希土類‐鉄酸化物RFe2O4の示す新規な強誘電性(R=Y,Ho‐Lu)

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タイトル別名
  • Ferroelectricity from Ordering of Fe Valences in the Rare-Earth Iron Oxides RFe2O4 (R=Y, Ho-Lu)
  • 希土類-鉄酸化物RFe2O4の示す新規な強誘電性(R=Y,Ho-Lu)
  • キドルイ テツ サンカブツ RFe2O4 ノ シメス シンキ ナ キョウ ユウデンセイ R Y Ho Lu

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The rare-earth iron oxides RFe2O4 (R = Y, Ho-Lu) have a rhombohedral crystal structure, consisting of an alternating stacking of triangular lattices of R, Fe and O ions. Recently, we have proposed that this system shows a new mechanism of ferroelectricity ; the ferroelectric state originates from a polar charge-ordered structure of Fe2+ and Fe3+ on a triangular lattice. In this article, a review is given on the details of this ferroelectricity, which were revealed by measurements of synchrotron X-ray diffraction and dielectric properties of one of the RFe2O4 oxides, LuFe2O4.

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