EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses
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 ax...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2016-12-01
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| Series: | Materials Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000100046&tlng=en |
| _version_ | 1798014915478290432 |
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| author | M. Purnima Avula Edukondalu K. Siva Kumar Syed Rahman |
| author_facet | M. Purnima Avula Edukondalu K. Siva Kumar Syed Rahman |
| author_sort | M. Purnima |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-04-11T15:24:56Z |
| format | Article |
| id | doaj.art-a4e2ad46078c4aee9b1d44c4863caa9b |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-04-11T15:24:56Z |
| publishDate | 2016-12-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-a4e2ad46078c4aee9b1d44c4863caa9b2022-12-22T04:16:16ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392016-12-01201465210.1590/1980-5373-mr-2016-0042EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate GlassesM. PurnimaAvula EdukondaluK. Siva KumarSyed RahmanElectron 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000100046&tlng=enGlassspin-HamiltonianOptical AbsorptionElectron Spin Resonance |
| spellingShingle | M. Purnima Avula Edukondalu K. Siva Kumar Syed Rahman EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses Materials Research Glass spin-Hamiltonian Optical Absorption Electron Spin Resonance |
| title | 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_short | EPR and Optical Absorption Studies of Cu2+ in Boro-Arsenate Glasses |
| title_sort | epr and optical absorption studies of cu2 in boro arsenate glasses |
| topic | Glass spin-Hamiltonian Optical Absorption Electron Spin Resonance |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000100046&tlng=en |
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