Theoretical investigation of the ferroelastic domain structure in cesium lead chloride in the monoclinic phase

Abstract

The ferroelastic domain structure of CsPbCl3, in its monoclinic phase, is analyzed by two theories: group symmetry and tensor method, or twinning by pseudo-symmetry. The loss of symmetry between the prototypic and the monoclinic phases is important and allows the existence of twelve kinds of domains. Theories provide a coherent description of domain pairs and a determination of the position of W and S walls.