Improved electrical properties of Pr-doped SrTiO3 films
Solid State Communications(2010)
摘要
Sr1−xPrxTiO3 films were prepared by metal organic deposition method on (111) Pt/Ti/SiO2/Si substrates. Pr-doping greatly improves the dc leakage behavior of the films. The samples with x=0.075 show excellent electric field frequency and temperature stability of dielectric properties, while the x=0.025 samples indicate an obvious dielectric relaxation behavior and better polarization versus applied electric field (P–E) hysteresis loops. These peculiar electrical properties can be explained mainly by the Pr-doping-induced changes in the free charge carriers, the lattice distortion, the charge transfer process and polar nanoregions. In addition, the variable valence of Pr ions may also have significant impacts.
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关键词
A. SrTiO3 film,D. Electric property,D. Ferroelectricity
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