Enhanced energy-storage performance and temperature-stable dielectric properties of (1 − x)(0.94Na0.5Bi0.5TiO3–0.06BaTiO3)–xNa0.73Bi0.09NbO3 ceramics

Electrical and Magnetoelectric Properties of Particulate Composites and Laminated Trilayered Thick‐Film Composites

“…The variation of dielectric constant with temperature is explained by the contribution of electric dipoles to polarization, that is, at low temperatures, the contribution of electric dipoles to polarization is very weak, resulting in a low dielectric constant, whereas, at high temperatures, electric dipoles have enough thermal energy to follow changes in the external field enhancing space charge polarization, thus increasing the dielectric constant. [ 26 ]…”

“…The variation of dielectric constant with temperature is explained by the contribution of electric dipoles to polarization, that is, at low temperatures, the contribution of electric dipoles to polarization is very weak, resulting in a low dielectric constant, whereas, at high temperatures, electric dipoles have enough thermal energy to follow changes in the external field enhancing space charge polarization, thus increasing the dielectric constant. [26] Figure 7 depicts the variation in DC resistivity with temperature for particulate composites and laminated thick-film composites. The figure shows that all samples exhibit semiconducting behavior and DC resistivity decreases with increasing temperature for both particulate composites of CuFe 2 O 4 -PZT and laminated thick films of CuFe 2 O 4 /PZT/CuFe 2 O 4 and PZT/CuFe 2 O 4 / PZT.…”

“…The dielectric constant of CuFe 2 O 4 /PZT/ CuFe 2 O 4 film composites increases slightly with increasing temperature, and an absorption peak can be observed at around 543 K, whereas the dielectric constant of PZT/CuFe 2 O 4 /PZT increases slightly with increasing temperature. The variation of dielectric constant with temperature is explained by the contribution of electric dipoles to polarization, that is, at low temperatures, the contribution of electric dipoles to polarization is very weak, resulting in a low dielectric constant, whereas, at high temperatures, electric dipoles have enough thermal energy to follow changes in the external field enhancing space charge polarization, thus increasing the dielectric constant [26]. Figure7depicts the variation in DC resistivity with temperature for particulate composites and laminated thick-film composites.…”

Are lead-free relaxor ferroelectric materials the most promising candidates for energy storage capacitors?

“…As a consequence, a nearly hysteresis-free polarization response was observed in PNRs based systems [114]. To further improve the W r of BNT ceramics by inducing relaxor behavior, new types of dopants and binary/ternary solutions strategies were introduced [115][116][117][118][119][120][121][122][123][124][125][126][127][128][129][130][131]. Zannen et al, studied the energy storage properties of Na 1/2 (Bi 0.98 Gd 0.02 ) 1/2 TiO 3 and reported an W r of 0.85 J/cm 3 , at 60 kV/cm, with an η 90 %.…”

“…Further, different combinations of binary solutions like (1-x) [(Na 0.5 Bi 0.5 ) 0.95 Ba 0.05 ] 0.98 La 0.02 TiO 3 -xK 0.5 Na 0.5 NbO 3 , (1-x)Na 0.5 Bi 0.5 TiO 3 -xLaAlO 3 , (1-x)[(Na 0.5 Bi 0.5 ) 0.4 Sr 0.6 TiO 3 ]-xK 0.73 Bi 0.09 NbO 3 , and 0.85(Na 0.5 Bi 0.5 ) 0.7 Sr 0.3 TiO 3 -0.15Bi(Mg 2/3 Nb 1/3 )O 3 were investigated [120][121][122][123]. Furthermore, recently reported BNT based ternary RFE systems include (1-x)[0.76Na 1/2 Bi 1/2 TiO 3 -0.24SrTiO 3 ]-xAgNbO 3 and (1-x)[0.94Na 0.5 Bi 0.5 TiO 3 -0.06BaTiO 3 ]-xNa 0.73-Bi 0.09 NbO 3 [124,125]. It is reported that the incorporation of acceptor induced defect dipoles, such as introducing Mn 2+ , Mg 2+ in BNTbased systems, can result in higher P max and lower P r .…”