Diffraction Artefacts from Twins and Stacking Faults, and the Mirage of Hexagonal, Polytypes or Other Supersuperstructures

C. Cayron
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Abstract

Recently, a hexagonal phase has been reported in high carbon steels in several studies. Here, we show that the electron microscopy results used in these studies were erroneously interpreted. The extra-spots in the diffraction patterns and the odd contrasts in the high resolution images are not those a superstructure but result from double diffraction and streaking effects due to the presence of twins and stacking faults. We point out a similar unfortunate misunderstanding of these effects in papers reporting the existence of a 9R structure in aluminium or copper, or exotic forms of carbon in diamonds.
孪晶和层错的衍射伪影,以及六边形、多型或其他超超结构的幻影
近年来,在一些研究中发现高碳钢中存在六方相。在这里,我们表明,在这些研究中使用的电子显微镜结果是错误的解释。衍射图中的额外斑点和高分辨率图像中的奇怪对比不是上层建筑,而是由于孪晶和层错的存在造成的双重衍射和条纹效应。我们指出,在报告铝或铜中存在9R结构或钻石中存在奇异形式的碳的论文中,也存在类似的对这些效应的不幸误解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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