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Cation and vacancy disorder in U_(1-y)Nd_yO_(2.00-x) alloys

机译:U_(1-y)Nd_yO_(2.00-x)合金中的阳离子和空位紊乱

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摘要

In the present article, the intermixing and clustering of U/Nd, O, and vacancies were studied by both laboratory and synchrotron-based x-ray diffraction in U_(1-y)Nd_yO_(2-x) alloys. It was found that an increased holding time at the high experimental temperature during initial alloy preparation results in a lower disorder of the Nd distribution in the alloys. Adjustment of the oxygen concentration in the U_(1-y)Nd_yO_(2-x) alloys with different Nd concentrations was accompanied by the formation of vacancies on the oxygen sublattice and a nanocrystalline component. The lattice parameters in the U_(1-y)Nd_yO_(2-x) alloys were also found to deviate significantly from Vegard's law when the Nd concentration was high (53%) and decreased with increasing oxygen concentration. Such changes indicate the formation of large vacancy concentrations during oxygen adjustment at these high temperatures. The change in the vacancy concentration after the oxygen adjustment was estimated relative to Nd concentration and oxygen stoichiometry.
机译:在本文中,通过U_(1-y)Nd_yO_(2-x)合金的实验室和基于同步加速器的x射线衍射研究了U / Nd,O和空位的混合和聚集。发现在初始合金制备期间在高实验温度下增加的保持时间导致合金中Nd分布的无序度降低。调整具有不同Nd浓度的U_(1-y)Nd_yO_(2-x)合金中的氧浓度会伴随在氧亚晶格和纳米晶成分上形成空位。当Nd浓度高(53%)时,随着氧浓度的升高,U_(1-y)Nd_yO_(2-x)合金的晶格参数也明显偏离Vegard定律。这种变化表明在这些高温下的氧气调节过程中会形成大量的空位浓度。相对于Nd浓度和氧气化学计量,估计了氧气调节后空位浓度的变化。

著录项

  • 来源
    《Journal of Materials Research》 |2015年第20期|3026-3040|共15页
  • 作者单位

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Fuel Cycle and Isotopes Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Mechanical Engineering, University of Wyoming, Laramie, WY 82071, USA;

    Nuclear Engineering Department, College of Engineering and Computing, The University of South Carolina, Columbia, South Carolina 29208, USA;

    Nuclear Engineering Department, College of Engineering and Computing, The University of South Carolina, Columbia, South Carolina 29208, USA;

    Nuclear Science and Technology Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    Nuclear Science and Technology Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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