23 Result(s)
-
Article
Crystallization in glasses monitored by thermomechanical analysis
Thermomechanical analysis (TMA) can be used as a sensitive tool to follow crystallization behavior in non-crystalline materials. Newly developed method is based on slowing down of sample deformation caused by ...
-
Article
Crystal growth kinetics of Sb2S3 in Ge–Sb–S amorphous thin films
Sb2S3 crystal growth kinetics in (GeS2) x (Sb2S3)1–x thin films (x = 0.4 and 0.5) have been investigated through this study by optical microscopy in the temperat...
-
Article
40th Anniversary of the establishment of Czech Group for Thermal Analysis
-
Article
Extended study of crystallization kinetics for Se–Te glasses
Crystallization kinetics of chosen compositions from Se–Te glassy system were studied under non-isothermal conditions depending on particle size using differential scanning calorimetry. The purpose of this art...
-
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 ...
-
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 ...
-
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...
-
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...
-
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 \( \theta = \int {{ \exp }\left( { - E_{\text{a}} /RT} \right){\text{d}}t} \) ...
-
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...
-
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...
-
Article
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 ...
-
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...
-
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...
-
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...
-
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...
-
Article
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 ...
-
Article
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...
-
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...
-
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...
