Abstract
We have studied the domain structure in a number of crystals undergoing proper or improper ferroelastic phase transitions of the displacive or order-disorder type. In all cases a regular pattern of domain walls was observed near proper ferroelastic phase transitions, whereas needle or lense shaped domains appeared in the improper ferroelastic phases of the order-disorder type. The observations are explained by the different magnitudes of the attractive force between domain wall junctions.
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