X-ray Plane-Wave Topography for Use in the Study of Domain Structure of Rochelle Salt

Domain structure of Rochelle salt has been studied by X-ray plane-wave topography. Fine stripe patterns of domain boundaries are found in topographs of a-plates in ferroelectric state. These patterns are caused by strains near the boundary, due to atomic displacements parallel to the boundary. For c-plates, separate three topographs have been obtained for three incident angles corresponding to three peaks in the rocking curve due to c-domain and to two sets of crystal orientation in b-domain.