Viscosity of Se–Te glass-forming system

Košťál, Petr; Málek, Jiřı́

doi:10.1515/pac-2014-0901

Cited by 19 publications

(8 citation statements)

References 27 publications

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“…Figures 14–16 show these correlations for the same glass-forming systems as in the case of T 12 . We discussed in our previous work [86], and also mentioned in the present text, that the determination of the fragility value can be complicated and less accurate than the determination of T 12 . We chose the F 3/4 fragility parameter defined by Equation (13) for our correlations.…”

Section: Interpretations Of Viscosity Datamentioning

confidence: 89%

“…Dotted lines represent the typical strong and fragile liquid behaviours. Data for SiO 2 (□) [26], o-terphenyl (○) [26], As 2 Se 3 (●) (VFT fit of the experimental data [9,104,129,133,169,178–181,232]) and Se 90 Te 10 (▪) [86,161] are plotted in the figure. The determination of the reduced temperatures ( T 12 / T ) 1/2 and ( T 12 / T ) 3/4 are illustrated. …”

Section: Fragility Conceptmentioning

confidence: 99%

“…Hence, the obtained value of the steepness index can be dependent on the used fitting model or region of experimental data considered in the fit. For more details, see our previous work [86].…”

Section: Fragility Conceptmentioning

confidence: 99%

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Viscosity of chalcogenide glass-formers

Košťál

Shánělová

Málek

2019

International Materials Reviews

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Chalcogenide glass-formers are being used in a remarkable range of various optoelectronic, photonics, photoconducting, sensing and memory device applications. The knowledge of viscosity is essential for the processing of any glass-forming material, in particular for the fabrication of precise optical elements, which is the main application field of chalcogenide glasses. This work presents an extensive collection of all available viscosity data for chalcogenides, including the measurement methods. The Mauro-Yue-Ellison-Gupta-Allan (MYEGA), Arrhenius and VFT equations are used to fit the temperature dependences of viscosity. The viscosity glass transition temperatures, fragilities and apparent activation energies are calculated from these fits. Consequently, these parameters are discussed with regard to the compositional evolution of the respective chalcogenide systems.

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Section: Interpretations Of Viscosity Datamentioning

confidence: 89%

Section: Fragility Conceptmentioning

confidence: 99%

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Viscosity of chalcogenide glass-formers

Košťál

Shánělová

Málek

2019

International Materials Reviews

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“…Following this work, the viscosity data of other glass compositions are further validated through this modified Eyring model. The viscosity data of different glasses were collected, including borate [41], silicate [42], borosilicate glasses [43], anorthite and diopside [28], chalcogenide system Se-Te [44], and metallic liquid [45]. The calculated data are shown in Figure 4 with a good fit to viscosity-temperature data of these amorphous materials.…”

Section: Calculationmentioning

confidence: 98%

A Novel Viscosity-Temperature Model of Glass-Forming Liquids by Modifying the Eyring Viscosity Equation

et al. 2020

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Many models have been created and attempted to describe the temperature-dependent viscosity of glass-forming liquids, which is the foundational feature to lay out the mechanism of obtaining desired glass properties. Most viscosity models were generated along with several impact factors. The complex compositions of commercial glasses raise challenges to settle these parameters. Usually, this issue will lead to unsatisfactory predicted results when fitted to a real viscosity profile. In fact, the introduction of the reliable viscosity-temperature data to viscosity equations is an effective approach to obtain the accurate parameters. In this paper, the Eyring viscosity equation, which is widely adopted for molecular and polymer liquids, was applied in this case to calculate the viscosity of glass materials. On the basis of the linear variation of molar volume with temperature during glass cooling, a modified temperature-dependent Eyring viscosity equation was derived with a distinguished mathematical expression. By means of combining high-temperature viscosity data and the glass transition temperature (Tg), nonlinear regression analysis was employed to obtain the accurate parameters of the equation. In addition, we have demonstrated that the different regression methods exert a great effect on the final prediction results. The viscosity of a series of glasses across a wide temperature range was accurately predicted via the optimal regression method, which was further used to verify the reliability of the modified Eyring equation.

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“…Arrhenius type equation can be also rewritten to a form containing two other parameters, kinetic fragility (m) and T12 corresponding to a temperature at which viscosity value reaches 10 12 Pa•s [35].…”

Section: Viscositymentioning

confidence: 99%

Analysis of crystal growth and viscosity in Ge-Sb-Se-Te undercooled melts

Barták

Košťál

Málek

2019

Journal of Non-Crystalline Solids

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A comprehensive analysis on crystal growth and viscosity is presented for the Ge2Sb2Se5-xTex (x = 0.5 and 1) undercooled melts in this article. Temperature dependence of the measured viscosities (10 7.5 -10 12.5 Pa•s) can be described by a simple exponential Arrhenius type equation in the relatively narrow temperature region in which the measurements were performed. Fragility of the measured materials are all roughly equal to 43, which means that these materials belong to the so called "intermediate" liquids (lying in the middle between strong and fragile liquids) and cannot be described by simple Arrhenius type equation if the temperature region is expanded from glass transition to melting, which is important for description of crystal growth. Therefore, MYEGA equation is used to extrapolate the viscosity data into the temperature region of studied crystal growth. Nucleation and crystal growth started on a surface of studied samples. The isothermal growth rate of the formed surface crystalline layer was measured at various temperatures. Analysis of the growth data revealed a crystal growth driven by liquid-crystal interface kinetics. Therefore, the standard crystal growth models were used for description of crystal growth rates in the studied systems.

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Viscosity of Se–Te glass-forming system

Cited by 19 publications

References 27 publications

Viscosity of chalcogenide glass-formers

Viscosity of chalcogenide glass-formers

A Novel Viscosity-Temperature Model of Glass-Forming Liquids by Modifying the Eyring Viscosity Equation

Analysis of crystal growth and viscosity in Ge-Sb-Se-Te undercooled melts

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