Compositional dependence of the optical properties of novel Ge-Ga-Te-CsI far infrared transmitting chalcohalide glasses system |
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Authors: | Guoxiang Wang Qiuhua Nie Xunsi Wang Xiang Shen Xianghua Zhang |
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Affiliation: | a Faculty of Information Science and Engineering, Ningbo University, The State Key Laboratory Base of Novel Functional Materials and Preparation Science, Ningbo 315211, China b Université Lille1 Sciences et Technologies, LASIR, C5, 59655 Villeneuve d’Ascq Cedex, France c Laboratoire des Verres et Ceramiques, Université de Rennes I, 35042 Rennes Cedex, France |
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Abstract: | A systematic series of (Ge15Ga10Te75)1−x(CsI)x (x=0, 5, 10, 15 at%) far infrared transmitting chalcohalide glasses were prepared by the traditional melt-quenching method. The physical, thermal and optical properties were determined. The allowed direct transition and indirect transition of samples were calculated according to the Tauc equation. The results show that glass transition temperatures (Tg) were in the range 133-175 °C, with ΔT values between 81 and 130 °C. The highest values of metallization criterion (0.244) and energy gap (1.191 eV) were obtained for (Ge15Ga10Te75)85(CsI)15. When the dissolved amount of CsI increased from 0 to 15 at%, the direct optical band gap and indirect optical band gap were in the ranges 0.629-1.075 eV and 0.438-0.524 eV, respectively. The Ge-Ga-Te-CsI glasses have an effective transmission window between 1.7 and 25 μm, encompassing the region of interest for bio-sensing applications. |
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Keywords: | A. Chalcogenides A. Glasses D. Optical properties |
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