Dielectric relaxor behavior of Cd_(2)Nb_(2)O_(7)

摘要

The de electric-field dependence of the dielectric properties of cadmium niobate Cd_(2)Nb_(2)O_(7) single crystals is studied, and characteristics of the dielectric behavior of Cd_(2)Nb_(2)O_(7) under dc bias are revealed. The temperature (T_(m)) where the dielectric relaxation mode occurs is independent of dc bias levels, while its intensity is greatly suppressed and finally eliminated with increasing dc bias from 0 to 15 kV/cm. The observed dielectric relaxation features of Cd_(2)Nb_(2)O_(7) can be attributed to "dielectric relaxor" behavior, rather than "ferroelectric relaxor" behavior previously designated in literature. The physical nature of the dielectric relaxor behavior is briefly discussed.