Observation of Ferroelectric Domain Structure in TGS

Triglycine sulfate (TGS) is one of the most intensively investigated ferroelectrics. Though the domain structure is an important subject in the research of ferroelectricity, the domain in TGS is invisible by usual optical method. Many substitutive methods have been developed for the observation of static and dynamic domain structure in TGS. This review summarizes these methods mainly from a practical point of view. The methods referred here are the etching method, the powder deposition technique, the decoration method, the nematic liquid crystal (NLC) method, the scanning electron microscopy (SEM), the pyroelectric probe technique (PPT), the X-ray diffraction microscopy, the cleavage method, the scanning probe microscopy (SPM) and others.