Ionic Mobility and Electrical Transport in 45ZrF_4 · 35BiF_3 · 20MF (M - Li, Na, K) Glasses Studied by NMR and Impedance Spectroscopy

摘要

The ionic mobility and electrical transport in 45ZrF_4 · 35BiF_3 · 20MF (M - Li, Na, K) glasses havernbeen studied by ~7Li, ~(19)F, and ~(23)Na NMR and impedance spectroscopy at temperatures from 200 to 500 K. In the range 400-440 K, the main kinds of ionic mobility in these glasses are local motions of fluorine-containing groups and lithium ion diffusion. The temperature range where the dominant kind of ion motion in the glasses is fluoride ion diffusion depends on the nature of the M~+ cation. Above 470 K, the glasses offer rather high ionic conductivity: σ ≥ 10~(-5) S/cm.