Research on effects of hydrostatic pressure on the dielectric property of Pb(Zn_1/3Nb_2/3)O₃ -BaTiO₃-PbTiO₃ relaxor ferroelectric ceramics

The dielectric properties of Pb(Zn_1/3Nb_2/3)O₃- BaTiO₃-PbTiO₃ relaxor ferroelectric ceramics near the rhombohedral and tetragonal phase boundary were investigated under hydrostatic pressure. It was found that hydrostatic pressure made their phase transition temperature T_c and the peak temperature T_m decreased, and the frequency dispersion and relaxor behavior enhanced. In these disorder systems of composite pervoskite structures, there appeared polar clusters or nanodomains. The unique physical characteristics, which made the relaxor behavior enhanced, is that the correlation length among these nanodo-mains decreases greatly with the pressure increasing.