原位电子能量损失谱研究电子束辐照下 Al(OH)₃ 的脱水过程。

In situ EELS study of dehydration of Al(OH)₃ by electron beam irradiation.

机构信息

Department of Physics, Arizona State University, Tempe, AZ 85287-1504, USA.

出版信息

Ultramicroscopy. 2011 Jun;111(7):860-4. doi: 10.1016/j.ultramic.2010.11.004. Epub 2010 Nov 19.

DOI:10.1016/j.ultramic.2010.11.004

Abstract

The dehydration of Al(OH)₃ by an electron beam has been investigated using the time-dependent electron energy-loss spectroscopy (EELS) technique. Based on an analysis of low-loss EELS, Al L₂₃ and O K-edge, it is found that the processes are initially induced by the loss of H, followed by sputtering of O, which induce local structural changes. Some of the octahedrally coordinated Al transfer to tetrahedrally coordinated Al. The time-dependent O K-edge shows that the pre-edge peak in the O K-edge of Al(OH)₃ is induced by the formation of unpaired O, rather than an intrinsic feature of the OH bond.

摘要

采用时间分辨电子能量损失谱（EELS）技术研究了电子束作用下 Al(OH)₃的脱水过程。基于对低损耗 EELS、Al L₂₃ 和 O K 边的分析，发现该过程最初是由 H 的损失引起的，随后是 O 的溅射，导致局部结构发生变化。一些八面体配位的 Al 转移到四面体配位的 Al。时间分辨的 O K 边表明，Al(OH)₃ 的 O K 边的预边峰是由不成对 O 的形成引起的，而不是 OH 键的固有特征。