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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">powder</journal-id><journal-title-group><journal-title xml:lang="ru">Известия вузов. Порошковая металлургия и функциональные покрытия</journal-title><trans-title-group xml:lang="en"><trans-title>Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya)</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1997-308X</issn><issn pub-type="epub">2412-8767</issn><publisher><publisher-name>НИТУ "МИСИС"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/1997-308X-2023-3-6-13</article-id><article-id custom-type="elpub" pub-id-type="custom">powder-822</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>Процессы получения и свойства порошков</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Production Processes and Properties of Powders</subject></subj-group></article-categories><title-group><article-title>Естественное и термостимулированное старение наноразмерных порошков феррошпинели кобальта</article-title><trans-title-group xml:lang="en"><trans-title>Natural and thermally stimulated aging of nanosized powders of cobalt ferrospinel</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0716-8685</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Невмывака</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Nevmyvaka</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Анна Алексеевна Невмывака – к.х.н., старший научный сотрудник</p><p>634055, Россия, г. Томск, Академический пр-т, 10/4</p></bio><bio xml:lang="en"><p>Anna A. Nevmyvaka – Cand. Sci. (Chem.), Senior Research Scientist</p><p>10/4 Akademicheskii Prosp., Tomsk 634055, Russia</p></bio><email xlink:type="simple">kaa151@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6097-9965</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Журавлев</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhuravlev</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Виктор Алексеевич Журавлев – к.ф.-м.н., доцент кафедры радиоэлектроники</p><p>634050, Россия, г. Томск, Ленина пр-т, 36</p></bio><bio xml:lang="en"><p>Viktor A. Zhuravlev – Cand. Sci. (Phys.-Math.), Assistant Professor of the Department of Radioelectronics</p><p>36 Lenina Prosp., Tomsk 634050, Russia</p></bio><email xlink:type="simple">ptica@mail.tsu.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0002-5248-0360</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Итин</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Itin</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Воля Исаевич Итин – к.ф.-м.н., ведущий научный сотрудник</p><p>634055, Россия, г. Томск, Академический пр-т, 10/4</p></bio><bio xml:lang="en"><p>Volya I. Itin – Cand. Sci. (Phys.-Math.), Leading Researcher</p><p>10/4 Akademicheskii Prosp., Tomsk 634055, Russia</p></bio><email xlink:type="simple">galitina@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Томский научный центр Сибирского отделения Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Tomsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Научно-исследовательский Томский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National University Tomsk State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>19</day><month>09</month><year>2023</year></pub-date><volume>17</volume><issue>3</issue><fpage>6</fpage><lpage>13</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; НИТУ "МИСИС", 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">НИТУ "МИСИС"</copyright-holder><copyright-holder xml:lang="en">НИТУ "МИСИС"</copyright-holder><license xlink:href="https://powder.misis.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://powder.misis.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://powder.misis.ru/jour/article/view/822">https://powder.misis.ru/jour/article/view/822</self-uri><abstract><p>Методом механохимического синтеза получены наноразмерные порошки кобальтовой феррошпинели со средним размером частиц в интервале 3–15 нм. Элементный состав нанопорошков, исследованный методом рентгеновского флуоресцентного анализа, нестехиометрический и соответствует формуле Co0,7±0,05Fe2,3±0,05O4 . При времени механохимического синтеза 25 мин и выше содержание шпинельной фазы достигает 90 об. %, в образцах также присутствуют фазы гематита, бета-модификации гидроксида железа и рентгеноаморфной фазы. В результате естественного старения при комнатной температуре фазовый состав нанопорошков существенно меняется: увеличивается содержание шпинельной фазы, а гематита и аморфной фазы уменьшается в несколько раз. Также заметно возрастают намагниченность насыщения и эффективное поле анизотропии нанопорошков кобальтовой феррошпинели. Таким образом, термостимулированное старение порошков существенно ускоряет процессы изменения фазового состава, структурных параметров и магнитных свойств и увеличивает степень превращения при образовании феррошпинели кобальта.</p></abstract><trans-abstract xml:lang="en"><p>This article presents the production of nanosized powders of cobalt ferrospinel through mechanochemical synthesis, resulting in an average particle size ranging from 3 to 15 nm. The elemental composition of the nanopowders, analyzed using X-ray fluorescent analysis, is found to be nonstoichiometric and can be represented by the formula: Co0.7±0.05Fe2.3±0.05O4 . When the duration of mechano­chemical synthesis exceeds 25 min, the spinel phase constitutes approximately 90 vol. % in the samples. Additionally, the samples contain hematite phases, the beta modification of iron hydroxide, and an X-ray amorphous phase. Natural aging at room temperature leads to significant changes in the phase composition of the nanopowders. Specifically, there is an increase in the content of spinel phase, while the content of hematite and the amorphous phase decrease significantly. Furthermore, the saturation magnetization and effective field of anisotropy of the cobalt ferrospinel nanopowders exhibit noticeable increments. Consequently, thermal aging of the powders accelerates the changes in phase composition, structural parameters, and magnetic properties, as well as enhances the transformation extent during the formation of cobalt ferrospinel.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>механохимический синтез</kwd><kwd>кобальтовая феррошпинель</kwd><kwd>нанопорошки</kwd><kwd>естественное старение</kwd><kwd>термическое старение</kwd><kwd>магнитная анизотропия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>mechanochemical synthesis</kwd><kwd>cobalt ferrospinel</kwd><kwd>nanopowders</kwd><kwd>natural aging</kwd><kwd>thermally stimulated aging</kwd><kwd>magnetic anisotropy</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке Программы повышения конкурентоспособности ТГУ («Приоритет-2030) и Министерства науки и высшего образования Российской Федерации (проект № 121031800148-5).</funding-statement><funding-statement xml:lang="en">The research was supported by the TSU Competitiveness Improvement Program (“Priority-2030”) and the Ministry of Science and Higher Education of the Russian Federation under project № 121031800148-5.</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">Болдырев B.B. 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