STUDY OF RELAXATION IN P-BR2F4C6 AND P-I2F4C6

This paper reports new data obtained by thermally stimulated current ( TSC) measurements in p-dibromo- and p-diiodotetrafluorobenzene in the range -180 degrees C to +50 degrees C and -180 degrees C to 100 degree s C respectively. Peaks were observed corresponding to relaxation proc esses in both samples. The analysis of the relaxation mode situated at -60 degrees C shows that, in p-I2F4C6, all the relaxation times have the same value t(c) = 3.10(-6) s at the compensation temperature T-C = 87 degrees C. This temperature corresponds to a phase change (Pawley et al., 1977) in p-diiodotetrafluorobenzene. The experimental TSC glob al spectrum changes with thermal tretament at 50 degrees C for p-C6F4B r2. The relaxation processes in p-dibromotetrafluorobenzene were descr ibed by a compensation law.