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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">mateltech</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Материалы электронной техники</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1609-3577</issn><issn pub-type="epub">2413-6387</issn><publisher><publisher-name>MISIS</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/1609-3577j.met202511.661</article-id><article-id custom-type="elpub" pub-id-type="custom">mateltech-661</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Материаловедение и технология. Диэлектрики</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATERIALS SCIENCE AND TECHNOLOGY. DIELECTRICS</subject></subj-group></article-categories><title-group><article-title>О некоторых особенностях свойств и микроструктуры кристаллов иодата лития</article-title><trans-title-group xml:lang="en"><trans-title>On some features of the properties and microstructure of lithium iodate crystals</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3096-2812</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Петраков</surname><given-names>В. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Petrakov</surname><given-names>V. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ленинский просп., д. 4, стр. 1, Москва, 119049</p><p>Петраков Валерий Сергеевич — канд. физ.-мат. наук, доцент кафедры материаловедения полупроводников и диэлектриков</p></bio><bio xml:lang="en"><p>4-1 Leninskiy Ave., Moscow 119049</p><p>Valery S. Petrakov — Cand. Sci. (Phys.-Math.), Associate Professor, Department of Semiconductor and Dielectric Materials Science</p></bio><email xlink:type="simple">petrakov.valery@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0986-4935</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Базалевская</surname><given-names>С. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Bazalevskaya</surname><given-names>S. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ленинский просп., д. 4, стр. 1, Москва, 119049;</p><p>ул. Буженинова, д. 16, стр. 1, Москва, 107023</p><p>Базалевская Светлана Сергеевна — канд. физ.-мат. наук, научный сотрудник, межкафедральная учебно-испытательная лаборатория полупроводниковых материалов и диэлектриков «Монокристаллы и заготовки на их основе» (1); инженер-технолог (2)</p></bio><bio xml:lang="en"><p> 4-1 Leninskiy Ave., Moscow 119049;</p><p>16-1 Buzheninova Str., Moscow 107023</p><p>Svetlana S. Bazalevskaya — Cand. Sci. (Phys.-Math.), Researcher, Laboratory “Single Crystals and Stock on their Base” (1): Process Engineer (2)</p></bio><email xlink:type="simple">svetoch88@bk.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9514-1310</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чичков</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Chichkov</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ленинский просп., д. 4, стр. 1, Москва, 119049</p><p>Чичков Максим Владимирович — инженер научного проекта, лаборатория сверхпроводниковых квантовых технологий</p></bio><bio xml:lang="en"><p>4-1 Leninskiy Ave., Moscow 119049</p><p>Maxim V. Chichkov — Research Project Engineer, Laboratory of Superconducting Quantum Technologies</p></bio><email xlink:type="simple">maxim.chichkov@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1047-3007</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Киселев</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kiselev</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ленинский просп., д. 4, стр. 1, Москва, 119049</p><p>Киселев Дмитрий Александрович — PhD, канд. физ.-мат. наук, зав. кафедрой материаловедения полупроводников и диэлектриков, зав. лабораторией физики оксидных сегнетоэлектриков</p></bio><bio xml:lang="en"><p>4-1 Leninskiy Ave., Moscow 119049</p><p>Dmitry A. Kiselev — PhD, Cand. Sci. (Phys.-Math.), Head of the Department of Semiconductor and Dielectric Materials Science, Head of the Laboratory of Physics of Oxide Ferroelectrics</p></bio><email xlink:type="simple">dm.kiselev@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный исследовательский технологический университет «МИСИС»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National University of Science and Technology “MISIS”</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Национальный исследовательский технологический университет «МИСИС»;&#13;
