Electron paramagnetic resonance and optical absorption studies of Cu2+ spin probe in MgO–Na2O–B2O3 ternary glasses

Ramadevudu, G.; Shareefuddin,; Bai, Nan-Nan; Rao, M. Venkateshwara; Chary, M. Narasimha

doi:10.1016/s0022-3093(00)00255-6

Cited by 77 publications

(25 citation statements)

References 28 publications

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“…Therefore, in the present investigation, with the increase in Bi 2 O 3 content, optical basicity increases and hence the covalency between Cu 2+ ions and oxygen ligands decreases, which is clear from Γ π values. Similar observation was reported by [11,29].…”

Section: Bond Parameterssupporting

confidence: 91%

“…Unconventional glasses containing Bi 2 O 3 as glass former are of great interest because of their potential applications in industry and many allied areas [5][6][7]. EPR investigations of Cu 2+ ions in glasses are interesting and have received a considerable attention due to the sensitivity of parameters to local symmetry and have been studied in wide variety of glasses [8][9][10][11][12][13]. Optical absorption of transition metal (TM) ions in glasses is influenced by host structure into which the transition metal ions are incorporated.…”

Section: Introductionmentioning

confidence: 99%

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EPR and Optical Absorption Spectral Investigations of Cu²⁺ in Bi₂O₃-ZnO-B₂O₃-Li₂O Glasses

Bale

Rahman

2012

ISRN Spectroscopy

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O glasses were made by introducing Cu 2+ as spin probe. The EPR spectra of Cu 2+ in all the glass samples recorded in the X-band frequency have similar spectral features. The variation in glass composition influences the spin Hamiltonian parameters calculated from the spectra. The spin Hamiltonian parameters indicate that the Cu 2+ ions are coordinated with six ligand atoms in a distorted octahedron elongated along one of the axes and the ground state of the Cu 2+ is d x 2 −y 2 orbital. The optical absorption spectra exhibited a broad band corresponding to d-d transition bands of Cu 2+ ion. The values of bonding parameters indicate a covalent nature for the in-plane σ bonding and pure ionic nature for the in-plane and out-of-plane π bonding. The theoretical optical basicity parameter values were evaluated, and it was observed that the value of Γ σ increases whereas Γ π decreases with the increase in optical basicity.

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Section: Bond Parameterssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

EPR and Optical Absorption Spectral Investigations of Cu²⁺ in Bi₂O₃-ZnO-B₂O₃-Li₂O Glasses

Bale

Rahman

2012

ISRN Spectroscopy

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“…This departure from linearity is called the mixed alkali effect 18 . Similar observations were made in the case of mixed alkalialkaline earth oxide glasses 19 . This phenomenon is called mixed oxide effect.…”

Section: Introductionsupporting

confidence: 82%

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

et al. 2016

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Electron paramagnetic resonance (EPR) and optical absorption studies of xMgO-(25-x) Li 2 O-50B 2 O 3 -25As 2 O 3 glasses were made by introducing Cu 2+ as a spin probe. The EPR spectra of all the glass samples recorded at X-band frequencies have similar spectral features. The Cu 2+ 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 Cu 2+ is d x2-y2 and the site symmetry around Cu 2+ ions is tetragonal distorted octahedral. The optical absorption spectra exhibited a broadband corresponding to the d-d transition bands of Cu 2+ 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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“…Doped samples contain an extended absorption edge above 400 nm and a broad absorption peak in between 550 and 900 nm. The first absorption between 400 and 500 nm appears as a result of interfacial charge transfer from the O 2p valence band to the Cu(II) state attached to TiO 2 [31][32][33][34][35][36][37]. These Cu(II) states may be present either as Cu(II) nanoclusters or in the form of amorphous oxide phase of CuO.…”

Section: Study Of Optical Propertiesmentioning

confidence: 99%

“…Apart from the absorption band between 400 and 500 nm, doped samples contain another absorption hump extending from 550 to 900 nm. The second absorption band is mainly due to the d-d transition of Cu 2+ in the crystalline environment of TiO 2 [31][32][33][34][35][36][37] ground state and 2 T 2g excited state with a single electronic transition. However, from the XRD and Raman spectra of the samples, it was found that doping of Cu 2+ generates oxygen vacancies which lie near Cu 2+ .…”

Section: Study Of Optical Propertiesmentioning

confidence: 99%

Defect generation, d-d transition, and band gap reduction in Cu-doped TiO2 nanoparticles

2013

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TiO 2 doped with Cu 2+ initiates the formation of brookite phase along with anatase. Doping of Cu 2+ introduces structural defects into TiO 2 . The direct evidence is the low intense and broad diffraction peaks. Raman peaks of doped TiO 2 are also broad and are blueshifted. Pure TiO 2 exhibits an absorption in the UV region, the position of which is shifted towards the visible region on incorporation of Cu into it. The visible absorption peaks arise due to the

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Electron paramagnetic resonance and optical absorption studies of Cu2+ spin probe in MgO–Na2O–B2O3 ternary glasses

Cited by 77 publications

References 28 publications

EPR and Optical Absorption Spectral Investigations of Cu²⁺ in Bi₂O₃-ZnO-B₂O₃-Li₂O Glasses

EPR and Optical Absorption Spectral Investigations of Cu²⁺ in Bi₂O₃-ZnO-B₂O₃-Li₂O Glasses

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

Defect generation, d-d transition, and band gap reduction in Cu-doped TiO2 nanoparticles

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Electron paramagnetic resonance and optical absorption studies of Cu2+ spin probe in MgO–Na2O–B2O3 ternary glasses

Cited by 77 publications

References 28 publications

EPR and Optical Absorption Spectral Investigations of Cu2+ in Bi2O3-ZnO-B2O3-Li2O Glasses

EPR and Optical Absorption Spectral Investigations of Cu2+ in Bi2O3-ZnO-B2O3-Li2O Glasses

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

Defect generation, d-d transition, and band gap reduction in Cu-doped TiO2 nanoparticles

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EPR and Optical Absorption Spectral Investigations of Cu²⁺ in Bi₂O₃-ZnO-B₂O₃-Li₂O Glasses

EPR and Optical Absorption Spectral Investigations of Cu²⁺ in Bi₂O₃-ZnO-B₂O₃-Li₂O Glasses