A unified picture for icosahedral cluster solids in boron-based and aluminum-based compounds

被引：40

作者：

Kimura, K ^{[1
]}

Takeda, M ^{[1
]}

Fujimori, M ^{[1
]}

Tamura, R ^{[1
]}

Matsuda, H ^{[1
]}

Schmechel, R ^{[1
]}

Werheit, H ^{[1
]}

机构：

[1] UNIV DUISBURG,SOLID STATE PHYS LAB,D-47048 DUISBURG,GERMANY

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1997年 / 133卷 / 01期

关键词：

D O I：

10.1006/jssc.1997.7491

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

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.

引用

页码：302 / 309

页数：8

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