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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">Journal of Communications Technology and Electronics</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Communications Technology and Electronics</journal-title><trans-title-group xml:lang="ru"><trans-title>Радиотехника и электроника</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0033-8494</issn><issn publication-format="electronic">3034-5901</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">687493</article-id><article-id pub-id-type="doi">10.31857/S0033849425040052</article-id><article-id pub-id-type="edn">FSODLI</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ON THE 70th ANNIVERSARY OF S.A. NIKITOV</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>К 70-ЛЕТИЮ С.А. НИКИТОВА</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">Phonon transport features in dielectrics with nanostructured inhomogeneities</article-title><trans-title-group xml:lang="ru"><trans-title>Особенности транспорта фононов в диэлектриках с наноструктурными неоднородностями</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nikitov</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Никитов</surname><given-names>С. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>taranov@cplire.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Taranov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Таранов</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>taranov@cplire.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Khazanov</surname><given-names>E. N.</given-names></name><name xml:lang="ru"><surname>Хазанов</surname><given-names>Е. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>taranov@cplire.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Charnaya</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Чарная</surname><given-names>Е. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Physics Department </p></bio><bio xml:lang="ru"><p>Физический факультет<italic> </italic></p></bio><email>taranov@cplire.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shevchenko</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Шевченко</surname><given-names>Е. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Physics Department </p></bio><bio xml:lang="ru"><p>Физический факультет<italic> </italic></p></bio><email>taranov@cplire.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kotelnikov Institute of Radioengineering and Electronics of RAS</institution></aff><aff><institution xml:lang="ru">Институт радиотехники и электроники им. В.А. Котельникова РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">St. Petersburg State University</institution></aff><aff><institution xml:lang="ru">Санкт-Петербургский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2025</year></pub-date><volume>70</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>363</fpage><lpage>369</lpage><history><date date-type="received" iso-8601-date="2025-07-14"><day>14</day><month>07</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-07-14"><day>14</day><month>07</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0033-8494/article/view/687493">https://journals.eco-vector.com/0033-8494/article/view/687493</self-uri><abstract xml:lang="en"><p>The peculiarities of heat capacity and phonon spectrum in single crystals of yttrium-rare earth aluminum garnets solid solutions Y<sub>3</sub><sub>–<italic>x</italic></sub>Re<italic><sub>x</sub></italic>Al<sub>5</sub>O<sub>12</sub> (Re-Ho;Er) prone to clustering are analyzed. It was shown that nanoscale inhomogeneities in single crystals of solid solutions can be responsible for the formation of additional local modes in heat capacity in the low-temperature region.</p></abstract><trans-abstract xml:lang="ru"><p>Проанализированы особенности теплоемкости и фононного спектра в монокристаллах твердых растворов иттрий-редкоземельных алюмогранатов Y<sub>3</sub><sub>–</sub><italic><sub>x</sub></italic>Re<italic><sub>x</sub></italic>Al<sub>5</sub>O<sub>12</sub> (Re-Ho; Er), склонных к кластеризации. Показано, что наномасштабные неоднородности в монокристаллах твердых растворов могут быть ответственны за формирование дополнительных локальных мод в теплоемкости в области низких температур<italic>.</italic></p></trans-abstract><kwd-group xml:lang="en"><kwd>local modes</kwd><kwd>heat capacity</kwd><kwd>nanostructure</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>локальные моды</kwd><kwd>теплоемкость</kwd><kwd>наноструктуры</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Ministry of Science and Higher Education of the Russian Federation</institution></institution-wrap></funding-source><award-id>FFWZ-2025-0001</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Kаминский А.А., Таранов А.В., Хазанов Е.Н., Акчурин М.Ш. // Квантов. электрон. 2012. 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