Chloride ion conductor CH 3NH 3GeCl 3 studied by Rietveld analysis of X-ray diffraction and 35Cl NMR

Abstract

The chloride ion conductor CH 3NH 3GeCl 3 was characterized by DTA, Rietveld analysis of the powder X-ray diffraction, and 35Cl NMR. The mobile ion at the high temperature phase was deduced to be a chloride ion, because a disordered perovskite structure at the Cl site was found by the Rietveld analysis. This disordered model was also confirmed by 35Cl NMR. The mechanism of the ionic conductivity and the process to attain a conducting phase were discussed on the basis of the temperature dependence of the powder X-ray diffraction and the spin-lattice relaxation times of 35Cl NMR.