Novel Dynamics of Superionic Conducting Glasses Proved by Inelastic Neutron Scattering

Abstract

The low-energy dynamics of Ag-based superionic conducting glass system has been investigated using the inelastic neutron scattering measurements. A clear correlation between the intensity in low-energy region and the dc ionic conductivity was found. The cross-linking factor is considered to be the network expansion by salt doping. Detailed investigations of low-energy dynamics both for varied superionic conducting glasses and insulator glass have proved that the peculiar Q dynamics beyond around 2 Å -1 is a characteristic feature only in superionic conducting glass.

A New Possibility of Dynamical Study on Solid State Ionic Materials by Inelastic Neutron Scattering

“…On the other hand, the data with small E i provides more detailed information in the lower Q range. Detailed investigation on the Q dependence of low-energy excitation in the solid state ionic materials will promote better understanding of peculiar dynamical properties presented by the previous experiments at the ISIS [1][2][3][4]. It is well known that the structure factor of superionic conducting glass exhibits a strong and relatively sharp diffraction peak at anomalously low values of Q (0.6 < Q < 0.8 Å -1 ) [14,15].…”

“…We can easily extract a series of constant Q or E slices and also the integration over the arbitrary Q or E ranges from S(Q,E) map. In fact, our previous works on superionic conductors using INS measurement with pulsed neutron source have given new insight into the origin of ionic conductivity in the solid state [1][2][3][4]. As an example, the comparison of low-energy dynamics between superionic conducting glass (AgI) 0.5 (AgPO 3 ) 0.5 and insulator glass AgPO 3 was * Corresponding author.…”

“…In this study, multi-Ei measurement is applied to the dynamical study of vitreous silica (v-SiO 2 ) which is the most famous isotropic material, and the availability of multi-Ei measurement in the dynamical study of solid state ionic materials is validated. [1]. All data were measured by MARI spectrometer at the ISIS facility, UK, and the environmental temperature was room temperature; (a) the energy dependence of S(Q,E) obtained by the total integration along the Q direction, and (b) the constant-E slices of S(Q,E) integrated between 1 meV and 3 meV.…”