Abstract
La0.4Sr0.6CoO3−δ was prepared by the glycine nitrate process and characterized in respect of purity and phase composition by powder X-ray diffraction and analytical transmission electron microscopy. The oxygen-nonstoichiometry, as a function of oxygen partial pressure (10−4 bar<pO2<10−2 bar) and temperature (300°C<T<900°C) as well as the chemical diffusion coefficient (725°C and 825°C), were determined by means of oxygen exchange measurements. Electronic conductivity as measured with the van der Pauw-technique is given as a function of temperature (between 300°C and 900°C) and oxygen partial pressure. With the obtained values for the oxygen-nonstoichiometry of La0.4Sr0.6CoO3−δ, it is possible to take into account the change of the oxygen content of the sample with temperature and to calculate isostoichiometric (δ=constant) electronic conductivities. Additionally, chemical diffusion and surface exchange coefficients could be obtained from oxygen exchange measurements using simplified and exact fitting procedures.
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