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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Vestnik of the Far East Branch of the Russian Academy of Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Vestnik of the Far East Branch of the Russian Academy of Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Дальневосточного отделения Российской академии наук</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-7698</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">676046</article-id><article-id pub-id-type="doi">10.31857/S0869769824010087</article-id><article-id pub-id-type="edn">legujg</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Chemical Sciences. Advanced materials</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Химические науки. Перспективные материалы</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">CoF<sub>2</sub>/C/CF/PTFE nanocomposite synthesized in plasma, nanodispersed Co<sub>3</sub>O<sub>4</sub> obtained from it and their magnetic properties</article-title><trans-title-group xml:lang="ru"><trans-title>Синтезированный в плазме нанокомпозит CoF<sub>2</sub>/C/CF/PTFE, полученный из него нанодисперсный Co<sub>3</sub>O<sub>4</sub> и их магнитные свойства</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7129-8129</contrib-id><name-alternatives><name xml:lang="en"><surname>Kuryavyi</surname><given-names>Valeriy G.</given-names></name><name xml:lang="ru"><surname>Курявый</surname><given-names>Валерий Георгиевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Candidate of Sciences in Chemistry, Senior Researcher</p></bio><bio xml:lang="ru"><p>кандидат химических наук, старший научный сотрудник</p></bio><email>kvg@ich.dvo.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1770-1546</contrib-id><name-alternatives><name xml:lang="en"><surname>Tkachenko</surname><given-names>Ivan I.</given-names></name><name xml:lang="ru"><surname>Ткаченко</surname><given-names>Иван Анатольевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Candidate of Sciences in Chemistry, Senior Researcher</p></bio><bio xml:lang="ru"><p>кандидат химических наук, старший научный сотрудник</p></bio><email>tkachenko@ich.dvo.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3945-9121</contrib-id><name-alternatives><name xml:lang="en"><surname>Zverev</surname><given-names>Grigoriy A.</given-names></name><name xml:lang="ru"><surname>Зверев</surname><given-names>Григорий Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Candidate of Sciences in Chemistry, Researcher</p></bio><bio xml:lang="ru"><p>кандидат химических наук, научный сотрудник</p></bio><email>zverev@ich.dvo.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4562-017X</contrib-id><name-alternatives><name xml:lang="en"><surname>Ustinov</surname><given-names>Aleksandr Y.</given-names></name><name xml:lang="ru"><surname>Устинов</surname><given-names>Александр Юрьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Doctor of Sciences in Physics and Mathematics, Professor</p></bio><bio xml:lang="ru"><p>доктор физико-математических наук, профессор</p></bio><email>all_vl@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Chemistry, FEB RAS</institution></aff><aff><institution xml:lang="ru">Институт химии ДВО РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-02-15" publication-format="electronic"><day>15</day><month>02</month><year>2024</year></pub-date><issue>1</issue><issue-title xml:lang="ru"/><fpage>113</fpage><lpage>125</lpage><history><date date-type="received" iso-8601-date="2025-02-28"><day>28</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-7698/article/view/676046">https://journals.eco-vector.com/0869-7698/article/view/676046</self-uri><abstract xml:lang="en"><p>The CoF<sub>2</sub>/C/CF/PTFE nanocomposite was synthesized in the plasma of a pulsed high-voltage discharge. CoF<sub>2</sub> nanoparticles are distributed in two size ranges ~20–100 nm and ~3–10 nm. After calcining the composite, the nanodispersed powder was obtained consisting of Co<sub>3</sub>O<sub>4</sub> nanoparticles with the same particle size distribution. SQUID magnetometry was used to study the temperature and field dependences of the magnetization of the samples in the range of 300–2 K. On the graphs of temperature dependences, for both types of samples, at two different temperatures, peak-like changes occur, attributed to the transitions of CoF<sub>2</sub> or Co<sub>3</sub>O<sub>4</sub> nanoparticles, with decreasing temperature, in antiferromagnetic state. The transition temperature T<sub>N</sub> was estimated from the peak maxima. The existence of two transition temperatures is explained by size effects, taking into account the distribution of particle sizes in two different ranges. At temperatures below T<sub>N</sub>, a shift of the magnetic hysteresis loops to the region of negative fields was found, which is due to the AFM/FM interaction between the core and shell of nanoparticles. For both types of samples, there is a hysteresis in the temperature dependences of FC and ZFC. The manifestation of hysteresis can be explained in the general case by the presence of the metastable state formed in an external magnetic field during the interaction of the magnetic moments of nanoparticles, in this case, arising due to the uncompensated spins on their surface. It is concluded that the effect of particle size on the shift of the transition temperature to the AFM state is more significant in CoF<sub>2</sub> nanoparticles than in Co<sub>3</sub>O<sub>4</sub> nanoparticles.</p></abstract><trans-abstract xml:lang="ru"><p>В плазме импульсного высоковольтного разряда синтезирован нанокомпозит CoF<sub>2</sub>/C/CF/PTFE. Наночастицы CoF<sub>2</sub> распределены в двух размерных диапазонах ~20–100 нм и ~3–10 нм. После прокаливания композита получен нанодисперсный порошок, состоящий из наночастиц Co<sub>3</sub>O<sub>4</sub>, с таким же распределением частиц по их размерам. Методом СКВИД<bold> </bold>магнитометрии изучены температурные и полевые зависимости намагниченности образцов в диапазоне 300–2 K. На графиках температурных зависимостей для обоих типов образцов при двух различных температурах происходят пикообразные изменения, отнесенные к переходам наночастиц CoF<sub>2</sub> или Co<sub>3</sub>O<sub>4</sub> при понижении температуры в антиферромагнитное состояние. По максимумам пиков оценивалась температура перехода T<sub>N</sub>. Существование двух температур перехода объясняется размерными эффектами, с учетом распределения размеров частиц в двух различных диапазонах. При температурах ниже T<sub>N</sub> обнаружено смещение петель магнитного гистерезиса в область отрицательных полей, обусловленное АФМ/ФМ взаимодействием ядра и оболочки наночастиц. Для обоих типов образцов имеет место гистерезис<bold> </bold>температурных зависимостей FC и ZFC. Проявление гистерезиса может быть объяснено в общем случае наличием метастабильного состояния, формирующегося во внешнем магнитном поле при взаимодействии магнитных моментов наночастиц, в данном случае возникающих из-за нескомпенсированности спинов на их поверхности. Сделан вывод, что влияние размеров частиц на величину сдвига температуры перехода в АФМ состояние более значительно в наночастицах CoF<sub>2</sub>,<sub> </sub>чем в наночастицах Co<sub>3</sub>O<sub>4</sub>.</p></trans-abstract><kwd-group xml:lang="en"><kwd>plasma chemistry</kwd><kwd>PTFE</kwd><kwd>nanoparticles</kwd><kwd>CoF2</kwd><kwd>Co3O4</kwd><kwd>magnetization</kwd><kwd>phase transitions</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>плазмохимия</kwd><kwd>ПТФЭ</kwd><kwd>наночастицы</kwd><kwd>CoF2</kwd><kwd>Co3O4</kwd><kwd>намагниченность</kwd><kwd>фазовые переходы</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work was carried out within the framework of the state task of the Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences, topic N0205-2022-0003.</funding-statement><funding-statement xml:lang="ru">Работа выполнена в рамках государственного задания Института химии ДВО РАН, тема № 0205-2022-0003.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Kuryavyi V. 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