Navegando por Autor "Banerjee, Prasun"

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    Insights into the dielectric loss mechanism of bianisotropic FeSi/SiC composite materials
    (2020) Banerjee, Prasun; Kumar, Nagasamudram Suresh; Franco Júnior, Adolfo; Swain, Akshaya Kumar; Naidu, Kadiyala Chandra Babu
    High magnitudes of permittivity with the permeability of the materials help to absorb electromagnetic waves more efficiently. Snoek’s limit directly puts a constraint on the enhancement of the permeability of the material. However, the incorporation of the lossy material may help to enhance the permittivity abruptly. In this study, we prepared a FeSi/SiC composite material with the mechanical ball milling method and investigated its enhancement of the dielectric behavior. The bianisotropic nature was observed along with the phase purity in the morphological studies. The Cole−Cole relaxation mechanisms were observed to validate a complex relaxation mechanism with 104 times higher dielectric loss in the composite material. The detection of the Warburg capacitance using the impedance technique sheds new light on the ion diffusion mechanism in the metallic composite materials.
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    Intercalation of nanoscale multiferroic spacers between the two-dimensional interlayers of MXene
    (2022) Koneru, Bhargavi; Swapnalin, Jhilmil; Natarajan, Srinivasan; Franco Júnior, Adolfo; Banerjee, Prasun
    We report a facile synthesis of MXene/bismuth ferrite (Ti3C2Tx @ BiFeO3) nanocomposites using hydrazine hydrate induced with the hydrothermal method. Preparation of the composite with hydrazine hydrate prevents the formation of Bi25FeO39 inside the matrix. The 25 wt % loading of BiFeO3 acts as spacers for the multilayer restacking of MXene flakes by retaining the (002) plane. This promotes large dc conductivity with interfacial and defect dipole polarization mechanisms inside the composite material. The thinner M-H loop also indicates the minimal magnetic loss inside the composites. The facile synthesis strategy provides outstanding properties in Ti3C2Tx @ BiFeO3 composites as two-dimensional multiferroic materials.
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    On the magnetic properties of the multiferroic ceramics Bi0:99Y0:01Fe1-xNixO3 Bi0:99Y0:01Fe1 xNixO3
    (2018) Ratkovski, Danilo Roberto; Ribeiro, P. R. T.; Machado, Fernando Luis de Araujo; Banerjee, Prasun; Franco Júnior, Adolfo
    Multiferroic ceramics of Bi0:99Y0:01Fe1 xNixO3 with 0:01 6 x 6 0:05 were synthesized by using a modified solid state reaction method. The crystalline structure and the morphology of the samples were investi gated by X-ray diffraction (XRD) and by scanning electron microscopy (SEM). The addition of Y and Ni to the bismuth ferrite (BiFeO3) was found to decrease the average grain size. Ac magnetic susceptibility and the zero-field-cooled (ZFC) and field-cooled (FC) magnetizations were measured for temperatures in the range 5 6 T 6 300 K. Hysteresis loops and an irreversible behavior in the temperature dependence of the magnetization not present in pure BiFeO3 were observed in the doped samples. However, the ferro magnetism was found more likely to be due to the presence of small amounts of magnetite. Nevertheless, the determination of the amount of Fe3O4 in these composite materials is important because it influences the magnetoelectric coupling which is important for some technological applications