首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Order-disorder transition in monoclinic sulfur: a precise structural study by high-resolution neutron powder diffraction
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Order-disorder transition in monoclinic sulfur: a precise structural study by high-resolution neutron powder diffraction

机译:单斜硫中的有序-无序过渡:高分辨率中子粉末衍射的精确结构研究

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摘要

High-resolution neutron powder diffraction has been used in order to characterize the order-disorder transition in monoclinic cyclo-octasulphur. Rapid data collection and the novel use of geometrically constrained refinements has enabled a direct and precise determination of the order parameter, based on molecular site occupancies, to be made. The transition is critical and continuous; with a transition temperature, T-c = 198.4 ( 3) K, and a critical exponent, beta = 0.28 (3), which is indicative of three-dimensional ordering. Difficulties encountered as a consequence of the low thermal conductivity of the sample are discussed.
机译:为了表征单斜环八硫中的有序-无序跃迁,已经使用了高分辨率中子粉末衍射。快速的数据收集和几何约束精简的新颖用法,使得能够基于分子位点占用率直接精确地确定阶数参数。过渡是关键和持续的;过渡温度T-c = 198.4(3)K,临界指数beta = 0.28(3),这表明三维排序。讨论了由于样品导热系数低而遇到的困难。

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