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Asokan, S.
- Composition Dependence of Optical Band Gap and Thermal Diffusivity of In-Se-Tl Bulk Glasses
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Authors
Affiliations
1 Department of Electronics, Maharani’s Science College for Women, Bangalore-560 001, Karnataka, IN
2 Department of Electronic Science, Bangalore University, Bangalore-560 056, Karnataka, IN
3 Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore-560 012, IN
1 Department of Electronics, Maharani’s Science College for Women, Bangalore-560 001, Karnataka, IN
2 Department of Electronic Science, Bangalore University, Bangalore-560 056, Karnataka, IN
3 Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore-560 012, IN
Source
International Journal of Applied Engineering Research, Vol 8, No 1 (2013), Pagination: 23-32Abstract
Bulk melt-quenched In15Se85-xTlx (2≤x≤10) chalcogenide glasses are studied for their composition dependence of optical band gap (Eg) and thermal diffusivity (α) using UV visible spectrophotometer and photo-thermal deflection spectroscopy techniques respectively. The thermal diffusivity of these glasses is found to lie in the range of 0.0102 to 0.0388 cm2/s, which is higher and consistent with the threshold type of electrical switching exhibited by these samples. The α of these glasses is found to decrease up to x≤6, beyond which it increases. The absorption spectra of these materials have been obtained in the range of 380-1020 nm. The Eg has been estimated from plot of absorption coefficient as a function of wavelength by using Tauc relation. Further, a minimum is observed in the composition dependence of α and a maximum in Eg at the average coordination <r> = 2.42 (x=6) is attributed to the rigidity percolation threshold. The effect seen in the compositional dependence of α and Eg can be understood with increase in network connectivity, rigidity and Moss-Burstein effect respectively.References
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Authors
Affiliations
1 Natural Resources Division, Bengal Energy Limited, Kolkata - 700 071, IN
2 Minerals and Materials Division, Everest Industries Limited, Mumbai - 400 072, IN
3 Department of Applied Geology, Indian School of Mines, Dhanbad - 826 004, IN
1 Natural Resources Division, Bengal Energy Limited, Kolkata - 700 071, IN
2 Minerals and Materials Division, Everest Industries Limited, Mumbai - 400 072, IN
3 Department of Applied Geology, Indian School of Mines, Dhanbad - 826 004, IN