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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">phmath</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник Государственного университета просвещения. Серия: Физика-Математика</journal-title><trans-title-group xml:lang="en"><trans-title>Bulletin of Federal State University of Education. Series: Physics and Mathematics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2949-5083</issn><issn pub-type="epub">2949-5067</issn><publisher><publisher-name>Federal State University of Education</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18384/2310-7251-2020-3-6-12</article-id><article-id custom-type="elpub" pub-id-type="custom">phmath-57</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>ФИЗИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICS</subject></subj-group></article-categories><title-group><article-title>МЕТОД РАСЧЁТА МОДУЛЕЙ ФРАНКА ЖИДКОКРИСТАЛЛИЧЕСКОГО КОМПЛЕКСА НА ОСНОВЕ ЭРБИЯ</article-title><trans-title-group xml:lang="en"><trans-title>ERBIUM-BASED LIQUID CRYSTAL COMPLEX FRANK CONSTANTS CALCULATION METHOD</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>Тамбовцев</surname><given-names>И. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Tambovtcev</surname><given-names>I. M.</given-names></name></name-alternatives><email xlink:type="simple">imtambovtcev@gmail.com</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>Добрун</surname><given-names>Л. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Dobrun</surname><given-names>L. A.</given-names></name></name-alternatives><email xlink:type="simple">l.dobrun@spbu.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>Ковшик</surname><given-names>А. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Kovshik</surname><given-names>A. P.</given-names></name></name-alternatives><email xlink:type="simple">ashakovshik@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>Аксенова</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Aksenova</surname><given-names>E. V.</given-names></name></name-alternatives><email xlink:type="simple">e.aksenova@spbu.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>Рюмцев</surname><given-names>Е. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Ryumtsev</surname><given-names>E. I.</given-names></name></name-alternatives><email xlink:type="simple">rei39@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ryumtsev Saint Petersburg University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>15</day><month>02</month><year>2022</year></pub-date><volume>0</volume><issue>3</issue><fpage>6</fpage><lpage>12</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Тамбовцев И.М., Добрун Л.А., Ковшик А.П., Аксенова Е.В., Рюмцев Е.И., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Тамбовцев И.М., Добрун Л.А., Ковшик А.П., Аксенова Е.В., Рюмцев Е.И.</copyright-holder><copyright-holder xml:lang="en">Tambovtcev I.M., Dobrun L.A., Kovshik A.P., Aksenova E.V., Ryumtsev E.I.</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.physmathmgou.ru/jour/article/view/57">https://www.physmathmgou.ru/jour/article/view/57</self-uri><abstract><p>Цель: определить модули Франка жидкокристаллического комплекса на основе эрбия. Процедура и методы. Ёмкостным методом исследовано ориентирующее влияние магнитного поля на жидкокристаллический комплекс на основе эрбия. Получена зависимость эффективных значений компонент диэлектрической проницаемости комплекса от магнитного поля. Предложен теоретический подход и численный метод определения упругих постоянных Франка на основе экспериментальной зависимости эффективных значений компонент диэлектрической проницаемости от магнитного поля. Результаты. Построены и объяснены зависимости диэлектрической проницаемости образца от приложенного магнитного поля; найдены модули Франка для данного вещества. Теоретическая и практическая значимость. Парамагнитные нематические жидкокристаллические комплексы на основе ионов лантаноидов (лантанидомезогены), обладают высокоэффективной люминесценцией и аномально большой для жидких кристаллов анизотропией магнитной восприимчивости. Указанные свойства нематических лантанидомезогенов позволяют создавать оптические среды с линейно поляризованной люминесценцией для использования в оптоэлектронных устройствах, управляемых с помощью электрических и магнитных полей.</p></abstract><trans-abstract xml:lang="en"><p>Bstract. Aim is to determine the Frank elastic constants of an erbium-based liquid crystal complex. Methodology. The orienting effect of a magnetic field on an erbium-based liquid crystal complex was studied by a capacitive method. The dependence of the effective values of the components of the dielectric permittivity of the complex on the magnetic field is obtained. A theoretical approach and a numerical method for determining the Frank elastic constants are proposed based on the experimental dependence of the effective values of the permittivity of a cell on a magnetic field. Results. The dependences of the permittivity of the sample on the applied magnetic field explained, and Frank elastic constants for this substance are found. Research implications. Paramagnetic nematic liquid crystal complexes based on lanthanide ions (lanthanide mesogens) possess highly efficient luminescence and anisotropy of magnetic susceptibility is anomalously large for liquid crystals. The indicated properties of nematic lanthanide mesogens make it possible to create optical media with linearly polarized luminescence for use in optoelectronic devices controlled by electric and magnetic fields.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>жидкие кристаллы</kwd><kwd>лантанидомезогены</kwd><kwd>диэлектрическая проницаемость</kwd><kwd>модули Франка</kwd><kwd>фазовый переход</kwd><kwd>эффект Фредерикса</kwd></kwd-group><kwd-group xml:lang="en"><kwd>liquid crystals</kwd><kwd>lanthanide mesogens</kwd><kwd>dielectric permittivity</kwd><kwd>Frank elastic constants</kwd><kwd>phase transition</kwd><kwd>Frédericksz transition</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">Enhanced full color tunable luminescent lyotropic liquid crystals from P123 and ionic liquid by doping lanthanide complexes and AIEgen / Lei N, Shen D., Wang X., Wang J., Li Q., Chen X. // Journal of Colloid and Interface Science. 2018. 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