Abstract.A moderate-temperature method of preparation of the spinel LiMn204 was developed around 500 ~ Physical features of the products were identified by X-ray photoelectron spectroscopy, X-ray diffractometry, Raman scattering and FTIR spectroscopy. The electronic conductivity of LiMn20 4 has been studied as a function of annealing temperature. The product LiMn20 4 is identified as a micron-sized powder and analysis of the local environment is in good accordance with the classical structural model of Fd3m space group. LiMn204 exhibits an electrical conductivity of 1.9x10 -5 S/cm at room temperature with an activation energy of 0.16 eV which corresponds to an electron hopping mechanism between the two charge states of Mn 3+ and Mn 4+ ions. A first-order phase transition is observed at 292 K.
The dielectric breakdown voltage of MgMnNi/transformer oil‐based nanofluids was systematically investigated under the influences of an electric field. The experimental behavior appears to come to a maximal end value of the breakdown voltage at around 72 kV. The prepared dielectric fluid has been investigated for use as high‐voltage insulation. The dielectric strengths of these nanofluids increase possibly due to enhanced electric field dissipation due to the presence of magnetite nanoparticles in fluids. The zeta potential value was found to be −18.8 mV, which shows that the nanoparticles are highly stable even at a pH 10. The thermophysical properties were performed using KD2 Pro method, and for viscosity measurements, DV‐E viscometer was used.
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