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MM: Fachverband Metall- und Materialphysik

MM 13: Growth

MM 13.1: Talk

Monday, February 25, 2008, 14:45–15:00, H 0111

Triple junction controlled room temperature grain growth revealed by X-ray measurements of nanocrystalline palladium — •Markus Ames, Jürgen Markmann, and Rainer Birringer — Universität des Saarlandes

X-ray measurements at room temperature of nanocrystalline, pure palladium prepared by inert-gas condensation reveal a very fast grain growth from 10 nm up to the instrumental limit of about 60 nm within several hours. Two grain growth regimes have been observed, showing quite different growth kinetics, an intermediate regime in the first 12 h after synthesis which is dominated by an overall decrease of microstrain and only minor grain growth followed by a regime of about 8 h duration that shows linear grain growth kinetics. The latter can neither be explained by a boundary-curvature-driven growth mechanism nor by a vacancy drag model, but in our case by a triple junction controlled grain growth.