散漫相転移を示す強誘電体単結晶における動的分域観察 : 組成・構造

概要

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Optical or electron microscopes have been usually used to observe ferroelectric domains. But they have some difficulties in applying an external electric field or in changing the temperature of a sample. A CCD microscope has been developed for the domain observation by combining a low magnification object-lens and a high resolution CCD sensor. The CCD microscope revealed more than × 1000 magnification on a CRT display with a very bright view. Moreover, it is easy to apply an electric field on the sample because of a sufficient distance between the object-lens and the sample. The image of the domain motion is instantaneously recorded with a VTR. Single crystals of the (1-x)Pb(Zn_<l/3>Nb_<2/3>)O_3-xPbTiO_3 system prepared by the flux method were used. This solid solution system exhibits a morphotropic phase boundary between rhombohedral and tetragonal phase near x = 0.1. The phase transition behavior from ferroelectric to paraelectric phase becomes sharp with increasing PbTiO_3 concentration (x) in comparison with a diffused phase transition in Pb(Zn_<l/3>Nb_<2/3>)O_3. Our observation demonstrated that the ferroelectric domain motion is closely correlated with the phase transition diffuseness and dielectric relaxation
社団法人日本セラミックス協会の論文
1990-08-01