Structural investigations on ferroelectric Pb_(1-3/2x)La_xTiO_3 using the x-ray Rietveld method

Jun Chen; Xianran Xing; Ranbo Yu

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Structural investigations on ferroelectric Pb_(1-3/2x)La_xTiO_3 using the x-ray Rietveld method

机译：用X射线Rietveld方法研究铁电Pb_（1-3 / 2x）La_xTiO_3的结构

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The structures of the defect perovskite Pb_(1-3/2x)La_xTiO_3 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 Pb_(1-3/2x)La_xTiO_3, the atom displacements of Ti (delta_(Ti)) and Pb/La (delta_(Pb/La)) along the spontaneous polarization (P_s) direction (c axis) decrease nonlinearly with increasing La content, while the value of delta_(Ti)/ delta_(Pb/La) decreases linearly. The shape of oxygen octahedron of compounds Pb_(1-3/2x)La_xTiO_3 is independent of the La content. The calculated value of P_s 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 Pb_(1-3/2x)La_xTiO_3 might be ascribed to occurrence of compositional inhomogeneity between the crystallites.

机译：用X射线Rietveld方法研究了固溶法制备的钙钛矿缺陷Pb_（1-3 / 2x）La_xTiO_3的结构，在0.05 <= x <= 0.30的溶解度范围内，以0.05为增量。在系统Pb_（1-3 / 2x）La_xTiO_3中，Ti（delta_（Ti））和Pb / La（delta_（Pb / La））沿自发极化（P_s）方向（c轴）的原子位移非线性减小随着La含量的增加，而delta_（Ti）/ delta_（Pb / La）的值线性减小。化合物Pb_（1-3 / 2x）La_xTiO_3的氧八面体的形状与La含量无关。 P_s的计算值在0.05 <= x <= 0.30的溶解度范围内线性下降。在细化过程中，也考虑了衍射线加宽的hkl依赖性。在Pb_（1-3 / 2x）La_xTiO_3中观察到的微应变样展宽的各向异性可能归因于微晶之间组成不均匀性的发生。

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来源
《Journal of Materials Research》 |2004年第12期|p.3614-3619|共6页
作者
Jun Chen; Xianran Xing; Ranbo Yu;
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作者单位

Department of Physical Chemistry, University of Science & Technology Beijing, Beijing 100083, People's Republic of China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类工程材料学;
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Structural investigations on ferroelectric Pb_(1-3/2x)La_xTiO_3 using the x-ray Rietveld method

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