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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
KeywordsOxide materials
Sol-gel processes
Piezoelectric/ferromagnetic composites
Composite core–shell
Dielectric properties
Magnetic properties
Magnetoelectric properties
Issue Date2020
PublisherMultidisciplinary Digital Publishing Institute
CitationNanomaterials 10(4): 672 (2020)
AbstractHerein we report on novel multiferroic core–shell nanostructures of cobalt ferrite (CoFe2O4)–bismuth, sodium titanate doped with barium titanate (BNT–BT0.08), prepared by a two–step wet chemical procedure, using the sol–gel technique. The fraction of CoFe2O4 was varied from 1:0.5 to 1:1.5 = BNT–BT0.08/CoFe2O4 (molar ratio). X–ray diffraction confirmed the presence of both the spinel CoFe2O4 and the perovskite Bi0.5Na0.5TiO3 phases. Scanning electron microscopy analysis indicated that the diameter of the core–shell nanoparticles was between 15 and 40 nm. Transmission electron microscopy data showed two–phase composite nanostructures consisting of a BNT–BT0.08 core surrounded by a CoFe2O4 shell with an average thickness of 4–7 nm. Cole-Cole plots reveal the presence of grains and grain boundary effects in the BNT–BT0.08/CoFe2O4 composite. Moreover, the values of the dc conductivity were found to increase with the amount of CoFe2O4 semiconductive phase. Both X-ray photoelectron spectroscopy (XPS) and Mössbauer measurements have shown no change in the valence of the Fe3+, Co2+, Bi3+ and Ti4+ cations. This study provides a detailed insight into the magnetoelectric coupling of the multiferroic BNT–BT0.08/CoFe2O4 core–shell composite potentially suitable for magnetoelectric applications.
Description© 2020 by the authors.
Publisher version (URL)https://doi.org/10.3390/nano10040672
Appears in Collections:(ICMM) Artículos
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