Abstract
We report that the measurements of the pyroelectric current of thepre-poled [111]-oriented0.955 Pb(Zn1/3Nb2/3) O3–0.045 PbTiO3(PZN-4.5%PT) single crystals can shed some light on the phasetransition and spontaneous polarization characters of thismaterial in a similar way to measures of remanent polarization anddielectric properties. The pyroelectric current is measured and thecorresponding spontaneous polarization is calculated as a function oftemperature with various poling fields added during cooling the samplefrom 200 degrees C to room temperature. Critical electric field of0.061 kV/cm is found to be essential to induce the intermediateferroelectric orthorhombic phase between the ferroelectric rhombohedraland tetragonal phases. Below the critical field, the polarizationincreases almost linearly with the increase of poling field. At thecritical field, the polarization at 30 degrees C increases abruptly from14 μC/cm2 for a poling field of 0.06 kV/cm to29.5 μC/cm2 for a poling field of 0.061 kV/cm, andafterwards, increases slowly and saturates to 31 μC/cm2 forpoling fields beyond 0.55 kV/cm.
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