Abstract
Dielectric ceramic capacitors have been extensively investigated in electronic and high-power electrical systems due to their high-power density, fast charge-discharge rates, brilliant fatigue endurance, and good high-temperature stability. In this study, the dielectric and energy-storage performance of [(Bi0.5Na0.5)TiO3](1-x) –[Ba(Ni0.5Nb0.5)O3]x (x = 0, 0.02, 0.03, 0.04, 0.05, and 0.06) relaxor ferroelectric ceramics were investigated as a function of electric field and temperature. The splitting of (200) reflections in the XRD pattern confirmed the rhombohedral phase with R3c symmetry of all samples. The scanning electron microscopy confirmed that the average grain size gradually increased with doping. The introduction of BNN reduced the temperature of the ferroelectric-antiferroelectric phase transition (Td) and antiferroelectric - paraelectric phase and enhanced the relaxor behavior of BNT ceramics. The value of the recoverable energy density (Wrec) and efficiency (η) increased from 0.049 J/cm3 to 0.627 J/cm3 and 2.13%–61.71% with an increase of x from 0 to 0.06. Further, the Wrec values also showed temperature stability with a variation of less than 8% in the range RT-383 K. Hence, the substitution of BNN in BNT positively affects the overall properties and makes it a promising candidate for energy storage application with superior thermal stability.
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