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Release of helium from vacancy defects in yttria-stabilized zirconia under irradiation

机译:辐照下氧化钇稳定氧化锆中空位缺陷中的氦释放

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摘要

Fission gas retention or release has a critical impact on the function of advanced nuclear materials. Helium trapping in, and release from, radiation defects induced by neutrons and by α decay in YSZ (yttria-stabilized zirconia) is experimentally simulated using synchronized Zr~+ and He~+ dual ion beam irradiation. The measured damage profiles consist of two peaks which agree well with the calculated profiles of implantation induced excess point defects. This special implantation related effect has to be carefully considered in the evaluation of experimental investigations which simulate isotropic irradiation effects such as α decay. First-principles calculations show that helium is energetically favorable to be trapped by Zr vacancies in YSZ. Implanted helium alone in YSZ is accumulated in undesirable helium bubbles and results in local surface swelling and lift-off. However, under dual beam irradiation helium is released from vacancy defects and is out-diffused at room temperature. Helium is mobilized by a vacancy-assisted trapping/detrapping mechanism induced by the simultaneous Zr~+ ion implantation. This behavior avoids the deleterious helium bubble formation and contributes to the suitable application characteristics of YSZ which result in its excellent radiation hardness.
机译:裂变气体的保留或释放对先进核材料的功能具有至关重要的影响。使用同步的Zr〜+和He〜+双离子束辐射,通过实验模拟了氦气在中子和YSZ(氧化钇稳定的氧化锆)中由α衰变引起的辐射缺陷中的俘获和释放。测得的损伤轮廓由两个峰组成,这两个峰与计算得出的注入引起的过高点缺陷的轮廓非常吻合。在与模拟各向同性辐射效应(例如α衰变)的实验研究进行评估时,必须仔细考虑这种与植入有关的特殊效应。第一性原理计算表明,氦气在能量上有利于被YSZ中的Zr空位捕获。 YSZ中单独注入的氦气会堆积在不良的氦气气泡中,并导致局部表面膨胀和剥离。但是,在双光束照射下,氦会从空位缺陷中释放出来,并且在室温下会扩散出去。氦是通过同时注入Zr〜+离子引起的空位辅助的俘获/俘获机制而动员的。这种行为避免了有害的氦气气泡的形成,并有助于YSZ的合适应用特性,从而使其具有出色的辐射硬度。

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  • 来源
    《Physical review》 |2012年第22期|224103.1-224103.7|共7页
  • 作者单位

    Helmholtz-Zentrum Dresden-Rossendorf(HZDR)e.V, P.O. Box 510119, 01314 Dresden, Germany;

    Helmholtz-Zentrum Dresden-Rossendorf(HZDR)e.V, P.O. Box 510119, 01314 Dresden, Germany;

    Department ofPhysics, Beihang University, Beijing 100191, China;

    Helmholtz-Zentrum Dresden-Rossendorf(HZDR)e.V, P.O. Box 510119, 01314 Dresden, Germany;

    Helmholtz-Zentrum Dresden-Rossendorf(HZDR)e.V, P.O. Box 510119, 01314 Dresden, Germany;

    Helmholtz-Zentrum Dresden-Rossendorf(HZDR)e.V, P.O. Box 510119, 01314 Dresden, Germany;

    Helmholtz-Zentrum Dresden-Rossendorf(HZDR)e.V, P.O. Box 510119, 01314 Dresden, Germany;

    Helmholtz-Zentrum Dresden-Rossendorf(HZDR)e.V, P.O. Box 510119, 01314 Dresden, Germany;

    Helmholtz-Zentrum Dresden-Rossendorf(HZDR)e.V, P.O. Box 510119, 01314 Dresden, Germany;

    Helmholtz-Zentrum Dresden-Rossendorf(HZDR)e.V, P.O. Box 510119, 01314 Dresden, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    insulators;

    机译:绝缘子;

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