Rhombohedral-to-orthorhombic transition and multiferroic properties of Dy-substituted BiFeO3

resumo

Investigation of crystal structure, ferroelectric, and magnetic properties of polycrystalline Bi1-xDyxFeO3 (0.1 <= x <= 0.2) samples was carried out. X-ray diffraction study revealed composition-driven rhombohedral-to-orthorhombic R3c -> Pnma phase transition at x similar to 0.15. Both structural phases were found to coexist in a broad concentration range. Piezoresponse force microscopy found suppression of the parent ferroelectric phase upon dysprosium substitution. Magnetometric study confirmed that the A-site doping induces appearance of a weak ferromagnetic behavior. Both the ferroelectric and magnetic properties were shown to correlate with a structural evolution. (C) 2010 American Institute of Physics. [doi:10.1063/1.3486500]

palavras-chave

MAGNETIC-PROPERTIES; BISMUTH FERRITE; TEMPERATURE; CERAMICS; CRYSTAL; LA; PHASE

categoria

Physics

autores

Khomchenko, VA; Karpinsky, DV; Kholkin, AL; Sobolev, NA; Kakazei, GN; Araujo, JP; Troyanchuk, IO; Costa, BFO; Paixao, JA

nossos autores

agradecimentos

V.A.K. is grateful to the Foundation for Science and Technology of Portugal (FCT) for financial support through the

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