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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">Doklady Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Химия, науки о материалах</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-9535</issn><issn publication-format="electronic">3034-5111</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">695816</article-id><article-id pub-id-type="doi">10.7868/S3034511125040062</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>PHYSICAL CHEMISTRY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ФИЗИЧЕСКАЯ ХИМИЯ</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">The Effect of Cryochemical Synthesis Parameters of Iron Oxide Nanoparticles on Their Size, Structure and Magnetic Properties</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние условий криохимического синтеза наночастиц оксидов железа на их размерно-структурные и магнитные параметры</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shumilkin</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Шумилкин</surname><given-names>А. С.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Vernaya</surname><given-names>O. I.</given-names></name><name xml:lang="ru"><surname>Верная</surname><given-names>О. И.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shabatina</surname><given-names>T. I.</given-names></name><name xml:lang="ru"><surname>Шабатина</surname><given-names>Т. И.</given-names></name></name-alternatives><email>tatyanashabatina@yandex.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shabatin</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Шабатин</surname><given-names>А. В.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ovchenkov</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Овченков</surname><given-names>Е. А.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pankratov</surname><given-names>D. A.</given-names></name><name xml:lang="ru"><surname>Панкратов</surname><given-names>Д. А.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff5"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Melnikov</surname><given-names>M. Ya.</given-names></name><name xml:lang="ru"><surname>Мельников</surname><given-names>М. Я.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University, Chemical Department, 119234 Moscow, Russian Federation</institution></aff><aff><institution xml:lang="ru">Московский государственный университет имени М.В. Ломоносова, химический факультет, 119234 Москва, Россия</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Bauman Moscow State Technical University, 105005 Moscow, Russian Federation</institution></aff><aff><institution xml:lang="ru">Московский государственный технический университет им. Н.Э. Баумана, 105005 Москва, Россия</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">The Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, 119071 Moscow, Russian Federation</institution></aff><aff><institution xml:lang="ru">Институт физической химии и электрохимии им. А.Н. Фрумкина Российской академии наук, 119071 Москва, Россия</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Lomonosov Moscow State University, Physical Department, 119234 Moscow, Russian Federation</institution></aff><aff><institution xml:lang="ru">Московский государственный университет имени М.В. Ломоносова, физический факультет, 119234 Москва, Россия</institution></aff></aff-alternatives><aff-alternatives id="aff5"><aff><institution xml:lang="en">Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russian Federation</institution></aff><aff><institution xml:lang="ru">Московский физико-технический институт, 141700 Долгопрудный, Россия</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-08-15" publication-format="electronic"><day>15</day><month>08</month><year>2025</year></pub-date><volume>523</volume><issue>1</issue><issue-title xml:lang="en">VOL 523, NO (2025)</issue-title><issue-title xml:lang="ru">ТОМ 523, № (2025)</issue-title><fpage>50</fpage><lpage>60</lpage><history><date date-type="received" iso-8601-date="2025-11-05"><day>05</day><month>11</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2025-08-15"/></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-9535/article/view/695816">https://journals.eco-vector.com/2686-9535/article/view/695816</self-uri><abstract xml:lang="en"><p>In this work, cryochemical approaches are used to obtain nanoparticles of magnetic iron oxides of various compositions and morphologies. Cryochemical coprecipitation of iron(II) and (III) salts with an ammonia solution in the temperature range from –30 to –50°C leads to the formation of single-domain superparamagnetic maghemite nanoparticles with an average size of 6 ± 2 nm, which is smaller than the average particle size (20 ± 2 nm) obtained by the classical coprecipitation method. However, cryochemical coprecipitation leads to the formation of goethite impurity. Single-domain superparamagnetic magnetite nanoparticles with an average diameter of 10 ± 2 nm without goethite impurity can be obtained by cryochemical precipitation of iron(II) sulfate with ammonia in air. Thermal decomposition of cryomodified iron salts allows obtaining maghemite nanoparticles of 40–300 nm in size in the case of iron(III) acetylacetonate and iron(III) formate, as well as micron-sized maghemite and goethite particles of complex shape in the case of iron(III) ammonium citrate and iron(II) gluconate.</p></abstract><trans-abstract xml:lang="ru"><p>Криохимические подходы использованы для получения наночастиц магнитных оксидов железа различного состава и морфологии. Криохимическое соосаждение солей железа(II) и (III) раствором аммиака в интервале температур от –30 до –50°С приводит к формированию однодоменных суперпарамагнитных наночастиц маггемита со средним размером 6 ± 2 нм, что ниже среднего размера частиц (20 ± 2 нм), получаемых методом классического соосаждения. Однако криохимическое соосаждение приводит к образованию примеси гётита. Однодоменные суперпарамагнитные наночастицы магнетита со средним диаметром 10 ± 2 нм без примеси гётита могут быть получены криохимическим осаждением сульфата железа(II) аммиаком на воздухе. Термическое разложение криомодифицированных солей железа позволяет получить наночастицы маггемита размером 40–300 нм в случае ацетилацетоната железа(III) и формиата железа(III), а также микронные частицы маггемита и гётита сложной формы в случае аммоний цитрата железа(III) и глюконата железа(II).</p></trans-abstract><kwd-group xml:lang="en"><kwd>cryochemical synthesis</kwd><kwd>single-domain magnetic nanoparticles</kwd><kwd>maghemite</kwd><kwd>magnetite</kwd><kwd>iron salts</kwd><kwd>cryoprecipitation</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>криохимический синтез</kwd><kwd>однодоменные магнитные наночастицы</kwd><kwd>маггемит</kwd><kwd>магнетит</kwd><kwd>соли железа</kwd><kwd>криоосаждение</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работы по криохимическому синтезу выполнены по теме № АААА-А21-121011590090-7 государственного задания МГУ имени М.В. Ломоносова. 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