Relationship between crystal growth and surface/volume mobilities in Se95Te5 bulk glasses and thin films

Martinková, Simona; Valdés, Diego; Šlang, Stanislav; Pálka, Karel; Barták, Jaroslav

doi:10.1016/j.actamat.2021.116953

Cited by 4 publications

(2 citation statements)

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“…Despite the numerous contributions regarding the crystallization in chalcogenide glasses, absolute majority of these papers deals only with the macroscopic manifestation of the crystal growth recorded by the calorimetric techniques and does not properly explore the microscopic aspect of this process (this is due to the microscopic research having been perceived significantly more tedious in comparison with, e.g., differential scanning calorimetry). Similar state of affairs exists also for the Se–Te chalcogenide glasses, where the high-quality microscopic studies are very scarce − but inconsistent, and do not provide a complex perspective of the interconnection between the macro- and microscopic data. Acquirement of such overall view was enabled only recently, through a break-through advancement in direct combined observation of the calorimetric signal and microscopic insight under exactly similar conditions.…”

Section: Introductionmentioning

confidence: 74%

“…The effectivity of the combined procedure also allows for processing large enough data sets to explore the influences of composition, synthesis, and measurement conditions on the crystal growth kinetics. The general outcomes of the studies, − with regard to the crystal growth in thin Se–Te films, were the sometimes significantly faster growth in the films (compared to the bulk material), and disunity of the explanations thereof. It was shown in ref that in case of the Se thin film it is the physico-chemical quality of the substrate that is absolutely crucial for the rates of the nucleation and growth phenomena.…”

Section: Introductionmentioning

confidence: 99%

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Crystal Growth in Se–Te Chalcogenides: Overview of the Growth/Relaxation/Viscosity Interplay for Bulk Glasses and Thin Films

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et al. 2022

Crystal Growth & Design

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Crystal growth in 1 μm Se(1–y)Te y thin films (for y = 0, 7, 10, and 17) deposited on the Kapton, SiO2 glass, and white glass substrates was researched and quantified by means of a unique combination of direct joint microscopic and calorimetric measurements. As a general feature, the crystal growth in the Se–Te thin films deposited on a Kapton tape was very close to the native/bulk crystal growth. Deposition on the inorganic glassy substrates largely accelerated the crystal growth in the Se–Te thin films due to the build-up of internal tension originating from the large difference in thermal expansion coefficients between the film and the substrate. An additional increase in the crystal growth rate was also caused by the diffusion of Na+ ions from the white glass substrate into the Se–Te films. Almost perfect correspondence was found for the activation energies of crystal growth determined by various measurement techniques (calorimetry and microscopy) and for various Se–Te sample forms (thin films, bulk glass, powdered bulk glass). A very good agreement was found also between the activation energies of viscous flow and structural relaxation at the glass transition temperature T g. At higher temperatures, the Se–Te thin films exhibit a minor-to-moderate breach of the Stokes–Einstein law, as expressed by the value of Ediger’s decoupling parameter ξ ≈ 0.80 ± 0.05. At lower temperatures near the glass transition, the violation of the Stokes–Einstein relation deepens for the thin films with higher Te content. An explanation was proposed based on the potential interconnection between the below-T g relaxation kinetics and above-T g connectivity of the undercooled liquid domains (resulting either in changes of the effective hydrodynamic radius during the self-diffusion or in the tendency to create structural inhomogeneities via thermal fluctuations).

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