On the greenish-yellow color of natural Brazilian titanite

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dc.creatorEder Luiz Tolentino Junior
dc.creatorCoralie Heinis Dias
dc.creatorMario Luiz de Sá Carneiro Chaves
dc.creatorKlaus Wilhelm Heinrich Krambrock
dc.creatorMauricio Veloso Brant Pinheiro
dc.date.accessioned2025-07-22T12:10:07Z
dc.date.accessioned2025-09-09T00:04:32Z
dc.date.available2025-07-22T12:10:07Z
dc.date.issued2019
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.identifier.doihttps://doi.org/10.1007/s00269-018-0998-2
dc.identifier.issn1432-2021
dc.identifier.urihttps://hdl.handle.net/1843/83720
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofPhysics and Chemistry of Minerals
dc.rightsAcesso Restrito
dc.subjectRessonância paramagnética eletrônica
dc.subjectFerro
dc.subject.otherTitanite
dc.subject.otherElectron paramagnetic resonance
dc.subject.otherVanadyl
dc.subject.otherIron
dc.titleOn the greenish-yellow color of natural Brazilian titanite
dc.typeArtigo de periódico
local.citation.epage213
local.citation.spage203
local.citation.volume46
local.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.
local.identifier.orcidhttps://orcid.org/0000-0001-6294-5059
local.identifier.orcidhttps://orcid.org/0000-0002-7562-0285
local.identifier.orcidhttps://orcid.org/0000-0001-5722-6260
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://link.springer.com/article/10.1007/s00269-018-0998-2

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