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Ferroelectricity from ordering of Fe valences in the rare-earth iron oxides RFe$$_{2}$$O$$_{4}$$(R=Y, Ho-Lu)

Yoshii, Kenji ; Ikeda, Naoshi*; Matsuo, Yoji*; Mori, Shigeo*

The rare-earth iron oxides RFe$$_{2}$$O$$_{4}$$ (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 Fe$$^{2+}$$ and Fe$$^{3+}$$ 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 RFe$$_{2}$$O$$_{4}$$ oxides, LuFe$$_{2}$$O$$_{4}$$.

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