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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">zldm</journal-id><journal-title-group><journal-title xml:lang="ru">Заводская лаборатория. Диагностика материалов</journal-title><trans-title-group xml:lang="en"><trans-title>Industrial laboratory. Diagnostics of materials</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1028-6861</issn><issn pub-type="epub">2588-0187</issn><publisher><publisher-name>ООО «Издательство «ТЕСТ-ЗЛ»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26896/1028-6861-2022-88-7-73-78</article-id><article-id custom-type="elpub" pub-id-type="custom">zldm-1704</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>ИССЛЕДОВАНИЕ СТРУКТУРЫ И СВОЙСТВ. МЕХАНИКА МАТЕРИАЛОВ: ПРОЧНОСТЬ, РЕСУРС, БЕЗОПАСНОСТЬ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>TESTING OF STRUCTURE AND PARAMETERS. MECHANICAL TESTING METHODS</subject></subj-group></article-categories><title-group><article-title>Исследование упругодеформированного состояния тонких алмазных пластин</article-title><trans-title-group xml:lang="en"><trans-title>Study of the elastically deformed state of thin diamond plates</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дигуров</surname><given-names>Р. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Digurov</surname><given-names>R. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Роман Валерьевич Дигуров</p><p>Россия, 108840, Москва, г. Троицк, ул. Центральная, д. 7а</p></bio><bio xml:lang="en"><p>Roman V. Digurov</p><p>7a, Tsentralnaya ul., Troitsk, Moscow, 108840, Russia</p></bio><email xlink:type="simple">roman.digurov@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Терентьев</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Terentyev</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сергей Александрович Терентьев</p><p>Россия, 108840, Москва, г. Троицк, ул. Центральная, д. 7а</p></bio><bio xml:lang="en"><p>Sergey A. Terentyev</p><p>7a, Tsentralnaya ul., Troitsk, Moscow, 108840, Russia</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Федеральное государственное бюджетное научное учреждение «Технологический институт сверхтвердых и новых углеродных материалов»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Federal state budgetary scientific institution «Technological Institute for Superhard and Novel Carbon Materials»</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>21</day><month>07</month><year>2022</year></pub-date><volume>88</volume><issue>7</issue><fpage>73</fpage><lpage>78</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Дигуров Р.В., Терентьев С.А., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Дигуров Р.В., Терентьев С.А.</copyright-holder><copyright-holder xml:lang="en">Digurov R.V., Terentyev S.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://www.zldm.ru/jour/article/view/1704">https://www.zldm.ru/jour/article/view/1704</self-uri><abstract><p>Развитие технологий выращивания в лабораторных условиях монокристаллов алмаза высокого качества, его малое термическое расширение позволяют рассматривать этот материал как перспективный в качестве элементов рентгеновской оптики при создании лазеров на свободных электронах. Востребованы также алмазные кристалл-спектрометры различной толщины и радиуса изгиба. В связи с этим представляют интерес вопросы, касающиеся определения механических параметров упругодеформированных монокристаллов алмаза, в частности, критических напряжений, возникающих при деформации монокристалла, и минимальных радиусов изгиба пластин определенной геометрии. Цель работы — определение упругодеформированного состояния тонких алмазных пластин с параметрами, аналогичными тем, которые требуются в спектрометрах для неинвазивной диагностики спектров X-ray free-electron laser (XFEL). Образцы вырезали из кристалла типа IIa высочайшего качества, выращенного методом температурного градиента. В экспериментах исследовали алмазные пластины с кристаллографическими ориентациями (110) и (111). Получены зависимости напряжений и радиусов изгиба от величины деформации при изгибе тонких алмазных пластин толщиной 20 мкм. Экспериментальные деформации не превысили 1 мм. Определены также предельные (минимальные) радиусы изгиба тонких алмазных пластин: для направления (111) — 5,6 мм, а для направления (110) — 4,5 мм. Модули Юнга составили 1198 ГПа для направления (111) и 1034 ГПа для направления (110). Критические напряжения при изгибе тонких монокристаллов алмаза, при которых наступает их разрушение, превысило 2,4 ГПа. Определена зависимость радиусов изгиба кристаллов от их толщины при напряжении 2,0 ГПа. Результаты исследований позволили рассчитать допустимые деформации для тонких алмазных пластин произвольных формы и толщины. Полученные данные будут способствовать улучшению моделирования и качества производства изогнутых спектрометров.</p></abstract><trans-abstract xml:lang="en"><p>The development of laboratory technologies for growing high-quality diamond single crystals, as well as low thermal expansion of a diamond, make it possible to consider this material promising as an element of X-ray optics in designing free electron lasers (XFEL). Diamond crystal-spectrometers of various thicknesses and bending radii are also in demand. In this regard, the issues regarding the mechanical parameters of elastically deformed diamond single crystals require clarification, among them critical stresses in a deformed single crystal and the minimum bending radii for plates of certain geometry. The goal of the study is determination of the elastically deformed state of thin diamond plates with the parameters required in spectrometers for non-invasive diagnostics of X-ray free-electron laser (XFEL) spectra. The samples were cut from the IIa -type crystal of the highest quality grown by the temperature gradient method. Diamond plates with (110) and (111) crystallographic orientations were used in the experiments. The dependences of the stresses and bending radii on deformation value were obtained during bending thin diamond plates with a thickness of 20 μm. The experimental deformations did not exceed 1 mm. The minimum bending radii of thin diamond plates were also determined: for (111) direction — 5.6 mm, and for (110) direction — 4.5 mm. The Young’s moduli were 1198 GPa for (111) direction and 1034 GPa for (110) direction. Critical stresses during bending of thin diamond single crystals (resulting in their destruction) exceeded 2.4 GPa. The dependence of the bending radii of crystals on their thickness was calculated at a stress value of 2.0 GPa. The results of the study make it possible to calculate the allowable deformations for thin diamond plates of arbitrary shape and thickness. The data obtained will contribute to the improvement of modeling and the quality of production of curved spectrometers.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>кристалл-спектрометр</kwd><kwd>упругодеформированное состояние алмаза</kwd><kwd>минимальный радиус изгиба алмазных пластин</kwd><kwd>продольный модуль Юнга</kwd><kwd>критические напряжения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>crystal spectrometer</kwd><kwd>elastically deformed state of diamond</kwd><kwd>minimum bend radius of diamond plates</kwd><kwd>longitudinal Young’s modulus</kwd><kwd>critical stresses</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Eremets M. I., et al. The strength of diamond / Appl. Phys. Lett. 2005. Vol. 87. N 14. P. 141902. DOI: 10.1063/1.2061853</mixed-citation><mixed-citation xml:lang="en">Eremets M. I., et al. The strength of diamond / Appl. Phys. Lett. 2005. 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