稀土改性钛酸铅微粉的水热合成及其性能研究

A Study of Hydrothermal Synthesis and Properties of Rare Earth-modified PbTiO_3 Fine Powders

用水热法合成了几种稀土（La，Pr，Nd，Sin，Eu）和锰掺杂改性的钛酸铅（PbTiO3，简称PT）陶瓷微粉．研究了掺La和Mn的PT固溶体的四方（铁电）相与立方（顺电）相之间的相变，掺杂La（x（La）=0·04）和Mn（y（Mn）=0．o1）的PT固溶体的居里温度大约为400℃．测定了稀土掺杂量（x=0．04～0．08）与其压电性能之间的关系．随La掺杂量的增加，PT固溶体的d33增大，g33、Kt及机电耦合各向异性kt／kp值下降；其它稀土也有类似情况，

Lead titanate ceramics fine powders modified with several rare earth (La, Pr, Nd,Sin, Eu) were prepared by hydrothermal method. The transformation between tetragonal(ferroelectric) phase and cubic (paraelectric) phase for the La-doped PbTiO3 solid solutionwas investigated. Curie' temperature of the PT solid solution with x(La) =0. 04 and y(Mn)= 0. 01 was ca. 400 ℃. The dependences between rare earth-doping content and piezoelectricproperties of PT solid solutions were determined. The d33,, increased, while g33, kt and kt/kpecreased with increasing rare earth-doping content in PT solid solutions.