Phase structure and defect engineering in (Bi0.5Na0.5)TiO3-based relaxor antiferroelectrics toward excellent energy storage performance

Superior Energy Storage Capability and Stability in Lead‐Free Relaxors for Dielectric Capacitors Utilizing Nanoscale Polarization Heterogeneous Regions

“…Third, the achieved nanoscale polarization heterogeneous regions with multiphase coexistence are supposed to be beneficial to maintaining high polarization strength and generating delayed polarization saturation of the material. [ 7,24,60 ] Compared to the domain structures recently reported in BNT, BKT, BF, and NN systems, [ 15,20,23,31,42 ] our designed novel RFE system has a much smaller domain size, as shown in Figure 3(c–f), hence allowing for easier domain switching and domain boundary motion, i.e., polarization reversal and extension. The high‐efficient capacitive energy storage is therefore realized in as‐designed lead‐free relaxors due to the synergistic functions of linear dielectric and nanoscale polarization heterogeneous regions, which enhances E b and holds high P m accompanied with negligible P r, contributing to the application in the field of energy storage capacitors.…”

Ultrahigh energy storage density, high efficiency and superior thermal stability in Bi0.5Na0.5TiO3-based relaxor ferroelectric ceramicsviaconstructing multiphase structures

“…2(a-e). 9,14,22,23 And the relatively low reliability factors shown in Table S1 † suggest that the renement results are dependable. Aer incorporating BSZS, the phase structure of ceramics transforms from R3c into the coexistence of R3c and P4bm.…”

“…Fig. 4(a) shows the tting results of Weibull distribution analysis using the equations: 14,26 X i = ln(E i ), where i and n are the ordinal and total number of samples, E i is the specic electric breakdown strength. The linear tting results with a slope b (i.e., shape parameter) more than 8 (Table S2 †) demonstrate the high reliability of Weibull distribution analysis.…”

“…One is T s corresponding to the temperature for the thermal relaxation of PNRs with a rhombohedral (space group: R3c) and tetragonal (space group: P4bm) phase structure, and another is T m corresponding to the transformation of PNRs from R3c into P4bm and the thermal evolution of PNRs with P4bm. 8,[12][13][14][15] When the temperature is below T s , the R3c phase structure is dominated for BNT-based ceramics with large and strongly coupled PNRs, which is easy to irreversibly grow into macroscopic ferroelectric domains upon applying an electric eld, resulting in saturated P-E loops and unsatisfactory energy storage performances (Fig. 1(b)).…”

Regulating local electric field to optimize the energy storage performance of antiferroelectric ceramics via a composite strategy

“…Shifting the phase transition points (E F and E A ) toward higher electric fields could also contribute to the increase of W rec . For instance, relaxor behavior and enhanced AFE characteristic were realized through designing a (1-x)Bi 0.5 Na 0.5 TiO 3 -xAgNb 0.5 Ta 0.5 O 3 (100xANT) relaxor AFEs, resulting in an increase in W rec from 2.2 to ~5.0 J•cm -3 [12]. The aliovalent A-site Sm modification of AgNbO 3 -based can alter the crystal structure and enhance the interaction among the ions by affecting the electronic structure, leading to enhanced antiferroelectricity [13].…”