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Structure and physical properties of Ge 15 Sb 20 Se 65‐ x S x glasses
Author(s) -
Wang Rongping,
Xu Qin,
Liu Haitao,
Sheng Yan,
Yang Xinyu
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15206
Subject(s) - chalcogen , raman spectroscopy , chalcogenide , chemical bond , x ray photoelectron spectroscopy , materials science , refractive index , germanium , analytical chemistry (journal) , chemical composition , band gap , bond length , crystallography , chemistry , crystal structure , optics , optoelectronics , nuclear magnetic resonance , silicon , physics , organic chemistry , chromatography
We explored the structure and physical properties of Ge 15 Sb 20 Se 65‐ x S x (with x = 0, 16.25, 32.5, 48.75, and 65) glasses in order to screen the best compositions for the applications in photonics, since the laser damage thresholds in Se‐based glasses are too low although their optical nonlinearities are high. We found that, linear and nonlinear refractive index of the glasses decreased, but glass transition temperature T g , optical bandgap E g and the laser damage threshold increased with increasing S content. We further employed Raman scattering and high‐resolution X‐ray photoelectron spectra to probe the structure of the glasses. Through the analysis of the evolution of the different structural units in the glasses, it was concluded that, the heteropolar bonds (Ge–Se/S, Sb–Se/S) were dominated in these glasses. With the increase in chalcogen Se/S ratio, the number of the Se‐related chemical bonds (Ge–Se, Sb–Se and Se–Se) increased and that of S‐related chemical bond (Ge–S, Sb–S and S–S) decreased gradually, and Ge was prior to bond with S rather than Se. The elemental substitution thus had negligible effect on the glass structure. The change of the physical properties was mainly due to the difference of the strength of the chemical bonds between S–Ge(Sb) and Se–Ge(Sb).