Influence of K 0.5 Bi 0.5 TiO 3 on the structure, dielectric and ferroelectric properties of (Ba,Ca)(Zr,Ti)O 3 ceramics

Effects of quenching on phase transformations and ferroelectric properties of 0.35BCZT-0.65KBT ceramics

“…In this study, as mentioned in our previous work [20], the constricted P-E loops were attributed to the presence of reversible polarisation switching in PNRs in addition to the chemical heterogeneity that was observed in the form of core-shell grain structures, comprising tetragonal ferroelectric BCZT-rich cores with pseudo-cubic relaxor ferroelectric KBT-rich shell regions. Therefore, two factors could influence ferroelectric behaviour in this study, which are the ferroelectric phase fraction On the other hand, after quenching the ceramic with x=0.06 has a more-rectangular P-E loop and higher coercive field.…”

“…The dominant feature in the slow-cooled samples is the core-shell type microstructure, as shown in Figure 3(a) and (c). The identification of core and shell regions in these ceramics was discussed in our previous investigation [20] in terms of tetragonal ferroelectric BCZT-rich cores with pseudo-cubic relaxor ferroelectric KBT-rich shell regions. On the other hand, clearly defined ferroelectric domain structures were observed throughout the grains in the quenched-poled sample with x=0.06, as shown in Figure 3(b).…”

“…Bismuth-based perovskite relaxors such as BNT (Bi0.5Na0.5TiO3) and related materials are prime examples of such behaviour [13,14]. This characteristic was also observed in K0.5Bi0.5TiO3-doped (Ba,Ca)(Zr,Ti)O3, BCZT-KBT [20]. Large electromechanical strains of up to 0.43% (Smax/Emax= 621 pm/V) have been generated in xBi(Mg0.5Ti0.5)O3-(0.75−x)PbTiO3-0.25(Bi0.5Na0.5)TiO3 ternary solid solutions at the MPB region with 0.50 < x < 0.51, where the coexistence of tetragonal and pseudocubic phases was reported, leading to an ergodic relaxor ferroelectric state [21].…”

Relaxor behavior and photocatalytic properties of BaBi2Nb2O9

“…Compared to normal ferroelectrics, they exhibit a broad, frequency-dependent anomaly at the temperature (T m ) of the dielectric peak and a small remnant polarization. 11,12 RFEs have been proposed for various applications, such as energy storage capacitors, piezoelectric actuators, ultrasonic transducers, etc. 13,14 However, there are very few studies of their photocatalytic properties.…”

“…Relaxor ferroelectrics (RFEs) are a special category of ferroelectric materials. Compared to normal ferroelectrics, they exhibit a broad, frequency‐dependent anomaly at the temperature ( T m ) of the dielectric peak and a small remnant polarization . RFEs have been proposed for various applications, such as energy storage capacitors, piezoelectric actuators, ultrasonic transducers, etc .…”