Browsing by Author "Tangsali, R. B"

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    Microstructure and Magnetic Properties of Nano Crystalline Manganese Ferrite Thin Film Fabricated by Pulse Laser Deposition
    (American Scientific Publishers, 2016) Jaison, Joseph,; Tangsali, R. B; Mahadevan Pillai, V. P.; Choudhary, R. J.; Phase, D. M.; Ganeshan, V
    Nanoparticles of Mn Fe2O4 were chemically synthesized by precipitating the metal ions in aqueous alkaline solution with due optimization of reaction parameters. The XRD data of the powder sample comprising all prominent spinel peaks and clear visibility of ferrite absorption bands in FT-IR spectrum confirm single phase spinal formation. Nano grain size values of the sample derived from XRD data is authenticated by particle size viewed in TEM micrograph. Thin film fabricated from this nano material on quartz substrate by pulse laser deposition technique was characterized using XRD and Raman spectroscopic techniques. The XRD results of fabricated thin film indicate moderate degree of texture. AFM image of the thin film showed nano granular morphology with spherical particles of regular size and uniform distribution. Particle size analysis of AFM data suggest formation of thin film by near uniform clustering of nano grains whose dimensions match that of target material. Magnetic measurements of the textured nanocrystalline ferrite thin film revealed enhancement of magnetic properties. The enrichment of coercivity is explained on the basis of large magnetic anisotropy formation in thin film due to texture enhanced lattice strain and surface disorder.
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    Resistivity–thermopower correlation derived temperature-dependent transport behaviour of MnxZn1−xFe2O4 nanoparticles
    (Taylor & Francis, 2017) Joseph, Jaison; Tangsali, R. B; Gurav, S. M.
    Ferrite material nanoparticles comprised of manganese and zinc were chemically synthesized by the co-precipitation method. The designated ferrite X-ray diffraction peaks and characteristic ferrite absorption bands in Fourier transform infrared absorption spectra confirmed the formation of a spinel structure. Determination of the full width at half maximum values of the X-ray diffraction peaks and the corresponding calculations using the Scherrer formula suggested the generation of nano-grains. Micrographs obtained using a transmission electron microscope confirmed the nano-scale dimensions of the particles. Deviations in the characteristic resistivity and thermopower values in response to ambient sample temperature variations were experimentally observed and used for correlation-derived temperature-dependent transport behaviour analysis. Samples with a concentration x = 0.8 and 1.0 showed high thermopower values at reasonably low temperatures with moderate specific resistance.