Abstract

A new method was proposed to form (Ba 0.5Sr 0.5)TiO 3–Al 2O 3 composite oxide film on etched aluminum foils. The specimens were covered with (Ba 0.5Sr 0.5)TiO 3 (BST) layer by dip-coating in citrate solution and subsequent heat-treatment under 400–650 °C, finally by anodizing in a hot boracic acid and borate solution. The BST powders heated under different temperatures were characterized by X-ray diffraction (XRD) and the specific capacitance of the coated specimens heat-treated under different temperatures and times was measured. It is found that the specific capacitance increases initially with enhancing the temperature and reaches to maximum at 550 °C, but slightly decreases with the heat-treatment time. The capacitance was increased by about 35% after BST coating.

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