电镜能谱仪中过渡金属元素的化学价态分析

                                      镜能谱仪中过渡金属元素的化学价态分析

                                                  姚青倩^1，2，许瑞梅¹，赵文霞^1*

（1.中山大学测试中心，广东 广州 510275；2.南开大学环境科学与工程学院，天津 300350）

摘 要  本文利用电子探针-能谱仪(EPMA-EDS)对试样微米区域内过渡金属元素的化学价态进行了分析。研究结果表明，过渡金属元素的化学价态可以通过特征X射线L_a/K_b强度比值结果进行区分，但试样形状，组成成分和化学结构等都可能影响化学价态的判断。此外，本文结合电子-离子碰撞的相关理论对实验结果进行了合理的解释，并将此方法应用到未知样品元素价态的判断中。研究结果对样品过渡金属元素化学价态的判断具有重要参考价值。

关键词  能谱仪；过渡金属元素；化学价态；特征X射线强度比值

中图分类号：TH842；O614         文献标识码：A    doi:10.3969/j.issn.1000-6281.2016.03.004

Valence state analysis of transitionmetalsby energy dispersive X-ray spectrometry in electron microscope

YAO Qing-qian^1，2，XU Rui-mei¹，ZHAO Wen-xia^1*

（1. Instrumental Analysis and Research Center，Sun-Yat-Sen University，Guangzhou Guangdong 510275；2.College of Environmental Science and Engineering，Nankai University，Tianjin 300350，China）

Abstract  In this article，EPMA-EDS was used to analyze valence states of several transition metal elements in micro-area of a sample. Based on the results，valence states can be determined by collecting intensity ratios of characteristic X-rays of L_ato K_b. However, this method also proved that the appearance, components, chemical structures and other factors of samples will have effects oninfluence the judgment of valence states.Furthermore, the theoretical model of electron-ioncollision was illustrated used to explain this new method. In addition, agood result wasobtainedwhenapplied in an unknownsample. The research results would be an important reference to the valence states analysis of transition metal elements in a sample.

Keywords EDS；transition metalelements；valence states；the intensity ratios of characteristic X-rays

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