Temperature-Field Phase Diagrams in Pb(Mg_1/3Nb_2/3)O₃-29.5%PbTiO₃

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(Mg_1/3Nb_2/3)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.

Keywords:

• PMN
• relaxor
• ferroelectric
• morphotropic phase boundary
• critical end point