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arXiv 1503.00942cond-mat.mtrl-scicond-mat.other
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二十面体准晶中单胞孪晶与镶嵌的等价性

The Equivalence Between Unit-Cell Twinning and Tiling in Icosahedral Quasicrystals

Albert Prodan, Ram Dušić Hren, Marion van Midden, Herman J. P. van Midden, Erik Zupanič

摘要:

结果表明,平铺在二十面体准晶也可以适当地描述在单位晶胞水平的循环孪生。孪生操作被应用于原始的长形黄金菱面体,这可以被认为是一个扭曲的面心立方母体结构的结果。菱形体的形状由精确的空间填充决定,类似于被禁止的五重旋转对称。围绕多重孪生菱形六边形多面体形成的簇的堆叠使相邻簇的菱形保持离散关系。因此,周期,相互关联的斐波那契系列的成员,形成。共生孪晶没有形成明显的孪晶边界,并与接触的团簇之间形成的扁金色菱面体结合填充空间。多重孪晶菱面体的模拟衍射图和扩展模型结构的傅里叶变换与实验衍射图完全一致,并可通过三维晶体学方法进行指标化。

英文摘要:

It is shown that tiling in icosahedral quasicrystals can also be properly described by cyclic twinning at the unit cell level. The twinning operation is applied on the primitive prolate golden rhombohedra, which can be considered a result of a distorted face-centered cubic parent structure. The shape of the rhombohedra is determined by an exact space filling, resembling the forbidden five-fold rotational symmetry. Stacking of clusters, formed around multiply twinned rhombic hexecontahedra, keeps the rhombohedra of adjacent clusters in discrete relationships. Thus periodicities, interrelated as members of a Fibonacci series, are formed. The intergrown twins form no obvious twin boundaries and fill the space in combination with the oblate golden rhombohedra, formed between clusters in contact. Simulated diffraction patterns of the multiply twinned rhombohedra and the Fourier transform of an extended model structure are in full accord with the experimental diffraction patterns and can be indexed by means of three-dimensional crystallography.

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