Kavli Affiliate: Xian Chen
| First 5 Authors: Chenbo Zhang, Xiaotong Peng, Bo Liu, Kai Zhang, Xian Chen
| Summary:
Phase-transforming ferroelectric materials are widely used in energy
harvesting and conversion devices. However, the functionality of these devices
is significantly impeded by electrical leakage at high temperatures. In this
study, we fundamentally study the mechanism of electrical leakage suppression
due to phase transformation in a series of donor-doped ferroelectric
oxides,Ba0.955Eu0.03Ti(1-x)ZrxO3 with 0<= x<= 0.15. Our experiments clearly
demonstrate that the symmetry-breaking phase transformations result in the
reduction in electrical conductivity of the donor-doped ferroelectric oxides.
The DFT calculation suggests that the donor energy level undergoes a
shallow-to-deep transition at the phase transformation temperature. By
analyzing the constitutive model of the leakage current density function, we
propose a leakage suppression coefficient that rationalizes the development of
ferroelectrics with low electrical leakage at elevated temperatures.
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