Abstract
Effects of praseodymium modification on the crystal structure and polarization properties were investigated for layered ferroelectric SrBi2Ta2O9 (SBT). Neutron powder diffraction and x-ray photoelectron analyses showed that praseodymium ions are substituted at the Sr site as Pr3+ and that Sr vacancies are created for compensating the charge difference between Sr2+ and Pr3+. Polarization measurements using dense ceramics indicated that low-field polarization properties were significantly improved by the praseodymium substitution. It is demonstrated that Pr–SBT has an advantage over SBT and Bi-modified SBT for a low-voltage operating ferroelectric-memory material.
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