Isothermal depolarization currents in triglycine sulphate

Results of depolarization current studies in triglycine sulphate (TGS) single crystal are presented. The influence of temperature, polarization time, and the strength of polarizing de field on the depolarization current has been investigated. The measurements were performed for polarization times in the range between 1 s and 10(5) s; the polarizing field was varied from 10 V/cm to 10 kV/cm, and the temperature between -190 degrees C and 25 degrees C. The results confirm that the depolarization cut-rent in TGS follows the formula I-d similar to [(omega(p)t)(n) + (omega(p)t)(m)](-1), where n < 1 and m > 1. The values of the parameters n and m depend on both the electric field strength and the polarization time as well as on the temperature of the experiment. The loss peak frequency wp exhibits activation character: omega(p) similar to exp(-E/k(B)T) with E = 0.34 eV at temperatures directly below room temperature and E = 0.013 eV in the range of liquid nitrogen temperatures.