Crossover to Polydispersive Behavior in Dielectric Dispersion of Rb1-x[N(H1-xDy)4]x(H1_yDy)2PO4

Abstract

The onset temperature Tm and the Vogel-Fulcher temperature T0 were determined for the structural glass Rb1_x[N(H1_y;Dy)4]x(H1_yDy)2PO4 (x=0.5, y=0∼1.0) by the measurement of the complex dielectric constant. The values of Tm and T0 increase markedly with the deuteration rate.y. It is found that the polydispersive nature of the dielectric dispersion becomes appreciable below Tm. The breadth of the relaxation time distribution increases as temperature approaches T0.© 1991, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.