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Multiferroic properties of Bi1−xDyxFeO3 nanoparticles

J. Appl. Phys. 106, 084312 (2009); doi:10.1063/1.3245390

Published 22 October 2009

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F. Z. Qian,1 J. S. Jiang,1 S. Z. Guo,1 D. M. Jiang,1 and W. G. Zhang2
1Department of Physics, Center of Functional Nanomaterials and Devices, East China Normal University, Shanghai 200062, People's Republic of China
2State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, People's Republic of China
Dysprosium (Dy)-doped BiFeO3 (BFO) (BFDO) nanoparticles were prepared by an ethylene glycol based sol-gel method. Partial substitution of Dy (0%–20%) at the Bi site results in a change from the rhombohedral structure (x=0) to the orthorhombic structure (x=0.10,0.20) of BFO nanoparticles. The average grain size varies from 65 to 24 nm when Dy concentration increases from x=0 to x=0.20. Saturated magnetization Ms of BDFO increases with increasing Dy concentration and decreasing grain size. Moreover, dielectric properties were measured up to high frequency ~95  MHz, and Dy dopant was found to be helpful to improve dielectric ordering and reduce loss. Surprisingly, the large magnetodielectric coefficient was found to be 4.7% in the as-prepared BFO nanoparticles, and −6.3% in Bi0.8Dy0.2FeO3 at H=100  Oe and f=75  MHz. ©2009 American Institute of Physics
History: Received 24 April 2009; accepted 20 September 2009; published 22 October 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/084312/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.80.+q
    Magnetomechanical and magnetoelectric effects, magnetostriction
  • 77.80.-e
    Ferroelectricity and antiferroelectricity
  • 77.22.Gm
    Dielectric loss and relaxation
  • 81.20.Fw
    Sol-gel processing, precipitation
  • 75.60.Ej
    Magnetization curves, hysteresis, Barkhausen and related effects
  • 61.72.sh
    Impurity distribution in crystals
  • YEAR: 2009

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ISSN:
0021-8979 (print)   1089-7550 (online)
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