c/ a Ratio-Dependent Energy-Storage Density in (0.9−x) Bi0.5Na0.5TiO3-xBaTiO3-0.1K0.5Na0.5NbO3 Ceramics.

The (0.9−x) Bi0.5Na0.5TiO3-xBaTiO3-0.1K0.5Na0.5NbO3 [ BNBKN(x), x = 0.060, 0.063, 0.066, and 0.069] ceramics were fabricated by the conventional sintering technique. The P- E hysteresis loops measured under 5 kV/mm at room temperature show that the BNBKN(0.063) ceramics obtain the maximum ( Ps− Pr) value of 20.6 μC/cm2 and the largest energy-storage density W of 0.424 J/cm3. In addition, calculation from the X-ray diffraction results shows that the BNBKN(0.063) ceramics are featured with the largest c/ a ratio of 0.70887. The W is observed to increase with the increase of the c/ a ratio in the BNBKN( x) ceramics. The c/ a ratio can be regarded as a significant factor for W in the BNBKN( x) ceramics. [ABSTRACT FROM AUTHOR]