Room-Temperature Ferromagnetism in Nickel-Doped Wide Band Gap Ferroelectric Bi₀.₅K₀.₅TiO₃ Nanocrystals

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  • Van Thiet Duong
    School of Engineering Physics, Ha Noi University of Science and Technology Department of Physics, University of Ulsan
  • Cuong Do Duc
    Department of Physics, University of Ulsan
  • Bac Luong Huu
    School of Engineering Physics, Ha Noi University of Science and Technology
  • Cuong Le Viet
    Laboratory for Micro-Nano Technology, University of Engineering and Technology
  • Khoa Ha Dang
    School of Engineering Physics, Ha Noi University of Science and Technology
  • Cho Sunglae
    Department of Physics, University of Ulsan
  • Tuan Nguyen Hoang
    School of Engineering Physics, Ha Noi University of Science and Technology
  • Dung Dang Duc
    School of Engineering Physics, Ha Noi University of Science and Technology

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  • Room-Temperature Ferromagnetism in Nickel-Doped Wide Band Gap Ferroelectric Bi<sub>0.5</sub>K<sub>0.5</sub>TiO<sub>3</sub> Nanocrystals

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We report the effect of nickel doping on the structural, optical, and magnetic properties of Bi0.5K0.5TiO3 nanocrystal. The X-ray diffraction results indicated that Ni was substituted into the Ti sites in Bi0.5K0.5TiO3 and the NiTiO3 phase was formed when Ni concentration was higher than 3 mol%. The band gap value decreased from 3.31 eV to 2.96 eV when the Ni concentration changed from 0 to 3 mol% and then increased with higher Ni concentration. Both weak-ferromagnetism and diamagnetism coexisted in un-doped Bi0.5K0.5TiO3 samples. The ferromagnetic signal strongly influenced the paramagnetic signal for Ni-doped Bi0.5K0.5TiO3 samples at room temperature. The room-temperature ferromagnetism in Ni-doped Bi0.5K0.5TiO3 samples could be contributed by intrinsic reason due to presence of Ni ion in Bi0.5K0.5TiO3 crystal and by extrinsic reason due to segregation of NiTiO3 clusters when Ni concentration was over 3 mol% threshold. This method may provide a useful way to get both single-phase multiferroics and composite multiferroics materials.

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