Preparation and Electrical Properties of an Anodized Al2O3–BaTiO3 Composite Film
Identifieur interne : 000C02 ( Main/Merge ); précédent : 000C01; suivant : 000C03Preparation and Electrical Properties of an Anodized Al2O3–BaTiO3 Composite Film
Auteurs : Xianfeng Du [République populaire de Chine] ; Youlong Xu [République populaire de Chine]Source :
- Journal of the American Ceramic Society [ 0002-7820 ] ; 2008-07.
Abstract
A highly stable, water‐based barium titanate BaTiO3, BT, sol was synthesized using a sol–gel route through a chelate lactate technique. Dried BT precursor powders were measured by thermal gravimetry–differential thermal analysis and X‐ray diffraction. It was found that BT powders first converted into barium carbonate BaCO3, Ti complex, and intermediate phase Ba2Ti2O5CO3, and then transformed into perovskite phase BaTiO3. The crystallization temperature was about 550°C. The low‐voltage etched aluminum foils were covered with BT sol by dip coating, and then annealed at 600°C for 30 min in air. After that, the samples were anodized in a 15 wt% aqueous solution of ammonium adipate. The voltage–time variations during anodizing were monitored, and the electrical properties of the anodic oxide film were examined. It was shown that the specific capacitance, the product of specific capacitance and withstanding voltage, and leakage current of samples with a BT coating were about 48.93%, 38.50%, and 167% larger than that without a BT coating, respectively.
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DOI: 10.1111/j.1551-2916.2007.02104.x
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