The dependence of dielectric properties on the thickness of (Ba,Sr)TiO3 thin films |
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Institution: | 1. School of Materials Science and Engineering, Seoul National University, San 56-1, Shinrim-Dong, Seoul 151-744, Republic of Korea;2. Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea |
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Abstract: | In the dielectric (Ba,Sr)TiO3 thin films, the correlation between the film thickness and the dielectric properties was investigated. The dielectric properties such as the dielectric constant (ε) and dielectric loss (tan δ) were measured using the capacitor geometry. As the film thickness increased, the dielectric constant also increased due to the reduction of the interfacial dead-layer effect. However, the dielectric loss did not show a monotonous variation with the increasing film thickness. It was found that the dielectric loss correlated well with the non-uniform distribution of local strain, as analyzed by X-ray diffraction, according to the Curie–von Schweidler relaxation law. |
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