• VASUDEVA SIRUGURI

Articles written in Bulletin of Materials Science

• Investigation of multiferroic behaviour at room temperature in Bi-induced orthoferrite: combined experimental and first principles studies

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.

• # Bulletin of Materials Science

Volume 44, 2021
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020