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Erschienen in:
04.06.2016
Structural and dielectric properties of hydrothermally prepared boehmite coatings on an aluminium foil
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 10/2016
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Abstract
We report on the synthesis, structure and dielectric properties of hydrothermally prepared hydroxide coatings on an aluminium foil. X-ray diffraction results indicate that this hydrothermally prepared coating consists of sub-micron crystals of boehmite phase [γ-AlO(OH)] which are homogeneously distributed over the whole surface. Crystals, around 200 nm in size have very narrow size distribution, blocky morphology and are densely packed forming the coating with thickness between 1.5 and 2.5 µm. The dielectric response of the boehmite layer is found to be extremely stable, with values of the dielectric constant of 5.5–6.5 over broad temperature (275–350 K) and frequency (1 kHz–1 MHz) ranges. The boehmite layers on the aluminium foil have a potential use for a variety of dielectric/capacitor applications.