Journal article Open Access

# Thermally stimulated oxygen desorption in Sr2FeMoO6-δ

Kalanda, Nikolay A.

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{
"publisher": "NUST MISiS",
"DOI": "10.3897/j.moem.4.1.33270",
"container_title": "Modern Electronic Materials",
"title": "Thermally stimulated oxygen desorption in Sr2FeMoO6-\u03b4",
"issued": {
"date-parts": [
[
2018,
5,
1
]
]
},
"abstract": "<p>Polycrystalline Sr<sub>2</sub>FeMoO<sub>6-\u03b4</sub> specimens have been obtained by solid state synthesis from partially reduced SrFeO<sub>2,52</sub> and SrMoO<sub>4</sub> precursors. It has been shown that during oxygen desorption from the Sr<sub>2</sub>FeMoO<sub>6-\u03b4</sub> compound in polythermal mode in a 5%H<sub>2</sub>/Ar gas flow at different heating rates, the oxygen index 6-\u03b4 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<sub>2</sub>FeMoO<sub>6-\u03b4</sub> compound the oxygen diffusion activation energy is the lowest \u0415<sub>\u0430</sub> = 76.7 kJ/mole at \u03b4 = 0.005. With an increase in the concentration of oxygen vacancies, the oxygen diffusion activation energy grows to \u0415<sub>\u0430</sub> = 156.3 kJ/mole at \u03b4 = 0.06. It has been found that the d\u03b4/dt = f (\u0422) and d\u03b4/dt = f (\u03b4) 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<sub>o</sub><sup>\u2022\u2022</sup> leads to their mutual interaction followed by ordering in the Fe/Mo-01 crystallographic planes with the formation of various types of associations.</p>",
"author": [
{
"family": "Kalanda, Nikolay A."
}
],
"page": "1-5",
"volume": "4",
"type": "article-journal",
"issue": "(1)",
"id": "2551905"
}
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