Crystallization kinetics in Se–Te glassy system

Svoboda, Roman; Krbal, Miloš; Málek, Jiřı́

doi:10.1016/j.jnoncrysol.2011.05.002

Cited by 33 publications

(19 citation statements)

References 28 publications

(30 reference statements)

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“…Another very interesting fact is associated with the location of the crystallization peaks with respect to the temperature axis compared for different powder fractions. In the case of batch (a) the peaks show almost no shift in temperature with increasing particle size (which is quite unusual considering the so far observed behavior in the Se-Te glassy system [1][2][3][4][5][6][7]), while for batch (b) the crystallization peaks shift to higher temperatures with increasing grain size.…”

Section: Shapes Of Se 95 Te 5 Crystallization Peaks and Their Interprmentioning

confidence: 54%

“…As can be seen, the data for batch (b) show commonly observed shifts and curvatures with changing temperature and heating rate, which indicate overlapping ''surface''/bulk crystallization mechanism characteristics for Se-Te glasses. Incidentally, based on our other recent results, it seems that the curvatures [1][2][3][4][5][6][7] observed in the Kissinger plot for Se-Te coarse powders and bulks can be associated with the transition between the formation of two types of spherulitic crystallites (hightemperature type A and low-temperature type B) as identified by Ryschenkow and Faivre and Bisault, Ryschenkow, and Faivre [15,16] for amorphous selenium. Considering the framework of the three types of crystallization mechanism occurring in Se-Te glasses, the two above-mentioned microscopic crystal growth patterns fall within the bulk crystallization mechanism originating from randomly dispersed nuclei.…”

Section: Quantitative Kinetic Analysis Versus Process Complexitymentioning

confidence: 68%

“…Experimental details on the preparation and measurements of the Se, Se 90 Te 10 , Se 80 Te 20, and Se 70 Te 30 compositions can be found in the, respective, previously published papers [1][2][3][4][5][6][7]. In addition to these materials, a new glass with Se 95 Te 5 composition was prepared.…”

Section: Methodsmentioning

confidence: 99%

“…Based on the latter, the interpretations introduced for the formerly studied compositions [1][2][3][4][5][6][7] can be extended for Example DSC curves measured for the twoprepared glass batches (data for similar particle size fraction and heating rate are displayed). Zoomed glass transition region is shown in the inset Crystallization mechanisms occurring in the Se-Te glassy system the current Se 95 Te 5 material.…”

Section: Shapes Of Se 95 Te 5 Crystallization Peaks and Their Interprmentioning

confidence: 99%

“…Recently, extensive systematic research dealing with macroscopic crystallization in Se-Te glasses was conducted [1][2][3][4][5][6][7]. Two novel methodologies for treating the crystallization data measured by differential scanning calorimetry (DSC) were developed within the framework of these studies.…”

Section: Introductionmentioning

confidence: 99%

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Crystallization mechanisms occurring in the Se–Te glassy system

Svoboda

Málek

2014

J Therm Anal Calorim

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Crystallization kinetics, studied under non-isothermal conditions in dependence on particle size, is reviewed for the Se-Te glassy system, with particular focus on occurring macroscopic crystallization mechanisms. The observed complexity of the crystallization processes is explained in terms of the two previously identified mechanisms-bulk crystallization originating from nuclei randomly distributed in the volume of each glass particle (formation of these nuclei is consistent with the classical nucleation theory) and crystallization from surface/volume active centers, dislocations, structural defects, and heterogeneities originating from the mechanical damage of the material (e.g., during grinding and milling). In addition, a new crystallization mechanism, previously unobserved in this system, was revealed for hyperquenched Se 95 Te 5 glass. The origin of this mechanism is suggested to be closely associated with the stress-induced defects contained in the highly strained structure of this glass. The strong compositional dependence of the occurrence of this mechanism then seems to be caused by the high cooperativity of the amorphous structure of the specific composition.

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