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Nanocrystalline samples of Ba 1-x Ca x F 2 prepared by high-energy milling show an unusually high Fion conductivity, which exhibit a maximum in the magnitude and a minimum in the activation energy at x = 0.5. Here, we report an X-ray absorption spectroscopy (XAS) at the Ca and Sr K edges and the Ba L 3 edge and a molecular dynamics (MD) simulation study of the pure and mixed fluorides. The XAS measurements on the pure binary fluorides, CaF 2 , SrF 2 and BaF 2 show that high-energy ball-millingdoi:10.1088/1757-899x/80/1/012005 fatcat:asozoh4kdfbuhghnvhtfob4zhy