Sodium-sodium halide co-intercalated graphite: chemistry, structure and electrical transport

This study deals with the second to fourth stage compounds resulting from t he co-intercalation of sodium and sodium halides into graphite. The charge transfer was determined through chemical analyses and X-ray diffraction and the results are compatible with Raman spectroscopy data. We present detail ed results on c axis conduction between 4.2 K and 295 K and for hydrostatic pressures as high as 1.6 GPa. Possible mechanisms explaining the c axis co nduction are discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.