Термостимулированная десорбция кислорода в Sr2FeMoO6-δ

Polycrystalline Sr 2 FeMoO 6-δ  specimens have been obtained by solid state synthesis from partially reduced SrFeO 2.52 and SrMoO 4 precursors. It has been shown that during oxygen desorption from the Sr 2 FeMoO 6-δ  compound in polythermal mode in a 5%H 2 /Ar gas flow at different heating rates, the oxygen index 6–δ depends on the heating rate and does not achieve saturation at T = 1420 K. Oxygen diffusion activation energy calculation using the Merzhanov method has shown that at an early stage of oxygen desorption from the Sr 2 FeMoO 6-δ  compound the oxygen diffusion activation energy is the lowest Е а = 76.7 kJ/mole at δ = 0.005. With an increase in the concentration of oxygen vacancies, the oxygen diffusion activation energy grows to Е а = 156.3 kJ/mole at δ = 0.06. It has been found that the dδ/d t = f ( Т ) AND dδ/d t = f (δ) functions have a typical break which allows one to divide oxygen desorption in two process stages. It is hypothesized that an increase in the concentration of oxygen vacancies  V ·· leads to their mutual interaction followed by ordering in the Fe/Mo–O1 crystallographic planes with the formation of various types of associations.