Abstract
(1-x)[0.94Bi(0.5)Na(0.5)TiO(3 )- 0.06BaTiO(3)]-xLa(0.33)NbO(3 )(x=0, 0.02, 0.04, 0.06, 0.08, 0.10) (BNBT-LN) bulk lead-free relaxor ferroelectric ceramics were synthesized via solid-state sintering method. Phase, microstructure and energy storage properties were determined. The X-ray diffraction (XRD) revealed a single perovskite phase for compositions of x <= 0.02, while the second phase of Bi(2)Ti(2)O(7 )along with the parent phase for x >= 0.04. Dense microstructure with a decrease in grain size has been achieved via LN doping. The addition of LN decreased the remnant polarization (P-r), and coercive field (E-c), while increased the difference between the maximum polarization (P-max) and remnant polarization (P-r). The high energy-storage density of 2.96 J/cm (3) and high recoverable energy density of 1.66 J/cm(3) at a breakdown electric field of 214 kV/cm were achieved for the composition of x = 0.02 with good temperature stability satisfying the condition of Delta epsilon (r) /epsilon (r200 degrees C)<= +/- 15% in a working temperature range of 70 degrees C to 400 degrees C. Similarly, a less discharge time of<4 s achieved in this study for x = 0.02. These results demonstrate that this material may be a good candidate material for power pulsed applications.