The Effect of Poling on the Properties of 0.65Pb(Mg1/3Nb2/3)O3--0.35PbTiO3 Ceramics

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The effects of the poling field on the structural and electrical properties of 0.65Pb(Mg1/3Nb2/3)O3--0.35PbTiO3 (0.65PMN--0.35PT) ceramics were investigated. The highest piezoelectric coefficient $d_{33}$, coupling coefficients $k_{\text{p}}$, $k_{\text{t}}$, and mechanical quality factor $Q_{\text{m}}$ were achieved for ceramics poled at electric fields between 2 and 3.5 kV/mm, whereas the $d_{33}$, $k_{\text{p}}$, $k_{\text{t}}$, and $Q_{\text{m}}$ of ceramics poled at higher electric fields, i.e., 4 and 4.5 kV/mm, were lower. The non-poled ceramics contained 86% of the monoclinic phase with the space group $Pm$ and 14% of the tetragonal phase with the space group $P4mm$. However, the ceramics poled at 2.5 kV/mm contained 99% of the monoclinic phase and the rest is the tetragonal phase. The results show that the ratio of the monoclinic to the tetragonal phases can be changed by the application of a poling electric field and that the extent of this change is dependent on the field strength.
2011-03-25