances provided better results with a smaller R-factor compared to the Gaussian counterpart. Two-subshell fitting indicated that oxygens with Ga–O bond distance of ∼1.87 Å are bonded to three cations, while the shorter Ga–O bonded oxygens are two-coordinated.
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