Studies on Molecular Dissociation and Metallization of Molecular crystals under High Pressure

高压下分子晶体的分子解离和金属化研究

基本信息

  • 批准号:
    07454154
  • 负责人:
  • 金额:
    $ 4.61万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    1995
  • 资助国家:
    日本
  • 起止时间:
    1995 至 1996
  • 项目状态:
    已结题

项目摘要

1. Structural Phase Transition and Metallization of Solid OxygenThe insulator-metal transition of solid oxygen has been suggested from the slight increase of the refrectivity at pressure around 100 GPa. We have observed the isostructural phase transition from the epsilon phase to the zeta phase at 96 GPa. The both phases are assigned to a monoclinic lattice. The transition is responsible for the metallization of solid oxygen. At the transition, the monoclinic angle and the molar volume were scarcely changed. To reveal the mechanism of the metallization, we have performed Raman studies on solid oxygen under pressure of up to 110 GPa. At pressure of below the transition, a vibrational mode and librational modes were clearly observed and the frequency of the vibrational mode monotonically increased, but any peak of the Raman active modes was not observed at pressure of above the transition. The monotonical increase of the frequency suggests that oxygen molecules were not dissociated at the transition. Now we conclude that the metallization of solid oxygen is realized through the mechanism of the band overlapping. We also proposed the space group of the epsilon phase as C2/m.2. Pressure-induced structural phase transition of Se and CX_4 (X=F,Cl, Br)Pressure-induced structural phase transitions of CX_4 compounds (X=F,C1 and Br) have been investigated. Selenium has several allotropic modifications at ambient conditions. The molecular dissociation and the metallization of these modifications were also studied.
1.固体氧的结构相变和金属化从100 Gpa附近的折射率略有增加,推测了固体氧的绝缘体-金属相变。我们在96 Gpa观察到了从epsilon相到Zeta相的等结构相变。这两个相都被指定为单斜晶格。这一转变导致了固态氧的金属化。在相变过程中,单斜角和摩尔体积变化不大。为了揭示金属化的机制,我们在高达110 Gpa的压力下对固体氧进行了拉曼光谱研究。在低于跃迁的压力下,观察到明显的振动模和振动模,并且振动模的频率单调增加,但在高于跃迁的压力下没有观察到任何拉曼活性模式的峰值。频率的单调增加表明,氧分子在转变过程中没有解离。现在我们得出结论,固态氧的金属化是通过能带重叠的机制实现的。我们还提出了epsilon相的空间群为C2/M.2。本文研究了Se和CX_4(X=F,Cl,Br)的压力诱导结构相变。在环境条件下,硒有几种同素异构性修饰。对这些修饰的分子解离和金属化进行了研究。

项目成果

期刊论文数量(18)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Y.Akahama: "High-pressure Raman Spectroscopy of Solid Oxygen" Phys.Rev.54B(22). R15602-R15605 (1996)
Y.Akahama:“固体氧的高压拉曼光谱”Phys.Rev.54B(22)。
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Y.Akahama: "New High-pressure structural Transition of Oxygen at 96 GPa Associated with Metallization in a Mdecular Solid" Phys.Rev.Lett.74(23). 4690-4693 (1995)
Y.Akahama:“96 GPa 下氧的新高压结构转变与分子固体中的金属化相关”Phys.Rev.Lett.74(23)。
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Y. Nishiumi: "Structural Studies on Bromobenzene under High Pressure" High Pressure Research. (in the press). (1997)
Y. Nishiumi:“高压下溴苯的结构研究”高压研究。
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Y.Akahama: "New Structural Transition of Oxygen at 96 GPa" Proc.Joint XV AIRAPT and XXXIII EHPRG. 360-362 (1996)
Y.Akahama:“96 GPa 下氧的新结构转变”Proc.Joint XV AIRAPT 和 XXXIII EHPRG。
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    0
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Y.Akahama: "High-Pressure Raman Spectroscopy of Solid Oxygen" Phy. Rev. 54B (22). R15602-R15605 (1996)
Y.Akahama:“固体氧的高压拉曼光谱”Phy。
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KAWAMURA Haruki其他文献

KAWAMURA Haruki的其他文献

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{{ truncateString('KAWAMURA Haruki', 18)}}的其他基金

Study on order-disorder transition in solid hydrogen at high pressures
高压固态氢有序-无序转变研究
  • 批准号:
    19550024
  • 财政年份:
    2007
  • 资助金额:
    $ 4.61万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Study on crystal structures and compressibilities of solid hydrogen and transition metal hydrides at high pressures and high temperatures
高压高温下固态氢和过渡金属氢化物的晶体结构和压缩性研究
  • 批准号:
    16340132
  • 财政年份:
    2004
  • 资助金额:
    $ 4.61万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Development of high pressure techniques above 100 GPa and their application to materials in the core
100 GPa以上高压技术的开发及其在堆芯材料中的应用
  • 批准号:
    12126204
  • 财政年份:
    2000
  • 资助金额:
    $ 4.61万
  • 项目类别:
    Grant-in-Aid for Scientific Research on Priority Areas
X-ray diffraction analysis of solid hydrogen
固体氢的X射线衍射分析
  • 批准号:
    11440125
  • 财政年份:
    1999
  • 资助金额:
    $ 4.61万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
Pressure-Induced Phase Transformation of Quasicrystals
准晶的压力诱导相变
  • 批准号:
    03650530
  • 财政年份:
    1991
  • 资助金额:
    $ 4.61万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)

相似海外基金

Chemical States of Fe atoms Implanted into Solid Oxygen
植入固体氧中的铁原子的化学状态
  • 批准号:
    15550058
  • 财政年份:
    2003
  • 资助金额:
    $ 4.61万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Structural analysis and physical properties of High-Pressure and Low-Temperature Phases of Solid Oxygen
固氧高压低温相的结构分析和物理性质
  • 批准号:
    12640321
  • 财政年份:
    2000
  • 资助金额:
    $ 4.61万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Structural and Optical Studies of High-Pressure Phases of Solid Oxygen
固体氧高压相的结构和光学研究
  • 批准号:
    10440093
  • 财政年份:
    1998
  • 资助金额:
    $ 4.61万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Thoretical Study on Electronic Structures and Pressure-Induced Composite Phase Transitions of Solid Oxygen
固氧电子结构与压力诱导复合相变的理论研究
  • 批准号:
    09640433
  • 财政年份:
    1997
  • 资助金额:
    $ 4.61万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Structural Studies on Metallization of Solid Oxygen
固氧金属化的结构研究
  • 批准号:
    08454085
  • 财政年份:
    1996
  • 资助金额:
    $ 4.61万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
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