On the identification of twinning in body-centred cubic nanoparticles.

On the identification of twinning in body-centred cubic nanoparticles.
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DOI:
10.1039/d0nr06957d
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发表时间:
2020-11-12
期刊:
影响因子:
6.7
通讯作者:
Ringe E
Ringe E
中科院分区:
材料科学2区
文献类型:
--
作者:
Hopper ER;Boukouvala C;Johnstone DN;Biggins JS;Ringe E

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本通讯描述了基于形状以及电子显微镜和衍射特征来识别BCC孪生的诊断方法。包括Fe和W在内的许多金属和合金采用体心立方(BCC)晶体结构,这些金属的纳米颗粒正在获得重要的科学和工业相关性。孪晶对催化活性有显著的影响,但几乎没有证据支持或反对BCC纳米粒子中存在孪晶。在这里,我们探索了孪晶BCC纳米粒子的潜在形状,并预测了它们的电子显微镜和衍射特征。体心立方单晶和孪晶的形状通常看起来相似,并且沿着沿着共同的低折射率区轴的衍射图案通常是不可区分的,这对许多单晶的说法产生了怀疑。最后,我们概述了如何纳米粒子的特点,最终证明存在或不存在的孪生。
This Communication describes diagnostic approaches to identify BCC twinning based on shape as well as electron microscopy and diffraction signatures. Many metals and alloys, including Fe and W, adopt body-centred cubic (BCC) crystal structures and nanoparticles of these metals are gaining significant scientific and industrial relevance. Twinning has a marked effect on catalytic activity, yet there is little evidence for or against the presence of twinning in BCC nanoparticles. Here, we explore the potential shapes of twinned BCC nanoparticles, and predict their electron microscopy and diffraction signatures. BCC single crystal and twinned shapes often appear similar and diffraction patterns along common, low-index zone axes are often indistinguishable, casting doubt on many claims of single crystallinity. We conclude by outlining how nanoparticles can be characterized to conclusively prove the presence or absence of twinning.
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