Effect of dysprosium substitution on crystal structure and physical properties of multiferroic BiFeO3 ceramics

The polycrystalline samples of multiferroic Bi1−xDyxFeO3 (x=0, 0.1, and 0.2) were prepared by a modified solid state reaction method and characterized by X-ray diffraction, scanning electron microscopy, differential thermal analysis, dielectric and magnetic measurements. It was shown that the introd...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2014-03, Vol.34 (3), p.641-651
Main Authors: Koval, V., Skorvanek, I., Reece, M., Mitoseriu, L., Yan, H.
Format: Article
Language:English
Subjects:
BiFeO3
Ceramics
Crystal structure
Dielectric properties
Dielectrics
Doping
Dysprosium
Ferromagnetism
Frequency ranges
Magnetic fields
Multiferroics
Perovskite structure
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Summary:The polycrystalline samples of multiferroic Bi1−xDyxFeO3 (x=0, 0.1, and 0.2) were prepared by a modified solid state reaction method and characterized by X-ray diffraction, scanning electron microscopy, differential thermal analysis, dielectric and magnetic measurements. It was shown that the introduction of the Dy3+ ions stabilizes the perovskite structure and improves phase purity. The coexistence of the rhombohedral and orthorhombic phases was found to exist within the investigated concentration range 0.1≤x≤0.2. The changes and anomalies observed in dielectric response over a wide frequency range were correlated with the structural evolution and the development in microstructure. The SQUID measurements of the field-dependent magnetization at different temperatures demonstrated Dy doping to be a very effective method for inducing a weakly ferromagnetic state in the ferroelectric R3c phase of BiFeO3 in the absence of an external magnetic field.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2013.10.002