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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">mrisel</journal-id><journal-title-group><journal-title xml:lang="en">Magnetic Resonance in Solids</journal-title><trans-title-group xml:lang="ru"><trans-title>Magnetic Resonance in Solids</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2072-5981</issn><publisher><publisher-name>Kazan Federal University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26907/mrsej-24103</article-id><article-id custom-type="elpub" pub-id-type="custom">mrisel-242</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>Synthesis and study of the cerium doped hydroxyapatite powders</article-title><trans-title-group xml:lang="ru"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Nikitina</surname><given-names>Y. O.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow 119334</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Petrakova</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow 119334</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Maksimenko</surname><given-names>E. I.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow 119334</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Chizhevskaya</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow 125480</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Andreev</surname><given-names>S. M.</given-names></name></name-alternatives><bio xml:lang="en"><p>Peterhof 198504</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Sadovnikova</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan 420008</p></bio><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Murzakhanov</surname><given-names>F. F.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan 420008</p></bio><email xlink:type="simple">murzakhanov.fadis@yandex.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Mamin</surname><given-names>G. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan 420008</p></bio><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Gafurov</surname><given-names>M. R.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan 420008</p></bio><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Komlev</surname><given-names>V. S.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow 119334</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>A.A. Baikov Institute of Metallurgy and Materials Science RAS</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-2"><institution>D. Mendeleyev University of Chemical Technology of Russia</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-3"><institution>St. Petersburg State University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-4"><institution>Kazan Federal University</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>19</day><month>04</month><year>2023</year></pub-date><volume>26</volume><issue>1</issue><issue-title>SPECIAL ISSUE dedicated to Boris I. Kochelaev's 90th birthday</issue-title><elocation-id>24103 (11 pp.)</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Nikitina Y.O., Petrakova N.V., Maksimenko E.I., Chizhevskaya S.V., Andreev S.M., Sadovnikova M.A., Murzakhanov F.F., Mamin G.V., Gafurov M.R., Komlev V.S., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Nikitina Y.O., Petrakova N.V., Maksimenko E.I., Chizhevskaya S.V., Andreev S.M., Sadovnikova M.A., Murzakhanov F.F., Mamin G.V., Gafurov M.R., Komlev V.S.</copyright-holder><copyright-holder xml:lang="en">Nikitina Y.O., Petrakova N.V., Maksimenko E.I., Chizhevskaya S.V., Andreev S.M., Sadovnikova M.A., Murzakhanov F.F., Mamin G.V., Gafurov M.R., Komlev V.S.</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.mrsej.ru/jour/article/view/242">https://www.mrsej.ru/jour/article/view/242</self-uri><abstract><p>Hydroxyapatite (HAp) is an attractive material for creating biocompatible implants owing to its osteoregenerative properties, elemental and phase similarity to bone tissue. The flexible structure of the material allows the introduction of ionic impurities to improve physicochemical and biological characteristics while maintaining the space symmetry group. Rare earth ions are a new step in improving compounds to create luminescent bioimaging agent for application in diagnostics imaging medicine. Nanosized powder of HAp doped with cerium ions (Ce-HAp) was obtained in order to study the impurity localization and its oxidizing state with conventional and pulsed electron paramagnetic resonance (EPR) at X-band. Undoped and doped HAp powders were synthesized via precipitation technique. It was revealed, that Ce-HAp powders after synthesis and heating exhibit luminescence in visible wavelength range (380 and 420 nm) that confirms the presence of Ce3+ in HAp structure. Heating of Ce-HAp in the air atmosphere results in formation of CeO2 with low intensity of luminescence. EPR spectra of the doped sample confirms the Ce3+ incorporation into HAp structure. The powder-like EPR lineshape for the obtained powders can be simulated with g∥ = 3.47 and g⊥ = 0.51.</p></abstract><kwd-group xml:lang="en"><kwd>electron paramagnetic resonance</kwd><kwd>electron spin echo</kwd><kwd>hydroxyapatite</kwd><kwd>rare earth element</kwd><kwd>photoluminescence</kwd></kwd-group><funding-group><funding-statement xml:lang="en">Authors acknowledge the Russian Science Foundation Grant No. 23-23-00640 for financial support of this study.</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">Roberts T. T., Rosenbaum A. J., Organogenesis 8, 114 (2012).</mixed-citation><mixed-citation xml:lang="en">Roberts T. T., Rosenbaum A. 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