Apparent activation energy of structural relaxation for Se70Te30 glass

Svoboda, Roman; Honcová, Pavla; Málek, Jiřı́

doi:10.1016/j.jnoncrysol.2009.12.002

Cited by 27 publications

(9 citation statements)

References 17 publications

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“…The enthalpic TNM parameters found for pure selenium and already published in our earlier work [11] were for the reasons of further comparison also included in the table. Measurements on Te 30 Se 70 were reduplicated within the framework of this article and almost perfectly match our previous results on this material [12]. Quality of the fit is for Te 30 Se 70 demonstrated in Figs.…”

Section: Thermal Characterizationsupporting

confidence: 85%

Enthalpic structural relaxation in Te-Se glassy system

Svoboda

Honcová

Málek

2011

Journal of Non-Crystalline Solids

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Section: Thermal Characterizationsupporting

confidence: 85%

Enthalpic structural relaxation in Te-Se glassy system

Svoboda

Honcová

Málek

2011

Journal of Non-Crystalline Solids

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“…They concluded that the activation energy of viscous flow in the glass transition region is identical with the effective activation energy for relaxation process. The activation energy of structural relaxation for Se 70 Te 30 glass has been calculated theoretically as well as experimentally by Svoboda et al [10]. They have pointed out that the activation energy deduced from classic and intrinsic cycles is close to that obtained from curve-fitting.…”

Section: Introductionmentioning

confidence: 77%

“…Therefore, the change in the aforementioned physical quantities with temperature and time during use, in the direction toward their equilibrium values, is usually accompanied by molecular rearrangement and is inevitable process. Such a structural relaxation process is known as physical ageing and is reported to occur in polymers [4], metallic [5][6][7] and chalcogenide glasses [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Structural relaxation due to sub-Tg annealing of Se98In1.5Sn0.5 chalcogenide glass

Imran

Al-Shawabkeh

2010

Journal of Alloys and Compounds

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Section: ■ Introductionmentioning

confidence: 99%

“…Structural relaxation in Se-rich bulk glasses was studied using differential scanning calorimetry (DSC). 16,17 Different experimental techniques (DSC, microscopy, electrical measurements, in situ X-ray diffraction) were used to study crystallization behavior in bulk glasses 18−26 and thin films 27−29 of the Se−Te system.In this article, the crystal growth in Se 100−x Te x (x = 10, 20, and 30) bulk glasses was studied directly by infrared microscopy. The crystal growth data are combined with viscosity and heat capacity data to obtain an appropriate crystal growth model and to predict the crystal growth behavior in a wide temperature range.…”

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confidence: 99%

Crystal Growth Kinetics in Se–Te Bulk Glasses

Barták

Martinková

Málek

2015

Crystal Growth & Design

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The isothermal crystal growth in Se 100−x Te x bulk glasses (x = 10, 20, and 30) was studied directly using infrared microscopy. The crystals grew spherulitically and linearly in the course of time, which is typical for crystal growth controlled by liquid-crystal interface kinetics. An operative growth model was found using a combination of growth and viscosity data, and using two different approaches for calculations of the Gibbs free energy change between the undercooled melt and crystalline phase. The study shows that the exact knowledge of the Gibbs free energy change calculated from both, heat capacities, and the simple approximation proposed by Turnbull, can provide comparable results regarding determination of an operative crystal growth model. A detailed discussion about the relationship between the kinetic coefficient of crystal growth rate and viscosity (u kin ∝ η −ξ ) is presented. Moreover, the activation energies of crystal growth were found to be higher than the activation energies of the overall crystallization process obtained by differential scanning calorimetry. The relation between these two quantities is considered under the experimental conditions. ■ INTRODUCTIONChalcogenide glasses and thin films are very interesting materials that exhibit unique physical properties. Because of their diverse active properties, chalcogenide materials can be used in various optical and optoelectronical devices or in various electronic thresholds and switches. 1−3 Interesting applications of chalcogenide materials also are found in modern high-tech memory devices. 4−6 Thermal stability and crystallization play a key role in processing and usage of the materials. In particular, the crystallization process needs to be considered from two points of viewin order to obtain an ideal glass the crystallization has to be prevented, and, on the other hand, the controlled amorphous-to-crystalline transformation is a fundamental process of considered technology (modern phase change materials, PCM). Thus, knowledge and understanding of crystal growth kinetics and nucleation in such materials are essential for their future applications. The crystallization studies 7−11 focus on evaluation of mechanism of crystal growth and nucleation, and on prediction of crystallization behavior in a wide temperature range. Such a description can be useful for tailoring and optimization of new high-tech materials as they provide a possibility to predict the crystallization behavior in similar materials by revealing the basic mechanisms and properties of the material.Selenium-based materials have been commercially applied in photoreceptors, photovoltaic materials, etc. 12 The properties of pure selenium can be significantly improved by alloying with other elements such as tellurium, germanium, antimony, arsenic, etc. Se−Te glasses and thin films are very attractive materials that exhibit an intermediate behavior between pure selenium and tellurium. The Se−Te mixtures exhibit numerous advantages in comparison with pure Se, for example, great...

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Apparent activation energy of structural relaxation for Se70Te30 glass

Cited by 27 publications

References 17 publications

Enthalpic structural relaxation in Te-Se glassy system

Enthalpic structural relaxation in Te-Se glassy system

Structural relaxation due to sub-Tg annealing of Se98In1.5Sn0.5 chalcogenide glass

Crystal Growth Kinetics in Se–Te Bulk Glasses

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