TRANSPORT-PROPERTIES OF A GRAPHITIZED POLYIMIDE FILM AND ITS STAGE-2 FECL4- INTERCALATION COMPOUND

The temperature variation of the thermal conductivity, the electrical resistivity and the thermoelectric power of a graphitized polyimide fi lm has been measured in the temperature range 2 < T < 300 K. The effec t of electrochemical intercalation with FeCl4- ions has also been stud ied. The thermal conductivity results confirm the high degree of graph itization that may be obtained with polyimide films. It shows how inte rcalation increases the structural disorder and how the intercalate su bstantially contributes to the thermal conductivity at low temperature s. The electrical-resistivity and thermoelectric-power measurements re veal that the density of free carriers is about three times lower in s tage-2 FeCl4- solvated intercalation compounds obtained by an electroc hemical way than in stage-2 FeCl3 compounds synthetized by a classical method.