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 $_{4}$ .

Language	:	Japanese
Journal	:	Nihon Kessho Gakkai-Shi
Volume	:	51
Number	:	2
Pages	:	p.162 - 168
Publication Year/Month	:	2009/04
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Paper URL	:	https://doi.org/10.5940/jcrsj.51.162
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Keywords	:	no keyword
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Registration No. : AA20080837
JAEA Abstracts No. : 37000904
Paper Submission No. : 5929

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Ferroelectricity from ordering of Fe valences in the rare-earth iron oxides RFeO(R=Y, Ho-Lu)

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