Abstract
Dielectric constants in Pb(Zn1/3Nb2/3)O3-PbTiO3 were measured under the zero-field heating after a preceding field cooling. It was confirmed that a sharp phase transition between ferroelectric phases in Pb(Zn1/3Nb2/3)O3 appears at 114°C, and the phase boundary connects to the morphotropic phase boundary in the Pb(Zn1/3Nb2/3)O3-PbTiO3 (PZN-PT) solid solution system. A new phase diagram in the poled sample of PZN-PT was proposed in a wider temperature range. It is concluded that the phase transition between ferroelectric phases of PZN is the one between the tetragonal and rhombohedral phases.
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