March 5, 2020 Journal article Open Access

Nikolay Kalanda; Marta Yarmolich; Dong–Hyun Kim; Dalis Baltrūnas; Kestutis Mažeika; Sigitas Tamulevičius; Mindaugas Andrulevičius; Nikolai A. Sobolev

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{
  "inLanguage": {
    "alternateName": "eng", 
    "@type": "Language", 
    "name": "English"
  }, 
  "description": "<p>The activation energy of oxygen diffusion in strontium ferromolybdate Sr<sub>2</sub>FeMoO<sub>6&ndash;<em>&delta;</em></sub>&nbsp;is determined by the Merzhanov technique based on the temperature dependences of the oxygen desorption dynamics. The activation energy has a minimum value of 76.7&thinsp;kJ&thinsp;mol<sup>&minus;1</sup>&nbsp;at&nbsp;<em>&delta;</em>&thinsp;=&amp;thinsp;0.005 and a maximum value of 156.3&thinsp;kJ&thinsp;mol<sup>&minus;1</sup>&nbsp;at&nbsp;<em>&delta;</em>&thinsp;=&amp;thinsp;0.06. It is suggested that with an increase in the concentration of oxygen vacancies, an interaction occurs between them and the nearest cations, with the subsequent formation of associates of various types that are less mobile than the single anion vacancies. According to M&ouml;ssbauer spectroscopy data, it has been established that the appearance of oxygen vacancies and their ordering contribute to the isomer shift, and some of the iron ions occupy the tetrahedral (or close to it) positions in the lattice. This indicates the formation of associates of oxygen vacancies. The results of X\u2010ray photoelectron spectroscopy (XPS) studies show that the increase in the concentration of oxygen vacancies results in a decrease of the Mo<sup>6+</sup>&nbsp;and Fe<sup>2+</sup>&nbsp;concentrations. At the same time, the number of Mo<sup>5+</sup>&nbsp;and Fe<sup>3+</sup>&nbsp;cations increases due to the redistribution of the electron density, and molybdenum cations in a different valence state (Mo<sup>4+</sup>) appear.</p>", 
  "license": "https://creativecommons.org/licenses/by/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "Scientific\u2013Practical Materials Research Centre of the NAS of Belarus, P. Brovka St. 19, 220072 Minsk, Belarus", 
      "@type": "Person", 
      "name": "Nikolay Kalanda"
    }, 
    {
      "affiliation": "Scientific\u2013Practical Materials Research Centre of the NAS of Belarus, P. Brovka St. 19, 220072 Minsk, Belarus", 
      "@type": "Person", 
      "name": "Marta Yarmolich"
    }, 
    {
      "affiliation": "Department of Physics, Chungbuk National University, 1 Chungdaero, Seowongu, Cheongju 28644, South Korea", 
      "@type": "Person", 
      "name": "Dong\u2013Hyun Kim"
    }, 
    {
      "affiliation": "Center for Physical Sciences and Technology, Savanori\u0173 ave. 231, LT\u201302300 Vilnius, Lithuania", 
      "@type": "Person", 
      "name": "Dalis Baltr\u016bnas"
    }, 
    {
      "affiliation": "Center for Physical Sciences and Technology, Savanori\u0173 ave. 231, LT\u201302300 Vilnius, Lithuania", 
      "@type": "Person", 
      "name": "Kestutis Ma\u017eeika"
    }, 
    {
      "affiliation": "Institute of Materials Science of Kaunas University of Technology, Bar\u0161ausko St. 59, LT\u201351423 Kaunas, Lithuania", 
      "@type": "Person", 
      "name": "Sigitas Tamulevi\u010dius"
    }, 
    {
      "affiliation": "Institute of Materials Science of Kaunas University of Technology, Bar\u0161ausko St. 59, LT\u201351423 Kaunas, Lithuania", 
      "@type": "Person", 
      "name": "Mindaugas Andrulevi\u010dius"
    }, 
    {
      "affiliation": "Departamento de F\u00edsica and I3N, Universidade de Aveiro, 3810\u2013193 Aveiro, Portugal, & National University of Science and Technology MISiS, 119049 Moscow, Russia", 
      "@id": "https://orcid.org/0000-0002-9420-8130", 
      "@type": "Person", 
      "name": "Nikolai A. Sobolev"
    }
  ], 
  "headline": "Valence state of iron and molybdenum cations under conditions of anionic deficiency in Sr2FeMoO6\u2013\u03b4", 
  "image": "https://zenodo.org/static/img/logos/zenodo-gradient-round.svg", 
  "datePublished": "2020-03-05", 
  "url": "https://zenodo.org/record/3699964", 
  "version": "Author Accepted Manuscript", 
  "keywords": [
    "strontium ferromolybdate", 
    "oxygen stoichiometry", 
    "defect formation", 
    "oxygen desorption"
  ], 
  "@context": "https://schema.org/", 
  "identifier": "https://doi.org/10.5281/zenodo.3699964", 
  "@id": "https://doi.org/10.5281/zenodo.3699964", 
  "@type": "ScholarlyArticle", 
  "name": "Valence state of iron and molybdenum cations under conditions of anionic deficiency in Sr2FeMoO6\u2013\u03b4"
}