Structural and Dielectric Properties of Bismuth Doped Cobalt Nano Ferrites Prepared by Sol-Gel Auto Combustion Method

National Conference on Processing and Characterization of Materials

Routray, Krutika L.^1 ; Behera, Dhrubananda^1

Department of Physics and Astronomy, National Institute of Technology, Rourkela, India^1

关键词: AC impedance measurement;    Chemical compositions;    CoFe2O4;    Conduction Mechanism;    Dielectric studies;    Field emission scanning electron microscopes;    Single-phase spinel structure;    Sol-gel auto-combustion;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/178/1/012007/pdf
DOI  :  10.1088/1757-899X/178/1/012007

来源: IOP

【 摘 要 】

The present study is focused on the preparation of a series of Bismuth doped CoFe2O4(CFO) nanoparticles and its structural and dielectric properties. The CFO particles having chemical composition CoBixFe2-xO4(where x = 0.0, 0.1, 0.5) has been synthesized using sol-gel auto combustion method. Phase formation study of the prepared samples is carried out using X -ray diffraction (XRD) technique. It reveals single phase spinel structure having space group Fd3m. The two absorption bands v1and v2are observed in Fourier transform infrared spectroscopy (FTIR) spectra corresponding to the tetrahedral and octahedral sites, which show mark of spinel structure of the samples. Morphological study is carried out using Field Emission Scanning Electron Microscope (FESEM) and Transmission Electron Microscopy (TEM) which revealed that the particle size obtained is around 40 nm to 120 nm. In addition, phase formation has been confirmed from the analysis of Raman spectra. Different types of conduction mechanism of the charge carriers have been analysed with DC resistivity and AC impedance measurement at room temperature. Results demonstrate the presence of dielectric relaxation, which is found to be of non-Debye type.