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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">Siberian Aerospace Journal</journal-id><journal-title-group><journal-title xml:lang="en">Siberian Aerospace Journal</journal-title><trans-title-group xml:lang="kk"><trans-title>Siberian Aerospace Journal</trans-title></trans-title-group><trans-title-group xml:lang="pt"><trans-title>Siberian Aerospace Journal</trans-title></trans-title-group><trans-title-group xml:lang="ru"><trans-title>Сибирский аэрокосмический журнал</trans-title></trans-title-group><trans-title-group xml:lang="zh"><trans-title>Siberian Aerospace Journal</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2712-8970</issn><issn publication-format="electronic">2782-5760</issn><publisher><publisher-name xml:lang="en">Reshetnev Siberian State University of Science and Technology</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">716124</article-id><article-id pub-id-type="doi">10.31772/2712-8970-2026-27-2-354-372</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Section 3. Technological Processes and Materials</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Раздел 3. Технологические процессы и материалы</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">The influence of pH on the formation of microstructure and electrochemical characteristics of solid electrolytes 5 YSZ</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние pH на формирование микроструктуры и электрохимические характеристики твердых электролитов 5 YSZ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7754-0011</contrib-id><name-alternatives><name xml:lang="en"><surname>Fedorov</surname><given-names>Leonid Yu.</given-names></name><name xml:lang="ru"><surname>Федоров</surname><given-names>Леонид Юрьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Researcher</p></bio><bio xml:lang="ru"><p>научный сотрудник</p></bio><email>lfedorov@sfu-kras.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-1299-5998</contrib-id><name-alternatives><name xml:lang="en"><surname>Loginov</surname><given-names>Yuri Yu.</given-names></name><name xml:lang="ru"><surname>Логинов</surname><given-names>Юрий Юрьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. Sc., Professor</p></bio><bio xml:lang="ru"><p>доктор физико-математических наук, профессор</p></bio><email>loginov@sibsau.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6951-8025</contrib-id><name-alternatives><name xml:lang="en"><surname>Karpov</surname><given-names>Igor V.</given-names></name><name xml:lang="ru"><surname>Карпов</surname><given-names>Игорь Васильевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sc., Associate Professor, Head of the UNESCO Chair “New Materials and Technologies”</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент, заведующий кафедрой ЮНЕСКО «Новые материалы и технологии»</p></bio><email>ikarpov@sfu-kras.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>Pavlov</surname><given-names>Aleksandr V.</given-names></name><name xml:lang="ru"><surname>Павлов</surname><given-names>Александр Викторович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sc., Senior Lecturer in the Department of Composite Materials and Physical Chemistry of Metallurgical Processes</p></bio><bio xml:lang="ru"><p>кандидат технических наук, старший преподаватель кафедры композиционных материалов и физико-химии металлургических процессов</p></bio><email>tech_ceramica@krtz.su</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4677-6210</contrib-id><name-alternatives><name xml:lang="en"><surname>Mozzherin</surname><given-names>Aleksandr V.</given-names></name><name xml:lang="ru"><surname>Мозжерин</surname><given-names>Александр Владимирович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sc., Associate Professor in the UNESCO Chair “New Materials and Technologies”</p></bio><bio xml:lang="ru"><p>кандидат физико-математических наук, доцент кафедры ЮНЕСКО «Новые материалы и технологии»</p></bio><email>amozzherin@sfu-kras.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Siberian Federal University</institution></aff><aff><institution xml:lang="ru">Сибирский федеральный университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Federal Research Center “Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences”</institution></aff><aff><institution xml:lang="ru">Федеральный исследовательский центр «Красноярский научный центр Сибирского отделения Российской академии наук»</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Reshetnev Siberian State University of Science and Technology</institution></aff><aff><institution xml:lang="ru">Сибирский государственный университет науки и технологий имени академика М. Ф. Решетнева</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-07-06" publication-format="electronic"><day>06</day><month>07</month><year>2026</year></pub-date><volume>27</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>354</fpage><lpage>372</lpage><history><date date-type="received" iso-8601-date="2026-07-06"><day>06</day><month>07</month><year>2026</year></date><date date-type="accepted" iso-8601-date="2026-07-06"><day>06</day><month>07</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Fedorov L.Y., Loginov Y.Y., Karpov I.V., Pavlov A.V., Mozzherin A.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Федоров Л.Ю., Логинов Ю.Ю., Карпов И.В., Павлов А.В., Мозжерин А.