Structures and Properties of Semiconductor Microclusters. Production and Properties of B12 Cluster Solids.
スポンサーリンク
概要
- 論文の詳細を見る
The discovery of superconducting transition in C<SUB>60</SUB> solid and Si clathrate solid has largely contributed to the development of the studies of cluster-solids. Both solids are packed with cluster of icosahedral symmetry, C<SUB>60</SUB> soccer-ball and Si<SUB>20</SUB> dodecahedron, respectively. Icosahedral boron solids are packed with B<SUB>12</SUB> icosahedral cluster and the only elemental semiconducting solids of group III element. They have topologically similar crystalline structure to those of C<SUB>60</SUB> solid and Si clathrate solid but form peculiar 3-center covalent bonds which may give peculiar electronic structures and properties to the boron solids. In this article we report the electronic-property investigation on metal-doped β-rhombohedral boron (β-rh. B) solid (most commonly known phase among the icosahedral boron solids) and present the feature of the electronic structure. We have investigated electrical conduction, magnetic susceptibility, nuclear magnetic resonance, electron energy loss spectroscopy, and ultra-violet photo-emission spectroscopy for Li-, Cu-, Ni-, and V-doped β-rh. B. Interestingly metal transition was absent even after several at.% of metal-doping, but we found the density of localized states at the Fermi energy to have a peak with respect to metal concentration. Based on the property, we discuss the possibility of filling localized intrinsic acceptor band originated from the uppermost bonding orbital of B<SUB>12</SUB> icosahedral cluster that is split by the Jahn-Teller distortion. In another form of icosahedral boron solids, however, α-rhombohedral boron was predicted to show metal transition after Li doping by band calculation.
- 公益社団法人 日本表面科学会の論文
公益社団法人 日本表面科学会 | 論文
- An XPS Analysis of the Interfacial Interaction between Oxides and Epoxy Resin.
- A Structure Analysis of Langmuir-Blodgett Magnetic Films by X-ray Diffraction.
- Structure and Reactivity of Surface Compounds Formed on Single Crystal Metal Surfaces During Catalytic Reactions.
- Atomic-Layer Etching of Si by Low Energy Ion Irradiation.
- Microstructure Observations of (Nd, Ce)2CuO4 Superconducting Thin Films by Using Cross-Sectional HRTEM and the Mechanism f Film Growth.