EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses

Detalhes bibliográficos
Autor(a) principal: Purnima,M.
Data de Publicação: 2017
Outros Autores: Edukondalu,Avula, Kumar,K. Siva, Rahman,Syed
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=S1516-14392017000100046
Resumo: Electron paramagnetic resonance (EPR) and optical absorption studies of xMgO- (25-x) Li2O-50B2O3-25As2O3 glasses were made by introducing Cu2+ as a spin probe. The EPR spectra of all the glass samples recorded at X-band frequencies have similar spectral features. The Cu2+ ions are in well-defined axial sites, but subjected to small distortion leading to the broadening of the spectra. The spin-Hamiltonian parameter values indicate that the ground state of Cu2+ is dx2- y2 and the site symmetry around Cu2+ ions is tetragonal distorted octahedral. The optical absorption spectra exhibited a broadband corresponding to the d-d transition bands of Cu2+ ion. By correlating EPR and optical data, the bond parameters were evaluated and the values show purely ionic nature for the in-plane σ bonding and in-plane π bonding. The out-of-plane π bonding is moderately covalent.
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spelling EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate GlassesGlassspin-HamiltonianOptical AbsorptionElectron Spin ResonanceElectron paramagnetic resonance (EPR) and optical absorption studies of xMgO- (25-x) Li2O-50B2O3-25As2O3 glasses were made by introducing Cu2+ as a spin probe. The EPR spectra of all the glass samples recorded at X-band frequencies have similar spectral features. The Cu2+ ions are in well-defined axial sites, but subjected to small distortion leading to the broadening of the spectra. The spin-Hamiltonian parameter values indicate that the ground state of Cu2+ is dx2- y2 and the site symmetry around Cu2+ ions is tetragonal distorted octahedral. The optical absorption spectra exhibited a broadband corresponding to the d-d transition bands of Cu2+ ion. By correlating EPR and optical data, the bond parameters were evaluated and the values show purely ionic nature for the in-plane σ bonding and in-plane π bonding. The out-of-plane π bonding is moderately covalent.ABM, ABC, ABPol2017-02-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000100046Materials Research v.20 n.1 2017reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/1980-5373-mr-2016-0042info:eu-repo/semantics/openAccessPurnima,M.Edukondalu,AvulaKumar,K. SivaRahman,Syedeng2017-03-22T00:00:00Zoai:scielo:S1516-14392017000100046Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2017-03-22T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses
title EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses
spellingShingle EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses
Purnima,M.
Glass
spin-Hamiltonian
Optical Absorption
Electron Spin Resonance
title_short EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses
title_full EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses
title_fullStr EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses
title_full_unstemmed EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses
title_sort EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses
author Purnima,M.
author_facet Purnima,M.
Edukondalu,Avula
Kumar,K. Siva
Rahman,Syed
author_role author
author2 Edukondalu,Avula
Kumar,K. Siva
Rahman,Syed
author2_role author
author
author
dc.contributor.author.fl_str_mv Purnima,M.
Edukondalu,Avula
Kumar,K. Siva
Rahman,Syed
dc.subject.por.fl_str_mv Glass
spin-Hamiltonian
Optical Absorption
Electron Spin Resonance
topic Glass
spin-Hamiltonian
Optical Absorption
Electron Spin Resonance
description Electron paramagnetic resonance (EPR) and optical absorption studies of xMgO- (25-x) Li2O-50B2O3-25As2O3 glasses were made by introducing Cu2+ as a spin probe. The EPR spectra of all the glass samples recorded at X-band frequencies have similar spectral features. The Cu2+ ions are in well-defined axial sites, but subjected to small distortion leading to the broadening of the spectra. The spin-Hamiltonian parameter values indicate that the ground state of Cu2+ is dx2- y2 and the site symmetry around Cu2+ ions is tetragonal distorted octahedral. The optical absorption spectra exhibited a broadband corresponding to the d-d transition bands of Cu2+ ion. By correlating EPR and optical data, the bond parameters were evaluated and the values show purely ionic nature for the in-plane σ bonding and in-plane π bonding. The out-of-plane π bonding is moderately covalent.
publishDate 2017
dc.date.none.fl_str_mv 2017-02-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000100046
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000100046
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/1980-5373-mr-2016-0042
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.20 n.1 2017
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
_version_ 1754212668806266880

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