Abstract
The development in field of hybrid vehicles, telecommunication and energy sectors require dielectric materials having high-energy storage density with optimum thermal stability to operate in certain environment. To fulfil such requirement a new set of materials along the ternary solid solutions of 0.92Bi(0.5(1-x))-La(x)Na0.5TiO3 -0.06Ba(Zr0.2Ti0.8)O-3-0.02NaNbO(3) (NB1-xLxT-BZT-NN) (x = 0, 0.03, 0.05, 0.07) were fabricated through solid-state mix oxide route. The XRD patterns analysis confirmed a structural phase transformation from rhombohedral to the tetragonal-P4bm phase when x content increased from 0 to 0.07. The SEM study revealed, dense microstructure for all ceramics accompanied by a decrease in the average grain from 1.66 mu m to 1.05 mu m leading to high densities for these materials with an increase in the x content. The dielectric breakdown field increased from similar to 115 to 137 kV cm(-1) resulting in an increase in recoverable energy density from similar to 0.68 to 1.14 J cm(-3) with the increase in x content. Furthermore, excellent temperature stability (+/- 15%) in dielectric permittivity was observed in a wide temperature range for each ceramic. In the present study, a recoverable energy density of 1.14 J cm(-3) along with an efficiency of 70.6% was obtained for the composition of x = 0.07.