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Effect of metal fluorides on chromium ions doped bismuth borate glasses for optical applications |
L Haritha1, K Chandra Sekhar2, R Nagaraju3, G Ramadevudu3, Vasanth G Sathe4, Md. Shareefuddin2 |
1 Department of Physics, Telangana University, Nizamabad, Telangana 503322, India;
2 Department of Physics, Osmania University, Hyderabad, Telangana 500007, India;
3 Department of Physics, Vasavi College of Engineering, Hyderabad, Telangana 500031, India;
4 UGC-DAE Consortium of Scientific Research, Indore 452017, India |
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Abstract Fluoride based glasses with composition CaF2-ZnF2-Bi2O3-B2O3 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 CaF2 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 4A2g→4T1g, 4A2g→→4T2g, 4A2g→2E 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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Received: 13 September 2018
Revised: 29 November 2018
Accepted manuscript online:
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PACS:
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81.05.Kf
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(Glasses (including metallic glasses))
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76.30.-v
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(Electron paramagnetic resonance and relaxation)
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78.30.-j
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(Infrared and Raman spectra)
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Corresponding Authors:
K Chandra Sekhar
E-mail: chandu9417@gmail.com
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Cite this article:
L Haritha, K Chandra Sekhar, R Nagaraju, G Ramadevudu, Vasanth G Sathe, Md. Shareefuddin Effect of metal fluorides on chromium ions doped bismuth borate glasses for optical applications 2019 Chin. Phys. B 28 038101
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