Solution combustion synthesis, characterization, magnetic, and dielectric properties of CoFe2O4 and Co0.5M0.5Fe2O4 (M = Mn, Ni, and Zn)
| Autor: | Harish C. Barshilia, R.V. Lakshmi, Ashish Shukla, B H Prakash, Parthasarathi Bera, Khushubo Tiwari, Asish K. Kundu, Krishanu Biswas |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Spinel Analytical chemistry General Physics and Astronomy 02 engineering and technology Dielectric engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Nanocrystalline material symbols.namesake X-ray photoelectron spectroscopy Octahedron 0103 physical sciences engineering symbols Physical and Theoretical Chemistry Fourier transform infrared spectroscopy 0210 nano-technology High-resolution transmission electron microscopy Raman spectroscopy |
| Zdroj: | Physical Chemistry Chemical Physics. 22:20087-20106 |
| ISSN: | 1463-9084 1463-9076 |
| Popis: | Nanocrystalline CoFe2O4 and Co0.5M0.5Fe2O4 (M = Mn, Ni, and Zn) ferrites were prepared by the solution combustion method using oxalyl dihydrazide as a fuel. These materials were characterized by several physicochemical techniques. X-ray diffraction (XRD) patterns indicate the cubic spinel structure of these ferrites. Field emission scanning electron microscopy (FESEM) images demonstrate the microporous nature of the materials because of the large amount of gas production during their synthesis. High resolution transmission electron microscopy (HRTEM) images show lattice fringes corresponding to the {220} and {311} planes of the spinel structure. Fourier transform infrared (FTIR) spectra exhibit absorption bands around the 500-600 cm-1 wavenumber region which are related to metal-oxygen bonds with tetrahedral coordination. Symmetric and asymmetric stretching and symmetric bending modes associated with tetrahedral and octahedral cations present in the spinel structures have been assessed by Raman spectroscopy. X-ray photoelectron spectroscopy (XPS) studies demonstrate the presence of Co2+, Mn2+, Ni2+, Zn2+, and Fe3+ in tetrahedral and octahedral coordinations in these ferrites. Co0.5Zn0.5Fe2O4 is observed to show the highest saturation magnetization among all these materials. The dielectric measurements reveal that the dielectric constant and loss values decrease with an increase in frequency and the ac conductivity increases at higher frequencies due to mobilization of the charge carriers. |
| Databáze: | OpenAIRE |
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