Open Access

ARTICLE

Composition-dependent properties and network structure of Ge-Se-Te chalcogenide glasses

L. Yang^a,b,c, G. J. Zhou^a,b,c, C. G. Lin^a,b,c,*

a Laboratory of Infrared Materials and Devices, The Research Institute of Advanced Technologies, Ningbo University, Ningbo 315211, China
b Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, Ningbo 315211, China
c Engineering Research Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province, Ningbo University, Ningbo 315211, China

* Corresponding Author:

Chalcogenide Letters 2023, 20(1), 1-9. https://doi.org/10.15251/CL.2023.201.1

Received 20 October 2022; Accepted 03 January 2023;

Abstract

Ge_12.5Se_87.5-xTe_x (0≤x≤45) glasses were selected for elucidating the composition-dependent properties and network structure of Te-containing glasses. With increasing Te content (x), Vickers hardness (H_v) and glass transition temperature (T_g) initially increased and then decreased, showing a compositional threshold at x=27.5. It is found that the compositional trend of H_v and T_gg is in good accordance with the structural evolution studied by Raman spectra. The results suggest that the introduction of Te leads to the evolution of the network connectivity and average bond strength of Ge_12.5Se_87.5-xTe_x glass structure, which imposes an opposite impact on the structural properties (H_v and T_g). This work provides a new insight to the structure-property correlation of Ge-Se-Te, which would facilitate the understanding of the structural role of Te in ChGs.

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Keywords

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