The Effect of Lithium Intercalation on the Crystal Structure and Magnetic Property of Layered FeWO4Cl

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概要

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• LiFeWO4Cl has been prepared by reductive intercalation of lithium into FeWO4Cl. FeWO4Cl crystallizes into a tetragonal system (space group P4/nmm) with cell dimensions of a=6.677(5) Å and c=5.270(5) Å, while lithium intercalation gives rise to the formation of a monoclinic phase ( P21/m) with cell dimensions of a=7.050(0) Å, b=6.926(2) Å, c=5.043(0) Å and β=92.54(2)°. Infrared (IR) spectroscopic analyses of FeWO4Cl and LiFeWO4Cl show that the symmetry of the tetrahedral WO42- group in FeWO4Cl becomes reduced as the lithium intercalate into its two-dimensional lattice, indicating an alternately ordered lithium occupancy of half of the octahedral interlayer sites. The effective magnetic moments of FeWO4Cl and LiFeWO4Cl were estimated to be 5.95 and 5.10 B.M., respectively, which can be attributed to the selective reduction of a high-spin ferric ion to a high-spin ferrous one upon lithium intercalation. It was also found that the two-dimensional magnetic property of FeWO4Cl was changed to a three-dimensional one in LiFeWO4Cl owing to the c-axis contraction.

• INSTITUTE OF PURE AND APPLIED PHYSICSの論文
• 1997-05-15

著者

• Han Kyoo-seung

  Department Of Chemistry Seoul National University

• Choy Jin-ho

  Department Of Chemistry Center For Molecular Catalysis Seoul National University

• Park Nam-gyu

  Department Of Chemistry Seoul National University

• Yoon Joo-byoung

  Department Of Chemistry Center For Molecular Catalysis Seoul National University

• CHANG Soon-Ho

  Electronics and Telecommunications Research Institute

• Chang Soon-Ho

  Electronics and Telecommunications Research Institute, Taejon 305-600, Korea

• Yoon Joo-Byoung

  Department of Chemistry, Seoul National University, Seoul 151-742, Korea

• Han Kyoo-Seung

  Department of Chemistry, Seoul National University, Seoul 151-742, Korea

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