If a doped a material in a matrix. Its glass transition temperature and crystallization temperature decreases compared to the matrix but activation energy increases (Kissinger, Moynihan). Please give me the explanation for increased activation energy with decreased Tg and Tc.
I personally have not much experience with crystallization studies, but i suggest studied by professor Vyazovkin, e.g, the most recent one
Article Nonisothermal Crystallization Kinetics by DSC: Practical Overview
to start with. Besides, the general comment on kinetics is that mentioned methods (Kissinger, Moynihan) should be used only for preliminary assessment, the final kinetic models should rely on more advanced kinetic technoques (see the ICTAC Kinetic commitee recommendations)
Best,
NM
The activation energy for crystallization is a thermodynamic concept that represents the energy barrier that must be overcome for a material to transition from a disordered or amorphous state to a crystalline state. This process involves the arrangement of atoms or molecules into an ordered, repeating structure characteristic of crystals.
The relationship between crystallization activation energy and surface area is not straightforward and can depend on various factors. In general, an increased surface area can influence the crystallization process in the following ways:
Overall, the relationship between crystallization activation energy and surface area is complex and depends on various factors, including the specific material, its properties, and the conditions under which crystallization occurs. It's important to consider the entire thermodynamic and kinetic context of the crystallization process when examining the influence of surface area on activation energy.
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