Studies of ferroelastic and ferroelectric domain structure in BSN, KN, KTN, and NPP crystals by synchrotron radiation topography

Abstract

In this paper we deal mainly with the recent research work on domain structures. Ferroelectric and/or ferroelastic domains in barium sodium niobate (Ba₂NaNbO₅), potassium niobate (KNbO₃), potassium niobate-tantalate (KTa_1-xNb_xO₃), and neodymium pentaphosphate (NdP₅O₁₄) have been studied by X-ray Lang and white-beam synchrotron radiation topographies. The in-situ observations of phase transition in Ba₂NaNbO₅ and KNbO₃ were carried out and analyzed. The fine-beam synchrotron radiation Laue diffraction technique was applied to the study of the structure of ferroelastic domain walls in NdP₅O₁₄. Some preliminary results are presented here.