ABSTRACT
I. INTRODUCTION During these last two decades the intercalation of acceptor species in graphite has been studied intensively. It is known that the candidates for such interca lation have to fulfill several criteria: high volatility, covalent character, Lewis acid type, and the ability to form two-dimensional arrays. These conditions are often met for metal chlorides or bromides, and therefore the intercalation of these species in graphite has been investigated extensively. On the other hand, one might consider that the intercalation of fluorides is less attractive than that of chlorides because of their propensity to form three-dimensional structures, the high melting temperature for low-oxidation states of metal fluorides, and so on. The intercalation of hexafluorides or pentafluorides has, however, been stud ied largely because of their high vapor pressure and the strong covalent character of the metal-fluorine bond. Among these species, AsF5 and to a lesser extent SbF5 have been particularly well investigated.
