Symmetry analysis of domain structure in KSCN crystals

Basic symmetry properties of domain states, domain pairs, domain twins and walls in KSCN crystals are examined by group theoretical methods. Relations between domain states and domain pairs are expressed in matrix form and by permutation representation. Black and white space groups describing the symmetry of domain pairs are found and layer group symmetries of domain twins and domain walls are determined as their sectional subgroups. Microscopic structures of domain walls are given for coherent ferroelastic walls and for translation (antiphase) walls. Exposition and obtained results provide an illustrative example of symmetry analysis of domain structures.