Abstract
0.3 mol% Fe-doped 0.74Pb(Mg1/3Nb2/3)O3-0.26PbTiO3 (PMN-0.26PT) single crystals were grown by a modified Bridgman technique. The structure, dielectric and pyroelectric properties of the Fe-doped crystals were investigated and compared with pure PMN-0.26PT crystals. The investigations showed that small concentrations of Fe substitution increased the coercive field and remnant spontaneous polarization. Two dielectric anomaly peaks were observed under Curie temperature in the dielectric constant versus temperature curve for Fe-doped crystals, which is closer to the room temperature compared with the pure one. The results demonstrate that the domain walls can be pinned by the dopant dipolar defects 2Fe′Ti-Vo, resulting in an increase of coercive field and a decrease of dielectric constant and dielectric loss, which led to the improvement of the detectivity figure of merit (FOM) and kept high voltage responsivity FOM of doped crystals for pyroelectric devices. Such investigation will provide a better understanding of the nature in the complex perovskite materials with high performance.
Published Version
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