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Using Ultrathin-Film, Modulated Composites to Control the Reaction Mechanism of Ternary Compound Formation

Published online by Cambridge University Press:  25 February 2011

Loreli Fister  and
David C. Johnson
Loreli Fister
Affiliation:
University of Oregon, Materials Science Institute, Eugene, OR 97403
David C. Johnson
Affiliation:
University of Oregon, Materials Science Institute, Eugene, OR 97403
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Abstract

A predictable, controllable approach to the synthesis of ternary compounds through known intermediates is presented. Thin and ultrathin film superlattices were made in the Mo-Se, Cu-Se and Mo-Cu systems. Differential scanning calorimetry, low- and high-angle x-ray diffraction were used to assess the interdiffusion and nucleation reactions between elemental layers in these one-dimensional crystals. The experimental parameter modulation distance was used to influence the interfacial reactions. The results from each binary system were then used to predict the reaction pathway in the synthesis of a ternary compound, Cu2Mo6Se8. Superlattices with two different lengthscales were investigated. In the first, only one intermediate, MoSe2 which typically crystallizes at ∼200'C, is observed prior to the crystallization of Cu2Mo6Se8. In the second, no crystalline intermediates are observed below 6000 C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 665
Copyright
Copyright © Materials Research Society 1992

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References

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