Enhanced energy storage properties and dielectric stabilities in BNT-based ceramics via multiphase and dielectric peak broadening engineering

Simultaneously enhanced energy density and discharge efficiency of (Na0.5Bi0.5)0.7Sr0.3TiO3-La1/3(Ta0.5Nb0.5)O3 lead-free energy storage ceramics via grain inhibition and dielectric peak flattening engineering

“…Generally, the Weibull distribution is widely used to evaluate the breakdown strength of dielectric materials. 14 The ceramics are sorted according to the ascending sequence of DBS values: E 1 < E 2 < E 3 < ... < E i < ... < E n and the formulas are described as follows: P = i /( n + 1), X i = ln( E i ), Y i = ln(−ln(1 − P )) and β = Y i / X i , where β presents the slope of the fitted line, i is the sequence number of the sample, n is the sum of i and E is just another means of expression of the dielectric breakdown strength, separately. 29 When the β value is greater than 8, the reliability of the Weibull analysis is proved.…”

“…Bi 0.5 Na 0.5 TiO 3 (BNT), as a typical A-site complex perovskite ferroelectric, has attracted tremendous attention due to its large P s (>40 μC cm −2 ) induced by the forceful hybridizations of Bi 3+ and O 2− orbitals. 13,14 However, the low efficiency caused by the large P r limits the actual application of BNT-based ferroelectrics. 1 Commonly, forming multivariate solid solution systems is a feasible modification approach for BNT-based ceramics to obtain relatively superior ESP, such as (1 − x )Bi 0.5 Na 0.5 TiO 3 - x BaTiO 3 , 15–17 (1 − x )Bi 0.5 Na 0.5 TiO 3 - x NaNbO 3 , 18,19 (1 − x )Bi 0.5 Na 0.5 TiO 3 - x CaTiO 3 20,21 and (1 − x )Bi 0.5 Na 0.5 TiO 3 - x SrTiO 3 (BNT-ST).…”

Energy‐storage properties of (0.7Bi0.65Na0.35Fe0.3Ti0.7O3–0.3Sr0.85Bi0.1TiO3)–NaTaO3 relaxor under low electric fields

“…By comparing the W rec values under a unit electric field, the quality of energy‐storage properties under a specific electric field is evaluated 20 . This result illustrates that under the low electric field ( E = 200 kV/cm), W rec and η of 9NT are better than most typical reported systems 16,21–46 …”

“…Comparison of energy‐storage performance between 9NT ceramics and other lead‐free dielectric ceramics under unit electric field 16,21–46 …”

The energy storage performance of Sm3+ and Hf4+ co-doped AgNbO3 lead-free antiferroelectric ceramic

“…By introducing the BaTiO 3 -based compounds to tailor the relaxation behavior and domain structure of BiFeO 3 ceramics, Guo et al obtained a W rec of 2.11 J cm −3 in 0.56BiFeO 3 -0.30BaTiO 3 -0.14AgNbO 3 ceramics under 195 kV cm −1 [22]. Additionally, large W rec values driven by moderate electric fields were also obtained in (Bi 0.5 Na 0.5 )TiO 3 -based [23][24][25][26] and (K 0.5 Na 0.5 )NbO 3 -based [27] ceramics. Notably, another lead-free antiferroelectric material, AgNbO 3 , has also been widely studied due to its unique double P−E hysteresis loops, with characteristics of large P max in high-field ferroelectric (FE) phase and tiny P r in low-field antiferroelectric (AFE) phase [28,29], which contributes to a large W rec .…”