CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Structure, dielectric and magnetodielectric properties of Bi1-xGdxFeO3 Ceramics |
Li Jing-Bo(李静波)a)†, Rao Guang-Hui(饶光辉)a), Xiao Yin-Guo(肖荫果)b), Luo Jun(骆军) a), Liu Guang-Yao(刘广耀)a), Chen Jing-Ran(陈景然) a), and Jing-Kui Liang(梁敬魁)a)c) |
a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; b Institut fuer Festkoerperforschung, Forschungszentrum Juelich, D-52425 Juelich, Germany; c International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract Different magnetodielectric effects were observed in Bi1-xGdxFeO3 ceramics depending on gadolinium content. A positive one was observed in the samples with x ≤ 0.10 at 295 K and 16 K, and a negative one in the sample with x = 0.4 at 16 K. Structure analysis by x-ray diffraction (XRD) reveals that the samples crystallize in the R3c structure (ferroelectrics) for x < 0.08 and in the Pbnm structure (paraelectrics) for x ≥ 0.3 at room temperature. Temperature-dependent dielectric response and x-ray diffraction confirm the occurrence of a structural transition in the Pbnm phase at low temperature for the samples with x ≤ 0.4. While the positive magnetodielectric effects can be attributed to a coupling of magnetic and crystallographic structures of the R3c phase, the observed negative magnetodielectric effect in the Pbnm phase can be associated with a low-temperature modification of the Pbnm structure. The observed dual-signed magnetodielectric effects suggest that the Bi1-xGdxFeO3 oxides are a good prototype for understanding the magnetodielectric coupling mechanism in this kind of materials.
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Received: 28 April 2010
Revised: 12 June 2010
Accepted manuscript online:
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PACS:
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64.70.K-
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75.30.Cr
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(Saturation moments and magnetic susceptibilities)
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75.50.Ee
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(Antiferromagnetics)
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75.80.+q
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(Magnetomechanical effects, magnetostriction)
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77.22.Ch
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(Permittivity (dielectric function))
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77.84.Bw
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(Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.)
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Fund: Project supported by the National Basic Research Program of China (Grant No. 2007CB925003) and the National Natural Science Foundation of China (Grant No. 50872148). |
Cite this article:
Li Jing-Bo(李静波), Rao Guang-Hui(饶光辉), Xiao Yin-Guo(肖荫果), Luo Jun(骆军) Liu Guang-Yao(刘广耀), Chen Jing-Ran(陈景然), and Jing-Kui Liang(梁敬魁) Structure, dielectric and magnetodielectric properties of Bi1-xGdxFeO3 Ceramics 2010 Chin. Phys. B 19 107505
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