Abstract
The effect of chlorine on the structure of AlF3/YF3‐based fluoride glasses was studied by XPS. The changes in the bonding state of cations with increase of chlorine content were all investigated by measuring the composition‐depend‐ dent changes in the relative concentration and binding energy of related cations. It was proposed that the chlorine replaces the bridging fluorine by which the [AlFn] and [YFm] polyhedra are connected and result in the formation of [AlFn‐uClu] and [YFm‐vClv] polyhedra. In the low BaCl2 content region (<6 mol%), as many chlorine as possible attack [A1FJ and [YFm] polyhedra, and with the increase of chlorine content, they replace more fluorines in [YFm] polyhedra, while the number of chlorines in [AIFn‐uClu] polyhedra remains a low constant value. In the high BaCl2 content region (>6 mol %), the chlorines replace more fluorines in the already formed [AlFn‐uClu] polyhedra and do not attack other [AlF] polyhedra, while the composition of [YFm‐vClv] polyhedra does not change.
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