[en] An X-ray method for the determination of concentration profiles in thin film diffusion couples is presented. This method is based on the theory of Fourier analysis of X-ray diffraction profiles which is generalized to polycrystalline samples showing non-uniform lattice parameter. A Fourier synthesis of the concentration spectrum is possible when the influences of the particle size and the strain in the sample as well as the instrumental function are eliminated from the measured diffraction profile. This can be done by means of reference profiles obtained from layers of the diffusion components. Absorption of the radiation in the sample is negligible when diffusion couples of symmetrical sandwich structure are used. The method is tested experimentally in the system Au-Cu. (orig.)

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[en] In this review article we firstly discuss diffusion process in general followed by a brief survey of diffusion studies in AMsup(s) and MGsup(s). Then we report our results of our study on diffusion in amorphous Cu-Ag thin films

[en] Magnetic and ⁵⁷Fe Moessbauer measurements are reported for amorphous (Nd, Fe). The ordering temperatures, but not the spontaneous magnetisation, are strongly influenced by the preparation conditions. A broad hyperfine field distribution, slightly increasing with increasing Nd content, is observed at 77 K. The mean hyperfine fields remain constant

[en] Films produced by quenching Cu-Ag vapour onto cooled substrates at liquid nitrogen temperature have been investigated using electron microscopy, electron diffraction and electrical resistivity measurements. In the composition range from 30 to 70 at% Cu the as quenched films are amorphous, and within the range of 35 to 63 at% Cu the amorphous phase is stable above room temperature with a maximum crystallization temperature Tsub(c)=381 K at 47.5 at% Cu. Crystallization results in the formation of a supersaturated fcc solid solution which decomposes in a second crystallization step. The effect of deposition rate, film thickness, temperature and surface of the substrate, and most importantly of the composition on the transition temperatures has been investigated. A comparative study of the formation of amorphous phases in a wide variety of Cu-based alloys is presented. (author)