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EPMA Analysis of the Unstable Sample

Li Xiangting(Shanghai Institute of Ceramics, Chinese Academy of Sciences )  
The composition change of unstable samples such as Na,K, Cu,and Ag in glasses,mineral and fast ionconductors during EPMA analysis process was studied. The ion migration and vaporization in samples are re-sponsible for the composition variation during electron bombardment. The balance between gathering and vapor-izing of the mobile component will determine the direction of variation in the X-ray counts, if gathering isgreater than vaporizing, the X-ray count of the mobile component will increase with time, otherwise it will de-crease.The results obtained are useful in understandng the behaviour of migration and for EPMA analysis proce-dure of unstable samples.
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