Preparation and temperature dependence of electrostriction properties for PMN-based composite ceramics

Both low- and high-temperature units were prepared by columbite precursor method, and Pb(Mg_1/3Nb_2/3)O₃(PMN)-based ferroelectric composite ceramics were prepared by conventional method, baking-block method and coating method, respectively. The effects of preparation methods on dielectric and electrostriction properties as well as the temperature-dependence property of the obtained composite ceramics were studied. The results show that compared with the samples prepared by traditional blend sintering method, of the samples prepared by baking-block and coating methods have much better dielectric and electrostriction properties. For those prepared by baking-block method, the electrostriction temperature-dependence properties are good in the range of 20-60 °C. For those prepared by coating method, the dielectric temperature-dependence properties are also good in the broad range of -30 to 70 °C, and the electrostriction temperature properties are better than those prepared by blending-block. Compared with the traditional blending sintering method, the dielectric and electrostriction temperature-dependence properties are much better, which effectively solves the problem of temperature properties existing in present engineering applications.