Polarization-electric field (p-E) hysteresis loops in 70.5%Pb(Mg 1/3 Nb 2/3 )O 3 -29.5%PbTiO 3 (PMN-29.5%PT) have been observed in the temperature range between 40 °C and 200 °C. In temperature range above the phase transition temperature under zero biasing field, the ferroelectric critical endpoint (CEP) in the temperature-field phase diagram in the dc biasing field applied along the [001] c direction (in the cubic coordinate) has been found at 138.5 °C and 1.2 kV cm −1 , while the temperature dependence of the spontaneous polarization has been clarified in the ferroelectric phase. Our experimental results of the ferroelectric CEP and spontaneous polarization in PMN-29.5%PT have been discussed on the basis of the Landau-type phenomenological theory.
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