Reason why in many metals, we find the phase with a relatively closely packed structure is stable at a lower temperature, whereas a relatively loosely packed structure is stable at higher temperature?

Reason why in many metals, we find the phase with a relatively closely packed structure is stable at a lower temperature, whereas a relatively loosely packed structure is stable at higher temperature? Correct Answer Entropy term

The increasing importance of the entropy term that is –TS is the reason behind the stability of closely packed structure at relatively low temperature and as the temperature increases the entropy term increases because of increase in T hence the randomness increases and hence the movement of individual particle increases which creates a kind of instability in closely packed structure at high temperature.