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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">690769</article-id><article-id pub-id-type="doi">10.31857/S0044457X25080111</article-id><article-id pub-id-type="edn">jjqvhw</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>ФИЗИКО-ХИМИЧЕСКИЙ АНАЛИЗ НЕОРГАНИЧЕСКИХ СИСТЕМ</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">SYNTHESIS AND THERMODYNAMIC INVESTIGATIONS OF COMPOUND ON THE BASIS OF BISMUTH AND ITTERBIUM OXIDES</article-title><trans-title-group xml:lang="ru"><trans-title>СИНТЕЗ И ТЕРМОДИНАМИЧЕСКИЕ ИССЛЕДОВАНИЯ СОЕДИНЕНИЯ НА ОСНОВЕ ОКСИДОВ ВИСМУТА И ИТТЕРБИЯ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Matskevich</surname><given-names>N. I.</given-names></name><name xml:lang="ru"><surname>Мацкевич</surname><given-names>Н. И.</given-names></name></name-alternatives><email>nata.matskevich@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Elbaev</surname><given-names>E. R.</given-names></name><name xml:lang="ru"><surname>Елбаев</surname><given-names>Е. Р.</given-names></name></name-alternatives><email>nata.matskevich@yandex.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>Semerikova</surname><given-names>A. N.</given-names></name><name xml:lang="ru"><surname>Семерикова</surname><given-names>А. Н.</given-names></name></name-alternatives><email>nata.matskevich@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Manakov</surname><given-names>A. Y.</given-names></name><name xml:lang="ru"><surname>Манаков</surname><given-names>А. Ю.</given-names></name></name-alternatives><email>nata.matskevich@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Levchenko</surname><given-names>L. M.</given-names></name><name xml:lang="ru"><surname>Левченко</surname><given-names>Л. М.</given-names></name></name-alternatives><email>nata.matskevich@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shapovalova</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Шаповалова</surname><given-names>А. А.</given-names></name></name-alternatives><email>nata.matskevich@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zaitsev</surname><given-names>V. P.</given-names></name><name xml:lang="ru"><surname>Зайцев</surname><given-names>В. П.</given-names></name></name-alternatives><email>nata.matskevich@yandex.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tkachev</surname><given-names>E. N.</given-names></name><name xml:lang="ru"><surname>Ткачев</surname><given-names>Е. Н.</given-names></name></name-alternatives><email>nata.matskevich@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Nikolaev Institute of Inorganic Chemistry SB RAS</institution></aff><aff><institution xml:lang="ru">Институт неорганической химии им. А.В. Николаева СО РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Novosibirsk State Technical University</institution></aff><aff><institution xml:lang="ru">Новосибирский государственный технический университет</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Siberian State University of Water Transport</institution></aff><aff><institution xml:lang="ru">Сибирский государственный университет водного транспорта</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>1076</fpage><lpage>1080</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/690769">https://transsyst.ru/0044-457X/article/view/690769</self-uri><abstract xml:lang="en"><p>In the paper, compound with composition Bi<sub>1.3</sub>Yb<sub>0.7</sub>O<sub>3</sub> was prepared by solid state reactions. It was shown that compound had cubic structure, space group Fm3m, lattice parameter a = 0.54202 nm. The dissolution enthalpy of compound Bi<sub>1.3</sub>Yb<sub>0.7</sub>O<sub>3</sub> was measured by solution calorimetry in 2 M HCl and was ∆<sub>sol</sub>H<sup>0</sup> = −227.8 ± 6.3 kJ mol<sup>−</sup><sup>1</sup>. Based on measured enthalpy of dissolution, the standard formation enthalpy of Bi<sub>1.3</sub>Yb<sub>0.7</sub>O<sub>3</sub> was calculated as following value: ∆<sub>f</sub>H<sup>0</sup> = −996.0 ± 7.9 kJ mol<sup> </sup><sup>−</sup><sup>1</sup>. Using Born-Haber cycle, the lattice enthalpy for Bi<sub>1.3</sub>Yb<sub>0.7</sub>O<sub>3</sub> was calculated: ∆<sub>lat</sub>H<sup>0</sup> = −13278 kJ mol<sup>−</sup><sup>1</sup>.</p></abstract><trans-abstract xml:lang="ru"><p>Методом твердофазного синтеза получено соединение Bi<sub>1.3</sub>Yb<sub>0.7</sub>O<sub>3</sub>. Показано, что оно имеет кубическую структуру, пр. гр. Fm3m, параметр решетки a = 0.54202 нм. Энтальпия растворения Bi<sub>1.3</sub>Yb<sub>0.7</sub>O<sub>3</sub> измерена методом калориметрии растворения в 2 M HCl и составила ∆<sub>sol</sub>H<sup>0 </sup>= −227.8 ± 6.3 кДж/моль. На основании полученной энтальпии растворения определена стандартная энтальпия образования Bi<sub>1.3</sub>Yb<sub>0.7</sub>O<sub>3</sub>: ∆<sub>f</sub>H<sup>0</sup> = −996.0 ± 7.9 кДж/моль. С помощью цикла Борна–Габера рассчитана энтальпия решетки для Bi<sub>1.3</sub>Yb<sub>0.7</sub>O<sub>3</sub>, которая составила ∆<sub>lat</sub>H<sup>0</sup> = −13278 кДж/моль.</p></trans-abstract><kwd-group xml:lang="en"><kwd>bismuth oxide</kwd><kwd>ytterbium oxide</kwd><kwd>erbium oxide</kwd><kwd>formation enthalpy</kwd><kwd>lattice enthalpy</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>оксид висмута</kwd><kwd>оксид иттербия</kwd><kwd>энтальпия образования</kwd><kwd>энтальпия решетки</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Kaimieva O.S., Mikhailovskaya Z.A., Buyanova E.S. et al. // Russ. J. Inorg. Chem. 2023. V. 68. P. 386. https://doi.org/10.1134/S0036023623600235</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Tran T.B., Navrotsky A. // Chem. Mater. 2012. V. 24. 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