Thermally stimulated oxygen desorption in Sr2FeMoO6-δ
https://doi.org/10.17073/1609-3577-2018-1-48-53
Abstract
Polycrystalline Sr2FeMoO6-δ specimens have been obtained by solid state synthesis from partially reduced SrFeO2.52 and SrMoO4 precursors. It has been shown that during oxygen desorption from the Sr2FeMoO6-δ compound in polythermal mode in a 5%H2/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 Sr2FeMoO6-δ compound the oxygen diffusion activation energy is the lowest Еа = 76.7 kJ/mole at δ = 0.005. With an increase in the concentration of oxygen vacancies, the oxygen diffusion activation energy grows to Еа = 156.3 kJ/mole at δ = 0.06. It has been found that the dδ/dt = f(Т) AND dδ/dt = 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.
Supporting agencies: The support of the work in frames of the Deutsche Forschungsgemeinschaft (DFG) project no. SE 2714/2-1 and the European project H2020-MSCA-RISE-2017-778308-SPINMULTIFILM is gratefully acknowledged.
About the Author
N. A. Kalanda
Scientific-Practical Materials Research Centre of NAS of Belarus
Belarus
Belarus
Nikolay A. Kalanda: Cand. Sci. (Phys.-Math.), Leading Researcher
19 P. Brovki Str., Minsk, 220072
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For citations:
Kalanda N.A. Thermally stimulated oxygen desorption in Sr2FeMoO6-δ. Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering. 2018;21(1):48-53. (In Russ.) https://doi.org/10.17073/1609-3577-2018-1-48-53
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