A unified picture for icosahedral cluster solids in boron-based and aluminum-based compounds
A unified picture for icosahedral cluster solids in boron-based and aluminum-based compounds
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DOI：
10.1006/jssc.1997.7491
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发表时间：
1997-10-01
影响因子：
3.3
通讯作者：
Werheit, H
中科院分区：
文献类型：
--
作者：
Kimura, K;Takeda, M;Werheit, H
本文讨论了由二十面体团簇构成的硼基和铝基化合物的统一情况。十二原子无中心二十面体Al-12和B-12具有共价键性质，而十三原子为中心的Al-13和B-13是金属性质。这两种化合物的稳定机制，即Hume-Rothery机制和Jahn-Teller效应密切相关。硼化合物在多壳结构的第二壳层中有最近的位置。当这些位置被掺杂金属原子占据时，硼化合物的团簇结构、直流电导率和光学电导率接近于铝化合物。在铝化合物和硼化合物中都观察到光传导，通过赝隙局域态和本征受体水平的载流子激发产生的光电流分别对铝和硼化合物很重要。(C) 1997学术出版社。
Discussions are presented to get a unified picture for the boron-based and aluminum-based compounds constructed from icosahedral clusters, Twelve-atom centerless icosahedra, Al-12 and B-12, have a covalent bonding nature, though 13-atom centered ones, Al-13 and B-13, are metallic, Stabilization mechanisms for the both compounds, the Hume-Rothery mechanism and the Jahn-Teller effect, are closely related, There are recant sites in the second shell of the multi-shell structure for boron compounds, When these sites are occupied by dopant metal atoms, the cluster structure, dc conductivity, and optical conductivity of the boron compounds approach those of the aluminum compounds, Photo-conduction is observed in aluminum compounds as roell as in boron compounds, Photocurrent arising from carrier excitation through the localized states in the pseudogap and the intrinsic acceptor levels are important for aluminum and boron compounds, respectively. (C) 1997 Academic Press.