According to the principal of entropy increase, it's easier to form more disordered crystal strcuture at low temperature. Do I mixed up the concepts of chaos and disorder?
Yes, you have mixed up the concepts of chaos and disorder. In the context of the principle of entropy increase, disorder refers to the number of ways in which the constituent particles or components of a system can be arranged or distributed. It does not refer to chaos in the sense of unpredictability or randomness.
Entropy is a measure of the number of microstates (microscopic arrangements) that correspond to a given macrostate (observable state) of a system. In general, increasing entropy corresponds to increasing disorder, as there are more ways for the particles to be arranged in a disordered state compared to an ordered state.
At low temperatures, it is typically more favorable for a system to adopt an ordered structure, such as a crystal, because the particles can arrange themselves in a regular and organized manner. As the temperature increases, the system gains more thermal energy, and the particles become more mobile, leading to greater disorder and a decrease in the degree of ordering, which is why many materials melt and lose their crystalline structure at higher temperatures.
Chaos, on the other hand, refers to a complex, unpredictable behavior that can arise in certain dynamic systems, often characterized by sensitivity to initial conditions. Chaos theory is a field of study that deals with such systems, but it is distinct from the concept of disorder as used in the context of entropy.