High electrical conductivity at room temperature of MnCo2O4 cobaltite spinel prepared by sol–gel method

The cobaltite spinel MnCo 2 O 4 nanopowder was prepared by the sol–gel method. X-ray diffraction shows the pure compound that crystallized in the cubic structure with the Fd 3 - m space group. The infrared spectrum (IR) revealed two absorption peaks that can be attributed to Mn–O and Co–O vibrations...

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Veröffentlicht in:Journal of materials science. Materials in electronics 2021, Vol.32 (1), p.1221-1232
Hauptverfasser: Zaouali, Ameni, Dhahri, Ahmed, Boughariou, Aicha, Dhahri, Essebti, Régis Barillé, Costa, B. F. O., Khirouni, Kamel
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Sprache:eng
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Zusammenfassung:The cobaltite spinel MnCo 2 O 4 nanopowder was prepared by the sol–gel method. X-ray diffraction shows the pure compound that crystallized in the cubic structure with the Fd 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 (40–10 6 Hz) 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 and the Drude model at high temperatures T > 340K. Moreover, the dielectric result shows the permittivity (ε '≈ 10 3 ) which is due to the contribution of the Maxwell–Wagner polarization.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-020-04895-2