Magnetic and dielectric properties of InFe $_{2}$ O $_{4}$ , InFeCuO $_{4}$ , and InGaCuO $_{4}$

Yoshii, Kenji ; Ikeda, Naoshi*; Okajima, Yuka; Yoneda, Yasuhiro ; Matsuo, Yoji*; Horibe, Yoichi*; Mori, Shigeo*

The magnetic and dielectric properties of InFe $_{2}$ O $_{4}$ , InFeCuO $_{4}$ and InGaCuO $_{4}$ have been investigated. All these materials areisostructural with RFe $_{2}$ O $_{4}$ (R=Y, Ho-Lu), which shows ferroelectricity due to iron-valence ordering. InFe $_{2}$ O $_{4}$ exhibits similar properties to those of RFe $_{2}$ O $_{4}$ ; the origins of the magnetic and dielectric phenomena are likely common in InFe $_{2}$ O $_{4}$ and RFe $_{2}$ O $_{4}$ . From measurements of the other two materials, we found that both the magnetic transition temperature and the dielectric constant are decreased in the order of InFe $_{2}$ O $_{4}$ , InFeCuO $_{4}$ and InGaCuO $_{4}$ . This result strongly supports the previously reported explanation based on an electron transfer between the Fe-site ions for the corresponding rare-earth systems. Therefore, we propose that the dielectric properties of the oxides isostructural with RFe $_{2}$ O $_{4}$ are plausibly governed by electron transfer; this situation is different from that of ordinary ferroelectrics and dielectrics, in which the displacement factions and anions is important. In addition, InFeCuO $_{4}$ and InGaCuO $_{4}$ exhibit large dielectric constants (larger than about 1500). Inconsideration of this property, the possible applications of these oxides are discussed.

Language	:	English
Journal	:	Inorganic Chemistry
Volume	:	47
Number	:	14
Pages	:	p.6493 - 6501
Publication Year/Month	:	2008/07
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Paper URL	:	https://doi.org/10.1021/ic702365k
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Registration No. : AA20080147
JAEA Abstracts No. : 36001272
Paper Submission No. : 4566

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Magnetic and dielectric properties of InFeO, InFeCuO, and InGaCuO

Magnetic and dielectric properties of InFe $_{2}$ O $_{4}$ , InFeCuO $_{4}$ , and InGaCuO $_{4}$