Rare earth and transition metal doped BiFeO3 ceramics: structural, magnetic and dielectric characterization
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Here we studied the effect of rare earth (Y) and transition metal (Co, Ni) substitution on the structure, magnetic and dielectric properties of the BiFeO3 (BFO) multiferroic ceramic. The samples were synthesized by modified rapid liquid phase sintering method. The phase purity and structural characteristics of the ceramics were investigated by X-ray diffraction and scanning electron microscope. The results revealed the uniform micro-structure with reduced grain size due to the rare earth doping in the BFO. Compared to the pure BFO, enhanced coercivity and resistivity were observed for the co-doped ceramics with Y and Co. The improvement of temperature stability of magnetism and electrical conductivity was found for ceramic co-doped with Y+3 and Ni+2 ions. The possible origin of the improvement in these properties has been discussed on the basis of the size effect and nature of the dopants.
KeywordsBiFeO3 Impurity Phase Remnant Magnetization Multiferroic Property Depolarization Field
The author would like to acknowledge the support received from the Fundação de Amparo à Pesquisa do Estado de Goiás (FAPEG) project Grant DCR-14/2013 and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) postdoctoral fellowship Grant 300810/2015-6. One of us (A.F.Jr.) is a CNPq fellow under Grant No. 308183/2012-6. The authors would also like to acknowledge the help received from Juracy Leandro in the Electronic Lab and Hermínia Pessoni in Synthesis Lab.