Dielectric, Ferroelectric, and Piezoelectric Properties of BiFeO3-BaTiO3 Ceramics

Perovskite solid solution ceramics of (1-x)BiFeO3-xBaTiO(3) (1-x)BF-xBT, 0.2x0.45) with high electrical resistivity were prepared by solid-state reaction method. Actual ferroelectric hysteresis loops and temperature dependence of dielectric constant of the ceramics were obtained. Ceramics of 0.7BF-0.3BT with small rhombohedral distortion show highest remnant polarization (P-r=26.0C/cm(2)) and piezoelectric coefficient (d(33)=134pC/N). Compositions with pseudo-cubic symmetry (intermediate phases) show relaxor-like dielectric anomaly. The values of P-r and d(33) decrease with increasing BT content, from 24.8C/cm(2) and 104pC/N for 0.65BF-0.35BT to 8.2C/cm(2) and 5pC/N for 0.55BF-0.45BT.