Dielectric and Ferroelectric Properties of Dy-Doped Sr₂Bi₄Ti₅O₁₈ Ceramics

Abstract

Sr₂Bi_4−x Dy _x Ti₅O₁₈ (SBDT-x, x = 0–0.20) ceramic samples were prepared, and their dielectric and ferroelectric properties were measured. The remnant polarization (2P _r ) of SBDT-x increased at first, then decreased with the increase of Dy content. When Dy content was 0.01, the 2P _r reached a maximum value of 20.1 μC · cm⁻². The variation of 2P _r for SBDT-x related to space charge density and structure distortion. The coercive field (E _c ) increased a little after doping. The E _c of SBDT-0.01 was 44.2 kV · cm^{− 1}. The ferroelectric property of Sr₂Bi₄Ti₅O₁₈ was enhanced by Dy doping with appropriate content.

Keywords:

• Ferroelectrics
• Sr₂Bi₄Ti₅O₁₈ ceramic
• Dy doping
• remnant polarization

ACKNOWLEDGEMENTS

The authors would like to acknowledge the financial support by the National Natural Science Foundation of China (Grant No. 10274066).