Laser-induced annealing of aged PuO2,Journal of Raman Spectroscopy

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Laser-induced annealing of aged PuO2
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2021-06-16 , DOI: 10.1002/jrs.6185
Eliel Villa‐Aleman ₁ , Don D. Dick ₁ , Jonathan H. Christian ₁ , Bryan J. Foley ₁

Affiliation

Plutonium dioxide (PuO₂) is an important compound used in nuclear fuel, irradiation targets, and heat sources. As such, improved understanding of its structural and spectroscopic properties has numerous applications. Alpha particle-induced damage of a PuO₂ crystal lattice modifies several properties of its Raman spectrum, including band intensities, positions, and widths. The decay also induces growth of new bands and creates electron-trapped defects with luminescent properties. Herein, we show for the first time that laser-induced heating can reverse damage to an aged and damaged PuO₂ lattice. Using automated instrumentation to heat a single 6–10 μm spot to temperatures above 1,300°C, we show that laser-induced annealing of aged PuO₂ results in restoration of T_2g band intensity with a concomitant decrease in defect band intensity, a result that indicates laser annealing can be used to reverse age-damage in PuO₂. This laser annealing approach permitted in situ observation of temperature-dependent Raman spectral changes, thereby providing insight into the thermodynamics of structural alterations in a radiolytically damaged PuO₂.

中文翻译：

老化 PuO2 的激光诱导退火

二氧化钚 (PuO ₂ ) 是一种重要的化合物，用于核燃料、辐照目标和热源。因此，对其结构和光谱特性的更好理解具有许多应用。α 粒子诱导的 PuO ₂晶格损伤会改变其拉曼光谱的几个特性，包括能带强度、位置和宽度。衰变还会诱导新能带的生长并产生具有发光特性的电子俘获缺陷。在此，我们首次表明激光诱导加热可以逆转老化和损坏的 PuO ₂晶格的损坏。使用自动化仪器将单个 6–10 μm 光斑加热到 1,300°C 以上的温度，我们证明了老化 PuO _{2 的}激光诱导退火导致 T _2g带强度恢复，同时缺陷带强度降低，结果表明激光退火可用于逆转 PuO _{2 中的}老化损伤。这种激光退火方法允许原位观察与温度相关的拉曼光谱变化，从而深入了解受辐射破坏的 PuO ₂中结构变化的热力学。

更新日期：2021-08-13

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