Abstract
We briefly survey the application of symmetry-related concepts to the structural phase transitions observed in crystals. The unifying concept of ferroicity which includes ferroelectricity, ferroelasticity, and similar phenomena is considered first. It is related to a modification in point symmetry. The frequent occurrence of ferroelastic transitions among observed phase transformations is pointed out. In particular, we underline the connection which exists between ferroelasticity and certain martensitic transformations in metallic alloys as well as with the cooperative Jahn-Teller transitions. The concepts of proper and improper ferroic transitions are then qualitatively introduced. They are related to the space-symmetry change and to the subsequent symmetry properties of the transitions's order parameter. The main differences between proper and improper ferroics are described.
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