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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2220-8054-2026-17-3-304-310</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-1837</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="en"><subject>PHYSICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА</subject></subj-group></article-categories><title-group><article-title>Optical absorption and Raman spectroscopy of HoFe3(BO3)4 ferroborate: experimental study with thermodynamic analysis</article-title><trans-title-group xml:lang="ru"><trans-title>Оптическое поглощение и рамановская спектроскопия ферробората HoFe3(BO3)4: экспериментальное исследование с термодинамическим анализом</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0370-8066</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шарипов</surname><given-names>М.</given-names></name><name name-style="western" xml:lang="en"><surname>Sharipov</surname><given-names>M. Z.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Mirzo Z. Sharipov – Department of Physics.</p><p>Bukhara</p></bio><bio xml:lang="en"><p>Mirzo Z. Sharipov – Department of Physics.</p><p>Bukhara</p></bio><email xlink:type="simple">m.z.sharipov@rambler.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>Низомова</surname><given-names>Ш.</given-names></name><name name-style="western" xml:lang="en"><surname>Nizomova</surname><given-names>Sh. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Shaxnoza K. Nizomova – Department of Physics.</p><p>Uzbekistan</p></bio><bio xml:lang="en"><p>Shaxnoza K. Nizomova – Department of Physics.</p><p>Uzbekistan</p></bio><email xlink:type="simple">shahnozanizomova39@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0058-1733</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Файзиев</surname><given-names>Ш.</given-names></name><name name-style="western" xml:lang="en"><surname>Fayziyev</surname><given-names>Sh. Sh.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Shaxobiddin Sh. Fayziyev – Department of Physics.</p><p>Bukhara</p></bio><bio xml:lang="en"><p>Shaxobiddin Sh. Fayziyev – Department of Physics.</p><p>Bukhara</p></bio><email xlink:type="simple">fayziyev83@mail.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/0000-0002-0099-3175</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Джураев</surname><given-names>Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Dzhuraev</surname><given-names>D. R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Davron R. Dzhuraev – Department of Physics.</p><p>Bukhara</p></bio><bio xml:lang="en"><p>Davron R. Dzhuraev – Department of Physics.</p><p>Bukhara</p></bio><email xlink:type="simple">djuraev2002@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Bukhara State University; Bukhara State Pedagogical Institute</institution><country>Uzbekistan</country></aff><aff xml:lang="en" id="aff-2"><institution>Bukhara State University</institution><country>Uzbekistan</country></aff><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>18</day><month>07</month><year>2026</year></pub-date><volume>17</volume><issue>3</issue><fpage>304</fpage><lpage>310</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Sharipov M.Z., Nizomova S.K., Fayziyev S.S., Dzhuraev D.R., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Шарипов М., Низомова Ш., Файзиев Ш., Джураев Д.</copyright-holder><copyright-holder xml:lang="en">Sharipov M.Z., Nizomova S.K., Fayziyev S.S., Dzhuraev D.R.</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://nanojournal.ifmo.ru/jour/article/view/1837">https://nanojournal.ifmo.ru/jour/article/view/1837</self-uri><abstract><p>The vibrational and optical properties of HoFe3(BO3)4 single crystals have been investigated by Raman spectroscopy and optical absorption measurements. The Raman spectrum, recorded at room temperature, reveals well-defined phonon modes associated with lattice vibrations and internal modes of structural units. Intense bands in the range 1200 – 1450 cm−1 are attributed to internal vibrations of BO3 groups, while features in the 400 – 700 cm−1 region originate from FeO6 octahedra. The optical absorption spectrum measured in the range 190 – 1100 nm exhibits weak narrow bands in the visible and near-infrared regions, corresponding to intra-4f transitions of Ho3+ ions, and a pronounced absorption edge in the ultraviolet region associated with O2− → Fe3+ charge-transfer transitions. The optical band gap is estimated to be 3.3 – 3.5 eV. A correlation between vibrational and optical properties is established, demonstrating the role of BO3 groups and FeO6 octahedra in determining the electronic structure and optical response of the material. The results provide a consistent experimental characterization of HoFe3(BO3)4 and indicate its potential for optical and magneto-optical applications.</p></abstract><trans-abstract xml:lang="ru"><p>Вибрационные и оптические свойства монокристаллов HoFe3(BO3)4 были исследованы с помощью рамановской спектроскопии и измерений оптического поглощения. Рамановский спектр, записанный при комнатной температуре, выявляет четко выраженные фононные моды, связанные с колебаниями решетки и внутренними модами структурных единиц. Интенсивные полосы в диапазоне 1200–1450 см-1 приписываются внутренним колебаниям групп BO3, в то время как особенности в области 400–700 см-1 обусловлены октаэдрами FeO6. Спектр оптического поглощения, измеренный в диапазоне 190–1100 нм, демонстрирует слабые узкие полосы в видимой и ближней инфракрасной областях, соответствующие внутри-4f переходам ионов Ho3+, и выраженный край поглощения в ультрафиолетовой области, связанный с переходами переноса заряда O2⁻ → Fe3+. Оптическая ширина запрещенной зоны оценивается в 3,3–3,5 эВ. Установлена корреляция между колебательными и оптическими свойствами, демонстрирующая роль групп BO3 и октаэдров FeO6 в определении электронной структуры и оптического отклика материала. Результаты обеспечивают согласованную экспериментальную характеристику HoFe3(BO3)4 и указывают на его потенциал для оптических и магнитооптических применений.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>HoFe3(BO3)4</kwd><kwd>ферробораты редкоземельных элементов</kwd><kwd>рамановская спектроскопия</kwd><kwd>оптическое поглощение</kwd><kwd>оптическая ширина запрещенной зоны</kwd><kwd>переходы с переносом заряда</kwd><kwd>электронные переходы 4f</kwd><kwd>колебательные свойства</kwd></kwd-group><kwd-group xml:lang="en"><kwd>HoFe3(BO3)4</kwd><kwd>rare-earth ferroborates</kwd><kwd>Raman spectroscopy</kwd><kwd>optical absorption</kwd><kwd>optical band gap</kwd><kwd>charge-transfer transitions</kwd><kwd>4f electronic transitions</kwd><kwd>vibrational properties</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">Zvezdin A.K., Pyatakov A.P. 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