• YOGESH KUMAR

      Articles written in Bulletin of Materials Science

    • A comparative study on phase co-existence of La$_{1/4}$Pr$_{3/8}$Ca$_3$/8MnO$_3$ in a polycrystalline bulk and thin film

      HARSH BHATT YOGESH KUMAR C L PRAJAPAT M K THOTA SURENDRA SINGH

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      We present a comparative study on phase co-existence in La$_{1/4}$Pr$_{3/8}$Ca$_{3/8}$MnO$_3$ (LPCMO) in a polycrystalline bulk and thin film form. The X-ray diffraction results confirm the formation of single-phase polycrystalline bulk and c-axisoriented strained epitaxial thin films on a LaAlO$_3$ substrate. Scanning electron microscopy images show a homogeneous microstructure growth for both the bulk as well as thin film samples. The temperature dependent magnetization curves for bulk and thin film show remarkably different features indicating the presence of very different phase separation scenarios.A two-step rise and a large thermal hysteresis are observed between zero-field cooled and field-cooled magnetization plots in the bulk sample. However, the magnetization of the film shows a very small hysteresis and a negligible signature of the CO-AFM state for the same composition. The field dependent magnetization plots indicate that in a bulk form LPCMO is a soft magnet and shows a metamagnetic behaviour while in a thin film form it acts as a hard magnet and the metamagnetic behaviour is completely lost.

    • 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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