Local order of Ca in a CaF2–Al2O3–SiO2 glass by electron energy-loss spectroscopy

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Local order of Ca in a CaF2–Al2O3–SiO2 glass is studied using electron energy loss spectroscopy technique. The energy shift of ionization threshold in the Ca L2,3 and the differences in the near-edge structure of the Ca M2,3 edge between the glasses with and without F suggest the local ordering of F around Ca in the F-containing aluminosilicate glass. The local order phenomenon requires the clustering of Ca–F. Therefore, the transparent fluorinated calcium aluminosilicate glass is not structurally and compositionally homogeneous at nanometer scale.