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Structural investigations on ferroelectric Pb1−3/2xLaxTiO3 using the x-ray Rietveld method

Published online by Cambridge University Press:  01 December 2004

Jun Chen ,
Xianran Xing ,
Ranbo Yu ,
Guirong Liu ,
Li Wu  and
Xiaolong Chen
Jun Chen
Affiliation:
Department of Physical Chemistry, University of Science & Technology Beijing, Beijing 100083, People’s Republic of China
Xianran Xing*
Affiliation:
Department of Physical Chemistry, University of Science & Technology Beijing, Beijing 100083, People’s Republic of China
Ranbo Yu
Affiliation:
Department of Physical Chemistry, University of Science & Technology Beijing, Beijing 100083, People’s Republic of China
Guirong Liu
Affiliation:
Department of Physical Chemistry, University of Science & Technology Beijing, Beijing 100083, People’s Republic of China
Li Wu
Affiliation:
Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
Xiaolong Chen
Affiliation:
Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: xing@ustb.edu.cn
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Abstract

The structures of the defect perovskite Pb1−3/2xLaxTiO3 prepared by the solid-state method were investigated in the solubility range of 0.05 ⩽ x ⩽ 0.30 with 0.05 increment by x-ray Rietveld method. In the system Pb1−3/2xLaxTiO3, the atom displacements of Ti (δTi) and Pb/La (δPb/La) along the spontaneous polarization (Ps) direction (c axis) decrease nonlinearly with increasing La content, while the value of δTi/δPb/La decreases linearly. The shape of oxygen octahedron of compounds Pb1−3/2xLaxTiO3 is independent of the La content. The calculated value of Ps decreases linearly in the solubility range of 0.05 ⩽ x ⩽ 0.30. In the refinement process, the hkl dependence of diffraction line broadening was also taken into account. The anisotropy of microstrain-like broadening observed in Pb1−3/2xLaxTiO3 might be ascribed to occurrence of compositional inhomogeneity between the crystallites.

Keywords

Crystallographic structureFerroelectricX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 12 , December 2004 , pp. 3614 - 3619
Copyright
Copyright © Materials Research Society 2004

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