Multiferroic properties of BiFeO3-(K0.5Bi0.5)TiO3 ceramics

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

“…15,17 This is probably due to the high coercive electric field and dielectric loss of BFO relative to that of BKT. 5,13 Morozov et al have recently shown that the conductivity of BFO-BKT materials can be reduced by annealing in an inert atmosphere improving the electromechanical performance.…”

Control of conductivity and electric field induced strain in bulk Bi0.5K0.5TiO3–BiFeO3 ceramics

“…6 Owing to these limitations, application of pure bismuth ferrite in piezoelectric devices is challenging, but as a perovskite modifier it can be very prospective for compositional engineering. Recently, tailoring of BFO-related compositions for high-temperature electromechanical applications has been proposed for a wide range of solid solutions with lead-free Bi 0.5 K 0.5 TiO 3 (BFO-BKT), [7][8][9][10] and further along morphotropic phase boundary towards lead titanate (BFO-BKT-PT). 11,12 The understanding of the origins of the undesired conductivity in BFO has been a topic of several theoretical 13,14 and experimental [15][16][17] studies.…”

Tailoring the structure and piezoelectric properties of BiFeO3-(K0.5Bi0.5)TiO3–PbTiO3 ceramics for high temperature applications

“…The BiFeO 3 rich compositions, where x < 0.7 belong to the rhombohedral R3c phase as determined using laboratory X-rays and neutron diffraction. 26 Morozov and Matsuo determined the presence of a MPB at x ¼ 0.6 between the polar rhombohedral R3c phase and a psuedocubic phase which exists over a large compositional space between 0.25 < x < 0.6. The large electric-field induced strains reported in BF-KBT are proposed to be due to the presence of polar nano-regions (PNRs) that are easily switched by an applied electric field; 23,24 however, the PNRs return to a random order upon removal of the field and, hence, the electromechanical properties are dominated by electrostriction.…”