Non-invasive rayleigh, raman, and chromium-fluorescence study of phase transitions: β-alumina into γ-alumina ‘Single’ crystal and then to α-alumina

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dc.contributor.authorRedonnet, Juliette
dc.contributor.authorŞimşek-Franci, Gülsu
dc.contributor.authorColomban, Philippe
dc.date.accessioned2025-11-10T11:27:18Z
dc.date.available2025-11-10T11:27:18Z
dc.date.issued2025
dc.departmentFakülteler, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü
dc.description.abstractIn many advanced materials production processes, the analysis must be non-invasive, rapid, and, if possible, operando. The Raman signal of the various forms of alumina, especially transition alumina, is very weak due to the highly ionic nature of the Al-O bond, which requires long exposure times that are incompatible with monitoring transitions. Here, we explore the use of the fluorescence signal of chromium, a natural impurity in alumina, and the Rayleigh wing to follow the crystallization process up to alpha alumina. To clarify the assignment of the fluorescence components, we compare the transformation of beta alumina single crystals into transition (gamma and theta) alumina and then into alpha alumina with the transformation of optically transparent alumina xerogel and glass, obtained by very slow hydrolysis-polycondensation of aluminum sec-butoxide, into alpha alumina. Vibrational modes are better resolved in thermally treated single crystals than in thermally treated xerogels. Measurements of the Rayleigh wing, the Boson peak, and the fluorescence signal are easier than those of vibrational modes for studying the evolution from amorphous to alpha alumina phases. The fluorescence spectra allow almost instantaneous (<1 s) quantitative control of the phases present.
dc.description.sponsorshipSaint-Gobain Research Province, Cavaillon, France
dc.identifier.doi10.3390/ma18204682
dc.identifier.issn1996-1944
dc.identifier.issue20
dc.identifier.pmid41156913
dc.identifier.scopus2-s2.0-105020206128
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.3390/ma18204682
dc.identifier.urihttps://hdl.handle.net/11501/2503
dc.identifier.volume18
dc.identifier.wosWOS:001603852900001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakScopus
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakPubMed
dc.institutionauthorŞimşek-Franci, Gülsu
dc.institutionauthorid0000-0001-9050-5819
dc.language.isoen
dc.publisherMultidisciplinary Digital Publishing Institute (MDPI)
dc.relation.ispartofMaterials
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectAmorphous Alumina
dc.subjectBeta Alumina
dc.subjectChromium
dc.subjectCorundum
dc.subjectFluorescence
dc.subjectGamma Alumina
dc.subjectGel
dc.subjectGlass
dc.subjectRaman Spectroscopy
dc.subjectSingle Crystal
dc.subjectTheta Alumina
dc.subjectTransition Alumina
dc.subjectXRD
dc.titleNon-invasive rayleigh, raman, and chromium-fluorescence study of phase transitions: β-alumina into γ-alumina ‘Single’ crystal and then to α-alumina
dc.typeArticle

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