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      https://www.ias.ac.in/article/fulltext/boms/043/0196

    • Keywords

       

      Bi-doped YFeO$_3$; crystal structure; valence state; multiferroicity; electronic structure.

    • Abstract

       

      Perovskite oxides are an important and exciting class of materials owing to the structural diversity with remarkable magnetic, optical and electronic behaviours. Here, a single-phase multiferroic orthoferrite, Y$_{0.74}$Bi$_{0.25}$FeO$_{2.97}$ (YBFO), has been synthesized by a conventional solid-state method. The crystal structure was refined using the Rietveld refinement method from powder X-ray diffraction data, and confirms an orthorhombic structure with the Pnma space group. The Curie-Weiss fitting to the magnetic susceptibility shows that the $\theta$-value is $–$926 K and $\mu_{\rm eff} = 5.59$ $\mu_{\rm B}$, exhibiting canted antiferromagnetism. Room temperature magnetic and ferroelectric hysteresis loops verify the presence of magnetic as well as ferroelectric ordering in the material with a remnant polarization ($P_{\rm r}$) of 0.27 $\mu$C cm$^{–2}$ and electric coercivity ($E_{\rm c}$) of 15 kV cm$^{–1}$. Temperature-dependent $P–E$ loops and pyrocurrent response confirm the inherent multiferroic nature of the material. The UV–visible study indicates a semiconductor nature with the bandgap of 1.86 eV. Density-functional theory calculations support the observed experimental behaviour and it signified the role of Bisubstitution. Even a very less concentration of Bi-doping can form an exciting room temperature multiferroic material.

    • Author Affiliations

       

      KUMARI NAVEEN1 NIKHIL KUMAR1 SONIA RANI2 TAPAS KUMAR MANDAL2 ANURAG GAUR3 P D BABU4 VASUDEVA SIRUGURI4 PRADIP K MAJI5 SUDIPTA KANUNGO6 AVIJIT KUMAR PAUL1

      1. Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra 136119, India
      2. Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
      3. Department of Physics, National Institute of Technology Kurukshetra, Kurukshetra 136119, India
      4. UGC-DAE Consortium for Scientific Research, Mumbai 400085, India
      5. Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Saharanpur 247001, India
      6. Indian Institute of Technology Goa, Ponda 403401, India
    • Dates

       
  • Bulletin of Materials Science | News

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