Structure and Dynamics of Excited States in Glasses Studied by Pulsed Neutron Scattering

脉冲中子散射研究玻璃激发态的结构和动力学

基本信息

项目摘要

The dynamical structure factors S(Q,E) of SiOィイD22ィエD2 glass and NiィイD267ィエD2ZrィイD233ィエD2 glass were measured by inelastic neutron scattering. The advance of pulsed neutron scattering technique enabled us to obtain the S(Q,E) in a wide momentum-energy space with high resolution and high neutron flux.The dispersive excitations in these glasses are clearly observed for the first time, whose periodicity is defined by the respective static structure factors S(Q). This feature suggests the existence of quasi-Brillouine zone which originate from short range structure. However, the first sharp diffraction peak in S(Q), which correlate with the medium range order of glass structure, has no relation with dispersive behavior. The dispersive excitations in SiOィイD22ィエD2 glass is acoustic-like behavior, while that of NiィイD267ィエD2ZrィイD233ィエD2 glass optic-like one. This difference may be attributed to the rigidity of short range structure. It is considered that NiィイD267ィエD2ZrィイD233ィエD2 glass has no rigid structural units which surely appear in SiOィイD22ィエD2 glass. The Boson peak, which is a universal feature of glassy materials, is also proved to be strongly localized mode.It must be noted that the dispersive behavior exists above the energy range of Boson peak. Our result is contrary to the Ioffe-Regel criteria which argue that no collective excitations should exist above an energy determined from correlation length of local density fluctuation. We can say that the observations of dynamic structure factor S(Q,E) over a wide range of momentum-energy space bring us fruitful information on structure and dynamics of glassy materials.
SIOI D22玻璃和NII D267 D2ZR D233 D2玻璃的动态结构因子S(Q,E)通过非弹性中子散射测量。脉冲中子散射技术的发展使我们能够在具有高分辨率和高中子通量的宽动量能量空间中获得S(Q,e)。这些眼镜中的分散兴奋首次清楚地观察到其周期性,其周期性由相应的静态结构因子S(q)定义。此功能表明存在源自短范围结构的准奶油区。但是,S(Q)中的第一个尖锐衍射峰与玻璃结构的中等范围相关,与分散行为无关。 SIOI D22玻璃中的色散兴奋是原声的行为,而NII D267 D2ZRI D233 D233 D2 D2 D2玻璃视觉效果类似。这种差异可能归因于短距离结构的刚度。据认为,NII D267 D2ZR D233 D2 D2玻璃没有刚性的结构单元,肯定会出现在SIO D22玻璃中。玻色子峰是玻璃材料的通用特征,也被证明是强烈的局部模式。必须注意的是,分散行为存在于玻色峰的能量范围以上。我们的结果与Ioffe-Regel标准进行了对比,该标准认为,不应在局部密度波动的相关长度下确定的能量以上不应存在集体兴奋。我们可以说,动态结构因子S(Q,e)的观察结果在各种动量 - 能量空间中为我们带来了有关玻璃材料结构和动力学的富有成果的信息。

项目成果

期刊论文数量(25)
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E. Rat et al.: "Observation of the Crossover to Strong Scattering of Acoustic Phonons in Densified Silica"Physical Review Letters. 83. 1355-1358 (1999)
E. Rat 等人:“致密二氧化硅中声学声子的交叉到强散射的观察”物理评论快报。
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H.Nojiri,K.Takahashi,M.Arai,M.Motokawa他: "Neutron diffraction experiments in repeating pulsed high magnetic fields" Physica B. 241-243. 175-178 (1998)
H. Nojiri、K. Takahashi、M. Arai、M. Motokawa 等人:“重复脉冲高磁场中的中子衍射实验”Physica B. 241-243 (1998)。
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M.Arai et al.: "Incommensurate Spin Dynamics of Underdoped Superconductor YBa2Cu3O6.7"Physical Review Letters. 83. 608-611 (1999)
M.Arai 等人:“欠掺杂超导体 YBa2Cu3O6.7 的不相称自旋动力学”物理评论快报。
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M. Arai et al.: "Novel dynamics of vitreous silica and metallic glass"Philosophical Magazine B. 79. 1733-1739 (1999)
M. Arai 等人:“玻璃二氧化硅和金属玻璃的新颖动力学”哲学杂志 B. 79. 1733-1739 (1999)
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Y.Inamura,M.Arai他: "Intermediate-range structure and low-energy dynamics of densified SiO2 glass" Physica B. 241-243. 903-905 (1998)
Y. Inamura、M. Arai 等人:“致密 SiO2 玻璃的中程结构和低能动力学”Physica B. 241-243 (1998)。
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前往

ARAI Masatoshi的其他基金

Development of the 4D Spaces Access Neutron Spectrometer (4SEASONS) and Elucidation of the Mechanism of Oxide High-Tc Superconductivity
4D空间存取中子能谱仪(4SEASONS)的研制及氧化物高温超导机理的阐明
  • 批准号:
    17001001
    17001001
  • 财政年份:
    2005
  • 资助金额:
    $ 8.19万
    $ 8.19万
  • 项目类别:
    Grant-in-Aid for Specially Promoted Research
    Grant-in-Aid for Specially Promoted Research
UK Japan Collaboration on Intense Pulsed Neutron Scattering Experiments
英日合作进行强脉冲中子散射实验
  • 批准号:
    13304032
    13304032
  • 财政年份:
    2001
  • 资助金额:
    $ 8.19万
    $ 8.19万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
    Grant-in-Aid for Scientific Research (A)
Development of a new neutron scattering instrument under UK-Japan colaboration
英日合作开发新型中子散射仪器
  • 批准号:
    10044101
    10044101
  • 财政年份:
    1998
  • 资助金额:
    $ 8.19万
    $ 8.19万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A).
    Grant-in-Aid for Scientific Research (A).
Neutron Scattering of Magnetic Systems in Mulfi-Ertreme Condition.
多重极端条件下磁系统的中子散射。
  • 批准号:
    07454083
    07454083
  • 财政年份:
    1995
  • 资助金额:
    $ 8.19万
    $ 8.19万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
    Grant-in-Aid for Scientific Research (B)

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    1505621
    1505621
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  • 项目类别:
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