Structural, Magnetic and Electronic Transport Properties of Novel Hollandite-Type Molybdenum Oxide, Rb_1.5Mo₈O₁₆

• Ozawa Takashi

  Department of Physics, Chuo University

• Suzuki Isao

  Department of Physics, Chuo University

• Sato Hirohiko

  Department of Physics, Chuo University

書誌事項

タイトル別名

• Structural, Magnetic and Electronic Transport Properties of Novel Hollandite-Type Molybdenum Oxide, Rb1.5Mo8O16

抄録

Structural, magnetic, and transport properties of a novel hollandite-type molybdenum oxide, Rb_1.5Mo₈O₁₆ have been investigated. Whereas a typical hollandite structure is characterized by uniform zigzag ladder chains of edge-shared MO₆ (M=transition metal) octahedra, the zigzag ladders in Rb_1.5Mo₈O₁₆ are strongly distorted, and consequently, “Mo₄” clusters composed of four edge-shared MoO₆ octahedra are formed. A semiquantitative band calculation based on an extended Hückel method shows that the band structure assumes the characteristics of the molecular orbitals of an isolated Mo₄ cluster. The magnetic susceptibility reveals the existence of spins spread over each Mo₄ 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_1.5Mo₈O₁₆ undergoes a phase transtion at T₁=208 K, 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 T₁. The transport and the magnetic properties of related compounds, K₂Mo₈O₁₆ and Ba_1.14Mo₈O₁₆ are also reported.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 75 (1), 014802-, 2006

  一般社団法人 日本物理学会

キーワード

• transition metal oxide
• phase transition
• molybdenum
• band structure
• crystal structure
• low dimension
• magnetism
• electric conduction
• thermoelectric power

詳細情報

• CRID: 1390001204189895424
• NII論文ID: 110003482845
• NII論文ID: 210000105971
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.75.014802
• BIBCODE: 2006JPSJ...75a4802O
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 7772331
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7772331
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.014802
• 本文言語コード: en
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