Dielectric response and domain wall structure in the relaxor based mixed crystal system

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Domain wall structures in Pb(Zn_<1/3>Nb_<2/3>)O_<3^->xPbTiO_3(PZN_<-x>PT;x=0%,8%,20%) crystals were investigated using atomic force microscopy(AFM). Ferroelectric and ferroelastic domain wall structures were observed on the etched surface. In the rhombohedral phase, a zigzag domain wall structure was newly found. We showed that all of the ferroelastic domain wall structures observed in the tetragonal and rhombohedral phases can be explained by the Sapriel theory, and concluded that no ferroelectric charged domain wall exists in the PZN_<-x>PT(x=8%,20%) crystal without an external field. The symmetry of the crystal phase in PZN-8%PT at room temperature is discussed. It was also found that finger print pattern in PZN disappears after the poling process even in the weak field of about 50 V/cm which is about 1/20 of the coercive field.