Dresden 2003 – wissenschaftliches Programm

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M: Metallphysik

M 29: Nanoskalige Materialien III

M 29.1: Vortrag

Mittwoch, 26. März 2003, 14:45–15:00, IFW A

Oxygen Transport Properties of the Nanostructured Solid Electrolyte n-ZrO₂ ·Y₂O₃ — •Ralf Röwer, Gregor Knöner, Franz Leis, Klaus Reimann, and Hans-Eckhardt Schaefer — Institut für Theor. und Angew. Physik, Universität Stuttgart, 70550 Stuttgart

Nanostructured yttria stabilized zirconia (ZrO₂ ·Y₂O₃) specimens are prepared by sputtering a ZrY alloy target followed by cluster condensation, in situ compaction, oxidation and sintering. A comprehensive characterization of the specimens using density measurements, x-ray spectroscopy, chemical analysis and TEM yields a clear picture of the properties and microstructure of the specimens.

First measurements of the oxygen diffusion in nanostructured ZrO₂ ·Y₂O₃ are accomplished by using ¹⁸O as a tracer and Secondary Ion Mass Spectroscopy (SIMS) for depth profiling. The ¹⁸O Diffusion profiles are much deeper in the nanocrystalline specimens than in single crystals, resulting in an increased effective oxygen diffusivity.