Determination of twinning relationships between diopside dendrites

Determination of twinning relationships between diopside dendrites
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透辉石枝晶之间孪生关系的测定

DOI:
10.1107/s0021889810033832
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发表时间:
2010-12
影响因子:
6.1
通讯作者:
Liu, Hong-Wei
Liu, Hong-Wei
中科院分区:
材料科学3区
文献类型:
--
作者:
Xu, Hai-Jun;Liu, Hui-Fang;Mason, Roger;Zhao, Shan-Rong;Liu, Hong-Wei

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电子背散射衍射用于确定人工合成透辉石树枝状晶体的取向,揭示了三种树枝状晶体之间的新的孪生关系。这三个晶体被认为是成对的,它们由两个孪生定律联系在一起:对于两对,孪晶平面{OVERLINE 251}和孪生轴〈\OVERLINE 142〉;对于第三对,孪晶平面{OVLINE 221}和双晶轴〈\OVERLINE 356〉垂直于孪晶平面。后一对晶体之间的双轴和孪晶面与第三个晶体内部的双轴和对称面紧密匹配。三种枝晶在孪晶结构中的分布总体呈2/m对称性,透辉石的点群控制着三种晶体的整体组合。用Mallard和Friedel理论分析了孪晶规律,计算了孪晶指数和孪晶倾角。复杂的孪晶定律产生了良好的晶格符合,而基于{201}面的晶格关系分析证实了孪晶定律。
Electron backscattered diffraction, used to determine the orientations of dendritic crystals of synthetic diopside, revealed novel twinning relationships between three dendrite crystals. The three crystals, considered pairwise, are related by two twinning laws: for two pairs, twin plane {\overline 251} and twin axis 〈\overline 142〉 perpendicular to the twin plane; and for the third pair, twin plane {\overline 221} and twin axis 〈\overline 356〉 perpendicular to the twin plane. The twin axes and twin planes between the latter pair of crystals closely match the twofold axis and symmetry plane inside the third crystal. The distribution of the three dendrite crystals in the twin structure shows overall 2/m symmetry, so the point group of diopside controls the whole combination of three crystals. The twin laws have been analysed using the theories of Mallard and Friedel, and twin indices and twin obliquity calculated. The complex twin laws yield a good lattice coincidence, and lattice relationship analysis based on the {201} plane confirms the twin laws.
DOI: --
发表时间: 1981-04
影响因子: 3.1
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Loursn LEvreN'eNo;CHeRtEs T. PREwrrr
通讯作者: Loursn LEvreN'eNo;CHeRtEs T. PREwrrr
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影响因子: 1.4
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