Vanadium characterization in BTO: V sillenite crystals

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dc.creatorCarvalho, Jesiel Freitas
dc.creatorFranco, Roberto Weider de Assis
dc.creatorMagon, Claudio José
dc.creatorNunes, Luiz Antonio de Oliveira
dc.creatorPelegrini, Fernando
dc.creatorHernandes, Antonio Carlos
dc.date.accessioned2018-07-11T14:14:20Z
dc.date.available2018-07-11T14:14:20Z
dc.date.issued1999
dc.description.abstractVisible and Infrared Optical Absorption and Electron Paramagnetic Resonance (EPR) techniques have been used to characterize the intrinsic defects in sillenite type crystals: nominally pure Bi12TiO20 (BTO) and doped with vanadium (BTO:V). Optical quality crystals, with the composition Bi12.04±0.08Ti0.76±0.07V0.16±0.02O20, have been grown. Results obtained by these different techniques have shown unambiguously the 5+ valence state of the vanadium ion in BTO:V crystals. In pure BTO samples, the EPR and optical spectra show strong evidence of the presence of the intrinsic defect BiM 3+ + ho +, which consists of a hole h+, mainly located on the oxygen neighbors of the tetrahedrally coordinated Bi3+ ion. After doping with vanadium, results have shown that the characteristic bands, associated to this hole defect center, disappear, suggesting its transformation in single Bi3+. Anisotropy of the EPR spectra , at 20 K, is related to Fe3+ impurities.pt_BR
dc.identifier.citationCARVALHO, J. F.; FRANCO, R. W. A.; MAGON, C. J.; NUNES, L. A. O. ; PELLEGRINI, F.; HERNANDES, A. C. Vanadium characterization in BTO: V sillenite crystals. Materials Research, São Carlos, v. 2, n. 2, p. 87-91, 1999.pt_BR
dc.identifier.doi10.1590/S1516-14391999000200008
dc.identifier.issne- 1980-5373
dc.identifier.urihttp://repositorio.bc.ufg.br/handle/ri/15385
dc.language.isoengpt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentInstituto de Física - IF (RG)pt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectSillenitept_BR
dc.subjectPhotorefractivept_BR
dc.subjectDefectspt_BR
dc.subjectBTOpt_BR
dc.titleVanadium characterization in BTO: V sillenite crystalspt_BR
dc.typeArtigopt_BR

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