Gertsman Valéry Y, Kwok Queenie S M
Natural Resources Canada, CANMET, MTL, 568 Booth Street, Ottawa, ON K1A 0G1, Canada.
Microsc Microanal. 2005 Oct;11(5):410-20. doi: 10.1017/S1431927605050336.
Nanophase aluminum powder was characterized in a field-emission-gun transmission electron microscope (TEM). Different techniques were used to investigate the structure of the particles, including conventional bright-field and dark-field imaging, scanning transmission electron microscopy (STEM), high-resolution lattice imaging, diffraction studies, energy dispersive X-ray spectroscopy (EDS) analysis and mapping, and electron energy loss spectroscopy (EELS) analysis and mapping. It has been established that the particle cores consist of aluminum single crystals that sometimes contain crystal lattice defects. The core is covered by a passivating layer of aluminum oxide a few nanometers thick. The alumina is mostly amorphous, but evidences of partial crystallinity of the oxide were also found. The thickness of this layer was measured using different techniques, and the results are in good agreement with each other. The particles are agglomerated in two distinct ways. Some particles were apparently bonded together during processing before oxidation. These mostly form dumbbells covered by a joint oxide layer. Also, oxidized particles are loosely assembled into relatively large clusters.
纳米相铝粉在场发射枪透射电子显微镜（TEM）中进行了表征。采用了不同技术来研究颗粒的结构，包括传统的明场和暗场成像、扫描透射电子显微镜（STEM）、高分辨率晶格成像、衍射研究、能量色散X射线光谱（EDS）分析和映射以及电子能量损失光谱（EELS）分析和映射。已经确定颗粒核心由有时包含晶格缺陷的铝单晶组成。核心被几纳米厚的氧化铝钝化层覆盖。氧化铝大多是非晶态的，但也发现了氧化物部分结晶的证据。使用不同技术测量了该层的厚度，结果彼此吻合良好。颗粒以两种不同方式团聚。一些颗粒在氧化前的加工过程中显然结合在一起。这些大多形成被联合氧化层覆盖的哑铃状。此外，氧化颗粒松散地组装成相对较大的簇。
