Chemical composition of dielectric and piezoelectric properties for BaTiO_3-Bi(Mg_(1/2)Ti_(1/2))O_3-BiFeO_3 system ceramics.

摘要

(1-x-y)BaTiO_3-xBi(Mg_(1/2)Ti_(1/2))O_3-yBiFeO_3 ceramics were prepared by a conventional solid-state synthesis, and crystal structure and electric properties were investigated. Synchrotron X-ray diffraction pattern revealed that a single perovskite phase was obtained for samples at x=0.05-0.15, y=0.46.5-73.5. Splitting of the (111) peak was observed when (x, y) = (0.050,0.685) and (0.050, 0.735) indicating that crystal structure of samples changed from a pseudo-cubic phase to a rhombohedral phase with increasing BF. As the BF content increased, the Curie temperature increased. The largest maximum strain (S_(max)) over the applied maximum electric field (E_(max)value (S_(max)/E_(max)) of 300 pm/V was observed for 0.365BT-0.050BMT-0.585BF at 25 °C and 1Hz with the Curie temperature of 390 °C.