Crystallographic direction dependence of direct current field induced strain and phase transitions in Na_(0.5)Bi_(0.5)TiO_3-x%BaTiO_3 single crystals near the morphotropic phase boundary

摘要

The crystallographic dependence of the DC electric (E) field induced strain and phase transition in Na_(0.5)Bi_(0.5)TiO_3-5.6%BaTiO_3 (NBT-5.6%BT) single crystals has been investigated. An induced transition between pseudocubic and tetragonal structures was observed under E=10kV/cm for fields applied along the (001) direction, whereas an induced transition between pseudocubic and rhombohedral structures was observed when the E-field was applied along (111). Our results show near the morphotropic phase boundary that the phase stability of NBT-x%BT is dependent on the crystallographic direction along which E was applied.