用于惰性基质燃料应用的Nd x Sc y Zr 1– x – y O 2−δ材料的热稳定性研究,Inorganic Chemistry

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用于惰性基质燃料应用的Nd _x Sc _y Zr _{1– x – y} O _2−δ材料的热稳定性研究
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2016-01-11 00:00:00 , DOI: 10.1021/acs.inorgchem.5b01886
John R. Hayes ₁ , Andrew P. Grosvenor ₁ , Mouna Saoudi ₂

Affiliation

惰性基质燃料（IMF）由嵌入中子透明（惰性）基质中的超铀元素（即Pu，Am，Np，Cm）组成，可用于“燃烧”（转化）当前或第四代核燃料中的这些元素反应堆。氧化钇稳定的氧化锆已在IMF应用中进行了广泛的研究，但这种材料的低导热性限制了其实用性。可以使用其他元件来稳定立方氧化锆结构，并且可以通过使用较轻的稳定元件来增加燃料的热导率。为此，一系列Nd _x Sc _y Zr _{1– x – y} O _2−δ通过共沉淀反应合成了多种材料，并通过多种技术对其进行了表征（Nd被用作Am的替代物）。使用粉末X射线衍射，扫描电子显微镜和X射线吸收光谱研究了这些材料的长距离和局部结构。另外，已经通过在1100和1400°C下对材料进行退火研究了这些材料在一定温度范围内的稳定性。结果表明，钕_X钪_ý的Zr _{1- X - Ÿ} ö _2-δ的材料保持在退火后在仅当钕和Sc都存在与高温单立方相ÿ ≥0.10和X + ÿ > 0.15。

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Investigation of the Thermal Stability of NdxScyZr1–x–yO2−δ Materials Proposed for Inert Matrix Fuel Applications

Inert matrix fuels (IMF) consist of transuranic elements (i.e., Pu, Am, Np, Cm) embedded in a neutron transparent (inert) matrix and can be used to “burn up” (transmute) these elements in current or Generation IV nuclear reactors. Yttria-stabilized zirconia has been extensively studied for IMF applications, but the low thermal conductivity of this material limits its usefulness. Other elements can be used to stabilize the cubic zirconia structure, and the thermal conductivity of the fuel can be increased through the use of a lighter stabilizing element. To this end, a series of Nd_xSc_yZr_1–x–yO_2−δ materials has been synthesized via a co-precipitation reaction and characterized by multiple techniques (Nd was used as a surrogate for Am). The long-range and local structures of these materials were studied using powder X-ray diffraction, scanning electron microscopy, and X-ray absorption spectroscopy. Additionally, the stability of these materials over a range of temperatures has been studied by annealing the materials at 1100 and 1400 °C. It was shown that the Nd_xSc_yZr_1–x–yO_2−δ materials maintained a single cubic phase upon annealing at high temperatures only when both Nd and Sc were present with y ≥ 0.10 and x + y > 0.15.

更新日期：2016-01-11

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