Vanadium characterization in BTO: V sillenite crystals

Detalhes bibliográficos
Autor(a) principal: Carvalho,J.F.
Data de Publicação: 1999
Outros Autores: Franco,R.W.A., Magon,C. J., Nunes,L.A.O., Pellegrini,F., Hernandes,A.C.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14391999000200008
Resumo: Visible 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 BiM3+ + 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.
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spelling Vanadium characterization in BTO: V sillenite crystalssillenitephotorefractivedefectsBTOVisible 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 BiM3+ + 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.ABM, ABC, ABPol1999-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14391999000200008Materials Research v.2 n.2 1999reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14391999000200008info:eu-repo/semantics/openAccessCarvalho,J.F.Franco,R.W.A.Magon,C. J.Nunes,L.A.O.Pellegrini,F.Hernandes,A.C.eng2000-01-21T00:00:00Zoai:scielo:S1516-14391999000200008Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2000-01-21T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Vanadium characterization in BTO: V sillenite crystals
title Vanadium characterization in BTO: V sillenite crystals
spellingShingle Vanadium characterization in BTO: V sillenite crystals
Carvalho,J.F.
sillenite
photorefractive
defects
BTO
title_short Vanadium characterization in BTO: V sillenite crystals
title_full Vanadium characterization in BTO: V sillenite crystals
title_fullStr Vanadium characterization in BTO: V sillenite crystals
title_full_unstemmed Vanadium characterization in BTO: V sillenite crystals
title_sort Vanadium characterization in BTO: V sillenite crystals
author Carvalho,J.F.
author_facet Carvalho,J.F.
Franco,R.W.A.
Magon,C. J.
Nunes,L.A.O.
Pellegrini,F.
Hernandes,A.C.
author_role author
author2 Franco,R.W.A.
Magon,C. J.
Nunes,L.A.O.
Pellegrini,F.
Hernandes,A.C.
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Carvalho,J.F.
Franco,R.W.A.
Magon,C. J.
Nunes,L.A.O.
Pellegrini,F.
Hernandes,A.C.
dc.subject.por.fl_str_mv sillenite
photorefractive
defects
BTO
topic sillenite
photorefractive
defects
BTO
description Visible 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 BiM3+ + 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.
publishDate 1999
dc.date.none.fl_str_mv 1999-04-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14391999000200008
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14391999000200008
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14391999000200008
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.2 n.2 1999
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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