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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Phase stability of U5Si4, USi, and U2Si3 in the uranium-silicon system
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Phase stability of U5Si4, USi, and U2Si3 in the uranium-silicon system

机译：U5SI4，USI和U2SI3在铀 - 硅系统中的相位稳定性

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摘要

The intermetallic compound U3Si2 has received interest in recent years for use as accident tolerant fuels in light water reactors due to its combination of high thermal conductivity, reasonably high melting point, and high uranium density compared to UO2. Although U3Si2 is well characterized there are ucertainties about the remaining phases in the U-Si system which could be potential fission products of the silicide fuel. In an effort to better detail the U-Si binary phase diagram, the 44-60 at.% Si region of the U-Si phase diagram was investigated experimentally by analyzing samples with nominal compositions U/Si = 5/4, U/Si = 1/1 and U/Si = 2/3 using SEM-EDS, XRD, and high temperature time-of-flight neutron diffraction, supported by DFT calculations. Both the U/Si = 5/4 and the U/Si = 2/3 samples were composed of two phases, U3Si2 + USi and USi + U3Si5 for U/Si = 5/4 and U/Si = 2/3, respectively. Both U5Si4 and U2Si3 were found from DFT calculations to have imaginary phonon frequencies and an enthalpy of formation above the U-Si convex hull, and thus likely to be thermodynamically unstable compared to the other phases, consistent with the experimental results.
机译：近年来，金属间化合物U3SI2已获得兴趣，因为它具有在与UO 2相比的高导热率，合理高熔点和高铀密度的组合，因此在轻水反应器中使用的意外耐受燃料。虽然U3SI2具有很好的表征，但U-Si系统中的剩余阶段存在尺寸，这可能是硅化物燃料的潜在裂变产物。为了更好地详细说明U-Si二进制相图，通过分析具有标称组合物U / Si = 5/4，U / Si的样品来实验研究了U-Si相图的％Si区域。使用SEM-EDS，XRD和高温飞行时间中子衍射，由DFT计算支持1/1和U / SI = 2/3。 U / Si = 5/4和U / Si = 2/3样本分别由两个阶段，U3SI2 + USI和USI + U3SI5分别组成，分别为U / Si = 5/4和U / Si = 2/3组成。从DFT计算中发现了U5SI4和U2SI3，以在U-Si凸壳上方具有映像声子频率和形成的形成焓，因此与其他阶段相比，可能是热力学上不稳定的，这与实验结果一致。

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