Lanthanide doping effects on properties of Sr2Bi4Ti5O18ceramics

Ceramic samples of samarium, dysprosium and lanthanum doped Sr2Bi4Ti5O18(SBTi) were prepared by solid-state reaction. The remnant polarization (2Pr) increases at first, then decreases with the increase of doping content. The 2Prfor Sm and Dy doped SBTi reached a maximum value of 18.2 μC·cm-2and 20.1 (μC-cm-2, respectively, when doping content was 0.01. La doped SBTi has maximum 2Prvalue of 18.4 μC·cm-2with doping content of 0.05. The variation of ferroelectric properties of Sr2Bi4-xLnxTi5O18(Ln = Sm, Dy and La) should be determined by the competition of the decrease of oxygen vacancy concentration and the relief of structural distortion.