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.

Meander pattern of spiral wave and the spatial distribution of its cycle length.

One of the most interesting dynamics of rotating spiral waves in an excitable medium is meandering. The tip of a meandering spiral wave moves along a complex trajectory, which often takes the shape of an epitrochoid or hypotrochoid with inward or outward petals. The cycle lengths (CLs) of a meandering spiral wave are not constant; rather, they depend on the meandering dynamics.

Exploring the defect equilibrium and charge transport in electrode material LaSrFeMoO.

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.

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.