Vidros: sólidos ou líquidos? Uma análise via simulação computacional
Resumen
For many centuries there were different definitions of what glass would be, this discussion
persists to current days. Is glass a solid or liquid material? In this work, we answer this question
through computational simulations of the main properties of the crystalline solid, liquid and
glass materials, comparing its behavior and results. We studied four types of materials models,
silicon (Si), zirconium (Zr), silica (SiO 2 ) and alloy of Zr 50 Cu 50 . We have shown that there is a
physical change in the process of between the supercooled liquid and the glass, which relates
the high viscosity that the glass has with the relaxation time. Based on our results, we affirm
that glass does not is a solid nor a liquid, it is a state of matter unique and we create a new
definition for it: Glass, within a human time scale, is a physical states of matter with a globally
amorphous structure, containing nuclei organized at medium atomic distances throughout the
material. It has a temperature called the glass transition, where ergodicity is broken kinetically.
Below this temperature, the relaxation time and viscosity increase infinitely, giving the material
mechanical rigidity. This state of matter is not thermodynamically stable, which causes it to
relax spontaneously over time, with the crystal as its final destination over a very large time
limit.
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