Publikace detail

Thermodynamic model and viscosity of Ge-S glasses

Autoři: Chovanec Jozef | Chromcikova Maria | Liska Marek | Shánělová Jana | Málek Jiří

Rok: 2014

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Thermal Analysis and Calorimetry

Název nakladatele: Springer

Strana od-do: 581-588

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Termodynamický model a viskozita Ge-S skel	Vztah mezi strukturou a viskozitou skel systému Ge-S v rozmezí složení 30-44 at.% Ge byl studován. Pomocí termodynamického modelu bylo nalezeno optimální složení strukturních jednotek v tavenině pro daná složení a teploty. Následně byly stanoveny parametry viskozitních závislostí na základě těchto strukturních jednotek.	viskozita; termodynamický model; chalkogenidová skla
eng	Thermodynamic model and viscosity of Ge-S glasses	The structure-viscosity relationship of GexS(1-x) (x = 0.30, 0.32, 0.33, 0.333, 0.34, 0.36, 0.38, 0.40, 0.42, and 0.44) glass melts was studied. The structure of studied glass melts was described by the thermodynamic model of Shakhmatkin and Vedishcheva. Thermodynamic modeling resulted in four components with significant abundance in the studied glasses, i.e., Ge, S, GeS, and GeS2. The results of thermodynamic model allowed interpretation of compositional dependence of T (g) in form of linear function of equilibrium molar amounts of system components. The experimental viscosity data were alternatively described by various commonly used viscosity equations-Adam and Gibbs, Avramov and Milchev, and MYEGA. The compositional dependence of parameters of the above viscosity equations was described by multilinear formulas with independent variables alternatively defined as the total molar fractions of Ge and S in glass, and the equilibrium molar amounts of components of the thermodynamic model. The statistical analysis of the nonlinear regression results was performed and only the statistically significant members were retained in the multilinear forms. The assumption of composition-independent high temperature-viscosity limit was checked for all used viscosity equations. It was found that statistically more robust description of experimental data is obtained for the compositional-dependent quantity. Simultaneously it was proved that the experimental viscosity data were better described by the equilibrium molar amounts of the thermodynamic model than by the overall elemental glass composition. The obtained results confirmed the structural information acquired from the thermodynamic model.	Viscosity; Thermodynamic model; Chalcogenide glasses

Vyhledávání

Přihlášení pro studenty

Přihlášení pro zaměstnance

Publikace detail

Katedry

Ústavy a pracoviště

Jak nás najdete?

Služby

Často hledáte