The properties of SBFTi-x ferroelectric ceramics
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BFO(BiFeO3)-SBTi(Sr2Bi4Ti5O18) composite ferroelectric ceramics(referred to as SBFTi-x) were prepared by Sr2Bi4Ti5O18 and BiFeO3, with the increasing of BFO content, compared to SBTi ceramics, Bi3+ and Fe3+ co-doped in A and B site cause the lattice distortion, which make SBFTi-x ceramics show the higher the remanent polarization and low leakage current density at room temperature. SBFTi-0.3 ceramic exhibits excellent ferroelectric properties at the electric field of 85kV/cm, the remanent polarization 2Pr and coercive field 2Ec is 18.66μC/cm2 and 77.7kV/cm respectively, the lowest leakage current density J= 2.34×10-6A/cm2. In addition, with the increase BFO content, the changes of oxygen concentration and built-in electric field make the leakage current mechanism of SBFTi-x ceramics turn into the Ohms transmission mechanism-based from the Space-charge limit for leading.
Abstract
BFO(BiFeO3)-SBTi(Sr2Bi4Ti5O18) composite ferroelectric ceramics(referred to as SBFTi-x) were prepared by Sr2Bi4Ti5O18 and BiFeO3, with the increasing of BFO content, compared to SBTi ceramics, Bi3+ and Fe3+ co-doped in A and B site cause the lattice distortion, which make SBFTi-x ceramics show the higher the remanent polarization and low leakage current density at room temperature. SBFTi-0.3 ceramic exhibits excellent ferroelectric properties at the electric field of 85kV/cm, the remanent polarization 2Pr and coercive field 2Ec is 18.66μC/cm2 and 77.7kV/cm respectively, the lowest leakage current density J= 2.34×10-6A/cm2. In addition, with the increase BFO content, the changes of oxygen concentration and built-in electric field make the leakage current mechanism of SBFTi-x ceramics turn into the Ohms transmission mechanism-based from the Space-charge limit for leading.
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