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Exafs Studies of Grain Boundary Diffusion and Segregation

Published online by Cambridge University Press:  26 February 2011

S. M. Heald,
H. Chen and
J. M. Tranquada
S. M. Heald
Affiliation:
Metallurgy and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973.
H. Chen
Affiliation:
Metallurgy and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973.
J. M. Tranquada
Affiliation:
Metallurgy and Materials Science Division, Brookhaven National Laboratory, Upton, NY 11973.
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Abstract

The dominant pathway for thin film interdiffusion and interface reactions is often via grain boundaries. We have made EXAFS measurements of grain boundary constituents for two systems: interdiffusion in Ag-Au bilay-ers and solid state reaction of Nb with a copper-tin bronze to form Nb3Sn. The Ag-Au results indicate that Au in saturated Ag grain boundaries has an environment similar to a dilute Au in Ag solution with reduced coordination. For the Nb-bronze reaction, the results for the Cu environment indicate distinct changes in the grain boundary environment when small amounts of Ti, Hf, Zr, and Ta are added to the starting Nb. Both results demonstrate the ability of EXAFS to probe grain boundary environments, and to provide important structural information in understanding solid state diffusion and interdiffusion in thin film systems.

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References

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