Structure, dielectric and magnetodielectric properties of Bi1-xGdxFeO3 Ceramics

doi:10.1088/1674-1056/19/10/107505

中国物理B ›› 2010, Vol. 19 ›› Issue (10): 107505-107505.doi: 10.1088/1674-1056/19/10/107505

Structure, dielectric and magnetodielectric properties of Bi_1-xGd_xFeO₃ Ceramics

李静波¹, 饶光辉¹, 骆军¹, 刘广耀¹, 陈景然¹, 梁敬魁², 肖荫果³

(1)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; (2)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China; (3)Institut fuer Festkoerperforschung, Forschungszentrum Juelich, D-52425 Juelich, Germany

收稿日期:2010-04-28 修回日期:2010-06-12 出版日期:2010-10-15 发布日期:2010-10-15
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2007CB925003) and the National Natural Science Foundation of China (Grant No. 50872148).

Structure, dielectric and magnetodielectric properties of Bi_1-xGd_xFeO₃ 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

Received:2010-04-28 Revised:2010-06-12 Online:2010-10-15 Published:2010-10-15
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2007CB925003) and the National Natural Science Foundation of China (Grant No. 50872148).

摘要/Abstract

摘要： Different magnetodielectric effects were observed in Bi_1-xGd_xFeO₃ 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 Bi_1-xGd_xFeO₃ oxides are a good prototype for understanding the magnetodielectric coupling mechanism in this kind of materials.

Abstract: Different magnetodielectric effects were observed in Bi_1-xGd_xFeO₃ 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 Bi_1-xGd_xFeO₃ oxides are a good prototype for understanding the magnetodielectric coupling mechanism in this kind of materials.

Key words: multiferroic, magnetodielectric effect, x-ray diffraction, Bi_1-xGd_xFeO₃ ceramics

中图分类号:

64.70.K-

75.30.Cr (Saturation moments and magnetic susceptibilities) 75.50.Ee (Antiferromagnetics) 75.80.+q (Magnetomechanical effects, magnetostriction) 77.22.Ch (Permittivity (dielectric function)) 77.84.Bw (Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.)

李静波, 饶光辉, 肖荫果, 骆军, 刘广耀, 陈景然, 梁敬魁. Structure, dielectric and magnetodielectric properties of Bi_1-xGd_xFeO₃ Ceramics[J]. 中国物理B, 2010, 19(10): 107505-107505.

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 Bi_1-xGd_xFeO₃ Ceramics[J]. Chin. Phys. B, 2010, 19(10): 107505-107505.

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Structure, dielectric and magnetodielectric properties of Bi_1-xGd_xFeO₃ Ceramics

Structure, dielectric and magnetodielectric properties of Bi_1-xGd_xFeO₃ Ceramics

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