• Rajeev Ranjan

      Articles written in Bulletin of Materials Science

    • Synthesis of BiFeO3 by carbonate precipitation

      V Kothai Rajeev Ranjan

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      Magnetoelectric multiferroic BiFeO3 (BFO) was synthesized by a simple carbonate precipitation technique of metal nitrate solutions. X-ray powder diffraction and thermo-gravimetric analysis (TGA) revealed that the precipitate consists of an intimate mixture of crystalline bismuth carbonate and an amorphous hydroxide of iron. The precipitate yielded BiFeO3 at an optimal calcination temperature of ∼560°C. Energy dispersive X-ray (EDX) analysis showed 1:1 ratio between Bi and Fe in the oxide. X-ray photoelectron spectroscopy (XPS) studies confirmed that Fe to be in +3 oxidation states both in the precipitated powder and BiFeO3. The synthesized BFO exhibits a very weak ferromagnetic correlation at room temperature and the degree of which increases slightly on cooling down to 10 K suggesting alteration in the long range spatial modulation of the spins arrangement as compared to the bulk BiFeO3.

    • Conduction mechanism in rare earth-doped perovskite material through impedance analysis

      SWETA SHARMA M D SOAIB KHAN YOGESH KUMAR RAJEEV RANJAN

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      Perovskite (PVSK) has been considered as a promising material for electrochemical energy storage devices. In this paper, the conduction mechanism of rare earth europium-doped perovskite material, ${Pb_{1-x}Eu_x (Zr_{0.60}Ti_{0.40})_{1-x/4}O_3}$ as an electrode material for solar cell as well as supercapacitor has been studied. The structural and electrical properties were studied at room temperature for different compositions of Eu-doped PVSK, $x$ = 0.00, 0.03, 0.06 and 0.09. Europiumdoped PVSK was prepared via solid-state technique in the higher range of temperature. Structural and surface morphologies were done by X-ray diffraction and SEM. The electrical property has been studied via CIS technique at different frequencies. Study of ac conductivity and impedance analysis affirms PVSK as a potential material for the electrode of photo supercapacitor, a device which helps in the conversion of light energy into electrical and which also helps in energy storage mechanism.

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    • 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

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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