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Thermally stimulated oxygen desorption in Sr2FeMoO6-δ

Kalanda, Nikolay A.


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{
  "description": "<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>", 
  "license": "https://creativecommons.org/licenses/by/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "Scientific-Practical Materials Research Centre of NAS of Belarus, Minsk, Belarus", 
      "@type": "Person", 
      "name": "Kalanda, Nikolay A."
    }
  ], 
  "headline": "Thermally stimulated oxygen desorption in Sr2FeMoO6-\u03b4", 
  "image": "https://zenodo.org/static/img/logos/zenodo-gradient-round.svg", 
  "datePublished": "2018-05-01", 
  "url": "https://zenodo.org/record/2551905", 
  "keywords": [
    "strontium ferromolybdate", 
    "oxygen nonstoichiometry", 
    "defect formation", 
    "oxygen desorption"
  ], 
  "@context": "https://schema.org/", 
  "identifier": "https://doi.org/10.3897/j.moem.4.1.33270", 
  "@id": "https://doi.org/10.3897/j.moem.4.1.33270", 
  "@type": "ScholarlyArticle", 
  "name": "Thermally stimulated oxygen desorption in Sr2FeMoO6-\u03b4"
}
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