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Oxygen vacancies in LiAlO_2 crystals

机译：LiAlO_2晶体中的氧空位

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摘要

Singly ionized oxygen vacancies are produced in LiAlO_2 crystals by direct displacement events during a neutron irradiation. These vacancies, with one trapped electron, are referred to as V_O~+ centers. They are identified and characterized using electron paramagnetic resonance (EPR) and optical absorption. The EPR spectrum from the V_O~+ centers is best monitored near 100 K with low microwave power. When the magnetic field is along the [001] direction, this spectrum has a g value of 2.0030 and well-resolved hyperfine interactions of 310 and 240 MHz with the two ~(27)Al nuclei that are adjacent to the oxygen vacancy. A second EPR spectrum, also showing hyperfine interactions with two ~(27)Al nuclei, is attributed to a metastable state of the V_O~+ center. An optical absorption band peaking near 238 nm is assigned to V_O~+ centers. Bleaching light from a Hg lamp converts a portion of the V_O~+ centers to V_O~0 centers (these latter centers are oxygen vacancies with two trapped electrons). The V_O~0 centers have an absorption band peaking near 272 nm, a photoluminescence band peaking near 416 nm, and a photoluminescence excitation band peaking near 277 nm. Besides the oxygen-vacancy EPR spectra, a holelike spectrum with a resolved, but smaller, hyperfine interaction with one ~(27)Al nucleus is present in LiAlO_2 after the neutron irradiation. This spectrum is tentatively assigned to doubly ionized aluminum vacancies.
机译：在LiAlO_2晶体中，通过中子辐照过程中的直接位移事件会产生单离子化的氧空位。这些具有一个被俘获的电子的空位称为V_O〜+中心。使用电子顺磁共振（EPR）和光吸收对其进行鉴定和表征。来自V_O〜+中心的EPR频谱最好在100 K附近以低微波功率进行监控。当磁场沿[001]方向时，该光谱的g值为2.0030，并且与310个和（27）Al原子核相邻的与氧空位相邻的超精细相互作用（分别为310和240 MHz）得到了很好的解析。第二个EPR光谱也显示了与两个〜（27）Al核的超精细相互作用，这归因于V_O〜+中心的亚稳态。在238nm附近达到峰值的光吸收带被分配给V_O〜+中心。来自Hg灯的漂白光将V_O〜+中心的一部分转换为V_O〜0中心（这些后面的中心是带有两个捕获电子的氧空位）。 V_0〜0中心具有在272nm附近达到峰值的吸收带，在416nm附近达到峰值的光致发光带以及在277nm附近达到峰值的光致发光激发带。 LiAlO_2中子辐照后，除了氧空位EPR光谱外，在LiAlO_2中还存在一个孔状光谱，该光谱具有分辨的但较小的与一个〜（27）Al核的超精细相互作用。该光谱暂定分配给双电离的铝空位。

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  • 来源
    《Physical review》 |2015年第14期|144108.1-144108.9|共9页
  • 作者

    M. S. Holston; I. P. Ferguson; J. W. McClory; N. C. Giles; L. E. Halliburton;

  • 作者单位

    Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio 45433, USA;

    Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio 45433, USA;

    Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio 45433, USA;

    Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio 45433, USA;

    Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506, USA;

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  • 正文语种 eng
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  • 关键词

    color centers and other defects; other solid inorganic materials; neutron radiation effects;

    机译：色心和其他缺陷;其他固体无机材料;中子辐射效应;

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