X-ray Absorption Fine Structure Study of La_<0.5>Sr_<0.5>Co_<1-y>Fe_yO_3 Cobaltites(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• The local structure and electron configuration of Co and Fe ions in La_<0.5>Sr_<0.5>Co_<1-y>Fe_yO_3 (y=0.3 and 0.6) cobaltites have been examined by the X-ray absorption fine structure (XAFS) study. It was observed that the average valence of cobalt ions changed while the valence of iron ions did not. The average Fe-O bonding distance in (Fe/Co)O_6 octahedra was higher than that of Co-O pairs. Based on the relationship between the Debye-Waller factor and bond strength, it was concluded that the strength of Co-O bond is stronger than that of Fe-O bond in the y=0.6 sample and weaker in the y=0.3 compound. The change of the Co-ion valence and the local structure of the perovskite cell with y are discussed in connection with the change of magnetic and transport properties of the cobaltites.

• 社団法人日本物理学会の論文
• 2005-08-15

著者

• Yang Dong

  Physics Division School Of Science Education Chungbuk National University

• Yu Seong

  Department Of Physics Chungbuk National University

• KIM Ikgyun

  Physics Division, School of Science Education, Chungbuk National University

• ULYANOV Alexander

  Department of Physics, Chungbuk National University

• PHAN The

  Department of Physics, Chungbuk National University

• Kim Ikgyun

  Physics Division School Of Science Education Chungbuk National University

• Phan The

  Department Of Physics Chungbuk National University

• Ulyanov Alexander

  Department Of Physics Chungbuk National University

関連論文

• Structural Analysis and Magnetic Properties of Mechanically Alloyed Fe_Ni_(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
• X-ray Absorption Fine Structure Study of La_Sr_Co_Fe_yO_3 Cobaltites(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
• EXAFS Study for Mechanically Alloyed Co_C_
• EXAFS Study for Mechanical Alloyed Fe_C_ : Condensed Matter: Structure, etc.
• X-ray Absorption Fine Structure Study of La_Sr_Co_Fe_yO_3 Cobaltites(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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