АО «Фомос-Материалы»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National University of Science and Technology “MISIS”; JSC Fomos-Materials</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>12</day><month>01</month><year>2026</year></pub-date><volume>28</volume><issue>4</issue><elocation-id>661</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Петраков В.С., Базалевская С.С., Чичков М.В., Киселев Д.А., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Петраков В.С., Базалевская С.С., Чичков М.В., Киселев Д.А.</copyright-holder><copyright-holder xml:lang="en">Petrakov V.S., Bazalevskaya S.S., Chichkov M.V., Kiselev D.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://met.misis.ru/jour/article/view/661">https://met.misis.ru/jour/article/view/661</self-uri><abstract><p>Проведено комплексное исследование монокристаллов иодата лития (α-LiIO3), выращенных из маточных растворов методом изотермического испарения. Основное внимание уделено изучению микроструктуры, оптических и механических свойств, а также их анизотропии. Методами селективного химического травления и сканирующей зондовой микроскопии выявлена значительная неоднородность микроструктуры. Показано, что боковой прирост кристалла характеризуется аномально высокой плотностью дефектов (105—107 см-2) и повышенной шероховатостью поверхности (25 нм по сравнению с 2 нм в центральной части), а также сложной зонарной и секториальной структурой. Проведены детальные измерения микротвердости по Кнупу и Виккерсу на различных кристаллографических плоскостях. Обнаружена анизотропия твердости II рода: максимальные значения зафиксированы на пирамидальных гранях {10Ī1} (278—283 кгс/мм²), минимальные — на призматических {10Ī0} (221—248 кгс/мм²). На плоскости Z-среза анизотропия I рода отсутствует. Показано, что микротвердость уменьшается по высоте кристалла, что связано с градиентом концентрации микропримесей, максимальным в начале роста (в районе затравки). На основе анализа микроструктуры и секториального строения предложен механизм хрупкого разрушения кристалла при механическом воздействии (ударе) по границам секторов, обусловленный неоднородностью и скоплением дислокаций. Полученные результаты важны для понимания связи между условиями роста, микроструктурой и механическими свойствами кристаллов LiIO3, что расширяет возможности их практического применения в нелинейно-оптических устройствах и позволяет оптимизировать методы обработки.</p></abstract><trans-abstract xml:lang="en"><p>A comprehensive study of lithium iodate (α-LiIO₃) single crystals grown from mother solutions by the isothermal evaporation method has been conducted. The main focus was on the investigation of the microstructure, optical and mechanical properties, and their anisotropy. Significant microstructural heterogeneity was revealed using methods of selective chemical etching and scanning probe microscopy. It was shown that the lateral crystal growth is characterized by an anomalously high defect density (105–107 cm-2) and increased surface roughness (25 nm compared to 2 nm in the central part), as well as a complex zonal and sectorial structure. Detailed measurements of Knoop and Vickers microhardness on various crystallographic planes were performed. Anisotropy of the second kind was discovered: maximum values were recorded on pyramidal faces {10Ī1} (278–283 kgf/mm2), while minimum values were found on prismatic faces {10Ī0} (221–248 kgf/mm2). No anisotropy of the first kind was observed on the Z-cut plane. It was demonstrated that microhardness decreases along the crystal height, which is associated with a gradient of microimpurity concentration, maximum at the beginning of growth (near the seed). Based on the analysis of the microstructure and sectorial structure, a mechanism of brittle crystal fracture under mechanical impact (shock) along sector boundaries is proposed, caused by heterogeneity and dislocation pile-ups. The obtained results are important for understanding the relationship between growth conditions, microstructure, and mechanical properties of LiIO3 crystals, which expands the possibilities for their practical application in nonlinear optical devices and allows for the optimization of processing methods.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>монокристалл иодата лития</kwd><kwd>оптические свойства</kwd><kwd>механические свойства</kwd><kwd>микроструктура</kwd></kwd-group><kwd-group xml:lang="en"><kwd>lithium iodate single crystal</kwd><kwd>optical properties</kwd><kwd>mechanical properties</kwd><kwd>microstructure</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследования методами сканирующей зондовой микроскопии выполнены при поддержке Министерства науки и высшего образования РФ в рамках государственного задания (проект № FSME-2024-0001).</funding-statement><funding-statement xml:lang="en">The scanning probe microscopy studies were supported by the Russian Ministry of Science and Higher Education under a state assignment (Project No. FSME-2024-0001).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Nikogosyan D.N. 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