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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">651957</article-id><article-id pub-id-type="doi">10.31857/S268695352260057X</article-id><article-id pub-id-type="edn">HPDYLH</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 THE Mg<sub>3 –</sub> <sub><italic>n</italic></sub>Ni<sub><italic>n</italic></sub>BPO<sub>7</sub> SYSTEM</article-title><trans-title-group xml:lang="ru"><trans-title>Фазообразование в ряду Mg<sub>3 –</sub> <sub><italic>n</italic></sub>Ni<sub><italic>n</italic></sub>BPO<sub>7</sub></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Smirnova</surname><given-names>M. N.</given-names></name><name xml:lang="ru"><surname>Смирнова</surname><given-names>М. Н.</given-names></name></name-alternatives><email>smirnova_macha1989@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kop’eva</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Копьева</surname><given-names>М. А.</given-names></name></name-alternatives><email>smirnova_macha1989@mail.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>smirnova_macha1989@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nikiforova</surname><given-names>G. E.</given-names></name><name xml:lang="ru"><surname>Никифорова</surname><given-names>Г. Е.</given-names></name></name-alternatives><email>smirnova_macha1989@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Yapryntsev</surname><given-names>A. D.</given-names></name><name xml:lang="ru"><surname>Япрынцев</surname><given-names>А. Д.</given-names></name></name-alternatives><email>smirnova_macha1989@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Arkhipenko</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Архипенко</surname><given-names>А. А.</given-names></name></name-alternatives><email>smirnova_macha1989@mail.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="2023-09-01" publication-format="electronic"><day>01</day><month>09</month><year>2023</year></pub-date><volume>512</volume><issue>1</issue><fpage>95</fpage><lpage>100</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, М.Н. Смирнова, М.А. Копьева, Г.Д. Нипан, Г.Е. Никифорова, А.Д. Япрынцев, А.А. Архипенко</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, М.Н. Смирнова, М.А. Копьева, Г.Д. Нипан, Г.Е. Никифорова, А.Д. Япрынцев, А.А. Архипенко</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">М.Н. Смирнова, М.А. Копьева, Г.Д. Нипан, Г.Е. Никифорова, А.Д. Япрынцев, А.А. Архипенко</copyright-holder><copyright-holder xml:lang="ru">М.Н. Смирнова, М.А. Копьева, Г.Д. Нипан, Г.Е. Никифорова, А.Д. Япрынцев, А.А. Архипенко</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-9535/article/view/651957">https://journals.eco-vector.com/2686-9535/article/view/651957</self-uri><abstract xml:lang="en"><p id="idm45257551641600">Samples of Mg<sub>3 –</sub> <sub><italic>n</italic></sub>Ni<sub><italic>n</italic></sub>BPO<sub>7</sub> (<italic>n</italic> = 0–3), synthesized by gel combustion followed by annealing at 980°C and cooled in the inertial-thermal mode, were studied by X‑ray powder diffraction, infrared spectroscopy, and X-ray fluorescence spectrometry. For the first time, the crystalline phase of Ni<sub>3</sub>BPO<sub>7</sub> with the β-Zn<sub>3</sub>BPO<sub>7</sub> structure has been experimentally obtained. When the composition of the samples changed from Mg<sub>3</sub>BPO<sub>7</sub> to Ni<sub>3</sub>BPO<sub>7</sub>, a region of coexistence of α‑Mg<sub>3</sub>BPO<sub>7</sub> and β-Ni<sub>3</sub>BPO<sub>7</sub> phases was found. An analysis of the diffuse reflectance spectra of the Mg<sub>1.5</sub>Ni<sub>1.5</sub>BPO<sub>7</sub> sample showed the presence of Ni<sup>2+</sup> cations in an arrangement not symmetric octahedral or tetrahedral.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45257551763248">Образцы Mg<sub>3 –</sub> <sub><italic>n</italic></sub>Ni<sub><italic>n</italic></sub>BPO<sub>7</sub> (<italic>n</italic> = 0–3), синтезированные методом сжигания геля с последующим отжигом при 980°C и охлажденные в инерционно-термическом режиме, исследованы методом рентгенофазового анализа, инфракрасной спектроскопии и рентгенофлуоресцентной спектрометрии. Впервые экспериментально получена кристаллическая фаза Ni<sub>3</sub>BPO<sub>7</sub> со структурой β-Zn<sub>3</sub>BPO<sub>7</sub>. При варьировании состава образцов от Mg<sub>3</sub>BPO<sub>7</sub> к Ni<sub>3</sub>BPO<sub>7</sub> в борофосфате обнаружена область совместного существования α‑Mg<sub>3</sub>BPO<sub>7</sub> и β-Ni<sub>3</sub>BPO<sub>7</sub>. Анализ спектров диффузного отражения Mg<sub>1.5</sub>Ni<sub>1.5</sub>BPO<sub>7</sub> показал наличие катионов Ni<sup>2+</sup> в окружении, отличном от симметричного октаэдрического или тетраэдрического окружения.</p></trans-abstract><kwd-group xml:lang="en"><kwd>multicomponent oxide systems</kwd><kwd>phase states</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>многокомпонентные оксидные системы</kwd><kwd>фазовые состояния</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование проводилось с использованием оборудования ЦКП ФМИ ИОНХ РАН.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Zhang J., Han B., Li P., Bian Y., Li J., Shi H. // J. Mater. Sci.—Mater. Electron. 2014. V. 25. № 8. P. 3498–3503. https://doi.org/10.1007/s10854-014-2045-5</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Suzuki T., Hughes M., Ohishi Y. // J. Lumin. 2010. V. 130. № 1. 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