Abstract
The recent research work on domain structures and their dynamics in ferroelastic and ferroelectric crystals by white-beam synchrotron radiation topography is summarized. The real-time imaging, fine-beam Laue diffraction, and anomalous-scattering topography were carried out to the study of the domain structures and phase transition in the ferroelastic NdP5O14 and LaP5O14, and ferroelectric KTa1-xNbxO3, (Ba0.25Sr0.75)0.9(K0.5Na0.5)0.2Nb2O6, and KTiOPO4 crystals. Some preliminary results are presented and discussed.