Lanthanide Doping Effects on Properties of Sr2Bi4 Ti5O18 Ceramics
来源期刊：JOURNAL OF RARE EARTHS2004年增刊第3期
论文作者：Chen Xiaobing Qiang FENG Zhu Jun
Key words：Sr2Bi4Tis O18 ceramic; lanthanide substitution; Curie temperature; remnant polarization;
Abstract: Ceramic samples of samarium, dysprosium and lanthanum doped Sr2 Bi4Ti5 O18 (SBTi) were prepared by solid-state reaction. The remnant polarization (2Pr) increases at first, then decreases with the increase of doping content.The 2Pr for Sm and Dy doped SBTi reached a maximum value of 18.2μC·cm-2 and 20.1μC·m-2, respectively,when doping content was 0.01. La doped SBTi has maximum 2Pr value of 18.4μC·m-2 with 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.
Chen Xiaobing1，Qiang FENG1，Zhu Jun1
(1.College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China)
Abstract:Ceramic samples of samarium, dysprosium and lanthanum doped Sr2 Bi4Ti5 O18 (SBTi) were prepared by solid-state reaction. The remnant polarization (2Pr) increases at first, then decreases with the increase of doping content.The 2Pr for Sm and Dy doped SBTi reached a maximum value of 18.2μC·cm-2 and 20.1μC·m-2, respectively,when doping content was 0.01. La doped SBTi has maximum 2Pr value of 18.4μC·m-2 with 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.
Key words:Sr2Bi4Tis O18 ceramic; lanthanide substitution; Curie temperature; remnant polarization;
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