Realizing high energy density and efficiency simultaneously in (Bi_0.5Na_0.5)_0.7Sr_0.3TiO₃-based ceramics via introducing linear dielectric CaTiO₃

Abstract

Modern electronics and electrical power systems require a high energy storage density (Wrec) and a large efficiency () to deliver high performances. Although dielectric capacitors have been extensively explored owing...

A novel lead‐free relaxor with endotaxial nanostructures for capacitive energy storage

“…As presented in Figure 6B, the unipolar P – E loop retains a slender shape, and the rate of change of W rec is less than ≤6.5%. Figure 6C compares the W rec of SMT3 ceramics with other representative lead‐free dielectric systems reported recently 24,39–46 . Obviously, the SMT3 ceramics not only possess a high W rec but also exhibit outstanding temperature stability, indicating the potential advantages of lead‐free ceramics with ENs in high‐temperature applications.…”

Giant comprehensive capacitive energy storage in lead-free quasi-linear relaxor ferroelectrics via local heterogeneous polarization configuration

“…As presented in Fig. 5(c) and (d), the shiing of Raman peaks toward lower wavenumbers and the increased FWHM (full widths at half-maximum) for n 1 and n 5 modes disclose the reinforced local structural disorder and anharmonic effects of the lattices with the addition of NN, 53 which conrms the enhanced relaxor behavior. That is, the original linear dielectric state is disturbed and the PNRs with small size and fast polarization response are induced with the assistance of NN.…”

“…3(e), in which a nearly parabolic growth trend with electric fields is observed. 22,53 Evidently, the η values show strong electric field-insensitive behavior, which remains at a high level of ≥93% over the whole measuring electric field. Further increasing the electric field generates a slightly increasing trend in η , being mainly associated with the high field-induced orientation and growth of disordered nanodomains.…”

“…22 Unlike reported RFEs with relatively large-size domains, the designed ceramic with a large number of weak polar PNRs possesses the extreme difficulty of gaining longrange dipole orientation at relatively low electric elds, yielding delayed polarization saturation. 53 Moreover, delayed polarization saturation can also be effectively contributed by a suitable room temperature dielectric constant (∼187) controlled by quasi-linear RFE design. In a word, the construction of local heterogeneous polarization conguration produces almost hysteresis-free P-E loops with an ultra-small slope for the designed quasi-linear RFEs.…”

“…22 Unlike reported RFEs with relatively large-size domains, the designed ceramic with a large number of weak polar PNRs possesses the extreme difficulty of gaining long-range dipole orientation at relatively low electric fields, yielding delayed polarization saturation. 53…”