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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/83720
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dc.creatorEder Luiz Tolentino Juniorpt_BR
dc.creatorCoralie Heinis Diaspt_BR
dc.creatorMario Luiz de Sá Carneiro Chavespt_BR
dc.creatorKlaus Wilhelm Heinrich Krambrockpt_BR
dc.creatorMauricio Veloso Brant Pinheiropt_BR
dc.date.accessioned2025-07-22T12:10:07Z-
dc.date.available2025-07-22T12:10:07Z-
dc.date.issued2019-
dc.citation.volume46pt_BR
dc.citation.spage203pt_BR
dc.citation.epage213pt_BR
dc.identifier.doihttps://doi.org/10.1007/s00269-018-0998-2pt_BR
dc.identifier.issn1432-2021pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/83720-
dc.description.resumoNatural greenish-yellow titanites from two localities in Brazil (Bananal/Capelinha, MG and Xambioá, TO) were characterized by electron paramagnetic resonance (EPR) and optical absorption. Along with vanadyl ions (VO2+) substituting Ti4+, two other paramagnetic centers were identified: the Fe3+ and the Mn2+. For the VO2+, the principal values and orientations of the g and A tensors were derived from a careful analysis of the angular dependence of the EPR spectra. The obtained results, although different to previously reported data, still support the model for the VO2+ bonds to the nearest oxygen (O1) in the TiO6-distorted octahedra. In addition, the titanite optical absorption spectra were analyzed, and the yellow color was ascribed to Fe3+ ↔ O2− ligand–metal charge transfer transitions (LMCT) in the near-ultraviolet, extending to the violet and blue spectral ranges. The VO2+ center seen by EPR was in low concentration and had no visible effect on the color. Finally, γ-irradiation up to 200 kGy and thermal treatments in oxidizing/reducing atmospheres up to 600–700 °C also had no big influence on the dominant yellow color.pt_BR
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológicopt_BR
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Geraispt_BR
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorpt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentICX - DEPARTAMENTO DE FÍSICApt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofPhysics and Chemistry of Mineralspt_BR
dc.rightsAcesso Restritopt_BR
dc.subjectTitanitept_BR
dc.subjectElectron paramagnetic resonancept_BR
dc.subjectVanadylpt_BR
dc.subjectIronpt_BR
dc.subject.otherRessonância paramagnética eletrônicapt_BR
dc.subject.otherFerropt_BR
dc.titleOn the greenish-yellow color of natural Brazilian titanitept_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://link.springer.com/article/10.1007/s00269-018-0998-2pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-6294-5059pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-7562-0285pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-5722-6260pt_BR
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