New Anionic Conductor KSbF4 with Fluorite Structure

A new fluoride ion conductor, (beta)-form of KSbF, was synthesized and characterized by the conductivity, DTA, XRD, and F NMR measurements. The low temperature modification, (alpha)-form, showed an irreversible phase transition at 455 K accompanied by a steep increase in conductivity. This high temperature modification was stable on cooling and belongs to a cubic system above 420 K with a disordered fluorite structure. F NMR linewidth measurement for this modification suggested a high conductivity due to the fluoride ion.