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High-resolution transmission electron microscopy on KHx–GIC's

Published online by Cambridge University Press:  03 March 2011

L. Salamanca-Riba ,
N.-C. Yeh ,
M. S. Dresselhaus ,
M. Endo  and
T. Enoki
L. Salamanca-Riba
Affiliation:
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
N.-C. Yeh
Affiliation:
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
M. S. Dresselhaus
Affiliation:
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
M. Endo
Affiliation:
Shinshu University, Nagano-shi 380, Japan
T. Enoki
Affiliation:
Institute for Molecular Science, Okazaki 444, Japan

Abstract

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The in-plane and c-axis structure of KHx—GIC's and KDy—GIC's is studied using transmission electron microscopy (TEM) and x-ray diffraction as a function of intercalation temperature and time. With the TEM, two commensurate in-plane phases are found to coexist in these compounds with relative concentrations depending on intercalation conditions. When the direct intercalation method is used, the first step of intercalation is the formation of a stage n potassium-GIC and the final compound is a stage n KHx—GIC (or KDy—GIC). Highresolution (00l) lattice images show direct evidence for intermediate phases in the intercalation process. These intermediate phases are hydrogen (deuterium) deficient and are found at the boundary between pure potassium regions and regions with high hydrogen (deuterium) content. A comparison of the structure for the two methods of intercalation of KH is also presented.

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 1 , February 1986 , pp. 177 - 186
Copyright
Copyright © Materials Research Society 1986

References

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