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Low Temperature Synthesis of MO2C/W2C Superlattices via Ultra-Thin Modulated Reactants

Published online by Cambridge University Press:  10 February 2011

Christopher D. Johnson  and
David C. Johnson
Christopher D. Johnson
Affiliation:
Chemistry Department, University of Oregon, Eugene, OR 97403
David C. Johnson
Affiliation:
Chemistry Department, University of Oregon, Eugene, OR 97403
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Abstract

We report here a synthesis method of preparing carbide superlattices using ultra-thin modulated reactants. Initial investigations into the synthesis of the binary systems, Mo2C and W2C using ultra-thin modulated reactants revealed that both can be formed at relatively low temperature(500 and 600°C respectively). DSC and XRD data suggested a two step reaction pathway involving interdiffusion of the initial modulated reactant followed by crystallization of the final product, if the modulation length is on the order of 10 Å. This information was used to form Mo2C/W2C superlattices using the structure of the ultra-thin modulated reactant to control the final superlattice period. Relatively large superlattice modulations were kinetically trapped by having several repeat units of each binary within the total repeat of the initial reactant. DSC and XRD data again are consistent with a two step reaction pathway leading to the formation of carbide superlattices.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 434: Symposium U – Layered Materials for Structural Applications , 1996 , 75
Copyright
Copyright © Materials Research Society 1996

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