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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="other" 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">651945</article-id><article-id pub-id-type="doi">10.31857/S2686953523700267</article-id><article-id pub-id-type="edn">BITRQF</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></subject></subj-group></article-categories><title-group><article-title xml:lang="en">CONCENTRATION TETRAHEDRON OF THE Li–Mn–Eu–O SYSTEM</article-title><trans-title-group xml:lang="ru"><trans-title>Концентрационный тетраэдр системы Li–Mn–Eu–O</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Buzanov</surname><given-names>G. A.</given-names></name><name xml:lang="ru"><surname>Бузанов</surname><given-names>Г. А.</given-names></name></name-alternatives><email>gbuzanov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nipan</surname><given-names>G. D.</given-names></name><name xml:lang="ru"><surname>Нипан</surname><given-names>Г. Д.</given-names></name></name-alternatives><email>gbuzanov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт общей и неорганической химии им. Н.С. Курнакова Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-11-01" publication-format="electronic"><day>01</day><month>11</month><year>2023</year></pub-date><volume>513</volume><issue>1</issue><fpage>145</fpage><lpage>148</lpage><history><date date-type="received" iso-8601-date="2025-02-02"><day>02</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Г.А. Бузанов, Г.Д. Нипан</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Г.А. Бузанов, Г.Д. Нипан</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Г.А. Бузанов, Г.Д. Нипан</copyright-holder><copyright-holder xml:lang="ru">Г.А. Бузанов, Г.Д. Нипан</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-9535/article/view/651945">https://journals.eco-vector.com/2686-9535/article/view/651945</self-uri><abstract xml:lang="en"><p id="idm45257550354320">Based on fragmentary experimental data, an isothermal concentration tetrahedron of the Li–Mn–Eu–O system was constructed for the first time by the method of topological modeling, which describes possible solid-state transformations in the system occurring at a constant temperature with a change in pressure. Thirty-two equilibria involving four crystalline phases have been identified.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45257550354016">Методом топологического моделирования на основе фрагментарных экспериментальных данных впервые построен изотермический концентрационный тетраэдр системы Li–Mn–Eu–O, описывающий возможные твердофазные превращения в системе, происходящие при постоянной температуре с изменением давления. Выделены тридцать два равновесия с участием четырех кристаллических фаз.</p></trans-abstract><kwd-group xml:lang="en"><kwd>phase equilibria</kwd><kwd>multicomponent oxide systems</kwd><kwd>phase diagrams</kwd><kwd>spinel</kwd><kwd>lithium ion batteries</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>фазовые равновесия</kwd><kwd>оксидные многокомпонентные системы</kwd><kwd>фазовые диаграммы</kwd><kwd>шпинель</kwd><kwd>литиевые аккумуляторы</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Thackeray M.M., Amine K. // Nat. Energy. 2021. V. 6. P. 933. https://doi.org/10.1038/s41560-021-00860-3</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Ram P., Gören A., Ferdov S., Silva M., Singha R., Costa C.M., Carlos M., Sharma R.K., Lanceros-Méndez S. // New J. Chem. 2016. V. 40. № 7. 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