(Bi0.5Na0.5)TiO3-based relaxor ferroelectrics with medium permittivity featuring enhanced energy-storage density and excellent thermal stability

Superior energy storage performance in (Bi0.5Na0.5)TiO3-based lead-free relaxor ferroelectrics for dielectric capacitor application via multiscale optimization design

“…The increase of the CT content can shi Raman peaks to lower wavenumbers and produce a reduction in the intensity, which is associated with the augmentation of structure disorder and decline of unit cell polarity. 16,19,20,43 As a result, the long-range ferroelectric order was broken and PNRs with a decreased size were induced with CT incorporation, 3,15 which will generate a high P m and a nearly negligible P r during the charging-discharging process. Temperature-dependent dielectric constant and loss for BNT-BAT-xCT ceramics at various frequencies are shown in Fig.…”

“…4(l)). 102,103 Overall, the number of grain boundaries plays a decisive role in increasing the breakdown strength of ferroelectric ceramics, 16,68 that is, more grain boundaries can greatly contribute to a higher dielectric breakdown strength for ferroelectric ceramics with smaller grain sizes.…”

“…Compared to linear dielectrics and ferroelectrics, relaxor antiferroelectrics (AFEs) and relaxor ferroelectrics (RFEs) exhibit great potential in the energy storage eld because of a good combination of large DP (P m À P r ), high h and E b . [16][17][18] Breakthroughs in ESP were recently achieved in lead-free relaxor AFEs including AgTa 0.55 Nb 0.45 O 3 (W rec $6.3 J cm À3 ) and 0.76NaNbO 3 -0.24BNT (W rec $12.2 J cm À3 ) by nanodomain engineering. 5,19 Yet, a relatively low h (large energy consumption) is still a common issue in AFEs because of the high polarization hysteresis caused by the eld-induced AFE-FE phase transition.…”

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

“…The peaks in the I – E curves decrease and four insignificant current peaks appear in each quadrant, which have a relationship with the reversible RE–FE transitions in relaxor ferroelectrics. 45 Fig. 7(b) reveals the P – E loops of the BNST- x LTN ceramics at 100 kV cm −1 .…”

“…After the introduction of LTN, the Z′ increases significantly, indicating the increased resistivity or descended conductivity of the ceramics.The I-E loops of the BNST-xLTN ceramics at 100 kV cm −1 are illustrated in Fig.7(a). The peaks in the I-E curves decrease and four insignificant current peaks appear in each quadrant, which have a relationship with the reversible RE-FE transitions in relaxor ferroelectrics 45. Fig.7(b) reveals the P-E loops of the BNST-xLTN ceramics at 100 kV cm −1 .…”