弛豫铌镁酸铅离子对位移关联的X射线漫散射研究
X-Ray Diffuse Scattering Study on Ionic-Pair Displacement Correlations in Relaxor Lead Magnesium Niobate
摘要：
本文用X射线漫散射技术研究了室温下弛豫镁酸铅（$Pb(Mg_{1/3}Nb_{2/3})O_{3}$）中离子对等时位移关联。定量地确定了不同相关性的函数。结果表明，Pb-O、Mg/Nb-O和O-O'对的菱面体极性相关性非常强。它们的空间分布形成半径为30-80 $Å$的椭圆或球体。对系统中局部结构的观察证明了顺电态中极性微区的偶然存在，这导致了介电色散。
英文摘要：
Ionic-pair equal-time displacement correlations in relaxor lead magnesium niobate, $Pb(Mg_{1/3}Nb_{2/3})O_{3}$, have been investigated at room temperature in terms of an x-ray diffuse scattering technique. Functions of the distinct correlations have been determined quantitatively. The results show the significantly strong rhombohedral-polar correlations regarding Pb-O, Mg/Nb-O, and O-O' pairs. Their spatial distribution forms an ellipse or a sphere with the radii of 30-80$Å$. This observation of local structure in the system proves precursory presence of the polar microregions in the paraelectric state which leads to the dielectric dispersion.
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