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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 custom-type="elpub" pub-id-type="custom">najo-1149</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Ca3(PO4)4 polymorphism</article-title><trans-title-group xml:lang="ru"><trans-title>Полиморфизм Ca3(PO4)2</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>Евдокимов</surname><given-names>П. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Evdokimov</surname><given-names>P. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><email xlink:type="simple">pavel.evdokimov@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>Путляев</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Putlyaev</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мерзлов</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Merzlov</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шаталова</surname><given-names>Т. Б .</given-names></name><name name-style="western" xml:lang="en"><surname>Shatalova</surname><given-names>T. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сафронова</surname><given-names>Т. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Safronova</surname><given-names>T. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Климашина</surname><given-names>Е. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Klimashina</surname><given-names>E. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чурагулов</surname><given-names>Б. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Churagulov</surname><given-names>B. R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский государственный университет имени М.В. Ломоносова, Факультет наук о материалах</institution></aff><aff xml:lang="en"><institution>M.V. Lomonosov Moscow State University, Department of Materials Sciencet</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Московский государственный университет имени М.В. Ломоносова, Факультет наук о материалах; Химический факультет</institution></aff><aff xml:lang="en"><institution>M.V. Lomonosov Moscow State University, Department of Materials Sciencet; Chemistry departmen</institution></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Московский государственный университет имени М.В. Ломоносова, Химический факультет</institution></aff><aff xml:lang="en"><institution>M.V. Lomonosov Moscow State University, Chemistry departmen</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2013</year></pub-date><pub-date pub-type="epub"><day>29</day><month>08</month><year>2025</year></pub-date><volume>4</volume><issue>1</issue><fpage>48</fpage><lpage>53</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Evdokimov P.V., Putlyaev V.I., Merzlov D.A., Shatalova T.B., Safronova T.V., Klimashina E.S., Churagulov B.R., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Евдокимов П.В., Путляев В.И., Мерзлов Д.А., Шаталова Т.Б., Сафронова Т.В., Климашина Е.С., Чурагулов Б.Р.</copyright-holder><copyright-holder xml:lang="en">Evdokimov P.V., Putlyaev V.I., Merzlov D.A., Shatalova T.B., Safronova T.V., Klimashina E.S., Churagulov B.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/1149">https://nanojournal.ifmo.ru/jour/article/view/1149</self-uri><abstract><p>The present article is devoted to the β → α phase transformation of Са3(РО4). This phase transformation is low-rate, first-order reconstructive transition, so α−Ca3(PO4)2 can be obtained in the course of low-rate cooling (ca. 5˚С/min). Transformation α → α’ is a high-rate, first-order deformation phase transition; such a fact indicates that α’−Ca3(PO4)2 cannot be obtained even by quenching.</p></abstract><trans-abstract xml:lang="ru"><p>Показано, что переход β → α в Са3(РО4) является заторможенным реконструктивным переходом 1-го рода, что позволяет получить высокотемпературную α−Ca3(PO4)2 при охлаждении со скоростями порядка 5˚С/мин. Переход α → α’ относится к быстрым деформационным переходам 1-го рода, что исключает возможность получения α’-Ca3(PO4)2 даже при высоких скоростях охлаждения, в том числе при закалке.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>трикальциевый фосфат</kwd><kwd>полиморфизм</kwd><kwd>реконструктивный фазовый переход</kwd><kwd>деформационный фазовый переход</kwd><kwd>переход 1-го рода</kwd></kwd-group><kwd-group xml:lang="en"><kwd>tricalcium phosphate</kwd><kwd>polymorphism</kwd><kwd>reconstructive phase transition</kwd><kwd>deformation phase transition</kwd><kwd>first-order transition</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена с использованием оборудования, приобретённого за счет средств Программы развития Московского университета. Проведенные исследования поддержаны грантами РФФИ 10-03-00866, 11-03-12179-офи-м-2011, 12-03-01025, 12-08-00681.</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">Doremus R.H. Review: Bioceramics // Journal of Materials Science. — 1992. — V. 27. — P. 285–297.</mixed-citation><mixed-citation xml:lang="en">Doremus R.H. Review: Bioceramics // Journal of Materials Science. — 1992. — V. 27. — P. 285–297.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Hench L.L. Bioceramics. Journal of the American Ceramic Society. — 1998. — V. 81,№ 7. — P. 1705–1728.</mixed-citation><mixed-citation xml:lang="en">Hench L.L. Bioceramics. 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