Carbon combustion synthesis of Janus-like particles of magnetoelectric cobalt ferrite and barium titanate

C. Trevino De Leo, G.c. Dannangoda, M.a. Hobosyan, J.t. Held, F. Safi Samghabadi, M. Khodadadi, D. Litvinov, Andre Mkhoyan, K.s. Martirosyan

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Carbon combustion synthesis of oxides was applied for quick and energy efficient production of multiferroic composite of cobalt ferrite and barium titanate to form Janus-like particles matrix structure. The exothermic oxidation of carbon nanoparticles with an average size of 5 nm and a specific surface area of 110 m 2/g generates a self-propagating thermal wave with peak temperature of up to 1000 °C. The thermal front rapidly propagates through the mixture of solid reactants (magnetic- CoFe 2O 4 and ferroelectric-BaTiO 3) and results in localized hot-spot sintering of magneto-electric phases to form a nanocomposite structure. Carbon is not incorporated in the product and is emitted as a gaseous CO 2. Existence of discrete CoFe 2O 4 and BaTiO 3phases in the composites nanostructures was confirmed using X-ray powder diffraction along with SEM and TEM analysis. We estimated the activation energy for the combustion synthesis of Janus-like particles to be 112 ± 3.3 kJ/mol, indicating that the barium titanate and cobalt ferrite presence decrease the activation energy barrier of carbon oxidation and facilitate the ignition process of the combustion synthesis. We observe that the as-synthesized samples show magnetoelectric coupling on multiferroic cobalt ferrite–barium titanate ceramic composites.

Original languageEnglish (US)
Pages (from-to)5415-5422
Number of pages8
JournalCeramics International
Issue number4
StatePublished - Feb 15 2021

Bibliographical note

Funding Information:
We would like to acknowledge the financial support for this research by National Science Foundation ( NSF ) PREM (award DMR-1523577: UTRGV- UMN Partnership for Fostering Innovation by Bridging Excellence in Research and Student Success) and NSF CBET-1928334 grant. J.T.H. and K.A.M. acknowledge support from the NSF MRSEC program under Awards DMR-1420013 and DMR-2011401 . STEM analysis was performed in the Characterization Facility of the University of Minnesota , which receives partial support from the NSF through the MRSEC program.

Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.

How much support was provided by MRSEC?

  • Partial


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