Login for students

Login for employees

Publication detail

Thermodynamic model and viscosity of Ge-S glasses
Authors: Chovanec Jozef | Chromcikova Maria | Liska Marek | Shánělová Jana | Málek Jiří
Year: 2014
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Page from-to: 581-588
Titles:
Language Name Abstract Keywords
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

Departments

Other Parts

Map

en.mapy.cz

Services

Popular Links

© 2023 University of Pardubice, Studentská 95, 532 10 Pardubice 2
Phone: +420 466 036 111, 466 036 112, 466 036 113
Webmaster, RSS
Data box ID: f5vj9hu
Accessibility Statement
CC BY-NC-ND 4.0Creative CommonsAttributionNonCommercialNoDerivatives