Structural organization, phase transformations and electrical resistivity of graphite-AsF6−-nitromethane compounds between 300 and 4.2 K
1989; Elsevier BV; Volume: 29; Issue: 2-3 Linguagem: Inglês
10.1016/0379-6779(89)90905-3
ISSN1879-3290
AutoresA. Chenite, M. Lelaurain, E. McRae, J.F. Marêché, A. El Haouari, D. Billaud,
Tópico(s)Advanced Battery Materials and Technologies
ResumoThe structural organization of stage 1 compounds prepared by anodic oxidation of HOPG in a solution of LiAsF6-CH3NO2 has been studied from room temperature (RT) to 4.2 K. At RT, the intercalate is unordered and the graphite stacking sequence A/A/A/… A transition manifests itself at 240 K by the appearance of numerous (hkO) reflections, the intensities of which increase as the temperature, T, further decreases. The transformation is complete by 200 K. The increase in FWHM of the (00l) reflections as soon as the ordering starts shows that the domain size along →c decreases. Some data have also been collected on 2nd stage products and the crystallographic studies are complemented by an investigation of the electrical resistivity over the same T range: ϱc(T) is shown to be particularly sensitive to the structural organization.
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