Crystal Growth of the Relaxor typed Ferroelectrics single crystal and Observation of the multi-ferroelectric domains

点击翻译按钮获取中文摘要

Lead-based relaxor ferroelectric single crystal solid solutions, such as a Pb(Zn_<1/3>Nb_<2/3>)O_3 -PbTiO_3 binary system, with compositions near the morphotropic phase boundary(MPB) have attracted considerable attention for several applications in higher-performance actuators, and ultrasonic devices, making use of their superior piezoelectric properties. From the view of the environmental protection, We have selected the lead-free ferroelectric sodium bismuth titanate (Na_<1/2>Bi_<1/2>)TiO_3-BaTiO_3 (NBT-BT) which has very excellent electromechanical properties, and trid to grow the solid solution single crystals of NBT-BT by the Bridgman methods. The domain observation of NBT-BT by using the polarizing microscope, nano-domain observation and piezoresponse in nanoscale regions by using piezoresponse force microscopy (PFM), measurement of dielectric permittivity, P-E hysteresis measurement with improved Sawyer-Tower circuit, were extensively investigated for NBT-BT relaxor ferroelectrics.