Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

Intercalation of UF₆ into graphite, both from the gaseous phase and from the Ledon 113 solution, was studied. The amount of intercalated UF₆ from the gaseous phase was found to be inversely proportional to the size of graphite particles. Intercalation increases with the increasing temperature and surface area of graphite. The contact of gaseous UF₆ with graphite led to the formation of β-UF₅ that is not intercalated. In the Ledon solution, β-UF₅ is not formed. "Passivation" of graphite by elementary fluorine also prevents the formation of β-UF₅ but the amount of intercalated UF₆ decreases. The intercalation of UF₆ into graphite from the gaseous phase is accompanied by the increase of the distance between the parallel carbon atom layers up to the values of about 884 pm. Ternary intercalates graphite-UF₆-Ledon 113 are formed during the intercalation of UF₆ from the Ledon 113 solutions and the distance between the parallel carbon atom layers is 848-875 pm. Thermogravimetry in the presence of air revealed that the binary intercalates graphite-UF₆ decompose in a 3-step reaction while the ternary intercalates decompose in a 4-step reaction. In both cases uranium hexafluoride is not released but acts as a fluorination agent on the graphite carbon.