Extrinsic permittivity in domain engineered rhombohedral BaTiO_3 monocrystal

摘要

Arrangement of 90-degree domain walls in the domain structure of the 111 (pc)-oriented single crystal plates of BaTiO3 was intentionally modified by combinations of in-plane and out-of-plane steady state electric poling at ambient temperature. It is shown that the annealed, in-plane, and out-of-plane poled samples exhibit markedly different dielectric properties at low temperatures. The difference in low-temperature permittivity behavior is enhanced by the out-of-plane fast-decayed bipolar electric pulse treatment, but the efficiency of this enhancement is strongly dependent on the initial domain structure. The absence of a clear signature of the pulse treatment in optical observations of the domain structure suggests that it might involve mostly changes in the 180-degree domain wall subsystem. Published by AIP Publishing.