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金虫 (小有名气)

[求助] 颗粒堆积形成片状的结构,怀疑粒界处Na元素富集,如何表征?

粒径约30nm的颗粒堆积成薄片,现在怀疑颗粒的界面处有Na+富集,想把Na+的分布情况表征出来;尝试过用 SEM—EDX的mapping模式,但是可能是EDX的空间分辨率不够,鉴别不出 几十纳米 空间内的元素分布差异。本来预期的结果是Na+的分布图呈现类似于 空间多孔网络状结构, 请问有什么好的手段可以表征?
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