Effects of poling field on the dielectric and piezoelectric properties of Cd additive Sm-modified PbTiO₃ ceramics

(Pb_0.85-xCd_xSm_0.1)(Ti_0.98Mn _0.02)O₃; x=0.01-0.08 ceramics were prepared by conventional mixed-oxide technique using sintering temperature at 1150 °C and poling field at 0-70 kV/cm. Microstructural and compositional analyses of these doped ceramics have been carried out using X-ray diffractometer (XRD) and scanning electron microscope (SEM). The effects of the poling field on the dielectric and piezoelectric properties of Cd additive Sm-modified PbTiO₃ ceramics have been investigated. We successfully showed that the thickness electromechanical coupling coefficient, k_t, of the Cd additive samples is larger than 0.54 as poling field higher than 40 kV/cm, and still keep small planar electromechanical coupling coefficient, k_p.