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Lead-Free BNT–BT0.08/CoFe2O4 Core–Shell Nanostructures with Potential Multifunctional Applications

AuthorsCernea, Marin; Radu, Roxana; Amorín, Harvey ; Greculeasa, Simona Gabriela; Vasile, Bogdan Stefan; Surdu, Vasile Adrian; Ganea, Paul; Trusca, Roxana; Hattab, Marwa; Galassi, Carmen
Issue Date3-Apr-2020
PublisherMultidisciplinary Digital Publishing Institute
CitationNanomaterials 10 (4): 672 (2020)
AbstractHerein we report on novel multiferroic core&ndash;shell nanostructures of cobalt ferrite (CoFe<sub>2</sub>O<sub>4</sub>)&ndash;bismuth, sodium titanate doped with barium titanate (BNT&ndash;BT<sub>0.08</sub>), prepared by a two&ndash;step wet chemical procedure, using the sol&ndash;gel technique. The fraction of CoFe<sub>2</sub>O<sub>4</sub> was varied from 1:0.5 to 1:1.5 = BNT&ndash;BT<sub>0.08</sub>/CoFe<sub>2</sub>O<sub>4</sub> (molar ratio). X&ndash;ray diffraction confirmed the presence of both the spinel CoFe<sub>2</sub>O<sub>4</sub> and the perovskite Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub> phases. Scanning electron microscopy analysis indicated that the diameter of the core&ndash;shell nanoparticles was between 15 and 40 nm. Transmission electron microscopy data showed two&ndash;phase composite nanostructures consisting of a BNT&ndash;BT<sub>0.08</sub> core surrounded by a CoFe<sub>2</sub>O<sub>4</sub> shell with an average thickness of 4&ndash;7 nm. Cole-Cole plots reveal the presence of grains and grain boundary effects in the BNT&ndash;BT<sub>0.08</sub>/CoFe<sub>2</sub>O<sub>4</sub> composite. Moreover, the values of the <i>dc</i> conductivity were found to increase with the amount of CoFe<sub>2</sub>O<sub>4</sub> semiconductive phase. Both X-ray photoelectron spectroscopy (XPS) and M&ouml;ssbauer measurements have shown no change in the valence of the Fe<sup>3+</sup>, Co<sup>2+</sup>, Bi<sup>3+</sup> and Ti<sup>4+</sup> cations. This study provides a detailed insight into the magnetoelectric coupling of the multiferroic BNT&ndash;BT<sub>0.08</sub>/CoFe<sub>2</sub>O<sub>4</sub> core&ndash;shell composite potentially suitable for magnetoelectric applications.
Identifiersdoi: 10.3390/nano10040672
Appears in Collections:Colección MDPI
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