High energy storage efficiency and high electrostrictive coefficients in BNT-BS-xBT ferroelectric ceramics

(1 - x)[0.9(Bi0.5Na0.5)TiO3-0.1BiScO(3)]-xBaTiO(3) (BNT-BS-xBT) ceramics are prepared by the traditional solid-state sintering. The structure, morphology, ferroelectricity, strain, energy storage, dielectricity, and impedance of the BNT-BS-xBT ceramics are investigated. XRD shows that all ceramics have pseudo-cubic structures. The results also show that BT can refine the grain size of the ceramics and reduce the corresponding density. At x = 0.20, the energy storage performance of the ceramics is optimum (W-rec = 0.563 J/cm(3), eta = 63%). At x = 0.10, the electrostriction coefficient (Q(33)) of the ceramics reaches 2.72325 x 10(-2) m(4)/C-2. Dielectric and impedance spectroscopies show that the ceramics are relaxor ferroelectrics and have good insulation properties.