运动学衍射能区分有序和无序吗?
Can Kinematic Diffraction Distinguish Order from Disorder?
摘要:
衍射方法是固体结构测定的核心。虽然类布拉格散射(纯点衍射)是晶体和准晶的一个特征,但解释连续衍射强度并不简单,通常与无序的存在有关。然而,基于简单的模型系统,我们表明,它可能是不可能得出结论的程度,在系统中的衍射图像。特别是,我们构建了一个家庭的一维二元系统,覆盖整个熵范围内,但仍然共享相同的纯漫衍射谱。
英文摘要:
Diffraction methods are at the heart of structure determination of solids. While Bragg-like scattering (pure point diffraction) is a characteristic feature of crystals and quasicrystals, it is not straightforward to interpret continuous diffraction intensities, which are generally linked to the presence of disorder. However, based on simple model systems, we demonstrate that it may be impossible to draw conclusions on the degree of order in the system from its diffraction image. In particular, we construct a family of one-dimensional binary systems which cover the entire entropy range but still share the same purely diffuse diffraction spectrum.
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