Abstract
The structure evolution and origin of ultrahigh dielectric properties have been investigated in the low temperature range from 300 K to 5 K for [001]-oriented 0.68Pb(Mg1/3Nb2/3)O3–0.33PbTiO3 (PMN–33PT) crystal. The experimental results reveal that a short-range ordered monoclinic MA is the dominant phase at ambient temperature. As the temperature drops below 270 K, the MA transforms into monoclinic MC, and the MC remains stable until 5 K. Although no phase transition occurs from 5 K to 245 K, polar nanoregions (PNRs) display visible changes. The instability of PNRs is suggested as responsible for the low temperature relaxation. The ultrahigh dielectric constant at room temperature is associated with the instability of local structure and phase transition. Our research provides an insight into the design of high-performance ferroelectric materials.
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