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- W3208284773 abstract "Optical properties (refractive index n, optical bandgap Ego, slope of fundamental absorption edge <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$W$</tex> ) and density of Ge <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>x</inf> As <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>y</inf> Se <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>100-x-y</inf> ( <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$0 leq mathrm{x} leq 30; 10 leq mathrm{y}leq 40$</tex> ) chalcogenide glasses were studied at room temperature. The molar refraction of glasses was calculated using the Lorentz-Lorenz formula, and the ionicity of possible chemical bonds was estimated. The results were analyzed depending on the mean coordination number <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$langle (mrangle (langle mrangle = 2 + 0.01 (2mathrm{x}+mathrm{y})$</tex> for GexAsySe100-x-y glasses). A different character of the dependences of all investigated physical properties on <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$langle mrangle$</tex> was established in the ranges <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$2.1leqlangle mrangleleq 2.78$</tex> and <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$2.78 leq langle mrangle leq 3$</tex> , which may indicate a qualitatively different structure of the corresponding glasses. Glasses of the first group can be classified as molecular solids, which are characterized by a significant van der Waals interaction, which is carried out mainly by lone-pair electrons of As and Se atoms. At <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$langle mrangleapprox 2.78$</tex> , a structural phase transition to a continuous three-dimensional glassy network was observed, accompanied by a qualitative rearrangement of the band structure of the alloys." @default.
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- W3208284773 date "2021-09-13" @default.
- W3208284773 modified "2023-10-01" @default.
- W3208284773 title "Structural Phase Transition in Glasses GexAsySe100-x-y" @default.
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- W3208284773 doi "https://doi.org/10.1109/khpiweek53812.2021.9570004" @default.
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