25 Result(s)
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Article
Jiří Málek
Polymer Sciences
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Article
The effect of partial crystallinity on Se70Te30 crystallization kinetics
The effect of partial crystallinity on Se70Te30 crystallization kinetics was investigated in dependence on experimental conditions of the measurement (applied heating rate and particle size of the powdered materi...
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Article
Importance of proper baseline identification for the subsequent kinetic analysis of derivative kinetic data
Using theoretically simulated kinetic datasets, the performance of various types of commonly accessible baselines was tested when the heat capacity of reactants and products is not the same. The quality of the...
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Article
Non-isothermal crystallization kinetics of GeTe4 infrared glass
Non-isothermal crystallization kinetics of the GeTe4 chalcogenide glass was studied in dependence on particle size. Complexity of the obtained DSC data was treated by means of the Fraser–Suzuki deconvolution, and...
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Article
The effect of Se ↔ Te substitution on crystallisation micro-mechanisms evincing in GeTe4 glass
Isothermal and non-isothermal crystallisation behaviour of the GeTe3.9Se0.1 chalcogenide glass was studied dependent on particle size and compared to the similar DSC study performed for the pure GeTe4 material. T...
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Study of nucleation in a Se90Te10 chalcogenide glass by microscopy and differential scanning calorimetry
The Se90Te10 alloy readily forms a stable chalcogenide glass that has widely documented applications. In this work, the nucleation behavior of Se90Te10 was studied by infrared microscopy as well as by differentia...
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Article
Crystallization kinetics of a-Se
Differential scanning calorimetry was used to study crystallization behavior in selenium glass under isothermal conditions. In the current work, which is the third in a sequence of articles dealing with the cr...
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Crystallization mechanisms occurring in the Se–Te glassy system
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 mechani...
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Crystal growth kinetics in GeS2 amorphous thin films
The crystal growth kinetics of germanium disulfide in undercooled melts has been studied by optical microscopy under isothermal conditions. The linear growth kinetics of GeS2 has been observed in the temperature ...
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Article
Amorphous-to-crystalline transition in Te-doped Ge2Sb2Se5 glass
Differential scanning calorimetry (DSC) was used to study crystallization in Ge2Sb2Se4.5Te0.5 glass under non-isothermal conditions. The crystallization kinetics was described in terms of the autocatalytic Šesták...
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Article
Thermodynamic model and viscosity of Ge–S glasses
The structure–viscosity relationship of GexS(1−x) (x = 0.30, 0.32, 0.33, 0.333, 0.34, 0.36, 0.38, 0.40, 0.42, and 0.44) glass melts was studied. The structure of studied glass melts was described by the thermodyn...
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Article
Is the original Kissinger equation obsolete today?
The original Kissinger, Friedman, and modified Kissinger–Akahira–Sunose (KAS) methodologies were used to evaluate the apparent activation energy of theoretically simulated complex processes consisting of two o...
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Article
Crystallization kinetics of a-Se
Differential scanning calorimetry was used to study crystallization behavior in selenium glass under non-isothermal conditions. In the current work, which is the second in a sequence of articles dealing with c...
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As2Se3 melt crystallization studied by quadratic approximation of nucleation and growth rate temperature dependence
The constant heating rate crystallization of As2Se3 undercooled melt was measured by the differential scanning calorimetry. The nonlinear regression analysis of conversion temperature dependence was performed in ...
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Article
Crystallization kinetics of amorphous Se
Differential scanning calorimetry was used to study crystallization behavior in selenium glass under non-isothermal conditions. The crystallization kinetics were described in terms of the Johnson–Mehl–Avrami n...
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Article
Kissinger equation versus glass transition phenomenology
The applicability of the Kissinger equation for the evaluation of apparent activation energy corresponding to glass transition kinetics is examined. Theoretically simulated data based on the generally accepted...
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Article
The Ozawa’s generalized time concept and YZ-master plots as a convenient tool for kinetic analysis of complex processes
The concept of generalized time \( \theta = \int {{ \exp }\left( { - E_{\text{a}} /RT} \right){\text{d}}t} \) ...
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Article
Enthalpy relaxation in Ge–Se glassy system
Differential scanning calorimetry measurements were used to study enthalpic structural relaxation in the GeySe(100 − y) glassy system. The examined compositional range was 0 ≤ y ≤ 15. Based on the results of both...
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Article
The effect of crystal structure on the thermal reactivity of CL-20 and its C4 bonded explosives (I): thermodynamic properties and decomposition kinetics
The crystal structure, thermal behavior, and decomposition kinetics of ε-CL-20, RS-ε-CL-20, α-CL-20, ε-CL-20/C4, and RS-ε-CL-20/C4 were investigated by nonisothermal FTIR, TG, and DSC techniques. It was found ...
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Article
The effect of crystal structure on the thermal reactivity of CL-20 and its C4-bonded explosives
The critical temperature and mechanism functions for thermal decomposition of ε-CL-20, RS-ε-CL-20, α-CL-20, ε-CL-20/C4, and RS-ε-CL-20/C4 were evaluated based on non-isothermal TG data. A two-step mechanism ha...
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Article
Applicability of Fraser–Suzuki function in kinetic analysis of complex crystallization processes
A modified peak-deconvolution procedure for complex crystallization processes was introduced. The method is based on the constrained curve-fitting technique using the Fraser–Suzuki (FS) function, where the FS ...
