Analysis of the local structure of phosphorus-substituted LAMOX oxide ion conductors

摘要: The effect of partial substitution molybdenum by phosphorus on the global and local structural arrangement fast oxide-ion conductor La2Mo2O9 (LAMOX) has been studied X-ray powder diffraction as well 139La 31P solid state NMR. patterns show that La2Mo2−yPyO9−y/2 forms a solution at low concentrations, there is phase transition upon increasing concentration. This also reflected in NMR spectra. possibility to excite multiple-quantum coherences one signals gives evidence an accumulation atoms neighbouring Mo-type sites already before formation three-dimensional precipitates. On basis our results we propose possible compound explains experimental observations crystal twinning.