Ziel
One of the barriers on the way to thin film applications of new families of HTSCs is the lack or insufficient development of target preparation technology. From this point of view it looks reasonable to participate in the efforts of the Moscow University group in the preparation of fine grained homogeneous precursor powder and to use the skills of the Minsk group in the application of non-traditional pressing methods like explosive pressing. Target pellets obtained by different powder preparation and densification methods will be used for obtaining thin films by laser ablation at the University of Twente. Comparison of the film properties as well as the composition of the microstructure of targets before and after ablation may give very useful information for the further development of HTSC thin film components.
Further improvement of substrates quality obtained using the flame fusion Verneuil method is seriously limited by the insufficient quality of precursor powders. Promising steps in answer to this problem may be found using modern methods of chemical homogenization like freeze drying or sol-gel processes. Synthesis of BaZrO3 and SrTiO3 powders in the laboratories of Moscow University and Minsk by the above-mentioned methods, and the evaluation of their technological usefulness at the crystal growth facilities of Fachhochschule Münster, may lead to important conclusions about the role of different parameters of the precursor powders in the quality of the final crystal.
Efforts will also be applied to estimating the lower boundaries of phase formation in the Bi-Pb-Sr-Ca-Cu-O system as well as the R'-R''-Ba-Cu-O system. The application of cryochemical homogenization for precursor preparation may give a better understanding of the boundaries of the phase fields in this system. In this area the synthetic skills of the Moscow group will be joined with the outstanding experience of the group from KFA Jülich in the phase diagram studies. Some of the newly discovered materials based on nickelate and cobaltite ceramics may be interesting for applications in large-scale chemical processes like catalysts and sensor materials. A necessary step on the way to its application is the investigation of their oxygen stoichiometry and its influence on electrophysical parameters.
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48565 Steinfurt
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