Structural Origin of Change Rate in Viscosity for Several Chalcogenide Glasses

Abstract

Abstract: Ge₃₃As₁₂Se₅₅, Ge₂₂As₂₀Se₅₈, Ge₁₀As₄₀Se₅₀, As₄₀Se₆₀, and Se chalcogenide glasses were prepared by the melt-quenching technique. The viscosities of these chalcogenide glasses were measured by a rheometer. Based on these data, the corresponding Vogel-Fulcher-Tammann equationsand change rate in viscosity were obtained. Based on the Raman spectra, the structural characteristics of these glasses were analyzed systematically. With the increase of Ge and As content in Ge_xAs_ySe_100-x-y chalcogenide glasses, the change rate in viscosity upon temperature decreases first and then increases. When the average coordination number <r> is 2 to 2.6, with the increase of the average coordination number, the average chemical bonding energy and network structure stability of the glass gradually increase, and the change rate in viscosity upon temperature decreases. When <r> is 2.6 to 2.78, with the appearance of As-As/Ge-Ge chemical bonds in the structure, the stability of the glass network is deteriorated, and the glass viscosity changes faster upon temperature. The change rate of glass viscosity is consistent with the structural constraint theory, and the change rate of glass viscosity reaches its minimum value at <r>=2.6.

Key words: chalcogenide glass, structure, viscosity, change rate in viscosity

CLC Number:

TQ171

ZHOU Peng, ZHAO Hua, ZU Chengkui, TAO Haizheng, LIU Yonghua, ZHANG Rui, CHEN Wei. Structural Origin of Change Rate in Viscosity for Several Chalcogenide Glasses[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1692-1697.

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