Enrichment of Chromium at Grain Boundaries in Chromia Doped UO2

Enrichment of Chromium at Grain Boundaries in Chromia Doped UO2
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掺铬 UO2 中铬在晶界处的富集

DOI:
10.1016/j.jnucmat.2023.154250
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发表时间:
2023
影响因子:
3.1
通讯作者:
Middleburgh S
Middleburgh S
中科院分区:
工程技术2区
文献类型:
--
作者:
Middleburgh S

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用高分辨电子显微镜对掺铬(Cr2O3)燃料的晶界进行了评估,并与相同工艺生产的未掺杂燃料进行了比较。用能量色散X射线能谱(EDS)对晶界进行了化学分析。结果表明,在掺杂的燃料中,沿晶界形成了一个相对无序的相,它们被化学富铬。这对燃料制造和反应堆内行为的预测和理解具有重要意义,因为许多过程高度依赖于晶界机制。
Assessment of grain boundaries in chromia (Cr2O3) doped fuels has been carried out using high resolution transmission electron microscopy to assess the structure compared to undoped fuel produced via the same process. Chemical analysis of the grain boundary was carried out using Energy Dispersive X-ray Spectroscopy (EDS). It was shown that a relatively disordered phase is formed along the grain boundaries in the doped fuel and that they were chemically enriched in chromium. This has implications for the prediction and understanding of fuel manufacture and in-reactor behaviour as many processes are highly dependant on grain boundary mechanisms.
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