Mechanism of large piezoelectric response due to special anisotropy near the morphotropic phase boundary in ferroelectric materials

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The purpose of our study is that stable phases as an average structure in complex perovskite ferroelectrics Pb(Zn1i3 Nb2,3)O3- PbTiO3 (PZN-PT) are clarified. In the present study, the equipment to measure the dielectric dispersion between 100 Hz to 1MHz under the DC biasing voltage of about 800 V was composed. The electric field-temperature phase diagrams in the electric field along the [001], [011], [111] directions in PZN-PT were clarified. Along [001] direction, the critical end point at about 1 kV/cm, which is considerably small, was found. It was also found that aspect of phase diagrams strongly depends on the direction of the electric field.