Multiferroic Heterostructure BaTiO3/ε-Fe2O3 Composite Obtained by in situ Reaction

  • S. Filipović Institute of Technical Sciences of SASA
  • N. Obradović Institute of Technical Sciences of SASA
  • Lj. Andjelković University of Belgrade, Institute of Chemistry, Technology and Metallurgy, Department of Chemistry
  • D. Olćan University of Belgrade – School of Electrical Engineering
  • J. Petrović University of Belgrade – School of Electrical Engineering
  • M. Mirković Department of Materials, VINČA Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade
  • V. Pavlović University of Belgrade, Faculty of Agriculture
  • D. Jeremić Innovative Centre of the Faculty of Chemistry, University of Belgrade
  • B. Vlahović North Carolina Central University
  • A. Đorđević Serbian Academy of Sciences and Arts; University of Belgrade – School of Electrical Engineering


Solid-state reaction between BaTiO3 and Fe2O3 was used to produce a multiferroic heterostructure composite. Commercial BaTiO3 and Fe(NO3)3•9H2O were suspended in ethanol for 30 minutes in an ultrasound bath. The prepared mixture was thermally processed at 300 oC for 6 h. Sintering at 1300 oC for 1 h resulted in a mixture of different phases, BaTiO3, BaFe12O19 and Ba12Ti28Fe15O84, which were confirmed by x-ray powder diffraction. A dense microstructure with a small volume fraction of closed porosity was indicated by the scanning electron microscopy, while a homogeneous distribution of Fe ions over BaTiO3 phase was visible from energy dispersive spectroscopy mapping. Doping of BaTiO3 with Fe2O3 resulted in formation of magnetic hexaferrite phases, as confirmed by dielectric measurements that showed a broadened maximum of the permittivity measured as a function of temperature.