Abstract
Insulated Bi1−xDyxFeO3 (x=0–0.2) were prepared to study their multiferroic properties at various temperatures. Bi1−xDyxFeO3 (x=0–0.08) shows rhombohedral phase, ferroelectric polarization of >18μC/cm2, and piezoelectric d33 value of >35pC/N at room temperature. After the polarized ceramics were annealed at various high temperatures, the piezoelectric d33 changes suggest that ferroelectric component exists below 700°C. There are ferroelectric phase and PZT-like anti-polar orthorhombic phase together in Bi1−xDyxFeO3 (x=0.11–0.17), although only ferroelectric phase contributes polarization and d33 which decreases with Dy concentration at this two-phase coexistence region. Finally, Bi1−xDyxFeO3 (x=0.2) transforms to non-polar orthorhombic phase according to structural and electric measurements.
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