Revealing Structural Changes at Glass Transition via Radial Distribution Functionsстатья
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Дата последнего поиска статьи во внешних источниках: 7 июля 2020 г.
Аннотация:Transformation of glasses into liquids is discussed in terms ofconfiguron (broken chemical bond or transformation of an atom from one toanother atomic shell) percolation theory with structural changes caused. The firstsharp diffraction minimum (FSDM) in the pair distribution function (PDF) isshown to contain information on structural changes in amorphous materials at theglass transition temperature (Tg). A method to determine the glass transitiontemperature is proposed based on allocating Tg to the temperature when a sharpkink in FSDM occurs. The method proposed is more sensitive compared withempirical criterion of Wendt−Abraham; e.g., for amorphous Ni the kink thatdetermines Tg is almost twice sharper. Connection between the kink in fictivetemperature behavior of PDF and Wendt−Abraham criterion is discussed.