Regensburg 2000 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 12: Fachsymposium: Korngrenzen in HTSL
TT 12.6: Hauptvortrag
Dienstag, 28. März 2000, 16:30–17:00, H18
Comparison of different types of grain boundaries in YBCO monoliths and films — •Ch. Jooss1, B. Bringmann1, K. Thiele1, J. Hoffmann1, H. Walter2, A. Leenders2, R. Warthmann3, and H. C. Freyhardt1,2 — 1Institut für Materialphysik, Universität Göttingen, Windausweg 2, D-37073 Göttingen — 2Zentrum für Funktionswerkstoffe, Windausweg 2, D-37073 Göttingen — 3Max-Planck-Institut für Metallforschung, Heisenbergstr. 1, D-70569 Stuttgart
Due to the current limiting properties of grain boundaries, large scale applications of high-Tc superconductors require the formation of extended, highly textured material, such as melt textured monoliths or epitaxial films on different metallic and ceramic substrates. In order to compare the properties of grain boundaries in differently prepared YBCO with grain boundaries of YBCO films grown on bicrystalline SrTiO3 substrates, the microstructure and the local current distribution of the following grain boundaries are investigated: (i) Grain boundaries formed by multi-top-seeding melt-textured growth of YBCO monoliths. (ii) Grain boundaries formed by bonding of YBCO monoliths with and without chemical additions. (iii) Grain boundaries in YBCO films on technical substrates. (iv) Antiphase boundaries of different structural width in YBCO films on vicinal substrates. We work out fundamental differences to the grain boundaries in bicrystalline YBCO films on SrTiO3.