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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">Russian Journal of Inorganic Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Inorganic Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал неорганической химии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-457X</issn><issn publication-format="electronic">3034-560X</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">690763</article-id><article-id pub-id-type="doi">10.31857/S0044457X25080069</article-id><article-id pub-id-type="edn">jjkljr</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>СИНТЕЗ И СВОЙСТВА НЕОРГАНИЧЕСКИХ СОЕДИНЕНИЙ</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">Microwave-assisted hydrothermal synthesis of α-Mn2O3</article-title><trans-title-group xml:lang="ru"><trans-title>Гидротермально-микроволновый синтез α-Mn2O3</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zakharova</surname><given-names>G. S.</given-names></name><name xml:lang="ru"><surname>Захарова</surname><given-names>Г. С.</given-names></name></name-alternatives><email>volkov@ihim.uran.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Fattakhova</surname><given-names>Z. A.</given-names></name><name xml:lang="ru"><surname>Фаттахова</surname><given-names>З. А.</given-names></name></name-alternatives><email>volkov@ihim.uran.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Solid State Chemistry, Ural Division, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт химии твердого тела УрО РАН</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>70</volume><issue>8</issue><issue-title xml:lang="en">VOL 70, NO8 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 70, №8 (2025)</issue-title><fpage>1031</fpage><lpage>1037</lpage><history><date date-type="received" iso-8601-date="2025-09-21"><day>21</day><month>09</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></permissions><self-uri xlink:href="https://transsyst.ru/0044-457X/article/view/690763">https://transsyst.ru/0044-457X/article/view/690763</self-uri><abstract xml:lang="en"><p>For the first time, α-Mn<sub>2</sub>O<sub>3</sub> of cubic crystal structure was synthesized by microwave-assisted hydrothermal treatment of a reaction mixture containing potassium permanganate and ascorbic acid taken in a molar ratio of 1 : (1–1.5), followed by annealing in air. A possible mechanism for the formation of manganese(III) oxide is proposed. The main physicochemical characteristics of the synthesized α-Mn<sub>2</sub>O<sub>3</sub> are determined using X-ray phase analysis, scanning electron microscopy, and low-temperature nitrogen adsorption. It has been established that by varying the molar ratio of the components of the reaction mass, as well as the annealing conditions of the intermediate products, β-MnO<sub>2</sub>, Mn<sub>3</sub>O<sub>4</sub> and MnO/C, Mn<sub>3</sub>O<sub>4</sub>/C composites can be additionally obtained.</p></abstract><trans-abstract xml:lang="ru"><p>Гидротермально-микроволновой обработкой реакционной смеси, содержащей перманганат калия и аскорбиновую кислоту, взятые в молярном соотношении 1 : (1–1.5), с последующим отжигом на воздухе впервые синтезирован α-Mn<sub>2</sub>O<sub>3</sub> кубической сингонии. Предложен возможный механизм формирования оксида марганца(III). Методами рентгенофазового анализа, сканирующей электронной микроскопии и низкотемпературной адсорбции азота определены основные физико-химические характеристики синтезированного α-Mn<sub>2</sub>O<sub>3</sub>. Установлено, что варьированием молярного соотношения компонентов реакционной массы, а также условий отжига промежуточных продуктов дополнительно могут быть получены β-MnO<sub>2</sub>, Mn<sub>3</sub>O<sub>4</sub> и композиты MnO/C, Mn<sub>3</sub>O<sub>4</sub>/C.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Mn<sub>2</sub>O<sub>3</sub></kwd><kwd>Mn<sub>2</sub>O<sub>3</sub></kwd><kwd>ascorbic acid</kwd><kwd>microwave-assisted hydrothermal synthesis</kwd><kwd>composite</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>аскорбиновая кислота</kwd><kwd>гидротермально-микроволновый синтез</kwd><kwd>композит</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Wang Y., Ye X.-Y., Han G.-Z. // Colloids Surf., A. 2024. V. 682. Р. 132869. https://doi.org/10.1016/j.colsurfa.2023.132869</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Yin X.-T., Wu S.-S., Dastan D. et al. // Surf. Interfaces. 2021. 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