В.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Fedorov L.Y., Loginov Y.Y., Karpov I.V., Pavlov A.V., Mozzherin A.V.</copyright-holder><copyright-holder xml:lang="ru">Федоров Л.Ю., Логинов Ю.Ю., Карпов И.В., Павлов А.В., Мозжерин А.В.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/2712-8970/article/view/716124">https://journals.eco-vector.com/2712-8970/article/view/716124</self-uri><abstract xml:lang="en"><p>This paper examines how precipitation pH affects the phase stability, microstructure, and electrochemical characteristics of solid electrolytes based on zirconia stabilized with 5 mol.% yttria (5 YSZ), which we synthesized by chemical coprecipitation. We obtained precursors under three pH conditions (acidic pH &lt; 2, near-neutral pH = 3–7, and alkaline pH &gt; 10) using nitrate salts and NH<sub>4</sub>OH as a precipitant. We characterized the products by SEM, X-ray diffraction, Raman, and IR spectroscopy, as well as DC conductivity measurements. The results demonstrate that precipitation pH critically determines the homogeneity of Y<sup>3+</sup> ion distribution in the precursor. Acidic conditions hinder yttrium coprecipitation, resulting in pronounced segregation of the elements and a high content of the monoclinic phase after calcination and milling. Alkaline conditions ensure quantitative precipitation but cause partial compositional fluctuations and severe agglomeration, so they necessitate intensive milling, which induces lattice deformations and phase transformations. Near-neutral conditions (pH 5–6) promote homogeneous coprecipitation of Zr<sup>4+</sup> and Y<sup>3+</sup> ions, forming precursors with a uniform element distribution and weakly agglomerated particles. This homogeneity ensures the complete removal of coordinated hydroxyl groups during heat treatment, maintaining a high concentration of oxygen vacancies and the stability of the tetragonal phase. Ceramics that we sintered from powder obtained under neutral conditions achieve relative density (98.7%) and ionic conductivity (36.4 mS/cm at 850 °C). Solid oxide electrolytes based on stabilized zirconium dioxide function widely as materials for parameter control sensors (oxygen sensors in propulsion systems) and also serve as the basis for the creation of solid oxide fuel cells.</p></abstract><trans-abstract xml:lang="ru"><p>В работе исследовано влияние pH осаждения на фазовую стабильность, микроструктуру и электрохимические характеристики твердых электролитов на основе диоксида циркония, стабилизированного 5 мол.% оксида иттрия (5 YSZ), синтезированных методом химического соосаждения. Прекурсоры были получены при трех режимах pH (кислом pH &lt; 2, близком к нейтральному pH = 3–7 и щелочном pH &gt; 10) с использованием нитратных солей и NH<sub>4</sub>OH в качестве осадителя. Продукты исследовали методами СЭМ, РФА, рамановской и ИК-спектроскопии, измерения проводимости на постоянном токе. Результаты показывают, что pH осаждения критически определяет гомогенность распределения ионов Y<sup>3+</sup> в прекурсоре. Кислые условия препятствуют соосаждению иттрия, что приводит к выраженной сегрегации элементов и высокому содержанию моноклинной фазы после прокаливания и измельчения. Щелочные условия обеспечивают количественное осаждение, но вызывают частичные флуктуации состава и сильную агломерацию, что требует интенсивного измельчения, которое индуцирует деформации решетки и фазовые превращения. Условия, близкие к нейтральным (pH 5–6), способствуют гомогенному соосаждению ионов Zr<sup>4+</sup> и Y<sup>3+</sup>, формируя прекурсоры с равномерным распределением элементов и слабоагломерированными частицами. Такая гомогенность обеспечивает полное удаление координированных гидроксильных групп в процессе термообработки, сохраняя высокую концентрацию кислородных вакансий и стабильность тетрагональной фазы. Керамика, спеченная из порошка, полученного в нейтральных условиях, достигает значений относительной плотности (98,7 %) и ионной проводимости (36,4 мСм/см при 850 °C). Твердые оксидные электролиты на основе стабилизированного диоксида циркония находят широкое применение в качестве функциональных материалов для датчиков контроля параметров (кислородные датчики в двигательных установках), а также являются основой для создания твердооксидных топливных элементов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>zirconium dioxide</kwd><kwd>chemical precipitation</kwd><kwd>microstructure</kwd><kwd>phase composition</kwd><kwd>ionic conductivity</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>диоксид циркония</kwd><kwd>химическое осаждение</kwd><kwd>микроструктура</kwd><kwd>фазовый состав</kwd><kwd>ионная проводимость</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Government of the Russian Federation</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Правительство Российской Федерации</institution></institution-wrap></funding-source><award-id>FSRZ-2026-0005</award-id></award-group><funding-statement xml:lang="en">The work was carried out within the framework of state assignment FSRZ-2026-0005.</funding-statement><funding-statement xml:lang="ru">Работа выполнена в рамках госзадания FSRZ-2026-0005.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Agarkov D., Borik M., Komarov B., Korableva G., Kulebyakin A., Kuritsyna I., Lomonova E., Milovich F., Myzina V., Tabachkova N. 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