A new family of sodium niobate-based dielectrics for electrical energy storage applications

Effects of CuO Sintering Aids on Microstructure and Electric Properties for (Na0.48K0.473Li0.04Sr0.007) (Nb0.883Ta0.05Sb0.06Ti0.007)O3 Ceramics

“…(5) When the amounts of CuO additives are high than 1 mol%, the P r values are contrary decreased with increasing the amounts of CuO additives shown in Figure 6b because of the less densification as mentioned in Section 3.2 and the more pinning effect by the pairs of Cu 2+ ions and oxygen vacancies [5,6,20,21]. In conclusion, the maximum remnant polarization P r = 18.93 µC/cm 2 and minimum coercive electric field E C = 8.75 kV/cm are obtained with a good piezoelectricity at 1 mol% CuO additives since there are the largest spontaneous polarizations and easily rotated under poling processing [36,37]. Figure 7 shows the piezoelectric properties (kp, Qm, d33 and g33) of the NKLNTS-ST-xCuO ceramics.…”

Boosting energy storage performance of BiFeO3-based multilayer capacitors via enhancing ionic bonding and relaxor behavior

“…To further verify the relaxor behavior, the Curie–Weiss law, 40 as shown in eqn (7), was employed to calculate the diffuseness degree ( γ ), which varies from 1 (normal ferroelectric) to 2 (typical relaxor ferroelectric). 41 The γ values for BF-BT- x NT capacitors at x = 0.05 and 0.08, as shown in Fig.…”

High Capacitive Performance Achieved in NaNbO3‐Based Ceramics via Grain Refinement and Relaxation Enhancement

“…This phenomenon demonstrates that more and more long-range polar FE orders are disrupted into fragmented short-range polar states with the increase in BST content, which might be due to the local random field generated by the ion random distribution and charge imbalances. [43,56] Figure 3c reveals the unipolar P-E loops of the (1-x)NN-xBST ceramics and Figure 3d exhibits the variations of W rec and η with different BST contents under 120 kV cm À1 . As can be seen, the W rec increases from 0.47 J cm À3 for x ¼ 0.10 to 0.90 J cm À3 for x ¼ 0.20 and then decreases to 0.65 J cm À3 for x ¼ 0.40, while the corresponding η increases from 57.75% to 94.16% and then decreases to 85.70%.…”

“…[42] Yang et al reported a high W rec % 1.50 J cm À3 and a η % 68.2% in the BaTiO 3 -modified NaNbO 3 -based ceramics. [43] Especially, remarkable W rec % 12.2 J cm À3 with moderate η % 69% was achieved in the 0.76NaNbO 3 -0.24(Bi 0.5 Na 0.5 )TiO 3 AFE relaxor ceramic by Qi et al [44] However, it seems difficult to obtain giant recoverable energy storage density and high efficiency by these procedures concurrently.…”