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Crystallographic and transport studies on AsF5 intercalated graphite from 4.2 to 295 K. II. Effects of structural transformations and demixing on basal plane and c-axis electrical resistivity

Published online by Cambridge University Press:  31 January 2011

E. McRae
Affiliation:
Laboratoire de Chimie du Solide Minéral, Service de Chimie Minérale Appliquée, UA CNRS 158, Université de Nancy 1, BP 239, 54506 Vandoeuvre les Nancy, France
M. Lelaurain
Affiliation:
Laboratoire de Chimie du Solide Minéral, Service de Chimie Minérale Appliquée, UA CNRS 158, Université de Nancy 1, BP 239, 54506 Vandoeuvre les Nancy, France
J. F. Marêché
Affiliation:
Laboratoire de Chimie du Solide Minéral, Service de Chimie Minérale Appliquée, UA CNRS 158, Université de Nancy 1, BP 239, 54506 Vandoeuvre les Nancy, France
G. Furdin
Affiliation:
Laboratoire de Chimie du Solide Minéral, Service de Chimie Minérale Appliquée, UA CNRS 158, Université de Nancy 1, BP 239, 54506 Vandoeuvre les Nancy, France
A. Hérold
Affiliation:
Laboratoire de Chimie du Solide Minéral, Service de Chimie Minérale Appliquée, UA CNRS 158, Université de Nancy 1, BP 239, 54506 Vandoeuvre les Nancy, France
M. Saint Jean
Affiliation:
Groupe de Physique des Solides, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cédex 05, France
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Abstract

Part I of this study has shown that first stage AsF5 intercalated graphite samples can be classified into two types of compounds, depending upon the nature of the structural modifications they undergo upon lowering the temperature from 295 to 4.2 K. These structural changes are related to demixing of the species contained within the intercalate resulting in the formation of phases rich in AsF5, AsF6 − AsF5, or AsF3 depending on the degree to which the AsF5 has been converted into AsF6 and AsF3. Resistivity studies have been carried out in the basal plane [ρa (T)] and along the c axis [ρc (T)]. The type 1 compounds, in which the AsF5 has undergone little conversion, manifest a ρa (T) transition related to the incommensurate-to-commensurate (I⇉C) transformation of the AsF5 in-plane unit cell and a rapid, structureless 300 to 200 K decrease in ρc (T). The type 2 compounds involving a greater degree of conversion of AsF5 into AsF3 and AsF6 yield more complex ρc (T) behavior from 300 to 200 K attributed to the more involved ordering phenomena; no anomalies are seen in ρa (T). In the case of the stage 2 compounds, changes in ρc (T) are seen down to lower temperatures in accord with structural data indicating a downshift of the I⇉C transformation by ∼ 70 K. The transport results are discussed in the light of the crystallographic data and the low-temperature results are analyzed within the framework of proposed conductivity models.

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Articles
Copyright
Copyright © Materials Research Society 1988

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References

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Crystallographic and transport studies on AsF5 intercalated graphite from 4.2 to 295 K. II. Effects of structural transformations and demixing on basal plane and c-axis electrical resistivity
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Crystallographic and transport studies on AsF5 intercalated graphite from 4.2 to 295 K. II. Effects of structural transformations and demixing on basal plane and c-axis electrical resistivity
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Crystallographic and transport studies on AsF5 intercalated graphite from 4.2 to 295 K. II. Effects of structural transformations and demixing on basal plane and c-axis electrical resistivity
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