研究目的
To summarize previously published data on viscosity behavior of chalcogenide glass-forming systems along with a brief description of current measuring methods.
研究成果
The work provides the most extensive collection of experimental viscosity data for chalcogenide glass-formers, covering 36 pure chalcogenides, 262 binary, 265 ternary, and 33 multi-component systems. The VFT, MYEGA, and Ojovan equations are compared, showing that none perfectly describe the data, highlighting the complexity of viscous flow. Correlations between viscosity parameters and structural properties are discussed, but predictability is limited due to the intricate nature of viscosity behavior.
研究不足
The measurements are complicated by long relaxation times at high viscosities, cold crystallization in undercooled melt regions, volatility of chalcogenides, and potential inhomogeneities in temperature. The applicability of viscosity theories is not universal, and extrapolations can lead to errors. Some data are from hard-to-access sources, and there are discrepancies between different studies.
1：Experimental Design and Method Selection:
The paper reviews various experimental methods for viscosity measurement, including capillary method, falling sphere method, rotating method, torsion oscillating cup method, rod elongation method, penetration method, parallel-plate method, beam-bending method, low-temperature torsion method, Eisenberg-Tobolsky method, and magnetic bearing torsional creep method. It discusses the theoretical basis and applicability of each method for chalcogenide systems.
2：Sample Selection and Data Sources:
The viscosity data are collected from literature for chalcogenide systems based on sulfur, selenium, and tellurium, including pure chalcogens, binary, ternary, and multi-component compositions. Data are sourced from published works, with compositions expressed in atomic percents or established formulae.
3：List of Experimental Equipment and Materials:
Specific equipment models and brands are not detailed; methods are described generically (e.g., capillary tubes, falling spheres, rotating viscometers). Materials include various chalcogenide glasses and melts.
4：Experimental Procedures and Operational Workflow:
Procedures involve measuring viscosity under controlled temperature and pressure conditions, with attention to issues like crystallization, volatility, and shear thinning. Methods are applied in isothermal or non-isothermal regimes as appropriate.
5：Data Analysis Methods:
Viscosity data are fitted using MYEGA, Arrhenius, and VFT equations. Parameters such as logη0, fragility m, T12, Eη/R or B, and T0 are calculated. Statistical criteria like determination coefficients and Akaike information criteria are used to evaluate fits.
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