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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">651936</article-id><article-id pub-id-type="doi">10.31857/S2686953523700255</article-id><article-id pub-id-type="edn">BIUMSJ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>CHEMISTRY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ХИМИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">PHASE FORMATION IN ALKALINE TITANOSILICATE SYSTEMS DURING HYDROTHERMAL SYNTHESIS</article-title><trans-title-group xml:lang="ru"><trans-title>Фазообразование в щелочных титаносиликатных системах при гидротермальном синтезе</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gerasimova</surname><given-names>L. G.</given-names></name><name xml:lang="ru"><surname>Герасимова</surname><given-names>Л. Г.</given-names></name></name-alternatives><email>l.gerasimova@ksc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shchukina</surname><given-names>E. S.</given-names></name><name xml:lang="ru"><surname>Щукина</surname><given-names>Е. С.</given-names></name></name-alternatives><email>l.gerasimova@ksc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Maslova</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Маслова</surname><given-names>М. В.</given-names></name></name-alternatives><email>l.gerasimova@ksc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nikolaev</surname><given-names>A. I.</given-names></name><name xml:lang="ru"><surname>Николаев</surname><given-names>А. И.</given-names></name></name-alternatives><email>l.gerasimova@ksc.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Tananaev Institute of Chemistry – Subdivision of the Federal Research Centre “Kola Science Centre of the Russian Academy of Sciences”, Science Centre of Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт химии и технологии редких элементов 
и минерального сырья им. И.В. Тананаева – обособленное подразделение ФИЦ КНЦ 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>86</fpage><lpage>92</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, Л.Г. Герасимова, Е.С. Щукина, М.В. Маслова, А.И. Николаев</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Л.Г. Герасимова, Е.С. Щукина, М.В. Маслова, А.И. Николаев</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Л.Г. Герасимова, Е.С. Щукина, М.В. Маслова, А.И. Николаев</copyright-holder><copyright-holder xml:lang="ru">Л.Г. Герасимова, Е.С. Щукина, М.В. Маслова, А.И. Николаев</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-9535/article/view/651936">https://journals.eco-vector.com/2686-9535/article/view/651936</self-uri><abstract xml:lang="en"><p id="idm45257550240816">The investigations in the polycomponent high alkaline systems – TiO<sub>2</sub>–H<sub>2</sub>SO<sub>4</sub>–Na<sub>2</sub>SiO<sub>3</sub>–NaOH–H<sub>2</sub>O and TiO<sub>2</sub>–H<sub>2</sub>SO<sub>4</sub>–(NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>–Na<sub>2</sub>SiO<sub>3</sub>–NaOH–H<sub>2</sub>O under hydrothermal synthesis conditions have been carried out to provide new products with the given technical properties. It has been shown that by directed selection of structure-forming components, in particular titanium compounds, together with optimal parameters of hydrothermal treatment of the obtained precursor, it is possible to form compounds with the given phase and chemical composition, morphology and particle size. It was found that the rate of structural transformations during synthesis depends on the phase composition of titanosilicate precursors. During their hydrothermal treatment, alkaline and thermal hydrolysis with subsequent dehydration of hydrolyzed phases of titanium (IV) and silicon take place. The process is accompanied by localization of free bonds providing formation of Ti–O–Si–O-bridges and their subsequent transformation into structured new formations.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45257550240784">Проведены исследования в поликомпонентных высоко щелочных системах – TiO<sub>2</sub>–H<sub>2</sub>SO<sub>4</sub>–Na<sub>2</sub>SiO<sub>3</sub>–NaOH–H<sub>2</sub>O и TiO<sub>2</sub>–H<sub>2</sub>SO<sub>4</sub>–(NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>–Na<sub>2</sub>SiO<sub>3</sub>–NaOH–H<sub>2</sub>O в условиях гидротермального синтеза, обеспечивающего получение новых продуктов с заданными техническими свойствами. Показано, что посредством направленного подбора структурообразующих компонентов, в частности соединений титана, совместно с оптимальными параметрами гидротермальной обработки полученного прекурсора возможно формирование соединений с заданным химическим составом, размером и морфологией частиц. Установлено, что при синтезе скорость структурных преобразований зависит от фазового состава титаносиликатных прекурсоров. При их гидротермальной обработке протекает щелочной и термический гидролиз с последующей дегидратацией гидролизованных фаз титана (IV) и кремния. Это сопровождается локализацией свободных связей, обеспечивающих образование Ti–O–Si–O-мостиков и их последующую трансформацию в структурированные новообразования.</p></trans-abstract><kwd-group xml:lang="en"><kwd>hydrothermal synthesis</kwd><kwd>phase formation</kwd><kwd>crystalline compounds</kwd><kwd>mineral-like titanosilicates</kwd><kwd>morphological properties</kwd><kwd>sorption</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>гидротермальный синтез</kwd><kwd>фазообразование</kwd><kwd>кристаллические соединения</kwd><kwd>минералоподобные титаносиликаты</kwd><kwd>морфологические свойства</kwd><kwd>сорбция</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Yakovenchuk V.N., Krivovichev S.V., Pakhomovsky Y.A., Selivanova E.A., Ivanyuk G.Y. Microporous titanosilicates of the lintisite-kukisvumite group and their transformation in acidic solutions. In: Minerals as advanced materials II. Krivovichev S.V. (Ed.). 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