Enhanced energy storage performance of eco-friendly BNT-based relaxor ferroelectric ceramics via polarization mismatch-reestablishment and viscous polymer process

Local Heterogeneous Polarization Enhanced Superior Low-Field Energy Storage Performance in Lead-Free Relaxor Ferroelectric Ceramics

“…A comparison of the discharge energy density ( W dis ), energy efficiency (η), maximum polarization ( P max ), and the difference between P max and remnant polarization ( P r ) of BB- x BN ceramics measured at 220 kV/cm is presented in Figure g, calculated from Figure S4, respectively, which further reveals the weakly coupled relaxor behavior and comprehensive excellent energy storage properties at low electric fields. As mentioned above, the discharge energy density is mainly dependent on the dielectric breakdown strength, which is highly related to the sample thickness. , Energy-electric-field ratio ( W dis / E ) is adopted as an indicator to better compare the field-independent energy storage properties, with the η- W dis / E relationship of recently reported work and BB-35NN ceramics in this work summarized in Figure d. ,− It can be seen that the high W dis / E , especially the ultrahigh η of BB-35NN ceramic is superior to the most recent work.…”

“…(a) P – E loops, (b) C – E loops, and (c) ∂P / ∂E – E loops of BB- x BN ceramics under the applied electric field of 100 kV/cm and at 1 Hz. (d) Comparison of the η- W dis /E among BB-35NN ceramics prepared in this work and other lead-free ceramics reported recently. ,− (e) P – E loops of BB- x BN ceramics measured at their own largest electric field before breakdown. (f) W dis and η as functions of the electric field of BB- x BN ceramics measured at 1 Hz.…”

Enhanced Energy Storage Properties in Lead-Free (Na0.5Bi0.5)0.7Sr0.3TiO3-Based Relaxor Ferroelectric Ceramics through a Cooperative Optimization Strategy

“…Although there is a marked secondary phase at 2θ angles of 28°−29°caused by Bi volatilization during high-temperature sintering, 45 the ceramics demonstrate a single perovskite structure with good ionic solid solubility for Na + and Nb 5+ . The magnified (110) peaks shown in Figure 3b shifted slightly to the left with increasing NN content because the larger radius Nb 5+ (64 pm) was substituted for the smaller radius Ti 4+ (60.5 pm), 46 which also increased the cell volume. The splitting of the (200) peaks indicates that the ceramics were not cubic, but rather had a coexistence of rhombohedral (R) and tetragonal (T) phases, as revealed by the Rietveld refinement of all ceramics, the results of which are presented in Table S1 and Figure 3c.…”

Achieving outstanding energy storage behaviors via combinatorial optimization design in BNT-based relaxor ferroelectric ceramics under medium–low electric fields

“…The lone electrons in the outer 5s orbitals of Nb 5+ and Na + can compensate for the polarization loss caused by relaxation. 13 In addition, the large bandgap of NN (∼3.58 eV) can enhance the insulation performance of the system, thus improving the E b . 14 Based on the above composition design, the 0.7BNT–0.2BZT–0.1NN ceramic exhibits weak local correlation but highly extendable unit polarization vectors, demonstrating high P max , extremely low P r and excellent energy storage performance.…”