Abstract
The magnetic and dielectric properties of InFe2O4, InFeCuO4, and InGaCuO4 have been investigated. All these materials are isostructural with RFe2O4 (R = Y, Ho-Lu), which shows ferroelectricity due to iron-valence ordering. InFe 2O4 exhibits ferrimagnetic ordering at Tc ∼ 242 K and a dielectric constant (ε) of ∼10000 at around room temperature. These properties resemble those of RFe2O4; the origins of the magnetic and dielectric phenomena are likely common in InFe2O4 and RFe2O4. From measurements of the other two materials, we found that both Tc and ε are decreased in the order of InFe2O4, InFeCuO 4, and InGaCuO4. 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 AFe 2O4 are plausibly governed by electron transfer; this situation is different from that of ordinary ferroelectrics and dielectrics, in which the displacement of cations and anions is important. In addition, InFeCuO4 and InGaCuO4 exhibit large ε values (δ > ∼1500). In consideration of this property, we discuss the possible applications of these oxides.
| Original language | English |
|---|---|
| Pages (from-to) | 6493-6501 |
| Number of pages | 9 |
| Journal | Inorganic Chemistry |
| Volume | 47 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - Jul 21 2008 |
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- Inorganic Chemistry
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Magnetic and dielectric properties of InFe2O4, InFeCuO4, and InGaCuO4 . / Yoshii, Kenji; Ikeda, Naoshi; Okajima, Yuka; Yoneda, Yasuhiro; Matsuo, Yoji; Horibe, Yoichi; Mori, Shigeo.
In: Inorganic Chemistry, Vol. 47, No. 14, 21.07.2008, p. 6493-6501.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Magnetic and dielectric properties of InFe2O4, InFeCuO4, and InGaCuO4
AU - Yoshii, Kenji
AU - Ikeda, Naoshi
AU - Okajima, Yuka
AU - Yoneda, Yasuhiro
AU - Matsuo, Yoji
AU - Horibe, Yoichi
AU - Mori, Shigeo
PY - 2008/7/21
Y1 - 2008/7/21
N2 - The magnetic and dielectric properties of InFe2O4, InFeCuO4, and InGaCuO4 have been investigated. All these materials are isostructural with RFe2O4 (R = Y, Ho-Lu), which shows ferroelectricity due to iron-valence ordering. InFe 2O4 exhibits ferrimagnetic ordering at Tc ∼ 242 K and a dielectric constant (ε) of ∼10000 at around room temperature. These properties resemble those of RFe2O4; the origins of the magnetic and dielectric phenomena are likely common in InFe2O4 and RFe2O4. From measurements of the other two materials, we found that both Tc and ε are decreased in the order of InFe2O4, InFeCuO 4, and InGaCuO4. 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 AFe 2O4 are plausibly governed by electron transfer; this situation is different from that of ordinary ferroelectrics and dielectrics, in which the displacement of cations and anions is important. In addition, InFeCuO4 and InGaCuO4 exhibit large ε values (δ > ∼1500). In consideration of this property, we discuss the possible applications of these oxides.
AB - The magnetic and dielectric properties of InFe2O4, InFeCuO4, and InGaCuO4 have been investigated. All these materials are isostructural with RFe2O4 (R = Y, Ho-Lu), which shows ferroelectricity due to iron-valence ordering. InFe 2O4 exhibits ferrimagnetic ordering at Tc ∼ 242 K and a dielectric constant (ε) of ∼10000 at around room temperature. These properties resemble those of RFe2O4; the origins of the magnetic and dielectric phenomena are likely common in InFe2O4 and RFe2O4. From measurements of the other two materials, we found that both Tc and ε are decreased in the order of InFe2O4, InFeCuO 4, and InGaCuO4. 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 AFe 2O4 are plausibly governed by electron transfer; this situation is different from that of ordinary ferroelectrics and dielectrics, in which the displacement of cations and anions is important. In addition, InFeCuO4 and InGaCuO4 exhibit large ε values (δ > ∼1500). In consideration of this property, we discuss the possible applications of these oxides.
UR - http://www.scopus.com/inward/record.url?scp=48749112494&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=48749112494&partnerID=8YFLogxK
U2 - 10.1021/ic702365k
DO - 10.1021/ic702365k
M3 - Article
C2 - 18564837
AN - SCOPUS:48749112494
VL - 47
SP - 6493
EP - 6501
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 14
ER -