Journal article Open Access

Thermally stimulated oxygen desorption in Sr2FeMoO6-δ

Kalanda, Nikolay A.


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    <subfield code="a">&lt;p&gt;Polycrystalline Sr&lt;sub&gt;2&lt;/sub&gt;FeMoO&lt;sub&gt;6-δ&lt;/sub&gt; specimens have been obtained by solid state synthesis from partially reduced SrFeO&lt;sub&gt;2,52&lt;/sub&gt; and SrMoO&lt;sub&gt;4&lt;/sub&gt; precursors. It has been shown that during oxygen desorption from the Sr&lt;sub&gt;2&lt;/sub&gt;FeMoO&lt;sub&gt;6-δ&lt;/sub&gt; compound in polythermal mode in a 5%H&lt;sub&gt;2&lt;/sub&gt;/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&lt;sub&gt;2&lt;/sub&gt;FeMoO&lt;sub&gt;6-δ&lt;/sub&gt; compound the oxygen diffusion activation energy is the lowest Е&lt;sub&gt;а&lt;/sub&gt; = 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&lt;sub&gt;а&lt;/sub&gt; = 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&lt;sub&gt;o&lt;/sub&gt;&lt;sup&gt;••&lt;/sup&gt; leads to their mutual interaction followed by ordering in the Fe/Mo-01 crystallographic planes with the formation of various types of associations.&lt;/p&gt;</subfield>
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