Abstract
The temperature and the DC biasing field dependences of dielectric permittivities, along the [001]-, [011]-, and [111]-directions of the cubic coordinate in 70.5%Pb(Mg1/3Nb2/3)O3- 29.5%PbTiO3 (PMN-29.5%PT) have been investigated. The temperature-field phase diagrams have been constructed in the field range below 5 kV/cm. The critical end point has been found at 1.2 kV/cm and 141°C under the electric field applied along the [001]-direction. It has been confirmed that the field induced orthorhombic phase appears in the electric field applied along the [011]-direction.