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Low temperature and High-pressure Raman Study of Superconductivity and Cage-structure Stability of Silicon Clathrates

Low temperature and High-pressure Raman Study of Superconductivity and Cage-structure Stability of Silicon Clathrates
硅包合物超导性和笼形结构稳定性的低温高压拉曼研究
批准号:
15340095
负责人:
SHIMIZU Hiroyasu
金额:
$6.66万
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:
2003
资助国家:
日本
项目状态:
已结题
起止时间:
2003 至 2004

项目摘要

项目成果

SHIMIZU Hiroyasu的其他基金

相关文献

中文摘要
翻译
硅笼状晶体是一种共价键合笼状晶体,由共面共面的Si_(20)、Si_(24)和Si_(28)多面体组成,其中占据客体原子。这些化合物作为新的超导体、特殊的宽禁带半导体和一类新的热电材料继续吸引着人们的注意。用高压拉曼光谱研究了主客体晶格的振动性质以及客体-主客体的相互作用,测量了I类硅笼合物Ba8Si;46>、K_8Si_<46>和I_8Si_<44>I_2和III型Ba_<24>Si_<100>的高压拉曼散射高达30 Gpa。在40-110 cm~(-1)~(-1)~gt~(-1)附近,在两种或三种笼子中发现了与Ba、K、I原子有关的低频振动模。在110-450 cm^<-1>附近还观察到了硅骨架拉曼光谱。压力诱导相变发生在高压下。它们与客体原子的运动和客体与宿主的相互作用密切相关。在高压下发现了非晶硅的非晶化不可逆转变,并通过比较高压下的非晶硅进行了讨论。结合这些结果和硅笼状结构的高压相变,我们研究了它们与客体和笼状结构的关系以及笼状结构的稳定性。
英文摘要
Silicon clathrates are covalent bonded cage-like crystals composed of face-sharing Si_<20>, Si_<24>, and Si_<28> polyhedra in which guest atoms are occupied. These compounds continue to attract much attention as new superconductors, unusual wide-bandgap semiconductor, and a new class of thermo-electric materials. Vibrational properties of guests and host lattice, and the guest-host interactions are studied by high-pressure Raman spectroscopy.High-pressure Raman scattering of type-I silicon clathrates, Ba_8Si_<46>, K_8Si_<46>, and I_8Si_<44>I_2, and type-III Ba_<24>Si_<100> were measured up to about 30 GPa. Low-frequency vibrational modes associated with Ba, K, and I atoms isnside two or three kinds of cages were found around 40-110 cm^<-1>. The silicon framework Raman bands were also observed around 110-450 cm^<-1>. Pressure-induced phase transitions occurred at high pressures. They are closely related to the motions of guest atoms and the guest-host interactions. At higher pressures, the pressure-induced amorphized irreversible transitions were found, which were discussed by comparing the amorphous silicon at high pressures.By considering these results and high-pressure phase transitions of Si clathrates, we investigate their characteristics depending on guests and cage-structures, and the stability of cage-structures.
期刊论文(36)
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High-pressure Raman study of Ba deped type III silicon clathrate Ba24Si100 up to 27 GPa
Ba 依赖的 III 型硅包合物 Ba24Si100 高达 27 GPa 的高压拉曼研究
DOI: --
发表时间: 2005
期刊: Phys.Rev.B 71(in press)
影响因子: --
作者: [Y.Mitsumori, A.Oiwa, T.Slupinsi, H.Maruki, Y.Kashimua, F.Minami, H.Munekata, H.Shimizu et al.]
通讯作者: H.Shimizu et al.
ラマン分光によるシリコンクラスレートのゲストおよびホストの振動と高圧相転移の研究
通过拉曼光谱研究硅包合物中的客体和主体振动和高压相变
DOI: --
发表时间: 2005
期刊: 日本物理学会誌 60(7月号)
影响因子: --
作者: [Machida, Masahiro N., 清水宏晏ら]
通讯作者: 清水宏晏ら
High-pressure Raman study of Ba doped type III silicon clathrate Ba_<24>Si_<100> up to 27 GPa
Ba 掺杂 III 型硅包合物 Ba_<24>Si_<100> 高达 27 GPa 的高压拉曼研究
DOI: --
发表时间: 2005
期刊: Phys.Rev.B 71 (No.9)
影响因子: --
作者: [Machida, Masahiro N., 清水宏晏ら, 武田 淳, H.Shimizu et al.]
通讯作者: H.Shimizu et al.
DOI: 10.1103/physrevlett.90.155503
发表时间: 2003-04-18
期刊: PHYSICAL REVIEW LETTERS
影响因子: 8.6
作者: [Kume, T, Fukuoka, H, Yamanaka, S]
通讯作者: Yamanaka, S
共 14 条
    Assessment of the combined effect of chemicals on the ion channels of freshwater fish.
    • 批准号:
      23790677
    • 项目类别:
      Grant-in-Aid for Young Scientists (B)
    • 资助金额:
      $0.33万
    • 财政年份:
      2011
    • 负责人:
      SHIMIZU Hiroyasu
    • 依托单位:
    Guest-Host Interaction and High-pressure Phase Transitions in Semiconductor Clathrates Studied by Raman Spectromopy
    • 批准号:
      18540315
    • 项目类别:
      Grant-in-Aid for Scientific Research (C)
    • 资助金额:
      $2.43万
    • 财政年份:
      2006
    • 负责人:
      SHIMIZU Hiroyasu
    • 依托单位:
    Elastic Properties of single Crystalline Methane and carbon Bioxide Hydrates
    • 批准号:
      13440092
    • 项目类别:
      Grant-in-Aid for Scientific Research (B)
    • 资助金额:
      $2.75万
    • 财政年份:
      2001
    • 负责人:
      SHIMIZU Hiroyasu
    • 依托单位:
    Synthesis of high-pressure van der Waals compounds and its elastic properties
    • 批准号:
      11640313
    • 项目类别:
      Grant-in-Aid for Scientific Research (C)
    • 资助金额:
      $2.11万
    • 财政年份:
      1999
    • 负责人:
      SHIMIZU Hiroyasu
    • 依托单位: