Comparative Investigation of Se–Te–M (M = Sb, Ge) Semiconducting Glassy Alloys: Thermal Characterization

2020 ◽  
Vol 12 (1) ◽  
pp. 65-69
Author(s):  
Vandita Rao ◽  
H. P. Pathak ◽  
Pooja Lohia ◽  
D. K. Dwivedi
Keyword(s):  
Activation Energy ◽  
Glass Transition ◽  
Crystallization Kinetic ◽  
Thermal Characterization ◽  
Comparative Investigation ◽  
Glassy Alloys ◽  
Activation Energy Of Crystallization ◽  
Thermal Measurements ◽  
Kinetics Of ◽  
Change Memory

Structural and thermal measurements have been performed in glassy Se78Te18M4 (M = Sb and Ge) alloys to study the effect of Sb and Ge additives on the kinetics of glass transition and crystallization. Kinetic parameters of glass transition and crystallization such as the activation energy of glass transition (Eg), the activation energy of crystallization (Ec) have been determined using different non-isothermal methods. It was found that Ge was more suitable dopant for phase change memory (PCM) devices due to its low activation energies as compared to Sb dopant.

Non-Isothermal Crystallization Kinetics of Mg61Zn35Ca4 Glassy Alloy

2017 ◽  
Vol 898 ◽  
pp. 657-665
Author(s):  
Dao Zhang ◽  
Wang Shu Lu ◽  
Xiao Yan Wang ◽  
Sen Yang
Keyword(s):  
Activation Energy ◽  
Crystallization Kinetics ◽  
Isothermal Crystallization ◽  
Melt Spinning ◽  
Glassy Alloy ◽  
Heating Rates ◽  
Isothermal Crystallization Kinetics ◽  
Complex Process ◽  
Activation Energy Of Crystallization ◽  
Kinetics Of

The non-isothermal crystallization kinetics of Mg61Zn35Ca4 glassy alloy prepared via melt-spinning were studied by using isoconversion method. The crystalline characterization of Mg61Zn35Ca4 was examined by X-ray diffraction. Different scanning calorimeter was used to investigate the non-isothermal crystallization kinetics at different heating rates (3-60 K/min). The calculated value of Avrami exponent obtained by Matusita method indicated that the crystalline transformation for Mg61Zn35Ca4 is a complex process of nucleation and growth. The Kissinger-Akahira-Sunose method was used to investigate the activation energy. The activation energy of crystallization varies with the extent of crystallization and hence with temperature. The Sestak-Berggren model was used to describe the non-isothermal crystallization kinetics.

Crystallization Kinetics in Cu64.5Zr35.5 Binary Metallic Glass

2017 ◽  
Vol 727 ◽  
pp. 233-238 ◽  
Author(s):  
Qian Gao ◽  
Zeng Yun Jian ◽  
Jun Feng Xu ◽  
Man Zhu
Keyword(s):  
Activation Energy ◽  
Grain Growth ◽  
Crystallization Kinetics ◽  
Crystallization Process ◽  
Crystallization Kinetic ◽  
Heating Rates ◽  
Scanning Calorimetry ◽  
Growth Activation ◽  
Local Activation Energy ◽  
Kinetics Of

The crystallization kinetics of melt-spun Cu64.5Zr35.5 amorphous alloy ribbons was investigated using differential scanning calorimetry (DSC) at different heating rates. Besides, the Kissinger and isoconversional approaches were used to obtain the crystallization kinetic parameters. As shown in the results, the activation energies for glass transition and crystallization process at the onset, peak and end crystallization temperatures were obtained by means of Kissinger equation to be 577.65 ± 34, 539.86 ± 54, 518.25 ± 20 and 224.84 ± 2 kJ/mol, respectively. The nucleation activation energy Enucleation is greater than grain growth activation energy Egrowth, indicating that the nucleation process is harder than grain growth. The local activation energy Eα decreases in the whole crystallization process, which suggests that crystallization process is increasingly easy.

scholarly journals Kinetics of crystallization of Ge30-xSe70Sbx (x=15, 20, 25) chalcogenide glasses

2014 ◽  
Vol 8 (1) ◽  
pp. 25-30 ◽  
Author(s):  
Anusaiya Kaswan ◽  
Vandana Kumari ◽  
Dinesh Patidar ◽  
Narendra Saxena ◽  
Kananbala Sharma
Keyword(s):  
Activation Energy ◽  
Energy Barrier ◽  
Chalcogenide Glasses ◽  
Frequency Factor ◽  
Heating Rates ◽  
Kinetics Of Crystallization ◽  
Theoretical Approaches ◽  
Activation Energy Of Crystallization ◽  
Ozawa Model ◽  
Kinetics Of

The kinetics of crystallization of Ge30-xSe70Sbx (x=15, 20, 25) chalcogenide glasses has been investigated using differential scanning calorimetery at different heating rates under non-isothermal conditions. The kinetic analysis of crystallization has been discussed using different theoretical approaches such as Ozawa model, Augis and Bennet model, Matusita model and Gao-Wang model. It is evident from this study that the activation energy of crystallization Ec is composition dependent. The activation energy decreases with increasing Sb content due to the increasing of rate of crystallization. The minimum value of the frequency factor Ko, which is defined as the number of attempts made by the nuclei per second to overcome the energy barrier, confirms the fact that glass is more stable. It has been found that Ge15Se70Sb15 glass is more stable compared to the other compositions.

Nonisothermal Crystallization Kinetics of HDPE/UHMWPE/n-HA Composites

2011 ◽  
Vol 194-196 ◽  
pp. 2351-2354 ◽  
Author(s):  
Hui Ling Shen ◽  
Na Zhang
Keyword(s):  
Activation Energy ◽  
Scanning Calorimetry ◽  
Nonisothermal Crystallization ◽  
Relative Crystallinity ◽  
Small Deviations ◽  
Linear Portion ◽  
Activation Energy Of Crystallization ◽  
Nonisothermal Crystallization Kinetics ◽  
Avrami Parameter ◽  
Kinetics Of

The influence of compatibilizer and dispersant on the nonisothermal crystallization behavior of HDPE/UHMWPE/HA is investigated here by differential scanning calorimetry (DSC). It has been analyzed by Jeziorny method. For different composites, the Jeziorny plots shows the linear portion. The small deviations from linearity only appear at higher relative crystallinity because of the secondary crystallization. The value of Avrami parameter n is between 2.7 and 3.5. At the same temperature, Zcand Sibecome bigger after adding compatibilier and dispersant while tmax is decreasing. The activation energy of crystallization also have been studied by Kissinger equation. The result shows that the addition of compatibilizer and dispersant can decrease the activation energy. In addition, the compatibilizer and dispersant also improve the mechanical properties of composites.

Study on glass transition temperature and kinetics of Cu–Zr glassy alloys

2017 ◽  
Vol 129 (3) ◽  
pp. 1429-1433 ◽  
Author(s):  
Hui Sun ◽  
Zengyun Jian ◽  
Bingqing Jiang ◽  
Fange Chang ◽  
Qian Gao
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Glassy Alloys ◽  
Kinetics Of
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