Mechanochemical synthesis, structure, and properties of solid solutions of alkaline earth metal fluorides: M a 1-x M b x F 2 (M: Ca, Sr, Ba)
作者： M. Heise , G. Scholz , A. Düvel , P. Heitjans , E. Kemnitz
DOI: 10.1016/J.SOLIDSTATESCIENCES.2016.08.004
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摘要: Abstract The capability of mechanochemical synthesis for the formation solid solutions alkaline earth metal fluorides Ma1−xMbxF2 (M: Ca, Sr, Ba) was tested by fluorination acetates and hydroxides with ammonium fluoride directly at milling. Evidence found a mutual substitution cations on their lattice positions in Ca1−xSrxF2 Ba1−xSrxF2 samples. For Ba/Ca-system this route is only partially successful. X-ray diffraction 19F MAS NMR spectroscopy were used to characterize all samples concerning crystal structure local fluorine coordination. Calculations chemical shifts superposition model along probability calculations intensity individual lines, performed dependence molar composition samples, perfectly agree experimental findings. ion conductivity as-prepared determined temperature dependent DC measurements, significantly higher than those crystalline binary fluorides. Moreover, F− observed mixing grade Ca/Sr-and Ba/Sr-systems.
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