0000000000246804
AUTHOR
Domingos De Sousa Meneses
Evidence for a glassy dynamics in (Rb-NH 4 ) 2 SO 4 mixed compounds
An orientational glass behavior is evidenced in a [Rb0.7(NH4)0.3]2SO4 mixed crystal. Dielectric experiments (1 kHz–250 MHz) performed along the c-axis evidenced a polydispersive relaxation process. Its temperature dependence follows a Vogel-Fulcher law with a freezing temperature of 12 K.
Ferroelectricity and orientational glass behavior in the [Rbx(NH4)1−x]2SO4system
Abstract The ordering in the electric dipole subsystem of the [Rbx(NH4)1−x]22SO4 family is investigated. The microscopic origin of ferroelectricity for x=0 is discussed, and evidences for the existence of orientational glass behavior in highly substituted crystals are presented.