Kinetics of Reaction with Oxygen of LnBa1-XSrxCo2-YFeyO6-δ (Ln - Selected Lanthanides) Oxides as Studied by Relaxation Methods
In this work we present results concerning simultaneous determination of D and K, measured by mass and electrical conductivity relaxation techniques for perovskite-type oxides with LnBa1-xSrxCo2-yFeyO6-δ (Ln - selected lanthanides) chemical formula. The measurements were performed at elevated temperatures (600-800 ºC) in a wide range of oxygen partial pressures. The obtained results were analyzed taking into account crystal structure and the oxygen content in the considered compounds at high temperatures. It allowed to determine the correlation between structural (radius of Ln cation, degree of unit cell distortion, metal-oxygen-metal angle, unit cell free volume) and transport properties (oxygen diffusion coefficient, surface exchange coefficient, ionic and electronic component of the electrical conductivity) in the considered LnBa1-xSrxCo2-yFeyO6-δ.
The project was funded by the National Science Centre Poland (NCN) on the basis of the decision number DEC-2012/05/E/ST5/03772.
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