スピネル化合物AlV_2O_4における電荷秩序構造と不純物置換効果 Charge Ordered Structure and its Impurity Doping Effect in Spinel AlV_2O_4

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The charge ordered (CO) state in spinel A1V<SUB>2</SUB>O<SUB>4</SUB>, which appears below 700 K, was examined by electron and synchrotron x-ray diffraction experiments. It was found that the CO structure is characterized by the formation of V clusters (heptamers), each of which is consisting of 7 vanadium atoms and is in a spin-singlet state as a total. In addition, it was revealed that the Cr substitution for V in A1V<SUB>2</SUB>O<SUB>4</SUB> suppressed the formation of the long-ranged CO structure and induced the charge disordered (CD) state. As a result, the coexisting state between the CO and CD states with the 20-30 nm size was stabilized in A1V<SUB>2-x</SUB>Cr<SUB>x</SUB>O<SUB>4</SUB> with x=0.125.

収録刊行物

  • 日本結晶学会誌

    日本結晶学会誌 48(6), 424-428, 2006-12-25

    The Crystallographic Society of Japan

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各種コード

  • NII論文ID(NAID)
    10018467436
  • 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
    8629972
  • 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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