International Conference

Permanent URI for this collectionhttps://dspace.psgrkcw.com/handle/123456789/41

Browse

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    GROWTH OF CE ADDED NBT-BT SINGLE CRYSTAL BY FLUX METHOD AND ITS CHARACTERIZATION
    (AIP, 2013) S, Shanmuga Sundari; R, Dhanasekaran
    The ferroelectric properties and piezoelectric properties are enhanced by the addition of CeO2. CeO2 in the 0.94Na0.5Bi0.5TiO3−0.06BaTiO3 (NBT-BT). 0.4 wt% of CeO2. CeO2 added NBT-BT crystals were grown by flux method.X-ray diffraction studies show that the Ce ion diffuses into the NBT-BT lattice to form a solid solution. Temperature dependence of dielectric constant for the frequency range 20 Hz-2 MHz is studied. Due to the addition of CeO2 the dielectric loss is found to be 1.1 for 1kHz. The diffuseness parameter is found to be 1.82.
  • No Thumbnail Available
    Item
    INDUCED FERROMAGNETISM IN FE DOPED CEO2 NANOPARTICLES
    (Elsevier, 2018) S, Shanuga Sundari; S, Sugan; G, Pabitha
    Ceria / CeO2 / Cerium nanoparticles are fluorite-structured rare earth oxide. Cerium oxide is an important material which finds applications as polishing agents, sunscreens, solid electrolytes, and automotive exhaust catalysts. Nano structured CeO2 is very attractive due to its improvements in the redox properties, transport properties and surface to volume ratio with respect to bulk materials. In the present work, CeO2 nanoparticles and Fe doped CeO2 (CeO2 + x mole% of Fe, where x= 1, 2, 3, 4 and 5) have been prepared by co-precipitation method. All the prepared samples were characterized for its structural, optical and magnetic properties by XRD, FTIR, SEM, UV-Vis and VSM analysis respectively. The absence of secondary peaks and cubic fluorite structures were confirmed by XRD and a complete solid solution was achieved between Fe and Ce in all the prepared samples. Uniform spherical like structures was observed from SEM micrographs. Scherrer’s formula was used to calculate the crystallite size and there is no much variation by the incorporation of Fe in CeO2 matrix. UV-Vis spectral analysis was carried out using DRS method and the absorption coefficient, direct band gap was calculated for all the prepared CeO2 nanoparticles. The pristine CeO2 is diamagnetic in nature. The doping of Fe in CeO2 induces ferromagnetism in CeO2 and the hysteresis area increases till 3 mol% of Fe and decreasing for further increase in concentration. Hence to induce a ferromagnetic property in CeO2 nanoparticles 3 mol% of Fe is optimum.