Abstract
The optical bandgap ( E g) and the complex index of refraction ( Ñ) in Ge x Sb 40− x Se 60 glasses are studied by means of spectroscopic ellipsometry in the light wavelength region of 400 to 820 nm. The values of optical bandgap, E g, and complex index of refraction, Ñ, are considered as a function of the average coordination number ( Z) of covalent bonds per atom. Their compositional dependences show changes in the vicinity of Z=2.67, which we associate with the topological phase transition, occurring when the predominantly two-dimensional layer structure (2D) changes to a three-dimensional (3D) network.
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