Thermally stimulated currents in natural diamonds

The results of thermally stimulated depolarization currents in natural Yakut diamonds are presented. In the temperature range 200-650 K two peaks of TSD currents are observed; a low-temperature peak at 325 K and a high-temperature peak at 540 K. Repeated thermal cycling in the above temperature range leads to transformation of TSD current curves: the value of the high-temperature peak decreases and the value of the low temperature peak increases. The calculation of parameters of electrically active defects responsible for observed TSD current peaks gives the following values: W_lt=0.68 eV, ω_lt=5 10⁸ s^-1; W_ht=18 eV, ω_ht=5 10⁸ s^-1