Structure, dielectric and magnetodielectric properties of Bi1-xGdxFeO3 Ceramics

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

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.

Keywords: multiferroic magnetodielectric effect x-ray diffraction Bi_1-xGd_xFeO₃ ceramics

Received: 28 April 2010
Revised: 12 June 2010
Accepted manuscript online:

PACS:	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.)

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).

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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 2010 Chin. Phys. B 19 107505

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Structure, dielectric and magnetodielectric properties of Bi1-xGdxFeO3 Ceramics

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Structure, dielectric and magnetodielectric properties of Bi_1-xGd_xFeO₃ Ceramics