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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F20%3A39916493" target="_blank" >RIV/00216275:25310/20:39916493 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0022459620304291?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0022459620304291?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jssc.2020.121599" target="_blank" >10.1016/j.jssc.2020.121599</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Solid State Chemistry

ISSN

0022-4596

e-ISSN

—

Svazek periodika

291

Číslo periodika v rámci svazku

November

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

121599

Kód UT WoS článku

000574668600012

EID výsledku v databázi Scopus

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