The crystalline and electronic band structures, thermodynamic stability, oxygen non-stoichiometry and high-temperature transport properties of perovskite-like solid solutions with a general formula SrFeTaO, where , ≥ 0, are thoroughly studied using a combination of experimental and theoretical methods. It is argued that the basic compound SrFeTaO possesses an orthorhombic lattice symmetry, while its tantalum-doped derivatives belong to a tetragonal space group. Importantly, the purposeful addition of a certain deficiency in a strontium sublattice is shown to be a valid method for stabilizing the SrFeTaO oxides with an excess tantalum content.
View Article and Find Full Text PDFMembranes (Basel)
June 2023
Simultaneous syngas and pure hydrogen production through partial oxidation of methane and water splitting, respectively, were demonstrated by using mixed ionic-electronic conductors. Tubular ceramic membranes prepared from LaSrFeO perovskite were successfully utilized in a 10 M lab scale reactor by applying a radial arrangement. The supply of methane to the middle area of the reaction zone was shown to provide a uniform distribution of the chemical load along the tubes' length.
View Article and Find Full Text PDFPhys Chem Chem Phys
September 2022
Perovskite-type LaSrFeMoO synthesized glycine nitrate combustion and sintered at 1350 °C was found to have an orthorhombic lattice, which transforms upon heating into a rhombohedral and then a cubic one. The oxygen content and electrical conductivity in this oxide were measured in the range of oxygen partial pressures from 10 to 0.5 atm at 750-950 °C by coulometric titration and four-probe dc techniques, respectively.
View Article and Find Full Text PDFData of otoneurologic, audiologic and vestibulometric research were analyzed in both adult and child patients suffering from acute otitis media with focus on probable spread of inflammatory non-purulent process into inner ear and brain. Combination of available printed data and own research during the 2010-2021 y.y.
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