Structural and electrical properties of theceramics based on spinel MnxCo1-xAl2O4 compounds
International Journal of Development Research
Structural and electrical properties of theceramics based on spinel MnxCo1-xAl2O4 compounds
Received 14th July, 2020; Received in revised form 09th August, 2020; Accepted 07th September, 2020; Published online 30th October, 2020
Copyright © 2020, Keydson Quaresma Gomes et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Ceramic pellets of MnxCo1-xAl2O4 compounds were investigated by powder X-ray diffraction method, as well as electrical properties with resistance analysis by the two-point method and complex impedance measurements. The manganese oxide was added to the system at molar fraction ratios of x = 0.05, 0.30, 0.50, 0.70, and 0.95. It was obtained samples from these compositions and were sintered at 1773 K for 5 h. The X-ray diffraction results were refined by the Rietveld method, and thus, we could determine the type of structure system as being spinel. The results of the AC electrical response (impedance spectroscopy) showed that at lower frequencies the largest contribution to the conductivity of the sample comes from the grain boundary. The best conductivity was observed in the Mn0.50Co0.50Al2O4 sample.
