Peculiarities of phase transformations in graphite intercalation compounds with bromine

Abstract

The X-Ray (00L) and (HK0) patterns of third stage graphite intercalation compound with bromine have been experimentally investigated in the range of (150–290) K. The dependence of the intercalate identity parameter on temperature is determined. In the temperature range of (150–290) K there are three temperature intervals with different values of the linear thermal expansion coefficient (α): К−1 in range I (238–300)K, К−1 in range II (174–238) K and К−1 in range III (150–174) K. The abrupt change of the linear thermal expansion coefficient has been detected at 238 K and 174 K. The redistribution of the intensities of the (HK0) pattern main components on cooling from the 290 K to 150 K, in particular, a decrease of some maxima intensities indicates the active migration processes of bromine molecules in the two-dimensional lattice of the intercalate.