金属・非金属境界に位置する金混合原子価錯体の電子状態の研究とその超伝導相の探索
位于金属/非金属边界的金混合价配合物的电子态研究及其超导相的寻找
基本信息
- 批准号:05452040
- 负责人:
- 金额:$ 4.29万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (B)
- 财政年份:1993
- 资助国家:日本
- 起止时间:1993 至 1994
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The crystal structure and electronic properties of Au mixed valence compounds M_2Au_2X_6 (M=Rb, Cs ; X=Cl, Br, I) have been investigated by means of X-ray diffraction measurement under high pressure, ^<197>Au and ^<129>I Mossbauer spectroscopic measurements, and single crystal polarized reflectivity measurement. The results are as follows : (1) Cs_2Au_2X_6 (X=Cl, Br, I) undergo a tetragonal (I) -to-tetragonal (II) transition driven by the Au^I*Au^<III> transition at 11,9, and 5.5 GPa, respectively. Above the critical pressure, the AuI_6 octahedra in Cs_2Au_2I_6 are elongated, contrary the AuX_6 ones in Cs_2Au_2X_6 (X=Cl and Br) are compressed. Reflecting the half-filled HOMO band, it is considered that Cs_2Au_2X_6 (X=Cl and Br) and Cs_2Au_2I_6 in the tetragonal (II) phase behave as one-dimensional and two-dimensional conductors, respectively. The cubic perovskite phase with Au^<II> valence state appears under high pressures and high temperatures for all three compounds, which could be obtained as a metastable state at room temperature and ambient pressure. (2) Three inter-valence charge transfer transition (IVCT) bands appear in the visible region for all the compounds M_2Au_2X_6. From the analysis of IVCT,the inter-valence charge transfer interaction between Au^I and Au^<III> is considered to be two-dimensional. (3) From the analysis of Au and I Mossbauer spectra, the nature of the chemical bond between Au and halogen has been investigated in detail.
本文用高压X射线衍射、^ Au和^ I穆斯堡尔谱学以及单晶偏振反射率测量方法研究了Au混合价化合物M_2Au_2X_6(M=Rb,Cs ; X=Cl,Br,I)的晶体结构和电子性质<197><129>。结果表明:(1)Cs_2Au_2X_6(X=Cl,Br,I)分别在11,9和5.5GPa下发生了由Au^I*Au^跃迁驱动的四氢(I)→四氢(II)跃迁<III>。在临界压力以上,Cs_2Au_2I_6中AuI_6八面体被拉长,而Cs_2Au_2X_6(X=Cl和Br)中AuX_6八面体被压缩。根据半满HOMO能带,我们认为Cs_2Au_2X_6(X=Cl和Br)和Cs_2Au_2I_6在四氢化物(II)相中分别表现为一维和二维导体。三<II>种化合物在高温高压条件下均呈现出Au 2价态的立方钙钛矿相,在室温和常压条件下均为亚稳态。(2)所有化合物M_2Au_2X_6在可见光区均出现三个价间电荷转移跃迁带。由IVCT分析可知,Au^I和Au^I之间的价间电荷转移相互作用<III>是二维的。(3)通过对Au和I穆斯堡尔谱的分析,详细研究了Au与卤素之间的化学键的性质。
项目成果
期刊论文数量(34)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
N.Kojima: "Optical Investigation of the Intervalence Charge-Transfer Interaction in the Three-Dimensional Au Mixed-Valeuce Compounds Cs_2Au_2X_6(X=Cl,Br,I)." J.Chem.Soc.Dalton Trans.327-331 (1994)
N.Kojima:“三维金混价化合物 Cs_2Au_2X_6(X=Cl,Br,I) 中价间电荷转移相互作用的光学研究”。
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- 影响因子:0
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- 通讯作者:
N.Kojima: "^<197>Au Mossbauer Spectroscopic Study on the Three-Dimensional Halogen Bridged Mixed Valence Complexes M_2Au_2X_6(M=Rb,Csi X=Br,I)" Nuclear Instruments and Methods in Physics Research. B76. 366-367 (1993)
N.Kojima:“^<197>三维卤素桥混合价配合物M_2Au_2X_6(M=Rb,Csi X=Br,I)的金穆斯堡尔光谱研究”物理研究中的核仪器和方法。
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- 影响因子:0
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N.Kojima et al.: "Optical Investigation of the Intervalence Charge-Transfer Interaction in the three-Dimensional Au Mixed-Valence Compounds Cs_2Au_2X_6 (X=Cl, Br, I)" J.Chem.Soc.Dalton Trans.327-331 (1994)
N.Kojima 等人:“三维 Au 混合价化合物 Cs_2Au_2X_6 (X=Cl、Br、I) 中价间电荷转移相互作用的光学研究”J.Chem.Soc.Dalton Trans.327-331
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T.Terashima: "Electrical Transport Properties of Incommensurate Layer Compounds (RES)_xNbS_2(RE=Rare-Earth Metals;x=1.2,0・6)" J.Phys.Soc.Jpn.63. 658-673 (1994)
T.Terashima:“不相称层状化合物(RES)_xNbS_2(RE=稀土金属;x=1.2,0・6)的电传输特性”J.Phys.Soc.Jpn.63(1994)。
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H.Sato: "Structural Phase Transitions of the Quasi Two-Dimensional Metal (K_<1-X>Rb_X)_3Cu_8S_6:X-ray Scattering Studies." J.Phys.Soc.Jpn.62. 2051-2061 (1993)
H.Sato:“准二维金属 (K_<1-X>Rb_X)_3Cu_8S_6 的结构相变:X 射线散射研究。”
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KOJIMA Norimichi其他文献
KOJIMA Norimichi的其他文献
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{{ truncateString('KOJIMA Norimichi', 18)}}的其他基金
Development of New Molecular Magnetism Based on Dynamical Spin Equilibrium
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Development of pH-Sensitive Spin-Crossover Complex Film and Direct Observation of Proton Flow
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24655115 - 财政年份:2012
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Grant-in-Aid for Challenging Exploratory Research
Progress of Organic-Inorganic Hybrid Complexes Having NovelSuccessive Physical Properties Coupled with Photon-Spin-Charge
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22350057 - 财政年份:2010
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Dynamical Spin Crossover Phenomenon in Organic-Inorganic Composite Complex and Its Development to Molecular System
有机-无机复合物中的动态自旋交叉现象及其向分子体系的发展
- 批准号:
18350069 - 财政年份:2006
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Progress of Conjugated Phenomena Coupled with Spin and Photon for Assembled Hetero-Molecular System by Using Coordination Space
利用配位空间组装异质分子体系自旋与光子耦合共轭现象研究进展
- 批准号:
16074205 - 财政年份:2004
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Grant-in-Aid for Scientific Research on Priority Areas
Study on the dynamical spin-crossover phenomenon coupled with spinm and charge, and its multifunctionalities
自旋与电荷耦合的动态自旋交叉现象及其多功能性研究
- 批准号:
15350078 - 财政年份:2003
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$ 4.29万 - 项目类别:
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Research on Multifunctional Properties Coupled with Photon and Spin for Transition-Metal Complexes
过渡金属配合物光子与自旋耦合多功能性质研究
- 批准号:
10440203 - 财政年份:1998
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$ 4.29万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Design and Development of the Transition Metal Complexes Having Multi Functional Properties.
具有多功能特性的过渡金属配合物的设计和开发。
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07304046 - 财政年份:1995
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$ 4.29万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
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