High electrical conductivity at room temperature of MnCo2O4 cobaltite spinel prepared by sol–gel method
| Autor: | A. Boughariou, A. Dhahri, Benilde F.O. Costa, E. Dhahri, Kamel Khirouni, Ameni Zaouali, Regis Barille |
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| Rok vydání: | 2021 |
| Předmět: |
Permittivity
Materials science Spinel Analytical chemistry Dielectric engineering.material Conductivity Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Dielectric spectroscopy Cobaltite chemistry.chemical_compound chemistry Electrical resistivity and conductivity engineering Electrical and Electronic Engineering Polarization (electrochemistry) |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 32:1221-1232 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-020-04895-2 |
| Popis: | The cobaltite spinel MnCo2O4 nanopowder was prepared by the sol–gel method. X-ray diffraction shows the pure compound that crystallized in the cubic structure with the Fd $$\stackrel{-}{3}$$ m space group. The infrared spectrum (IR) revealed two absorption peaks that can be attributed to Mn–O and Co–O vibrations in the octahedral and tetrahedral sites, respectively. The electrical and dielectric studies were characterized by impedance spectroscopy (IS) at different frequencies (40–106Hz) and temperatures (200–440K). As a matter of fact, the DC conductivity exhibits a semiconductor behavior. It is worth mentioning that the conductivity of our investigated cobaltite spinel was found to be σ = 6.10−3 Sm−1 at room temperature. These results allowed this material to be a good candidate for potential application as an anode material (fuel cell). The AC conductivity obeys the Jonscher's law at low temperatures T 340K. Moreover, the dielectric result shows the permittivity (e '≈ 103) which is due to the contribution of the Maxwell–Wagner polarization. |
| Databáze: | OpenAIRE |
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