New organic-inorganic hybrid superionic conductor glasses consisting of silver iodide and alkylbis-trimethylammonium diiodides

New organic-inorganic hybrid superionic conductor glasses were developed, which consisted of silver iodide (AgI) and alkylbis-trimethylammonium diiodides. The glasses were prepared from low-temperature molten salts of them by melt quenching method, which were confirmed in glassy state by X-ray diffraction (XRD), DSC and optical microscope observation. The ionic conductivity of these glasses are about 10^-2 Ω^-1 cm^-1 at room temperature which is the best in the organic-inorganic hybrid superionic conductor glasses obtained so far. Ag-109 NMR spectra of the glasses showed a motionally narrowed peak at about 800 ppm regardless of their compositions, which is almost equal to the value of AgI crystals. These results are in good agreement with the prediction of the percolation model, where the silver cations are assumed to diffuse through the conduction channels of face-sharing iodide tetrahedra, which are randomly blocked by organic substances.