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Evaluation of the dissolution behavior of zircon using high-resolution phase-shift interferometry microscope
Journal of Nuclear Materials ( IF 3.1 ) Pub Date : 2021-08-19 , DOI: 10.1016/j.jnucmat.2021.153254
Toru KITAGAKI 1
Affiliation  

The dissolution behavior of the (101) plane of zircon mineral in ultrapure water, 1 M HCl (aq), and 1 M NaOH (aq), under room temperature and nearly atmospheric pressure was evaluated by in situ measurement of the change in the surface height. A high-resolution phase-shift interferometry microscope (HR-PSI) was employed to evaluate the velocity of the change in the surface height of zircon in different solutions, and the application of this method in evaluating the dissolution behavior of nuclear materials was examined. In all cases, the measured surface height decreased linearly with small variations. Although the measured change in height of zircon in 1 M NaOH (aq) was the smallest under these conditions, the concentration of dissolved Zr in NaOH (aq) was two orders of magnitude higher than that in ultrapure water. This indicates that a high amount of dissolved Zr in 1 M NaOH (aq) was immediately precipitated on the zircon surface as a secondary phase, and the surface shape was almost retained. On the other hand, the precipitation on the reference of the surface height was confirmed while measuring the zircon in 1 M HCl (aq). This shows that the precipitation in 1 M HCl (aq) occurred far from the dissolution points, and the surface shape changed. As a result, the velocity of surface change and the precipitation behavior of zircon, which is one of the extremely durable minerals, was successfully evaluated using HR-PSI. This relatively quick method would be useful for evaluating the detailed surface change behaviors of nuclear materials, such as fuel debris, ceramic waste forms, and UO2, during the reaction with various solutions, since it minimises radiation exposure times and also the amount of radioactive waste generation during measurement.



中文翻译:

使用高分辨率相移干涉显微镜评估锆石的溶解行为

锆石矿物 (101) 面在超纯水、1 M HCl (aq) 和 1 M NaOH (aq) 中的溶解行为在室温和接近大气压下通过表面变化的原位测量来评估高度。采用高分辨率相移干涉显微镜(HR-PSI)评估不同溶液中锆石表面高度变化的速度,并研究了该方法在评估核材料溶解行为中的应用。在所有情况下,测量的表面高度线性下降,变化很小。尽管在这些条件下测得的锆石在 1 M NaOH (aq) 中的高度变化最小,但 NaOH (aq) 中溶解的 Zr 浓度比超纯水高两个数量级。这表明大量溶解在 1 M NaOH (aq) 中的 Zr 立即作为第二相沉淀在锆石表面,表面形状几乎保持不变。另一方面,在 1 M HCl (aq) 中测量锆石时,确认了表面高度参考上的沉淀。这表明 1 M HCl (aq) 中的沉淀发生在远离溶解点的地方,并且表面形状发生了变化。结果,使用 HR-PSI 成功评估了锆石(极其耐用的矿物之一)的表面变化速度和沉淀行为。这种相对快速的方法可用于评估核材料的详细表面变化行为,例如燃料碎片、陶瓷废物形式和 UO 在 1 M HCl (aq) 中测量锆石时,确认了表面高度参考上的沉淀。这表明 1 M HCl (aq) 中的沉淀发生在远离溶解点的地方,并且表面形状发生了变化。结果,使用 HR-PSI 成功评估了锆石(极其耐用的矿物之一)的表面变化速度和沉淀行为。这种相对快速的方法可用于评估核材料的详细表面变化行为,例如燃料碎片、陶瓷废物形式和 UO 在 1 M HCl (aq) 中测量锆石时,确认了表面高度参考上的沉淀。这表明 1 M HCl (aq) 中的沉淀发生在远离溶解点的地方,并且表面形状发生了变化。结果,使用 HR-PSI 成功评估了锆石(极其耐用的矿物之一)的表面变化速度和沉淀行为。这种相对快速的方法可用于评估核材料的详细表面变化行为,例如燃料碎片、陶瓷废物形式和 UO 使用 HR-PSI 成功评估了锆石的表面变化速度和沉淀行为,锆石是极其耐用的矿物之一。这种相对快速的方法可用于评估核材料的详细表面变化行为,例如燃料碎片、陶瓷废物形式和 UO 使用 HR-PSI 成功评估了锆石的表面变化速度和沉淀行为,锆石是极其耐用的矿物之一。这种相对快速的方法可用于评估核材料的详细表面变化行为,例如燃料碎片、陶瓷废物形式和 UO2,在与各种溶液的反应过程中,因为它最大限度地减少了辐射暴露时间和测量过程中产生的放射性废物量。

更新日期:2021-09-01
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