Vibrational spectra and structure of bismuth based quaternary glasses

Bale, Shashidhar; Purnima, M.; Srinivasu, Ch.; Rahman, Syed

doi:10.1016/j.jallcom.2007.03.100

Cited by 49 publications

(17 citation statements)

References 26 publications

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“…The electron paramagnetic resonance (EPR) spectroscopic technique was first applied to glassy materials by Sands [1]. 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].…”

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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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: 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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“…It is found that Urbach energy decreases with increase in the Li 2 O content in the present glass system shown in table 1. is attributed to the vibrations of chain type metaborate groups [8]. In Raman spectra the strong band observed around 929cm -1 can be assigned to vibrations of orthoborate groups [1,10]. It is observed that the intensity of this band remains constant this is because the B 2 O 3 content remains constant in the glass system.…”

Section: Resultsmentioning

confidence: 92%

“…">IntroductionThe interest in heavy metal oxide glasses is due to their long infrared cut-off and optical non-linearity [1]. Bismuth based oxide glasses have attracted the attention of scientific community, due to their important applications in the field of glass ceramics, thermal and mechanical sensors etc.…”

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confidence: 99%

Spectroscopic studies of xLi₂O-(40-x)Bi₂O₃-20CdO-40B₂O₃ Glasses

Kumar

Edukondalu

Muralimohan

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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IntroductionThe interest in heavy metal oxide glasses is due to their long infrared cut-off and optical non-linearity [1]. Bismuth based oxide glasses have attracted the attention of scientific community, due to their important applications in the field of glass ceramics, thermal and mechanical sensors etc. a survey of literature shows that there are many reports available on quaternary bismuth borate glasses [2,3]. The present work is focused on studying the effect of Bi 2 O 3 and Li 2 O on cadmium borate quaternary glass system. The presence of the two glass formers Bi 2 O 3 and B 2 O 3 increases the interest in present study.

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“…Contributed Article various authors [12,13] that this band originates from Bi-O bonds in BiO 6 octahedra and the shifting to lower ) (at x = 10 mol %) is due to the decrease of the degree of distortion [12,14] and the same was also observed in IR spectra of other bismuth based glasses [15]. Some authors [16][17][18] observed band in the wave number range 440-470 cm -1 and attributed to the symmetric oxygen bending-rock mode (R) BO's bonding.…”

Section: +mentioning

confidence: 81%

Influence of Ba²⁺ ions on defect concentration in bismuth silicate glasses evidenced by FTIR and UV‐visible spectroscopy

Ahlawat

Agarwal

Sanghi

2011

Phys. Status Solidi C

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Bismuth silicate glasses containing Ba2+ ions were prepared by a normal melt quench technique in a wide range of composition. The present study includes structural and optical characterization of these glasses by using the techniques of IR and UV‐visible spectroscopy. The variation in density and molar volume with Ba2+ ion concentration was related to structural changes occurring in the glass. The large difference in crystalline temperature (TC) and glass transition temperature (Tg) value shows the thermal stability of these glasses. Analysis of IR spectra shows the occurrence of broad and strong band around 456‐471 cm‐1, attributed to both Bi‐O‐ stretching vibrations in distorted linked [BiO6] units and bending vibrations of the silicate network. The shifting of center of the band around 800 ‐ 1100 cm‐1 with the increase in Ba2+ ions concentration in glass matrix suggests a decrease in Si‐O‐Si bond angle and causes glass network shrinkage which is also supported by observed decrease in molar volume. The analysis of optical absorption spectra of these glasses reveals that the position of absorption edge and cutoff wavelength shift towards blue as Ba2+ ion concentration increases in the glass composition. The variation in optical band gap energy (Eg) with change in glass composition may be attributed to the indirect influence of the Ba2+ ions on the band gap and can be evaluated from the Tauc's plots for indirect allowed and indirect forbidden transitions. The increase in optical band gap (Eg) from optical absorption analysis indicates that the glass network becomes more compact and degree of disorder decreases with increase of concentration of Ba2+ ions. The origin of Urbach's energy is associated with phonon‐assisted indirect transitions and its value varies with the random internal electric field either due to lack of long range order or presence of defects. From Urbach energy values, it was concluded that the defect concentration could be controlled by the presence of Ba2+ ions in the present glass system (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Vibrational spectra and structure of bismuth based quaternary glasses

Cited by 49 publications

References 26 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

Spectroscopic studies of xLi₂O-(40-x)Bi₂O₃-20CdO-40B₂O₃ Glasses

Influence of Ba²⁺ ions on defect concentration in bismuth silicate glasses evidenced by FTIR and UV‐visible spectroscopy

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Vibrational spectra and structure of bismuth based quaternary glasses

Cited by 49 publications

References 26 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

Spectroscopic studies of xLi2O-(40-x)Bi2O3-20CdO-40B2O3 Glasses

Influence of Ba2+ ions on defect concentration in bismuth silicate glasses evidenced by FTIR and UV‐visible spectroscopy

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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

Spectroscopic studies of xLi₂O-(40-x)Bi₂O₃-20CdO-40B₂O₃ Glasses

Influence of Ba²⁺ ions on defect concentration in bismuth silicate glasses evidenced by FTIR and UV‐visible spectroscopy