Dielectric and piezoelectric properties of (1−x)(Bi1−yLiy)(Sc1−ySby)O3–xPbTiO3 high-temperature relaxor ferroelectric ceramics

Bi Sc O 3 – Li Sb O 3 – Pb Ti O 3 solid solutions with perovskite structure were prepared by the conventional mixed oxide method. X-ray diffraction showed that a change in symmetry from rhombohedral to tetragonal as the mole fraction of PbTiO3 larger than 62%. In the vicinity of the morphotropic phase boundary, the ceramics showed enhanced piezoelectric and ferroelectric properties: piezoelectric constant d33=545pC∕N, planar electromechanical coupling factors kp=58%, remnant polarization Pr=28.3μC∕cm2, and the coercive field Ec=1.8kV∕mm, respectively. The temperature of the permittivity maximum (Tmax) increased with increasing measure of frequency, over the range of 300–340°C, and the ceramics show the relaxor ferroelectric features.