Mixed alkali tungsten borate glasses – Optical and structural properties

Edukondalu, Avula; Kavitha, B.; Samee, M.A.; Ahmmed, Shaik Kareem; Rahman, Syed; Kumar, K. Siva

doi:10.1016/j.jallcom.2012.10.010

Cited by 40 publications

(16 citation statements)

References 82 publications

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“…The second between 700 and 1100 cm -1 is due to stretching vibrations of tetrahedral BO 4 units. The third between 1100 and 1500 cm -1 is due to stretching vibrations of B-O in BO 3 triangles [17,24,25]. Figure 2 shows the optical absorption spectra of the base binary barium borate glass W0 and samples W3, W5 and W9 containing increasing amounts of WO 3 .…”

Section: Infrared Absorption Spectramentioning

confidence: 99%

“…The bands at 550 cm -1 can be attributed to the borate deformation modes such as the inplane bending of boron oxygen triangles [33]. The band at 688 cm -1 is attributed to bending vibration in various borate segments [17]. It is also assigned to bending vibrations of penta-borate groups, which are composed of BO 4 and BO 3 units [34,35].…”

Section: Interpretation Of Ftir Spectra Of Base and Wo 3 -Doped Glassesmentioning

confidence: 99%

“…The bands at 950-975 and 1025 cm -1 are attributed to the stretching of B-O bond in tetrahedral BO 4 units, which are the vibrations of tetra borate (tri borate and penta borate) groups of BO 4 units [17,36,37].…”

Section: Interpretation Of Ftir Spectra Of Base and Wo 3 -Doped Glassesmentioning

confidence: 99%

“…The optical properties of mixed alkai-WO 3 -B 2 O 3 containing 10 mol% WO 3 were studied [4,17]. Lithium tungsten borate glasses with 0.04 mol% WO 3 were investigated for the effect of ZnO on the optical nonlinearity of the glasses [18].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric, electrical and spectroscopic properties of barium borates of low WO3 content

Morsi

Abdelghany

Morsi

2015

J Mater Sci: Mater Electron

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Infrared and optical absorption UV-Vis measurements, electrical and dielectric properties were carried out for glasses with the composition (mol%) 60B 2 O 3 Á 40BaO containing 0.0, 3, 5 and 9 g WO 3 /100 g glass. Infrared absorption spectra of all glasses indicate the presence of both triangular BO 3 units and tetrahedral BO 4 units, and the latter is overlapped with stretching vibrations of WO 4 and WO 6 units. UV-Vis measurements reveal strong charge transfer cutoff and no absorption bands were recorded in the visible region. Upon increasing WO 3 content in the studied glasses the optical band gap (E opt ) and the electrical conductivity values increase whereas activation energy values decrease. The increase in the electrical conduction was attributed to the hopping mechanism between the two sites of tungsten (W 5? , W 6? ). In the low frequency region below 1 kHz the dielectric constant measured at 200 Hz and room temperature was increased from 27 to 177 on increasing WO 3 content from 0.0 to 9.0 g WO 3 per 100 g glass, respectively. At 300°C the dielectric constant reached a value of 435 for sample containing 9.0 g WO 3 per 100 g glass. The present results may make it as a promising candidate for energy storage in electronic applications.

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Section: Infrared Absorption Spectramentioning

confidence: 99%

Section: Interpretation Of Ftir Spectra Of Base and Wo 3 -Doped Glassesmentioning

confidence: 99%

Section: Interpretation Of Ftir Spectra Of Base and Wo 3 -Doped Glassesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dielectric, electrical and spectroscopic properties of barium borates of low WO3 content

Morsi

Abdelghany

Morsi

2015

J Mater Sci: Mater Electron

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“…These glasses have large non-linear optical susceptibility coefficient [1][2][3][4] that makes them suitable for potential applications in non-linear optical devices (such as ultra-fast optical switches and power limiters), broad band optical amplifiers operating around 1.5 μm and in a number of solid state ionic devices.…”

Section: Introductionmentioning

confidence: 99%

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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