The effect of temperature and oxygen partial pressure on the concentration of iron and manganese ions in LaSrFeMnO.

The oxygen content was measured in cubic perovskite-type LaSrFeMnO ( = 0.1, 0.17, 0.

Development of Membrane Reactor Coupling Hydrogen and Syngas Production.

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.

Impact of oxygen content on preferred localization of p- and n-type carriers in LaSrFeMnO.

The oxygen content in LaSrFeMnO, measured by coulometric titration in a wide range of oxygen partial pressure at various temperatures, was used for defect chemistry analysis. The obtained data were well approximated by a model assuming defect formation in LaSrFeMnO Fe and Mn oxidation reactions and charge disproportionation on Fe and Mn ions. The partial molar enthalpy and entropy of oxygen in LaSrFeMnO obtained by statistical thermodynamic calculations were found to be in satisfactory agreement with those obtained using the Gibbs-Helmholtz equations, thus further confirming the adequacy of the model.

Impact of A-Site Cation Deficiency on Charge Transport in LaSrFeO.

The electrical conductivity of LaSrFeO, investigated as a function of the nominal cation deficiency in the A-sublattice, , varying from 0 to 0.02, has demonstrated a nonlinear dependence. An increase in the value from 0 to 0.

Synthesis and Characterization of Ti-Nb Alloy Films Obtained by Magnetron Sputtering and Low-Energy High-Current Electron Beam Treatment.

The aim of the present work is to investigate the synthesis of Ti-Nb alloy films obtained by the physical vapor deposition (PVD) magnetron sputtering of Nb films on Ti substrates, followed by low-energy high-current electron beam (LEHCEB) alloying treatment. Ti-Nb alloys were synthetized under two different regimes, one by varying the deposited amount of Nb (from 25 to 150 nm) and treating samples with low applied voltages and a number of pulses (three pulses at either 20 or 25 kV), the second by setting the amount of Nb (100 nm) and alloying it at a higher applied voltage with a different number of pulses (from 10 to 50 at 25 and 30 kV). The synthetized Ti-Nb alloys were characterized by XRD and GDOES for phase identification and chemical composition; SEM and optical microscopy were employed for morphology evaluation; compositional investigation was done by EDS analysis and mechanical properties were evaluated by microindentation tests.

Non-uniform electron conduction in weakly ordered SrFeMoO.

The electrical conductivity of SrFe1-xMoxO3-δ (0.07, 0.15, 0.