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13C NMR Chemical Shifts of Oriented Cesium-Graphite Intercalation Compounds

Published online by Cambridge University Press:  15 February 2011

D.D. Dominguez ,
H.A. Resing ,
C.F. Poranski Jr  and
J.S. Murday
D.D. Dominguez
Affiliation:
Naval Research Laboratory, Code 6120, Washington, Dc 20375, USA
H.A. Resing
Affiliation:
Naval Research Laboratory, Code 6120, Washington, Dc 20375, USA
C.F. Poranski Jr
Affiliation:
Naval Research Laboratory, Code 6120, Washington, Dc 20375, USA
J.S. Murday
Affiliation:
Naval Research Laboratory, Code 6120, Washington, Dc 20375, USA
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Abstract

The 13C NMR lines of the stage I cesium graphite compound are broad (ca. 600 Hz) at all orientations, reflecting immobile Cs intercalation; in terms of an axial pattern the principal values are δ11 = 95 ± 5 and δ┴6 = 130 ± 6 ppm. For third and fourth stage compounds the bounding layers give a relatively sharp (60–100 Hz) pair of lines at all orientations, thus demonstrating axially symmetric shift tensors: δ11 = 66 and 56 ppm; δ┴ = 159 and 149 ppm, respectively. These well defined axial tensors reflect atomic motions in the incommensurate Cs layer; the pair of lines may arise from the two classes of carbons - those above carbons in a subsequent layer and those above hexagon centers. Lines of inner layers are sharpest for special orientations →c II →B0 and →c ┴ →B0.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 20: Symposium H – Intercalated Graphite , 1982 , 363
Copyright
Copyright © Materials Research Society 1983

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References

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