Effect of Chemical Composition of GexAs20Se80-x Glass on Structure and Physical Properties

Abstract

Abstract: In this paper, a series of Ge_xAs₂₀Se_80-x chalcogenide glasses were prepared to study the influences of chemical composition and mean coordination number on its structure and physical properties. The refractive index was measured by the prism coupling method. The transmission was measured by visible-near infrared spectrophotometer. Optical bandgap was derived through the transmission spectrum. The results show that the refractive index decreases and the optical bandgap increases with increasing Ge content up to a transition point corresponding to chemically stoichiometric composition. Raman spectra were measured and decomposed into different structural units. It is found that the relative number of heteropolar bonds in the glasses changes in a reasonable manner with chemical composition, and the number of homopolar bonds is closely related to the change of the bandgap and the refractive index. The main reason is that the band-tails formed by homopolar bonds reduce the optical bandgap. On the other hand, since the number of the structural units and physical properties of the glasses exhibit transitions at the glass with the chemically stoichiometric composition, it can be concluded that the chemical composition dominates physical properties of Ge_xAs₂₀Se_80-x chalcogenide glasses.

Key words: chalcogenide glass, structure, refractive index, optical bandgap, homopolar bond

CLC Number:

TN213

XU Siwei, YANG Xiaoning, SHEN Xiang. Effect of Chemical Composition of Ge_xAs₂₀Se_80-x Glass on Structure and Physical Properties[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2368-2373.

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Effect of Chemical Composition of Ge_xAs₂₀Se_80-x Glass on Structure and Physical Properties

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