Abstract
Dipole relaxation and aggregation were investigated on Cd2+ ion doped into KCl crystal using an ionic thermocurrent (ITC) method in the temperature range from 180 to 280 K. Two ITC bands with the activation energies (ER) of 0.57 and 0.50 eV were observed, in which the polarization temperatures were varied at 229, 232 and 235 K. The first intense band was attributed to the Cd2+–OH- dipole, in which OH- ion was probably formed by the decomposition of a water molecule intermixed during the crystal growth. After cleaning the second band, two new bands with ER=0.64 and 0.52 eV appeared and were regarded as the Cd2+-vacancy dipole and its aggregate, respectively. Dipole relaxation and aggregation processes were discussed including the aggregate models.
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