Author_Institution :
Sch. of Allied Med. Sci., Shinshu Univ., Nagano, Japan
Abstract :
Thermally stimulated current (TSPC and TSDC) have been measured with the pressed discs of 1,2,4-tr-chlorotrimethyIbenzene (1,2,4-TCTMB), 1,8-dichlorotetramethybenzene (1,3-DCTMB) and 1,2-dichlorotetramethylbenzene (1,2-DCTMB) between liquid nitrogen temperature and ~10°C. These materials show a single broad peak that is tailing in the higher temperature range of peak. The peak temperature of these derivatives Tm at which maximum current occurred was found always at -137°C, -145° and -154°C, respectively, under various polarizing conditions with the constant heating rate 2.5°C/min. The peak shape was broad compared with pentachlorotoluene, due to the mutual interaction of adjacent methyl groups. The polarization mechanism of these was discussed in relation with the crystal data
Keywords :
dielectric polarisation; electrets; molecular reorientation; organic compounds; thermally stimulated currents; -137 C; -145 C; -154 C; adjacent methyl groups; constant heating rate; crystalline benzene derivatives; dichloromethylbenzenes; maximum current; peak shape; peak temperature; polarization mechanism; polarizing conditions; pressed discs; single broad peak; thermally stimulated current; trichloromethylbenzenes; Cooling; Crystallization; Current measurement; Electrodes; Heating; Nitrogen; Polarization; Shape; Spectroscopy; Temperature distribution;
