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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">mateltech</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Материалы электронной техники</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1609-3577</issn><issn pub-type="epub">2413-6387</issn><publisher><publisher-name>MISIS</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/1609-3577-2023-1-5-16</article-id><article-id custom-type="edn" pub-id-type="custom">NHYGPN</article-id><article-id custom-type="elpub" pub-id-type="custom">mateltech-506</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ARTICLES</subject></subj-group></article-categories><title-group><article-title>Особенности кислородного обмена в лантан-стронциевых манганитах, допированных железом</article-title><trans-title-group xml:lang="en"><trans-title>Characteristic features of oxygen exchange in lanthanum-strontium manganites doped with iron</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5651-1000</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гурский</surname><given-names>А. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Gurskii</surname><given-names>A. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. П. Бровки, д. 6, Минск, 220013</p><p>Гурский Александр Леонидович — доктор физ.-мат. наук, профессор</p></bio><bio xml:lang="en"><p>6 P. Brovka Str., Minsk 220013</p><p>Alexander L. Gurskii — Dr. Sci. (Phys.-Math.), Professor</p></bio><email xlink:type="simple">algur106@tut.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7679-4968</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Каланда</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kalanda</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. П. Бровки, д. 19, Минск, 220072</p><p>Каланда Николай Александрович — канд. физ.-мат. наук, ведущий научный сотрудник</p></bio><bio xml:lang="en"><p>19 P. Brovka Str., Minsk 220072</p><p>Nikolay A. Kalanda — Cand. Sci. (Phys.-Math.), Leading Researcher</p></bio><email xlink:type="simple">kalanda@physics.by</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8005-2171</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ярмолич</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Yarmolich</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. П. Бровки, д. 19, Минск, 220072</p><p>Ярмолич Марта Викторовна — канд. физ.-мат. наук, заведующий отделом</p></bio><bio xml:lang="en"><p>19 P. Brovka Str., Minsk 220072</p><p>Marta V. Yarmolich — Cand. Sci. (Phys.-Math.), Head of the Department</p></bio><email xlink:type="simple">jarmolich@physics.by</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1208-5913</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Петров</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Petrov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. П. Бровки, д. 19, Минск, 220072</p><p>Петров Александр Владимирович — канд. физ.-мат. наук, старший научный сотрудник</p></bio><bio xml:lang="en"><p>19 P. Brovka Str., Minsk 220072</p><p>Alexander V. Petrov — Cand. Sci. (Phys.-Math.), Senior Researcher</p></bio><email xlink:type="simple">petrov@physics.by</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Киреев</surname><given-names>П. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Kireev</surname><given-names>P. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ул. Платонова, д. 41, Минск, 220005</p><p>Киреев Петр Николаевич — канд. техн. наук, заведующий отделением</p></bio><bio xml:lang="en"><p>41 Platonov Str., Minsk 220005</p><p>Petr N. Kireev — Cand. Sci. (Eng.), Head of Department</p></bio><email xlink:type="simple">ptrkir@tut.by</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет информатики и радиоэлектроники</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Belarusian State University of Informatics and Radioelectronics</institution><country>Belarus</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Научно-практический центр Национальной академии наук Беларуси по материаловедению</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Scientific-Practical Materials Research Centre of the National Academy of Sciences of Belarus</institution><country>Belarus</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Институт порошковой металлургии Национальной академии наук Беларуси</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Powder Metallurgy Institute of the National Academy of Sciences of Belarus</institution><country>Belarus</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>14</day><month>04</month><year>2023</year></pub-date><volume>26</volume><issue>1</issue><fpage>5</fpage><lpage>16</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Гурский А.Л., Каланда Н.А., Ярмолич М.В., Петров А.В., Киреев П.