The role of halides on a chromium ligand field in lead borate glasses

Sekhar, K. Chandra; Srinivas, B.; Narsimlu, N.; Chary, M. Narasimha; Shareefuddin,

doi:10.1088/2053-1591/aa8d7e

Cited by 20 publications

(7 citation statements)

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“…Density plays an important role in understanding the modification of BO 3 into four fold BO 4 units, and vice versa. [1,[34][35][36] In the present study, it was found that the density decreases from 5.236 gm/cc (CZBBCR1) to 4.819 gm/cc (CZBBCR5) with increasing CaF 2 concentration. The molar volume (V m ) was estimated from density and the molecular weight (M) of the glass sample.…”

Section: Density and Molar Volumesupporting

confidence: 53%

“…From previous literature, the variation in density is explained using the physical parameters like crystal density, molecular weight and/or ionic radius. [1,34,[37][38][39] The gradual enhancement in the mole percentage of CaF 2 in the CZB-BCR glass system caused a nonlinear decrease in the density, which is suitably explained using the crystal density of calcium fluoride (3.18 gm/cc) which is lesser than zinc fluoride (4.95 gm/cc). It can also be assigned to fractional replacement of low molecular weight CaF 2 (78.07 g/mol) by the high molecular weight ZnF 2 (103.406 g/mol).…”

Section: Density and Molar Volumementioning

confidence: 99%

“…[27][28][29][30] Amongst all doped transition metal glasses, the Cr 3+ ion-doped glasses are given importance as they have applications in tunable solid state lasers, fiber optical communication, etc. [31][32][33][34] Keeping in view the role of chromium in the glass matrices and the importance of bismuth borate glasses, authors have investigated the physical and spectroscopic studies of CaF 2 -ZnF 2 -Bi 2 O 3 -B 2 O 3 glasses doped with chromium ions.…”

Section: Introductionmentioning

confidence: 99%

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Effect of metal fluorides on chromium ions doped bismuth borate glasses for optical applications

Haritha

Sekhar

Nagaraju³

et al. 2019

Chinese Phys. B

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Fluoride based glasses with composition CaF 2 -ZnF 2 -Bi 2 O 3 -B 2 O 3 doped with chromium ions have been investigated using physical, optical, electron paramagnetic resonance (EPR), Fourier-transform infrared spectroscopy (FTIR), and Raman studies. The amorphous nature of samples was confirmed from x-ray diffraction spectra. The density is evaluated from the Archimedes principle and the values of optical band gap and Urbach energy values were evaluated from the optical absorption spectra. Thus, molar volume, refractive index, etc., were also evaluated. The observed decrease in density and the optical band gap with CaF 2 is explained using the crystalline density of metal fluorides and the ionicity of fluorine ions, respectively. The three peaks near 450 nm, 606 nm, and 720 nm, which are shown in the absorption spectra, are accredited to 4 A 2g → 4 T 1g , 4 A 2g → 4 T 2g , 4 A 2g → 2 E transitions, respectively. Resonance signals at g ≈ 4.82 and g ≈ 1.99 were observed in EPR spectra which are assigned. FTIR and Raman analysis were carried out to examine the impact of metal fluorides on the structure of bismuth borate glasses.

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Section: Density and Molar Volumesupporting

confidence: 53%

Section: Density and Molar Volumementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of metal fluorides on chromium ions doped bismuth borate glasses for optical applications

Haritha

Sekhar

Nagaraju³

et al. 2019

Chinese Phys. B

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“…Most of the research work on glasses includes density measurements employing Archimedes principle. Using density values, molar volume V m is estimated [1,14]. It is observed that the density values are decreasing from 2.705 to 2.451 g/cc with increasing Al 2 O 3 from 5 to 15 mol% with decreasing equal amount of SrO content in the glass composition.…”

Section: Physical Propertiesmentioning

confidence: 99%

“…Using these spectra, the absorption coefficient 'α' can be measured as a function of frequency using the given formula [22] in the above equation, absorbance is represented by 'A' at frequency ν and 'd' represents the thickness of the sample. The indirect transitions are calculated using the relation [14] where 'b' is the energy-independent constant and in the above equation index n has different values, n = 2 and 1/2 for direct and indirect allowed transitions, respectively. The graph plotted for indirect transition is shown in Fig.…”

Section: Optical Absorption Spectra and Energy Band Gapmentioning

confidence: 99%

EPR, optical, physical and structural studies of strontium alumino-borate glasses containing Cu2+ ions

Ahmed

Shareefuddin

2019

SN Appl. Sci.

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Glass composition (30 − x) SrO-xAl 2 O 3-69.5B 2 O 3-0.5CuO (0 ≤ x ≤ 15 mol%) captioned as SABC was prepared by the conventional melt quenching technique. Peak-free X-ray diffractograms and homogeneous plain SEM image confirm the glassy nature of the prepared samples. EPR and optical absorption spectral studies were carried out to understand the effect of modifier oxide (SrO) and transition metal (TM) ion Cu 2+ in the glass network. From the EPR spectra, spin-Hamiltonian parameters were evaluated. It was observed that g ∥ > g ⊥ > g e and A ∥ > A ⊥ suggest that the ground state of Cu 2+ is d x 2 −y 2 (2 B 1g state) and the site symmetry around Cu 2+ is tetragonally distorted octahedral. The optical absorption spectra revealed a broad absorption for all the glass samples. This band is assigned to 2 B 1g → 2 B 2g transition. From optical absorption spectra, optical band gap and Urbach energy values were calculated. The FTIR and Raman spectral studies showed that the glass network consists of BO 3 and BO 4 structural units.

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