Structural, Magnetic and Electronic Transport Properties of Novel Hollandite-Type Molybdenum Oxide, Rb_<1.5>Mo_8O_<16>(Cross-disciplinary Physics and Related Areas of Science and Technology)

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概要

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• Structural, magnetic, and transport properties of a novel hollandite-type molybdenum oxide, Rb_<1.5>Mo_8O_<16> have been investigated. Whereas a typical hollandite structure is characterized by uniform zigzag ladder chains of edge-shared MO_6 (M=transition metal) octahedra, the zigzag ladders in Rb_<1.5>Mo_8O_<16> are strongly distorted, and consequently, "Mo_4" clusters composed of four edge-shared MoO_6 octahedra are formed. A semiquantitative band calculation based on an extended Huckel method shows that the band structure assumes the characteristics of the molecular orbitals of an isolated Mo_4 cluster. The magnetic susceptibility reveals the existence of spins spread over each Mo_4 cluster rather than localized on each Mo atom. The electrical resistivity and the thermoelectric power indicate that the electric conduction is governed by cluster-to-cluster electron hopping. Rb_<1.5>Mo_8O_<16> undergoes a phase transtion at T_1=208K, accompanied by a change in the number of spins and carriers. X-ray diffractions at low temperatures detected a slight breakdown of the tetragonal symmetry below T_1. The transport and the magnetic properties of related compounds, K_2Mo_8O_<16> and Ba_<1.14>Mo_8O_<16> are also reported.

• 社団法人日本物理学会の論文
• 2006-01-15

著者

• Sato Hirohiko

  Department Of Physics Chuo University

• Ozawa Takashi

  Department of Applied Biochemistry, College of Agriculture, Osaka Prefecture University

• SUZUKI Isao

  Department of Polymer Science and Engineering, Kyoto Institute of Technology

• Sato Hirohiko

  Department Of Chemistry Faculty Of Science Kyoto University

• Sato Hirohiko

  Department Of Biotechnology Tokyo University Of Agriculture And Technology

• Suzuki Isao

  Department Of Environmental And Symbiotic Sciences Faculty Of Environmental And Symbiotic Sciences P

• Suzuki Isao

  Department Of Physics Chuo University

• Suzuki Isao

  Department Of Earth Sciences Okayama University

• Ozawa Takashi

  Departmant Of Chemistry Faculty Of Engineering Shibaura Institute Of Technology

• SUZUKI Isao

  Department of Physics, Chuo University

• Suzuki Isao

  Department of Chemistry Faculty of Science The University of Tokyo

• OZAWA Takashi

  Department of Physics, Chuo University

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