Optical and spectroscopic investigation on Calcium Borotellurite glass system |
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| Affiliation: | 1. CCSST – UFMA, Imperatriz, MA, Brazil;2. IFMA, Açailândia, MA, Brazil;3. IFMA, Imperatriz, MA, Brazil;1. Wireless and Photonic Networks Research Centre, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia;2. Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;3. School of Materials Science and Engineering, Tongji University, Shanghai 201804, China;4. Department of Physics, Faculty of Science, Autonomous University of Mexico State, C.P. 50000 Toluca, Mexico;5. Faculty of Electrical Engineering, Czestochowa University of Technology, Armii Krajowej 17, PL-42-217 Czestochowa, Poland;1. Department of Physics, Guru Nanak Dev University, Amritsar, 143005, Punjab, India;2. Department of Chemistry and Process & Recourse Engineering, University of Cantabria, Santander, 39005, Spain;3. Department of Chemistry & Biochemistry, Florida State University, Tallahassee, FL, 3206-4390, USA;1. Laboratoire des Matériaux Minéraux et leurs Applications, Centre National de Recherches en Sciences des Matériaux, Technopole de Borj-Cedria, B.P. 95, Hammam-Lif 2050, Tunisia;2. Département de Physique, Faculté des Sciences de Tunis, University of Tunis ElManar – ElManar, 2092, Tunisia;1. Department of Physics, Maharshi Dayanand University, Rohtak 124001, India;2. Department of Applied Physics, Guru Jambheshwar University of Science and Technology, Hisar 125001, India;3. Department of Physics, Indira Gandhi University, Meerpur, Rewari 123401, India;4. Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India |
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| Abstract: | In this work, the glass formation in Calcium Borotellurite (CBTx) system and their optical properties were studied. Six glass samples were prepared by melt-quenching technique and the samples obtained are transparent, lightly yellowish, without any visible crystallites. The results showed that TeO2 addition increases the density, the electronic polarizability and, consequently, the refractive index. The increase of electronic polarizability and optical basicity suggest that TeO2 addition increases the non-bridging oxygen (NBO) concentration. The increase of TeO2 shifts the band edge to longer wavelength owing to increase in non-bridging oxygen ions, resulting in a linear decrease of optical energy gap. The addition of TeO2 increases the temperature coefficient of the optical path length (dS/dT) in room temperature, which are comparable to phosphate and lower than Low Silica Calcium Alumino Silicate (LSCAS) glasses. The values of dS/dT present an increase as a function of temperature for all the samples measured. The results suggest that CBTx is a good candidate for rare-earth doping and several optical applications. |
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| Keywords: | Borotellurite glasses Optical energy gap Non-bridging oxygens Optical basicity IR |
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