When a crystalline lattice is under a great deal of tension, i.e., its constituent elements are all pulling away from one another and the force of that pull increases the closer the elements are to one another, it turns out that increasing its energy actually causes it to become more ordered. The more energy you add to the system, the tighter the crystal becomes. A crystal with smaller lattice spacing is more ordered than one with larger spacing, all other things being equal. Therefore, as I add energy to the system, the order increases.
Tim Andersen, Ph.D.