Characterization of Atomic Structures of Nanosized Intermetallic Compounds Using Electron Diffraction Methods,Advanced Materials

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Characterization of Atomic Structures of Nanosized Intermetallic Compounds Using Electron Diffraction Methods
Advanced Materials ( IF 27.4 ) Pub Date : 2018-03-30 , DOI: 10.1002/adma.201706704
Louisa Meshi ₁ , Shmuel Samuha ₂

Affiliation

In metallurgy, many intermetallic compounds crystallize as nanosized particles in metallic matrices. These particles influence dramatically the physical properties of engineering materials such as alloys and steels. Since properties and crystal structure are intimately linked, characterization of the atomic model of these intermetallides is crucial for the development of new alloys. However, this structural information usually cannot be attained using traditional X‐ray diffraction methods, limited by the small volume and size of the precipitates. In these cases, electron diffraction (ED) is the most suitable method. In the last few decades, ED has experienced a tremendous leap forward. Many structures, including intermetallides, are solved using these methods. The class of intermetallides should be discussed independently since these phases do not comprise regular polyhedrals; moreover, the interatomic distances and angles vary drastically even in the same compositional system. These facts point to difficulties that have to be overcome during the solution path. Furthermore, intermetallic compounds can be of high complexity—possessing hundreds of atoms in the unit cell. Here, this topic is expanded with an emphasis on novel developments in the field.

中文翻译：

电子衍射法表征纳米金属间化合物的原子结构

在冶金学中，许多金属间化合物在金属基质中结晶为纳米级颗粒。这些颗粒极大地影响了工程材料（例如合金和钢）的物理性能。由于性能和晶体结构密切相关，因此这些金属间化合物的原子模型表征对于开发新合金至关重要。但是，由于沉淀物的体积小且尺寸小，通常无法使用传统的X射线衍射方法获得这种结构信息。在这些情况下，电子衍射（ED）是最合适的方法。在过去的几十年中，ED经历了巨大的飞跃。使用这些方法可以解决许多结构，包括金属间化合物。金属间金属化物的类别应单独讨论，因为这些相不包含规则的多面体。此外，即使在相同的组成系统中，原子间的距离和角度也发生巨大变化。这些事实表明在解决路径中必须克服的困难。此外，金属间化合物可能具有很高的复杂性-在晶胞中拥有数百个原子。在这里，该主题的扩展着重于该领域的新颖发展。

更新日期：2018-03-30

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