High-field properties of PMN-PT single crystals

Abstract

Electric properties of relaxor ferroelectric Pb(Mg/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ (PMN-PT) single crystals near the rhombohedral-tetragonal transition under high-field phase boundary were studied. The single crystals in the <001> direction exhibited a remanent polarization of 30 /spl mu/C/cm/sup 2/, coercive field of 3.5 kV/cm and switchable polarization of 51 /spl mu/C/cm/sup 2/ at 9 kV/cm. The polarization-temperature dependence of the crystals indicated a reduction of 5% in the remanent polarization and 3.2% in switchable polarization at 80/spl deg/C. The remanent polarization decreased to 5 /spl mu/C/cm/sup 2/ at 146/spl deg/C (T/sub m/). However the switchable polarization fell to zero at that temperature. A loss of 12% in the polarization was observed in the switching cycles up to 2.5/spl times/10/sup 8/ reversals under bipolar pulse of 12 kV/cm. On the other hand, the crystals have a resistivity of 1.6/spl times/10/sup 9/ /spl Omega/-cm at 100/spl deg/C and with a electric field of 10 kV/cm. These results are favorable to applications for device design of the PMN-PT crystals.