Correlated domain model of deuterated dipole glass

Abstract

The low-frequency dielectric relaxation of the deuterated rubidium ammonium dihydrogen phosphate (DRADP) dipole glass was investigated by examining the complex dielectric permittivity above the glass freezing temperature. We show that none of the well-known Debye-type relaxation functions that include the Cole-Cole, Cole-Davidson, and Kohlrausch-Williams-Watts functions adequately describe the observed dielectric relaxation behavior of the DRADP. We then examine the Chamberlin's correlated domain model as a possible description of the DRADP dipole glass. The experimental data and the computational results based on the correlated domain model qualitatively agree with each other with common features of (i) a long tail at the lower-frequency side and (ii) increase in the asymmetry of epsilon "(omega) spectrum with decreasing temperature. Finally, we discuss the fitting results of the DRADP dipole glass in comparison with glass-forming liquids and other polar glasslike systems. [S0163-1829(99)03034-9].