三角格子系鉄複合酸化物LuFe_2O_4における電荷秩序構造と誘電特性 Charge Ordered Structure and Dielectric Properties in LuFe_2O_4

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Recent works revealed that a ferroelectric polarization in the charge-frustrated system LuFe<SUB>2</SUB>O<SUB>4</SUB> originates from an emergence of the charge ordering, which is characterized by a regular arrangement of Fe<SUP>2+</SUP> and Fe<SUP>3+</SUP> ions on the frustrated triangular lattice. In this work, we have investi-gated both the charge ordered (CO) structure and charge ordering processes mainly by means of the transmission electron microscopy (TEM) . Both the CO structure and charge ordering processes depend strongly on the amount of the oxygen deficiency (δ) involved in LuFe<SUB>2</SUB>O<SUB>4-δ</SUB>. In the case of δ-0, the three-dimensional CO structure with the modulation vector of <I>q</I>= [1/3 1/3 1/2] was formed at room temperature. On the other hand, as δ was increased, the three-dimensional CO structure changed into the two-dimensional CO one and the coherent length becomes shorter along the [001] direction. For proper understanding of the dielectric and magnetic properties in LuFe<SUB>2</SUB>O<SUB>4</SUB> and related materials, it should be essential to prepare LuFe<SUB>2</SUB>O<SUB>4-δ</SUB> samples with properly controlled oxygen-concentration and elucidate the physical properties in LuFe<SUB>2</SUB>O<SUB>4-δ</SUB> with δ-0.

収録刊行物

  • 日本結晶学会誌  

    日本結晶学会誌 50(2), 150-154, 2008-04-30 

    The Crystallographic Society of Japan

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各種コード

  • NII論文ID(NAID)
    10021085696
  • NII書誌ID(NCID)
    AN00188364
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03694585
  • NDL 記事登録ID
    9502143
  • NDL 雑誌分類
    ZM46(科学技術--地球科学--岩石・鉱物・鉱床)
  • NDL 請求記号
    Z15-138
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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