High-permittivity ionic glass predicted from mode-coupling calculations

Dielectric constants in the glassy state of various ionic mixtures have bee n calculated from mode-coupling theory. The glass is modeled on a binary sy stem of charged hard spheres and its static structure is treated within mea n-spherical approximation. The permittiviry of each model system is found t o vary strongly along the glass-fluid phase boundary in the density-tempera ture plane. Maximum values as high as epsilon approximate to 4 X 10(3) are predicted for the critical permittivity at intermediate packing fractions ( 0.1 < eta < 0.3). Changes in the maximum dielectric constant by more than t wo orders of magnitude are found for the various ionic mixtures investigate d, which differ in size and charge ratio. [S0163-1829(99)05738-0].