10.1007/s10973-006-8228-4 |
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Authors: | L Stoch P Stoch |
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Institution: | (1) Faculty of Materials Science and Ceramics, AGH-University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland |
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Abstract: | The high-resolution
transmission electron microscopy HRTEM study of the atomic scale mechanism
of crystal structure organization within the amorphous polymeric structure
of the model multicomponent glass TiO2–MgO–Al2O3–SiO2– in the glass transformation temperature range has been
undertaken. In the glass transition (T
g)
temperature range, glass transforms from the solid of rigid amorphous structure
into viscoelastic state of weakened chemical bonds. This is an example of
nuclei formation and crystal growth in the polymeric amorphous structure of
low atomic scale homogeneity due to middle range ordering. It has been demonstrated
that in this case crystal structure formation proceeds by successive displacement
and local ordering of atoms in the amorphous structure, like disorder-order
transformation in crystalline solid bodies. As the consequence in the crystallization
by parent structure reorganization mechanism, traditional model of glass crystallization
as well as kinetic models of reactions in solid bodies according Avrami or
others, are worthy to be revised. |
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Keywords: | |
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