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ISHU SHARMA1,* , AMAL ZAKIR KHAN1,*
- Department of Physics, Amity University Dubai, U.A.E.
Using average coordination number (〈𝒓〉), lone pair electrons (𝐿) are calculated and found to decrease with an increase in Bi content. 𝐿 value greater than 3 indicates that Ge18Se72-xTe10Bix (x = 0, 2, 4, 6, 8, 10) alloys can retain their vitreous nature. Packing density shows subsequent decrease with an increase in density values. Compactness of the structure and molar volume are calculated from the measured density values. Polaron radius is found to decrease with an increase in Bi content. Mean bond energy is found to be proportional to the glass transition temperature and shows maxima at the chemical threshold. Cohesive energy of the system is calculated using the Chemical Bond Approach (CBA) model and a linear relationship is found between cohesive energy and the theoretical band gap. Results are explai ned on the basis of decrease in average stabilization energy and electronegativity of the system. Degree of the covalency character of different heteropolar bonds is also calculated. An effort is made to discuss the results in terms of average coordination number or equivalently structure of the glassy matrix..
Glass forming ability, Density, Glass transition temperature, Cohesive energy, Theoretical band gap.
Submitted at: Aug. 18, 2016
Accepted at: Nov. 28, 2017
ISHU SHARMA, AMAL ZAKIR KHAN, An assessment of topology and compositional dependent physical parameters of Ge-Se-Te-Bi lone pair semiconductors, Journal of Optoelectronics and Advanced Materials Vol. 19, Iss. 11-12, pp. 778-787 (2017)
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