Lead-free antiferroelectric niobates AgNbO₃ and NaNbO₃ for energy storage applications

Abstract

Antiferroelectric materials are attractive for energy storage applications and are becoming increasingly important for power electronics. Lead-free silver niobate (AgNbO3) and sodium niobate (NaNbO3) antiferroelectric ceramics have reviced intensive interests...

Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

“… 343 Recent research on AN ceramics has focused on stabilizing the AFE phase so that switching field is moved to higher fields while simultaneously optimizing P max . 344 , 345 …”

“…Thus, AFE behavior in NN based materials is commonly stabilized by chemical substitution with end members such as BS and CaHfO 3 . 344 , 368 − 370 …”

NaNbO3‐(Bi0.5Li0.5)TiO3 Lead‐Free Relaxor Ferroelectric Capacitors with Superior Energy‐Storage Performances via Multiple Synergistic Design

“…[5][6][7][8][9][10] As shown in Figure 1a, ultrahigh W rec values have been achieved in NaNbO 3 (NN) and AgNbO 3 (AN)-based lead-free AFE ceramics through introducing relaxor behavior, yet the large polarization hysteresis from the inevitable field-induced AFE-FE phase transition leads to low η values. [7,[11][12][13][14][15][16] Owing to the extremely low energy loss, lead-free relaxor FE ceramics based on BaTiO 3 (BT), (Na 0.5 Bi 0.5 ) TiO 3 (BNT), BiFeO 3 (BF), and (K 0.5 Na 0.5 )NbO 3 (KNN), etc., have been actively studied in the last few years. [3,[8][9][10][17][18][19][20][21][22][23][24][25][26][27][28][29] Nevertheless, the obtained W rec values are generally lower than 5 J cm -3 together with η values >80%.…”

“…NN shows a wider band gap (E g ) than other lead-free perovskites, meaning a higher E B can be obtained, which has been proved in NN-based AFE energy-storage ceramics. [12][13][14] By comparison, NN-based relaxor FE ceramics have been rarely investigated for the energy-storage applications although both AFE and FE phases in NN can be stabilized near room temperature through chemical modification. [12][13][14][29][30][31][32][33][34] In the limited reports, W rec values low than 4 J cm -3 were obtained even under high E B up to ≈52 kV mm -1 .…”

“…[12][13][14] By comparison, NN-based relaxor FE ceramics have been rarely investigated for the energy-storage applications although both AFE and FE phases in NN can be stabilized near room temperature through chemical modification. [12][13][14][29][30][31][32][33][34] In the limited reports, W rec values low than 4 J cm -3 were obtained even under high E B up to ≈52 kV mm -1 . [29,32,33] To realize good comprehensive energy-storage performances for practical applications, 0.68NN-0.32(Bi 0.5 Li 0.5 )TiO 3 (0.68NN-0.32BLT) relaxor FE ceramics were especially designed in this work, where BLT was added to stabilize the FE phase.…”