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Ge30AsxSe70-x bulk glasses from the point of view of chemistry

Autoři: Černošek Zdeněk | Černošková Eva | Todorov R | Holubová Jana

Rok: 2020

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Solid State Chemistry

Název nakladatele: Elsevier Science Inc.

Místo vydání: New York

Strana od-do: 121599

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Objemová skla Ge30AsxSe70-x z pohledu chemie.	U skel Ge30AsxSe70-x byla studována struktua korelována s ternárním fázovým diagramem. Na tomto základě byla vysvětlena oblast sklotvornosti tohoto systému.
eng	Ge30AsxSe70-x bulk glasses from the point of view of chemistry	To elucidate the chemical structure of Ge-As-Se based glasses with selenium substoichiometry, Ge30AsxSe70-x homogeneous bulk glasses were prepared and the glass-forming region was found from x = 0 up to 40. The chemical structure of these glasses was characterized by basic structural units. The structure of Ge30Se70 (x = 0) glass is based on GeSe4/2 and GeSe4 structural units and traces of selenium. When selenium is gradually replaced with arsenic AsSe3/2 and Ge(II)As(2/3 )structural units appear in the equimolar ratio with gradually increasing concentrations at the expense of the units with Ge-Se bonds. Finally, for x = 40 the glass is formed exclusively by structural units AsSe3/2 and GeAs2/3. Thus, the structure of both border glasses is based only on two structural units whereas other glasses are based on four units. For this reason, the undercooled melts of both border glasses are less stable and undergo crystallization when heated. In terms of the geometry of the basic structures, the structure for x = 0 is formed solely by tetrahedral units with germanium as the central atom, and then is gradually transformed with increasing concentration of arsenic to a structure consisting only of trigonal pyramids with arsenic as a central atom.	Chalcogenide glass; Chemical structure; Raman spectroscopy; Se-77 MAS NMR; 2D correlation spectroscopy; Thermal analysis

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