Flux Growth and Dielectric Properties of Relaxor-Based Pb(In_(1/2)Nb_(1/2))O_3-PbTiO_3 Single Crystals

摘要

Relaxor-based piezoelectric single crystals of lead indium niobate-lead titanate (0.63Pb(In_(1/2)Nb_(1/2))-0.37PbTiO_3, abbreviated as PIN-PT), in the vicinity of the morphotropic phase boundary, were prepared by a flux method. The compositions of the flux, Pb_3O_4 or PbF_2, play different role in perovskite stability and phase development. Thus, pure perovskite PIN-PT single crystals with the size of 2～5 mm were obtained by using Pb_3O_4 flux as well as a small amount of B_2O_3 additive. The microstructure and the phase development of the as-grown single crystals were investigated by scanning electron microscopy and transmission electron microscopy and X-ray diffraction. Furthermore, the dielectric properties of the <100>-oriented PIN-PT single crystals were measured in the temperature range between 20°C and 400°C.