Abstract
Abstract Low-frequency studies of the complex dielectric permittivity of Cd2Nb2O7 single crystals in the temperature range of 4–80 K are reported. Above Tcom ≃ 46 K an anomalous thermal hysteresis of ∊′ over the frequency range of 10 kHz-2 MHz as well as dielectric relaxation may be related to the existence of discommensurations and their dynamics. In the vicinity of Tf ≃ 18 K the temperature and frequency behavior of ∊∗ is typical of orientational glasses. Two relaxation process fitted with the Vogel-Fulcher law and the Arrhenius law take place near Tf. The first process is related to frustration in displacements of the “;seventh”; oxygens relative to Cd2+ ions and is characterized by freezing in of Cd-0(7) orientations below T0 ≃ 7 K. The Arrhenius-type process is related to relaxation of ferroelastic and ferroelectric domain walls.
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