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Phys.: Condens. Matter"],"published-print":{"date-parts":[[2026,10,2]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Diffuse reflectance spectroscopy was used to study undoped and Sm-doped CeO\n                    <jats:sub>2<\/jats:sub>\n                    nanoparticles prepared by sol\u2013gel and ball-milling routes, and to probe radiation damage induced by swift heavy ions. Kubelka\u2013Munk analysis of UV\u2013vis\u2013NIR spectra reveals nine Sm\n                    <jats:sup>3+<\/jats:sup>\n                    4f\u20134f absorption bands within the wide O 2p\u2013Ce 4f band gap, with intensities that increase with Sm content and remain broad owing to low local symmetry and native disorder. Under 946 MeV Au irradiation up to 5 \u00d7 10\n                    <jats:sup>12<\/jats:sup>\n                    cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    , ball-milled Sm-doped samples exhibit a systematic fluence-dependent decrease of Sm\n                    <jats:sup>3+<\/jats:sup>\n                    band intensities, without significant changes in bandwidth or peak positions, indicating that irradiation primarily weakens the local crystal field rather than altering site multiplicity. In parallel, the Urbach energy of the absorption edge increases, providing an optical measure of disorder build-up and yielding approximate damage cross sections consistent with electronically driven track formation. A weak Ce\n                    <jats:sup>3+<\/jats:sup>\n                    4f\u20135 d band near 15 000 cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    appears in irradiated undoped CeO\n                    <jats:sub>2<\/jats:sub>\n                    but is absent in Sm-doped samples, in agreement with oxygen-potential pinning by charge-compensating vacancies. Overall, the data indicate that Sm\n                    <jats:sup>3+<\/jats:sup>\n                    absorption bands are sensitive optical probes of irradiation-induced disorder in nanocrystalline ceria and highlight the utility of rare-earth dopants for tracking radiation damage in fluorite-type oxide nanoparticles.\n                  <\/jats:p>","DOI":"10.1088\/1361-648x\/aea66f","type":"journal-article","created":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T11:10:46Z","timestamp":1790593846000},"page":"395301","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Correlation between Sm\n                    <sup>3+<\/sup>\n                    optical absorption and disorder build-up in swift heavy ion-irradiated CeO\n                    <sub>2<\/sub>\n                    nanoparticles"],"prefix":"10.1088","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8674-9682","authenticated-orcid":true,"given":"Jean-Marc","family":"Costantini","sequence":"first","affiliation":[{"name":"Universit\u00e9 Paris-Saclay, CEA, Service de Recherche en Mat\u00e9riaux et proc\u00e9d\u00e9s Avanc\u00e9s"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"}]},{"given":"G\u00e9rald","family":"Lelong","sequence":"additional","affiliation":[{"name":"Institut de Mine\u00e9ralogie, de Physique des Mate\u00e9riaux et Cosmochimie (IMPMC), Sorbonne Universite\u00e9s\u2212UPMC Univ Paris 06, UMR CNRS 7590, Muse\u00e9um National d\u2019Histoire Naturelle"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"data-curation","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"}]},{"given":"Maxime","family":"Guillaumet","sequence":"additional","affiliation":[{"name":"Institut de Mine\u00e9ralogie, de Physique des Mate\u00e9riaux et Cosmochimie (IMPMC), Sorbonne Universite\u00e9s\u2212UPMC Univ Paris 06, UMR CNRS 7590, Muse\u00e9um National d\u2019Histoire Naturelle"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"data-curation","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"software","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6909-0716","authenticated-orcid":true,"given":"Gianguido","family":"Baldinozzi","sequence":"additional","affiliation":[{"name":"CNRS-Centrale Sup\u00e9lec, Universit\u00e9 Paris-Saclay"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8184-6651","authenticated-orcid":true,"given":"Abdelali","family":"Zaki","sequence":"additional","affiliation":[{"name":"CNRS-Centrale Sup\u00e9lec, Universit\u00e9 Paris-Saclay"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3422-2459","authenticated-orcid":false,"given":"Maik","family":"Lang","sequence":"additional","affiliation":[{"name":"University of Tennessee"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]}],"member":"266","published-online":{"date-parts":[[2026,9,28]]},"reference":[{"key":"cmaea66fbib1","doi-asserted-by":"publisher","first-page":"526","DOI":"10.3389\/fchem.2018.00526","type":"journal-article","article-title":"Rare earth doped ceria: the complex connection between structure and properties","volume":"6","author":"Coduri","year":"2018","journal-title":"Front. 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