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锆掺杂二氧化铀中氧缺陷扩散机制的密度泛函计算研究

张瑞谦 肖红星 王欢 张仲 邹宇 展长勇 伍建春

张瑞谦, 肖红星, 王欢, 张仲, 邹宇, 展长勇, 伍建春. 锆掺杂二氧化铀中氧缺陷扩散机制的密度泛函计算研究[J]. 原子核物理评论, 2017, 34(3): 667-671. doi: 10.11804/NuclPhysRev.34.03.667
引用本文: 张瑞谦, 肖红星, 王欢, 张仲, 邹宇, 展长勇, 伍建春. 锆掺杂二氧化铀中氧缺陷扩散机制的密度泛函计算研究[J]. 原子核物理评论, 2017, 34(3): 667-671. doi: 10.11804/NuclPhysRev.34.03.667
ZHANG Ruiqian, XIAO Hongxing, WANG Huan, ZHANG Zhong, ZOU Yu, ZHAN Changyong, WU Jianchun. Migration Mechanism of Oxygen in Uranium Dioxide Doped with Zirconium[J]. Nuclear Physics Review, 2017, 34(3): 667-671. doi: 10.11804/NuclPhysRev.34.03.667
Citation: ZHANG Ruiqian, XIAO Hongxing, WANG Huan, ZHANG Zhong, ZOU Yu, ZHAN Changyong, WU Jianchun. Migration Mechanism of Oxygen in Uranium Dioxide Doped with Zirconium[J]. Nuclear Physics Review, 2017, 34(3): 667-671. doi: 10.11804/NuclPhysRev.34.03.667

锆掺杂二氧化铀中氧缺陷扩散机制的密度泛函计算研究

doi: 10.11804/NuclPhysRev.34.03.667
基金项目: 中国核动力设计院反应堆燃料及材料重点实验室基金;国家自然科学基金资助项目(11405111,11205107)
详细信息
    作者简介:

    张瑞谦(1981-),男,四川南充人,副研究员,博士,从事核燃料循环与材料研究;E-mail:zhangruiqian@126.com

    通讯作者: 伍建春,E-mail:jcwu@scu.edu.cn
  • 中图分类号: O483

Migration Mechanism of Oxygen in Uranium Dioxide Doped with Zirconium

Funds: Foundation of National Key Laboratory for Nuclear Fuel and Materials; National Natural Science Foundation of China(11405111, 11205107)
More Information
    Corresponding author: 10.11804/NuclPhysRev.34.03.667
  • 摘要: 应用基于量子力学的密度泛函计算和过渡态搜寻的CI-NEB方法,研究了锆掺杂前后二氧化铀晶格中氧空位和氧间隙本征缺陷的扩散机理,计算了扩散路径和扩散能垒。计算结果表明,锆掺杂使得氧空位缺陷<100>方向的扩散能垒降低了0.40 eV,氧间隙交换机制的扩散能垒降低了0.07 eV。锆掺杂后,氧空位远低于氧间隙缺陷的扩散能垒。最后分析了扩散过程中氧原子和金属原子之间的键长,说明锆掺杂导致点缺陷扩散能垒降低与晶格畸变密切相关。


    Oxygen vacancy and interstitial diffusion mechanisms in uranium dioxide doped with zirconium are investigated by the density functional theory calculations. The migration pathways and barriers are identified using the climbing-image nudge elastic band (CI-NEB) method. It is found that the vacancy migration barrier along the <100> direction decreases by about 0.40 eV, while the indirect interstitial migration barrier decreases by about 0.07 eV in the zirconium doped uranium dioxide. The oxygen vacancy migration barrier is far lower than the oxygen interstitial migration barrier in the uranium dioxide doped with zirconium. Based on the analysis of bond length of local structures during the migration of oxygen atoms, it is concluded that the lattice distortion may be responsible for the reduction of oxygen migration barrier.
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出版历程
  • 收稿日期:  2016-12-08
  • 修回日期:  2016-12-08
  • 刊出日期:  2017-07-18

锆掺杂二氧化铀中氧缺陷扩散机制的密度泛函计算研究

doi: 10.11804/NuclPhysRev.34.03.667
    基金项目:  中国核动力设计院反应堆燃料及材料重点实验室基金;国家自然科学基金资助项目(11405111,11205107)
    作者简介:

    张瑞谦(1981-),男,四川南充人,副研究员,博士,从事核燃料循环与材料研究;E-mail:zhangruiqian@126.com

    通讯作者: 伍建春,E-mail:jcwu@scu.edu.cn
  • 中图分类号: O483

摘要: 应用基于量子力学的密度泛函计算和过渡态搜寻的CI-NEB方法,研究了锆掺杂前后二氧化铀晶格中氧空位和氧间隙本征缺陷的扩散机理,计算了扩散路径和扩散能垒。计算结果表明,锆掺杂使得氧空位缺陷<100>方向的扩散能垒降低了0.40 eV,氧间隙交换机制的扩散能垒降低了0.07 eV。锆掺杂后,氧空位远低于氧间隙缺陷的扩散能垒。最后分析了扩散过程中氧原子和金属原子之间的键长,说明锆掺杂导致点缺陷扩散能垒降低与晶格畸变密切相关。


Oxygen vacancy and interstitial diffusion mechanisms in uranium dioxide doped with zirconium are investigated by the density functional theory calculations. The migration pathways and barriers are identified using the climbing-image nudge elastic band (CI-NEB) method. It is found that the vacancy migration barrier along the <100> direction decreases by about 0.40 eV, while the indirect interstitial migration barrier decreases by about 0.07 eV in the zirconium doped uranium dioxide. The oxygen vacancy migration barrier is far lower than the oxygen interstitial migration barrier in the uranium dioxide doped with zirconium. Based on the analysis of bond length of local structures during the migration of oxygen atoms, it is concluded that the lattice distortion may be responsible for the reduction of oxygen migration barrier.

English Abstract

张瑞谦, 肖红星, 王欢, 张仲, 邹宇, 展长勇, 伍建春. 锆掺杂二氧化铀中氧缺陷扩散机制的密度泛函计算研究[J]. 原子核物理评论, 2017, 34(3): 667-671. doi: 10.11804/NuclPhysRev.34.03.667
引用本文: 张瑞谦, 肖红星, 王欢, 张仲, 邹宇, 展长勇, 伍建春. 锆掺杂二氧化铀中氧缺陷扩散机制的密度泛函计算研究[J]. 原子核物理评论, 2017, 34(3): 667-671. doi: 10.11804/NuclPhysRev.34.03.667
ZHANG Ruiqian, XIAO Hongxing, WANG Huan, ZHANG Zhong, ZOU Yu, ZHAN Changyong, WU Jianchun. Migration Mechanism of Oxygen in Uranium Dioxide Doped with Zirconium[J]. Nuclear Physics Review, 2017, 34(3): 667-671. doi: 10.11804/NuclPhysRev.34.03.667
Citation: ZHANG Ruiqian, XIAO Hongxing, WANG Huan, ZHANG Zhong, ZOU Yu, ZHAN Changyong, WU Jianchun. Migration Mechanism of Oxygen in Uranium Dioxide Doped with Zirconium[J]. Nuclear Physics Review, 2017, 34(3): 667-671. doi: 10.11804/NuclPhysRev.34.03.667
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