解説
希土類－鉄酸化物RFe2O4の示す新規な強誘電性（R＝Y, Ho-Lu）
2009 年 51 巻 2 号 p. 162-168
詳細
2009 年 51 巻 2 号 p. 162-168
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.
