Lead-Free Relaxor-Like 0.75Bi_0.5K_0.5TiO₃– 0.25BiFeO₃Ceramics with Large Electric Field-Induced Strain

Polarization and strain response in Bi0.5K0.5TiO3-BiFeO3 ceramics

“…This is in qualitative agreement with our preliminary characterization, though the averaged strain derived in this work is slightly higher than in our previous report. 24 The frequency dispersion of the strain also shows a stable response above 100 °C, while logarithmic frequency dependence takes place at room temperature (Fig. 4(b)).…”

“…The temperaturedependent dielectric dispersion in the BKT-BFO system is relaxor-like, 21,22 including the case of BKTF-25. 24 Thus, the second possible contribution may be related to some extent of ergodicity, when the field-induced long-range polar order in relaxor is partially unstable.…”

Temperature stable and fatigue resistant lead-free ceramics for actuators

“…All peaks are attributed to a single perovskite structured phase, similar to the pseudocubic structure reported in KBT-BF systems. [17][18][19][20] Figure 1(b) is a secondary electron SEM image of KBNFT9 showing a dense microstructure of cuboid grains with an average size of <1 lm.…”

“…KBT has the perovskite structure with tetragonal symmetry at room temperature (RT) and a T c of 380 C. 15,16 The piezoelectric properties of KBT are moderate (d 33 ¼ 69 pC/N and strain 0.1% at 8 kV/mm) for hot pressed ceramics. 15 Doping with BiFeO 3 (BF) improves the piezoelectric properties of KBT, [17][18][19][20] and Morozov et. al.…”

Electrical conductivity and thermopower of (1 − x) BiFeO3– xBi0.5K0.5TiO3(x = 0.1, 0.2) ceramics near the ferroelectric to paraelectric phase transition

“…12,13,[15][16][17][18][19][20] Solid solutions of BFO with BKT suppresses the formation of the parasitic phases well known in pure BFO and phase pure BFO-BKT materials are obtain by conventional solid state synthesis. 8,15 BFO-BKT materials are isostructural with BFO at a high BFO content.…”