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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">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">665284</article-id><article-id pub-id-type="doi">10.31857/S0044457X22601869</article-id><article-id pub-id-type="edn">JEWBVV</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>Unknown</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Microwave-Assisted Hydrothermal Synthesis of Ceric-Ammonium Phosphates (NH4)2Ce(PO4)2⋅H2O and NH4Ce2(PO4)3</article-title><trans-title-group xml:lang="ru"><trans-title>Гидротермально-микроволновой синтез ортофосфатов церия(IV)-аммония (NH<sub>4</sub>)<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2</sub> ⋅ H<sub>2</sub>O и NH<sub>4</sub>Ce<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tronev</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Тронев</surname><given-names>И. В.</given-names></name></name-alternatives><email>van@igic.ras.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>Sheichenko</surname><given-names>E. D.</given-names></name><name xml:lang="ru"><surname>Шейченко</surname><given-names>Е. Д.</given-names></name></name-alternatives><email>van@igic.ras.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>Razvorotneva</surname><given-names>L. S.</given-names></name><name xml:lang="ru"><surname>Разворотнева</surname><given-names>Л. С.</given-names></name></name-alternatives><email>van@igic.ras.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>Trufanova</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Труфанова</surname><given-names>Э. А.</given-names></name></name-alternatives><email>van@igic.ras.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>Minakova</surname><given-names>P. V.</given-names></name><name xml:lang="ru"><surname>Минакова</surname><given-names>П. В.</given-names></name></name-alternatives><email>van@igic.ras.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>Kozlova</surname><given-names>T. O.</given-names></name><name xml:lang="ru"><surname>Козлова</surname><given-names>Т. О.</given-names></name></name-alternatives><email>van@igic.ras.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Baranchikov</surname><given-names>A. E.</given-names></name><name xml:lang="ru"><surname>Баранчиков</surname><given-names>А. Е.</given-names></name></name-alternatives><email>van@igic.ras.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ivanov</surname><given-names>V. K.</given-names></name><name xml:lang="ru"><surname>Иванов</surname><given-names>В. К.</given-names></name></name-alternatives><email>van@igic.ras.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт общей и неорганической химии им. Н.С. Курнакова РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">National Research University Higher School of Economics</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский университет “Высшая школа экономики”</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-03-01" publication-format="electronic"><day>01</day><month>03</month><year>2023</year></pub-date><volume>68</volume><issue>3</issue><fpage>318</fpage><lpage>324</lpage><history><date date-type="received" iso-8601-date="2025-02-26"><day>26</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, И.В. Тронев, Е.Д. Шейченко, Л.С. Разворотнева, Э.А. Труфанова, П.В. Минакова, Т.О. Козлова, А.Е. Баранчиков, В.К. Иванов</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, И.В. Тронев, Е.Д. Шейченко, Л.С. Разворотнева, Э.А. Труфанова, П.В. Минакова, Т.О. Козлова, А.Е. Баранчиков, В.К. Иванов</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">И.В. Тронев, Е.Д. Шейченко, Л.С. Разворотнева, Э.А. Труфанова, П.В. Минакова, Т.О. Козлова, А.Е. Баранчиков, В.К. Иванов</copyright-holder><copyright-holder xml:lang="ru">И.В. Тронев, Е.Д. Шейченко, Л.С. Разворотнева, Э.А. Труфанова, П.В. Минакова, Т.О. Козлова, А.Е. Баранчиков, В.К. Иванов</copyright-holder></permissions><self-uri xlink:href="https://transsyst.ru/0044-457X/article/view/665284">https://transsyst.ru/0044-457X/article/view/665284</self-uri><abstract xml:lang="en"><p>The possibility of preparation of crystalline double cerium(IV) phosphates (NH4)2Ce(PO4)2⋅H2O and NH4Ce2(PO4)3 under the conditions of microwave-assisted hydrothermal synthesis has been analyzed. It has been shown that these phosphates in a single-phase state can be obtained in the temperature range of 130–190°С with a synthesis duration of ≥5 min, while the phase composition of the synthesis products is determined by the molar ratio of ammonia and phosphoric acid in the reaction mixture. Short-term (5 min) low-temperature (130°С) hydrothermal synthesis under microwave heating leads to the preparation of (NH4)2Ce(PO4)2⋅H2O and NH4Ce2(PO4)3 with a particle size of ~70 and ~200 nm, respectively. At higher temperatures and treatment times (190°C and 24 h), the particle size of these phases increases to ~200 and ~500 nm, respectively. For the first time, the value of the optical band gap for (NH4)2Ce(PO4)2⋅H2O was determined to be 2.8 and 3.1 eV for indirect and direct transitions, respectively.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181324448016">Проанализирована возможность получения кристаллических двойных ортофосфатов церия(IV) (NH<sub>4</sub>)<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2</sub> ⋅ H<sub>2</sub>O и NH<sub>4</sub>Ce<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> в условиях гидротермального синтеза с одновременной микроволновой обработкой. Показано, что указанные ортофосфаты в однофазном состоянии могут быть получены в диапазоне температур 130–190°С при продолжительности синтеза ≥5 мин, при этом фазовый состав продуктов синтеза определяется мольным соотношением аммиака и ортофосфорной кислоты в реакционной смеси. Кратковременный (5 мин) низкотемпературный (130°С) гидротермальный синтез в условиях микроволнового воздействия приводит к получению (NH<sub>4</sub>)<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2</sub> ⋅ H<sub>2</sub>O и NH<sub>4</sub>Ce<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> с размером частиц ~70 и ~200 нм соответственно. При более высоких температуре и продолжительности обработки (190°С и 24 ч) размер частиц указанных фаз увеличивается до ~200 и ~500 нм соответственно. Впервые определено значение оптической ширины запрещенной зоны для (NH<sub>4</sub>)<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2</sub> ⋅ H<sub>2</sub>O, составившее 2.8–3.1 эВ для непрямого и прямого переходов соответственно.</p></trans-abstract><kwd-group xml:lang="en"><kwd>phosphates</kwd><kwd>REE</kwd><kwd>cerium</kwd><kwd>hydrothermal treatment</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>фосфаты</kwd><kwd>РЗЭ</kwd><kwd>церий</kwd><kwd>гидротермальная обработка</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Публикация подготовлена в ходе работы (№ проекта 22-00-015 “Композиционные ионопроводящие мембраны на основе фосфатов церия(IV)”) в рамках Программы “Научный фонд Национального исследовательского университета “Высшая школа экономики” (НИУ ВШЭ)”.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Nazaraly M., Wallez G., Chanéac C. et al. // Angew. Chem. Int. Ed. 2005. V. 44. 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