A STUDY OF HYDROTHERMAL SYNTHESIS AND PROPERTIES OF RARE EARTH-MODIFIED PBTIO3 FINE POWDERS

Lead titanate ceramics fine powders modified with several rare earth ( La, Pr, Nd, Sm, Eu) were prepared by hydrothermal method, The transfor mation between tetragonal (ferroelectric) phase and cubic (paraelectri c) phase for the La-doped PbTiO3 solid solution was investigated, Curi e' temperature of the PT solid solution with x(La)=0.04 and y(Mn) 0.01 was ca. 400 degrees C. The dependences between rare earth-doping cont ent and piezoelectric properties of PT solid solutions were determined . The d(33) increased, while g(33), k(t) and k(t)/k(p) decreased with increasing rare earth-doping content in PT solid solutions.