Н., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Гурский А.Л., Каланда Н.А., Ярмолич М.В., Петров А.В., Киреев П.Н.</copyright-holder><copyright-holder xml:lang="en">Gurskii A.L., Kalanda N.A., Yarmolich M.V., Petrov A.V., Kireev P.N.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://met.misis.ru/jour/article/view/506">https://met.misis.ru/jour/article/view/506</self-uri><abstract><p>На основании данных термогравиметрического анализа рассчитаны значения кислородного индекса (3–δ) в манганите состава La0,7Sr0,3Mn0,9Fe0,1O3-δ, полученного методом твердофазных реакций. При анализе кривых сорбции-десорбции кислорода установлено, что процессы выделения и поглощения кислорода при парциальном давлении pO2 = 10 Па и 400 Па не являются обратимыми. Минимумы производной dδ/dt = f(T), соответствующие максимумам скорости выделения кислорода, свидетельствуют о сложном характере изменения скорости десорбции кислорода из манганита. Уменьшение скорости нагрева и охлаждения от 6,6 до 2,6 К/мин привело к существенному изменению значения ∆δ, что указывает на зависимость подвижности анионов от концентрации кислорода в структуре магнетика. Установлено, что в манганите La0,7Sr0,3Mn0,9Fe0,1O3-δ кинетика десорбции кислорода хорошо описывается экспоненциальной зависимостью по модели Крамерса, которая подразумевает отсутствие возвращения десорбированного кислорода в образец. Данная модель указывает на нестационарность диффузионного потока через барьер при десорбции кислорода из образцов. Проведенный расчет энергии активации десорбции кислорода методом Мержанова при различных парциальных давлениях кислорода показал, что на начальном этапе выделения кислорода из La0,7Sr0,3Mn0,9Fe0,1O3-δ энергия активации десорбции кислорода имеет минимальное значение (Еа = 103,7 кДж/моль при δ = 0,005) и по мере увеличения концентрации кислородных вакансий она увеличивается с выходом на насыщение (Еа = 134,3 кДж/моль при δ = 0,06). Сделано предположение, что с увеличением концентрации кислородных вакансий происходит взаимодействие между ними с последующим протеканием процессов их упорядочения с образованием ассоциатов.</p></abstract><trans-abstract xml:lang="en"><p>Based on the data of thermogravimetric analysis the values of the oxygen index (3–δ) in the manganite of the La0.7Sr0.3Mn0.9Fe0.1O3-δ composition, obtained by solid-phase reaction technique, have been calculated. The analysis of oxygen sorption-desorption curves showed that the processes of oxygen release and absorption at pO2 = 10 Pa and pO2 = 400 Pa are not reversible. The minima of the derivative dδ/dt = f(T) corresponding to the maxima of the oxygen extraction rate indicate the complex character of changes in the oxygen desorption rate from manganite. The decrease in the heating and cooling rate from 6.6 to 2.6 K/min resulted in a significant change in the value ∆δ, indicating the dependence of anion mobility on the oxygen concentration in the magnet structure. It has been revealed that in the La0.7Sr0.3Mn0.9Fe0.1O3-δ manganite the oxygen desorption kinetics is well described by the exponential dependence on the Cramers model, which implies no return of desorbed oxygen to the sample. This model indicates the non-stationarity of the diffusion flux through the barrier during desorption of oxygen from samples. The calculation of the activation energy of oxygen desorption by the Merzhanov method at various partial pressures of oxygen has shown that at the initial stage of oxygen extraction from La0.7Sr0.3Mn0.9Fe0.1O3-δ, the activation energy of oxygen desorption has a minimum value (Еа = 103.7 kJ/mol at δ = 0.005) and as the concentration of oxygen vacancies increases, it rises reaching saturation (Еа = 134.3 kJ/mol at δ = 0.06). It is assumed that with an increase in the concentration of oxygen vacancies, an interaction occurs between them, followed by the processes of their ordering with the formation of associates.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>легированные манганиты</kwd><kwd>кислородная нестехиометрия</kwd><kwd>термогравиметрический анализ</kwd><kwd>процессы сорбции и десорбции</kwd><kwd>энергия активации</kwd></kwd-group><kwd-group xml:lang="en"><kwd>doped manganites</kwd><kwd>oxygen nonstoichiometry</kwd><kwd>thermogravimetric analysis</kwd><kwd>sorption and desorption processes</kwd><kwd>activation energy</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Авторы работы признательны за поддержку данного исследования в рамках проектов БРФФИ № Ф21ИЗР-004 и № Ф21У-003.</funding-statement><funding-statement xml:lang="en">The authors are grateful for the support of this study within the framework of the BRFFR projects No F21IZR-004 and No. F21U-003.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Goodenough J.B. 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