The results of thermally stimulated depolarization currents in natural Yakut diamonds are presented. In the temperature range 200-650K two peaks of TSD currents are observed low-temperature peak at 325K and high-temperature at 540K. Repeated thermal cycling in the mentioned temperature range leads to transformation of TSD current curves: the value of high-temperature decreases and the value of lowtemperature peak increases provided all unchanged. The calculation of parameters of electrically active defects responsible for observed TSD current peaks gives the following values: wlt=o,68 ev, q = 5 108 s-1; Wht=1,18 eV, o h c 5 108 s-1.
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