Abstract
AbstractA technique for the preparation of self‐supporting windows of anodic barrier films on aluminium, which are essential for the precise interpretation of Rutherford backscattering data, is described. The generation of the window comprises several steps which include: (1) electropolishing of the superpure aluminium specimen in a perchloric acid/ethanol mixture; (2) masking a region of surface of the electropolished specimen with ‘Lacomit’ paint; (3) anodizing to develop a barrier‐type anodic film over the exposed aluminium surface; (4) removal of the paint to reveal the non‐anodized region on one face of the aluminium specimen which is then removed by electropolishing to leave the film window. Following this procedure, self‐supporting windows of anodic films, free from the aluminium substrate, having effective diameters up to about 10 mm, are produced. It is shown that the use of the self‐supporting window enables the Rutherford backscattering technique to be used to its full potential for the analysis of the barrier‐type anodic films, enabling Al and O profiles through the film to be resolved clearly.
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