A composite glass, CuI–Cu2MoO4, was found to have a room-temperature ionic conductivity that corresponded to ionic liquid conductivity. Pulsed neutron scattering and XAFS measurements showed that the main framework of the sample was made up of [MoO4] tetrahedra and [MoO6] octahedra. The Cu+ ions were bound to two O atoms or four I atoms. The atomic motion below 0.02eV, at room temperature, was close to that of the α-CuI crystalline state near to its melting point. In addition to the boson peak at above 200K, quasi-elastic neutron scattering due to the local diffusion of Cu+ ions was found at energies of 0.005eV. The long-range translational diffusion of Cu+ ions was demonstrated directly by high-resolution quasi-elastic neutron scattering results. The broadening was less than 0.0001eV. The hierarchical static and dynamic structure of the sample controlled the properties of the superionic conducting glass.

Hierarchy of Dynamic Structure of Superionic Conducting Glass CuI–Cu2MoO4. K.Suzuki, K.Shibata, T.Tsurui, J.Kawamura: Journal of Non-Crystalline Solids, 1998, 232-234, 278-85