Structural Studies of Supercritical Fluid Metals using Synchrotron Radiation
Structural Studies of Supercritical Fluid Metals using Synchrotron Radiation
批准号:
11102004
负责人:
TAMURA Kozaburo
金额:
$168.9万
依托单位国家:
日本
项目类别:
Grant-in-Aid for Specially Promoted Research
财政年份:
1999
资助国家:
日本
项目状态:
已结题
起止时间:
1999 至 2003
中文摘要
我们已经进行了结构研究的扩展流体金属,如汞,Rb和硒的金属-非金属(M-NM)过渡的重点。这些物质是典型的例子,其中M-NM过渡离子发生体积膨胀。Hg是二价金属,发生Wilson型的M-NM跃迁。在流体Rb的M-NM跃迁中,电子关联起着关键的作用。Se是一种液态半导体,它表现出膨胀的超导体-金属-绝缘体转变,我们测量了在2000 K和2000 bar压力下,在从液态到稠密蒸气的宽密度区,在液-汽临界点附近的He气体压缩下的X射线衍射、小角X射线散射和非弹性X射线散射,利用SPring-8上的同步辐射积累了S(Q),g(r),S(Q,ω)等静态和动态的结构数据。我们得到了重要的结果,表明M-NM跃迁和结构变化之间的强相关性。例如,流体Hg的小角X射线散射测量显示,伴随着M-NM转变出现了弱的密度波动。从流体Hg的非弹性X射线散射测量中,我们观察到在M-NM过渡区的快声。声速是超声波速度的三倍。快声与局域结构中nm和ps时空尺度的涨落密切相关,这种涨落可能导致M-NM跃迁。在Rb和Se中,我们也得到了重要的结果。对于流体Rb,我们已经开发了一个钼电池,使用它使我们的结构研究到超临界区域。
英文摘要
We have performed structural investigations on expanded fluid metals such as Hg, Rb and Se focusing on the metal-nonmetal (M-NM) transition. These substances are typical examples in which the M-NM transit ion occurs with volume expansion. Hg is a divalent metal and the M-NM transition with the Wilson type takes place. In the M-NM transition of fluid Rb the electron correlation is considered to play a key role. Se is a liquid semiconductor which shows the semiconductor-metal-insulator transition with expansion.We have measured x-ray diffraction, small angle x-ray scattering and inelastic x-ray scattering at temperatures up to 2000 K and pressures up to 2000 bar with He gas compression, in the wide density region from liquid to dense vapor surrounding the liquid-vapor critical point, by the use of synchrotron radiation at SPring-8. We have accumulated structural data of static and dynamic ones such as S(Q), g(r) and S(Q,ω). We have obtained important results showing strong correlation between the M-NM transition and the structural change. For example, small angle x-ray scattering measurements for fluid Hg reveals that a weak density fluctuation appears accompanying the M-NM transition. From the inelastic x-ray scattering measurement for fluid Hg we have observed a fast sound at the M-NM transition region. The sound velocity is triple the ultrasonic velocity. The fast sound is strongly connected with the fluctuation in the local structure with the time-and-space scale of nm and ps which may induce the M-NM transition. In Rb and Se we have also obtained important results. For fluid Rb we have developed a molybdenum cell the use of which enabled us the structural studies up to the supercritical region.
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F.Shimojo: "Bonding Properties of Liquid Tellurium under Pressure : A Maximally Localized Wannier Function Approach with Ultrasoft Pseudo-potentials"J.Phys.Soc.Jpn.. 72. 2417-2420 (2003)
F.Shimojo:“压力下液态碲的结合特性:具有超软赝势的最大局域万尼尔函数方法”J.Phys.Soc.Jpn.. 72. 2417-2420 (2003)
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T.Itami: "Structure of liquid Sn over a wide temperature range from neutron scattering experiments and first-principles molecular dynamics simulation : A comparison to liquid Pb"Phys.Rev.B. 67. 064201 (2003)
T.Itami:“中子散射实验和第一原理分子动力学模拟在宽温度范围内的液态锡结构:与液态铅的比较”Phys.Rev.B。
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K.Matsuda: "Molybdenum cell for x-ray diffraction measurements of f luid alkali metals at high temperatures and high pressures"Rev.Sci.Instrum.. 75. 709-712 (2004)
K.Matsuda:“用于高温高压下流体碱金属 X 射线衍射测量的钼池”Rev.Sci.Instrum.. 75. 709-712 (2004)
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R.Goto: "The Semiconductor-Metal Transition in the Liquid In_2Te_3, Studied by ab initio Molecular-Dynamics Simulations"J.Phys.Soc.Jpn.. 73. 956-963 (2004)
R.Goto:“液体 In_2Te_3 中的半导体-金属转变,从头开始分子动力学模拟研究”J.Phys.Soc.Jpn.. 73. 956-963 (2004)
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K.Tamura, M.Inui, I.Nakaso, Y.Oh'ishi, K.Funakoshi, W.Utsumi: "Structural studies of expanded fluid mercury using synchrotron radiation"J.Non-Cryst.Solids. 250-252. 148-153 (1999)
K.Tamura、M.Inui、I.Nakaso、Y.Ohishi、K.Funakoshi、W.Utsumi:“使用同步加速器辐射对膨胀流体汞进行结构研究”J.Non-Cryst.Solids。
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共 151 条
Compton Scattering Measurements for Expanded Fluid Alkali Metals : Studies on the Instability of the Low-density Electron Gas
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批准号:19204040
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项目类别:Grant-in-Aid for Scientific Research (A)
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资助金额:$25.71万
-
财政年份:2007
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负责人:TAMURA Kozaburo
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依托单位:
STUDIES ON STATIC AND DYNAMIC STRUCTURE OF EXPANDING FLUID ALKALI METALS BY USING SYNCHROTRON RADIATION
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批准号:16206063
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项目类别:Grant-in-Aid for Scientific Research (A)
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资助金额:$23.46万
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财政年份:2004
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负责人:TAMURA Kozaburo
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依托单位:
Photo-induced Structural Change and the Relaxation in Liquid Sulfur
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批准号:07454066
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$0.32万
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财政年份:1995
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负责人:TAMURA Kozaburo
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依托单位:
The semiconductor-metal transition and the structural change in fluid selenium near the liquid-gas critical point.
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批准号:02452042
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项目类别:Grant-in-Aid for General Scientific Research (B)
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资助金额:$4.42万
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财政年份:1990
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负责人:TAMURA Kozaburo
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依托单位:
海外基金