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The Control of Interfacial Reactions Via Length Scales of Ultrathin-Film Modulated Composites

Published online by Cambridge University Press:  25 February 2011

Loreli Fister ,
Thomas Novet ,
Christopher A. Grant ,
John McConnell  and
David C. Johnson
Loreli Fister
Affiliation:
University of Oregon, Materials Science Institute and Department of Chemistry, Eugene, Oregon 97403
Thomas Novet
Affiliation:
University of Oregon, Materials Science Institute and Department of Chemistry, Eugene, Oregon 97403
Christopher A. Grant
Affiliation:
University of Oregon, Materials Science Institute and Department of Chemistry, Eugene, Oregon 97403
John McConnell
Affiliation:
University of Oregon, Materials Science Institute and Department of Chemistry, Eugene, Oregon 97403
David C. Johnson
Affiliation:
University of Oregon, Materials Science Institute and Department of Chemistry, Eugene, Oregon 97403
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Abstract

Interfaces are difficult to probe because the volume of the interfacial region is exceedingly small compared with the bulk. Our approach is sequentially to deposit thin (5–50Å) elemental layers to create a unique initial reactant. Due to the short modulation length, the interfaces constitute a large fraction of the total composite. Composites modulated below a critical repeat unit length are found to evolve into homogeneous amorphous alloys. Composites modulated above this critical distance behave like bulk diffusion couples. The layered nature of the starting reactant permits the evolution of the interfacial structure to be followed in a quantitative manner using x-ray diffraction. Distinct differences in the evolution of the interfaces above and below the critical distance are observed. This approach to studying interfaces also permits the direct and selective synthesis of crystalline compounds. Nucleation is the rate-limiting step in the formation of a crystalline material from an amorphous alloy, and the phase formed is strongly influenced by the stoichiometry of the homogeneous amorphous alloy. Results from studies of molybdenum-selenium and iron-silicon ultrathin-film composites will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 629
Copyright
Copyright © Materials Research Society 1992

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References

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