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Polymorphic solids of the same chemical composition can have different atomicstructures; in each polymorph atoms vibrate around a local potential energyminimum (LPEM). If transformations to other structures have sufficiently highenthalpy barriers, then each polymorph is either stable or metastable; it isstationary and does not spontaneously change with time. But what happens, ifthose barriers are low? As examples, we consider NiTi shape memory alloyexhibiting a large elastocaloric effect, and selected elemental solids. Wesuggest a model for dynamically polymorphic solids, where multiple LPEMs arevisited by ergodic motion of a single atom. We predict that upon cooling adynamically polymorphic phase should undergo a symmetry-breaking first-orderphase transition, accompanied by a finite change of the lattice entropy. Wediscuss 3 methods used to calculate phonons in solids with non-harmonic dimpledatomic potentials, and compare theoretical predictions to experiment.

Atomic motion in solids with dimpled potentials