Ferroelectric Properties and Domain Structures of (Bi<sub>0.5</sub>K<sub>0.5</sub>)TiO<sub>3</sub>-BiFeO<sub>3</sub> Ceramics
Hiroki MatsuoYuuki KitanakaYuji NoguchiMasaru MiyayamaTomoatsu OzakiShigeo MoriShuki ToriiTakashi Kamiyama
Abstract
Crystal structures and dielectric, polarization, and piezoelectric properties of x(Bi0.5K0.5)TiO3-(1−x)BiFeO3 ceramics were investigated. The results obtained using x-ray and neutron powder diffractions show that a morphotropic phase boundary between the rhombohedral (ferroelectric) and pseudo-cubic (ferroelectric) phases is present in 0.4 ＜ x ＜ 0.43. Ceramics with x = 0.4 exhibited a large remanent polarization of 52 μC/cm2 at 25 ℃ (1Hz). In addition, ceramics with x = 0.4 showed a relatively large electric-field-induced strain (Smax/Emax = 250 pm/V) at a high temperature of 200 ℃. Transmission electron microscopy for x = 0.4 provides evidence of polar nanosized domains with R3c rhombohedral structure. It is suggested that the presence of the nanosized domains is the origin of relaxor-like dielectric behavior.
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