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Springer, Journal of Materials Research, 12(19), p. 3614-3619, 2004

DOI: 10.1557/jmr.2004.0463

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Structural investigations on ferroelectric Pb<sub>1−3/2</sub><sub>x</sub>La<sub>x</sub>TiO<sub>3</sub> using the x-ray Rietveld method

Journal article published in 2004 by Jun Chen, Xianran Xing, Ranbo Yu ORCID, Guirong Liu, Li Wu, Xiaolong Chen
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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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.