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A neutron powder diffraction study of short range order in ferroelectric Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/

机译:铁电Pb(Mg / sub 1/3 / Nb / sub 2/3 /)O / sub 3 /中短程有序中子粉末衍射研究

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摘要

The structure of Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/ (PMN) was investigated using pulsed neutron powder diffraction. Rietveld analysis suggests small displacements of Pb and O atoms, with anomalously large thermal factors. The pair-distribution function (PDF) derived from experiment indicates the presence of short range order. Modeling in real space by fitting to the experimental PDF suggests displacements of lead and oxygen atoms of much larger magnitude than those indicated by the Rietveld analysis. Correlation of these displacements may be related to the onset of bulk ferroelectricity in this material.
机译:利用脉冲中子粉末衍射研究了Pb(Mg / sub 1/3 / Nb / sub 2/3 /)O / sub 3 /(PMN)的结构。 Rietveld分析表明,Pb和O原子的位移很小,而热因子却异常大。实验得出的成对分布函数(PDF)表示存在短程有序。通过拟合实验PDF在真实空间中进行建模表明,铅和氧原子的位移比Rietveld分析所表明的位移大得多。这些位移的相关性可能与这种材料中大量铁电的开始有关。

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