Cr3+ doped Al2O3 obtained by non-hydrolytic sol-gel methodology

dc.contributor.authorCaiut, José M.A.
dc.contributor.authorFloch, Nolwen [UNESP]
dc.contributor.authorMessaddeq, Younès [UNESP]
dc.contributor.authorDe Lima, Omar J.
dc.contributor.authorRocha, Lucas A.
dc.contributor.authorCiuffi, Katia J.
dc.contributor.authorNassar, Eduardo J.
dc.contributor.authorFriedermann, Geraldo R.
dc.contributor.authorRibeiro, Sidney J.L. [UNESP]
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de Franca (UNIFRAN)
dc.contributor.institutionUniversidade Federal do Paraná (UFPR)
dc.date.accessioned2019-10-06T17:17:31Z
dc.date.available2019-10-06T17:17:31Z
dc.date.issued2019-01-01
dc.description.abstractThis paper reports the synthesis and characterization of Cr3+-doped alumina by the sol-gel non-hydrolytic methodology. The resulting sample was treated at different temperatures. X-ray diffraction revealed that the ruby phase emerged in the sample treated at 1100 oC, which was later confirmed by absorption bands correspondent to Cr3+ ions allowed transitions at 4A2 → 4T1 4T2, and forbidden at 4A2 → 2T1 2E, observed by diffuse reflectance UV-Vis. The luminescence spectroscopy showed the intensity band at 694 nm in red region, characterized of the Cr3+ ion. The peaks at 702 and 705 nm correspond to N1 and N2 lines, respectively, which arose from the second and fourth nearest-neighbor exchange-coupled pairs of chromium(III) ion, respectively, ascribed to high chromium(III) concentration. The Cr3+ cluster formation was observed in electron paramagnetic resonance signal as discussed in this work. Nuclear magnetic resonance evidenced that the 27Al symmetry changed in the samples treated between 900 and 1100 oC.en
dc.description.affiliationDepartamento de Química Faculdade de Filosofia Ciências e Letras de Ribeirão Preto (FFCLRP) Universidade de São Paulo (USP)
dc.description.affiliationInstituto de Química Universidade Estadual Paulista (Unesp)
dc.description.affiliationUniversidade de Franca (UNIFRAN)
dc.description.affiliationDepartamento de Química Universidade Federal do Paraná (UFPR)
dc.description.affiliationUnespInstituto de Química Universidade Estadual Paulista (Unesp)
dc.format.extent744-751
dc.identifierhttp://dx.doi.org/10.21577/0103-5053.20180195
dc.identifier.citationJournal of the Brazilian Chemical Society, v. 30, n. 4, p. 744-751, 2019.
dc.identifier.doi10.21577/0103-5053.20180195
dc.identifier.fileS0103-50532019000400744.pdf
dc.identifier.issn1678-4790
dc.identifier.issn0103-5053
dc.identifier.scieloS0103-50532019000400744
dc.identifier.scopus2-s2.0-85070569615
dc.identifier.urihttp://hdl.handle.net/11449/190566
dc.language.isoeng
dc.relation.ispartofJournal of the Brazilian Chemical Society
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectEPR
dc.subjectLuminescence
dc.subjectNMR
dc.subjectRuby
dc.subjectSol-gel
dc.titleCr3+ doped Al2O3 obtained by non-hydrolytic sol-gel methodologyen
dc.typeArtigo

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