Enhanced energy density and discharged efficiency of lead-free relaxor (1-x)[(Bi0.5Na0.5)0.94Ba0.06]0.98La0.02TiO3-xKNb0.6Ta0.4O3 ceramic capacitors

Achieving Enhanced Energy‐Storage Performances in Bi0.5(K0.15Na0.85)0.5TiO3 Ceramics Modified by Sr(Ti0.85Zr0.15)O3

“…The slimmer loops are obtained, and the P max and P r decrease as x increases (Figure 5e), indicating the interruption of ferroelectric order and the inducing of weakly polar phase. [ 8,9 ] The presence of a slim hysteresis loop is mainly attributed to the increased relaxor behavior. Moreover, the slim P – E loop is related to the formation of polar nanodomains.…”

“…Both the slimmer hysteresis loop and flat I – E loop are related to the generation of nanodomains. [ 8,15 ]…”

“…A similar result was reported in the literature. [8,9,19] Figure 2 presents the SEM image for (1 À x)BKNT-xSTZ (x ¼ 0.1, 0.2, 0.3, and 0.4). All the sintered samples show visible grain boundaries and the grain size is an obvious difference.…”

“…[(Bi 0.5 Na 0.5 ) 0.94 Ba 0.06 ] 0.98 La 0.02 TiO 3 modified by KNb 0.6 Ta 0.4 O 3 showed high η (92.9%) and W re (2.1 J cm −3 ) at 170 kV cm −1 . [ 8 ] A high W re (3.60 J cm −3 ) with high ( η ≈ 74.2%) was obtained in LaBiO 3 ‐modified K 0.5 Na 0.5 NbO 3 ceramic. [ 14 ] SrTiO 3 has large breakdown strength and very small P r , which can be introduced into ferroelectric material to form solid solutions, [ 15 ] and improved energy properties were realized.…”

“…Dielectric materials such as BaTiO 3 -based materials and (Bi 0.5 Na 0.5 )TiO 3 -based materials with large P max have been developed for energy storage. [8][9][10][11][12][13] However, their high P r and low breakdown strength result in low energy properties. Many other materials have been added to these materials to form solid solutions, which can further improve the energy performances of these materials, such as Bi(Mg 1/2 Zr 1/2 )O 3-modified BaTiO 3based ceramic, [9] which showed large W re (1.25 J cm À3 ) and high (η % 95%) at 185 kV cm À1 .…”