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Report No.

Valence control of charge and orbital frustrated system YbFe$$_{2}$$O$$_{4}$$ with electrochemical Li$$^{+}$$ intercalation

Murase, Satoshi*; Yoshikawa, Yumi*; Fukada, Yukimasa*; Ikeda, Naoshi*; Teranishi, Takashi*; Kano, Jun*; Fujii, Tatsuo*; Tsuji, Takuya  ; Yoshii, Kenji  

We have investigated the electrochemical intercalation of Li$$^{+}$$ ions in electronic ferroelectric YbFe$$_{2}$$O$$_{4}$$, in which the ferroelectriciry is owing to the charge ordering of equimolar Fe$$^{2+}$$ and Fe$$^{3+}$$ on a triangular lattice. The main aim of this study is to control the ratio of Fe$$^{2+}$$/Fe$$^{2+}$$ ratio because the ratio should effect the interaction of iron ions and the appearance of a possible new electronic phase. X-ray absorption measurements at Fe K-edge showed that Fe$$^{3+}$$ is reduced completely to Fe$$^{2+}$$ by the Li$$^{+}$$ intercalation of about 100 mAh/g. With the increase of Li$$^{+}$$ amount, the X-ray diffraction showed the lattice expansion by the coulomb repulsion of Li$$^{+}$$. We also report the variation of fundamental properties such as magnetic, dielectric and electric conduction in accordance with the ratio control of Fe$$^{3}$$+ and Fe$$^{2+}$$.



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