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Tunable dielectric properties in Mn-doped LuFe2O4 system

Published online by Cambridge University Press:  20 January 2012

Ying Hou ,
Yiping Yao ,
Sining Dong ,
Xi Huang ,
Xuefeng Sun  and
Xiaoguang Li
Ying Hou
Affiliation:
Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China; and International Center for Materials Physics, Academia Sinica, Shenyang 110015, People’s Republic of China; and Department of Physics, East China University of Science and Technology, Shanghai 200237, China
Yiping Yao
Affiliation:
Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026; and International Center for Materials Physics, Academia Sinica, Shenyang 110015, People’s Republic of China
Sining Dong
Affiliation:
Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026; and International Center for Materials Physics, Academia Sinica, Shenyang 110015, People’s Republic of China
Xi Huang
Affiliation:
Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026; and International Center for Materials Physics, Academia Sinica, Shenyang 110015, People’s Republic of China
Xuefeng Sun
Affiliation:
Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026; and International Center for Materials Physics, Academia Sinica, Shenyang 110015, People’s Republic of China
Xiaoguang Li*
Affiliation:
Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026; and International Center for Materials Physics, Academia Sinica, Shenyang 110015, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: lixg@ustc.edu.cn
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Abstract

The dielectric properties and tunability with external magnetic and electric fields for LuFe2-xMnxO4 (0 ≤ x ≤ 1) are systematically studied. It was found that the dielectric loss, the ferrimagnetic Curie temperature, and the conductivity reduce with increasing Mn doping. One of the most important results is that the room temperature dielectric tunability with low magnetic and electric fields can be achieved in these samples. The analysis demonstrates that the electron transfer between Fe2+ and Fe3+ is efficiently suppressed with Mn doping and thus results in the decreases of the leaky conductivity and the dielectric loss. Furthermore, from the studies on the combination of impedance and modulus complex planes for the samples with different electrodes, the tunability is found to be more closely related to the extrinsic effect than the intrinsic bulk effect.

Keywords

dielectric properties
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 6 , 28 March 2012 , pp. 922 - 927
Copyright
Copyright © Materials Research Society 2012

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