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Polycrystalline BiFeO3 (BFO) film has been fabricated on Pt(111)/Ti/SiO2/Si(001) substrate by a magnetron sputtering method. Both red light of 632.8 nm and purple light of 404 nm have been used to irradiate the sample. It is found that illumination of the sample by the two kinds of lights can induce an increase of the leakage‐current density. The increase of current density by purple light is about...
Many (K1−xNax)NbO3 (KNN)‐based ceramics with high piezoelectric performance exhibit undesirable strong temperature dependence due to the orthorhombic–tetragonal polymorphic phase transition near room temperature. In order to improve the temperature stability of the ceramics, many additives have been added into the KNN‐based ceramics to shift TO–T down to below room temperature. Contrary to the previous...
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