The effect of bismuth on the structure, magnetic and electric properties of Co2MnO4 spinel multiferroic

Chouaya, H.; Smari, M.; Walha, I.; Dhahri, E.; Graça, M.P.F.; Valente, M.A.

doi:10.1016/j.jmmm.2017.11.068

Cited by 27 publications

(14 citation statements)

References 22 publications

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“…It is therefore likely that Fe 3+ replaces Co 2+ at tetragonal sites in the reference spinel and that the increase in lattice constant is due to charge compensation by Co and Mn on the octahedral sites. The results are consistent with those obtained by other investigators [5][6][7][8]. To determine the deviation of the Fe 0.1 Mn 1.45 Co 1.45 O 4 powder obtained via EDTA gel processes after 8 h of calcination in air at 973 K from its nominal composition, its actual composition was determined using XRF.…”

Section: Resultssupporting

confidence: 88%

“…The activation energy of electrical conduction in the Fe 0.1 Mn 1.45 Co 1.45 O 4 spinel was 0.46 eV for temperatures over 723 K and 0.75 eV below 723 K. At 723 K, a change in slope of the conductivity curves is observed. These effects have been reported previously for similar spinel compositions [6,8,9]. One possible explanation is a change in the prevailing conduction mechanism.…”

Section: Resultssupporting

confidence: 86%

“…The linear character of electrical conductivity is typical for semiconductors with conductivity thermally activated through the hopping of small polarons [8][9][10]. This conductivity mechanism can be explained by the Arrhenius law, which is expressed by the equation where σ -the specific conductivity (S cm −1 ), T -temperature (K), C -a material constant containing the carrier concentration term (S cm −1 K), E a -the activation energy of electrical conduction (eV), and k -Boltzmann's constant (8.617 × 10 −5 eV/K).…”

Section: Resultsmentioning

confidence: 99%

“…Its electric conductivity (≈ 0.05 S/cm) is several times higher than that of chromium (≈ 0.01 S/cm). The physicochemical properties of Mn-Co spinel can be improved further using different types of additives, including Y, Cu, and Ni [5][6][7][8][9]. Gavrilov et al [5] obtained Mn-Co-O (MC) and Mn-Co-Y-O (MCYO) layers using coatings deposited via magnetron sputtering on ferritic stainless steel.…”

Section: Introductionmentioning

confidence: 99%

“…0.4 eV. Chouaya et al [8] demonstrated the possibility of obtaining Co 2 Mn 1−x Bi x O 4 with good physicochemical properties and dense microstructure. These samples were obtained via the sol-gel method with the citrate process.…”

Section: Introductionmentioning

confidence: 99%

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Structure and Electrical Properties of Fe-Mn-Co-O Spinel

Kruk

Brylewski

2019

Acta Phys. Pol. A

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Sub micro-sized Fe0.1Mn1.45Co1.45O4 powders were obtained using the sol-gel method with EDTA as a complexing agent. The sinters obtained from these powders were characterized by means of scanning electron microscopy, X-ray fluorescence, the Mössbauer spectroscopy, X-ray diffraction, and the 2-probe 4-point direct current method. The X-ray diffraction investigation of the sinter revealed that only the cubic phase had formed. Scanning electron microscopy showed that the sample was dense and exhibited a certain porosity. The addition of iron ions to the Mn1.5Co1.5O4 spinel reduced the electrical conductivity of the obtained sinter from ca. 60 to over 50 S/cm at 973 K. The Mössbauer studies showed the full incorporation of iron into the lattice structure of Mn1.5Co1.5O4. In conclusion, the iron-doped spinel appears to be suitable for the surface modification of ferritic stainless steel substrates used in solid oxide fuel cells interconnects.

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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 86%