Relationship between property, average and local crystal structures, and ferroelectric performances of (Bi,Pr)₄(Ti,Si)₃O₁₂ ferroelectric material

Abstract

Bi₄Ti₃O₁₂-based ferroelectric materials are expected to be applied for FeRAM because of their high remanent and excellent polarization fatigue characteristic. In this study, we synthesized Bi_4-xPr_xTi₃O₁₂(BPT) with and without Bi₄Si₃O₁₂(BSO)-addition, and then heat-treated the products under high P_O2. As for the samples, we investigated their properties, average and local structures and ferroelectric performances, and discussed influences of the BSO-addition and the heat-treatments. P-E hysteresis measurements confirmed that Pr increased and Ec decreased by adding BSO. From the local structure analysis, such improvements of ferroelectric performances are considered due to local distortion around Ti and Si.