Influence of Y and Co co-doping in the multiferroic behaviors of BiFeO3 ceramics
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2017
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Single phase of pure BiFeO3 (BFO) and
Bi0.99Y0.01Fe1−xCoxO3 (0.01 ≤ x ≤ 0.03) (BYFC) multiferroic ceramics were prepared by using a modified solid state
reaction method. The scanning electron microscope (SEM)
images revealed that the grain size and morphology were
dependent on the nature of dopant. X-ray diffraction peaks
were found to belong to the pure BFO structure with R3c
space group of symmetry. It was found that the dielectric
constant (휀′
) values increased ∼13.5 times with the addition of Co ions; being ∼170 and ∼2300, for pure BFO and
x = 0.01, respectively, at the lower frequencies (100 Hz).
The dielectric behavior was described by the modified
Cole–Cole model. Ferromagnetic (FM) ordering with saturation magnetization, Ms, and coercivity Hc values of ∼0.75
emu/g and ∼400 Oe, was found in the BYFC ceramics at
x = 0.03 at room temperature. A decrease in the band gap
was observed due to the amount of doping in the BYFC
ceramics. The origin of the enhanced dielectric and magnetic properties was discussed on the basis of the size effect
and the nature of the dopants like Y3+, Co2+ and Co3+ ions
in the lattice structure of the doped ceramics.
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BANERJEE, P.; FRANCO JR, A. Influence of Y and Co co-doping in the multiferroic behaviors of BiFeO3 ceramics. Journal of Materials Science: materials in electronics, Berlin, v. 28, p. 8562-8568, 2017. DOI: 10.1007/s10854-017-6579-1. Disponível em: https://link.springer.com/article/10.1007/s10854-017-6579-1. Acesso em: 4 set. 2023.