Dielectric Relaxation Changes Due to Optical Conversion "" in KCl:SrCrystals
- 11 March 1966
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 143 (2) , 619-623
- https://doi.org/10.1103/physrev.143.619
Abstract
Optical-absorption and dielectric-loss measurements have been carried out and correlated in additively colored KCl:Sr single crystals, in order to discern whether the impurity-vacancy dipolar complexes are involved in the optical conversion of centers to centers. The centers were created by irradiating samples containing only centers at 40°C by means of high-intensity light absorbed by the band; a concentration of centers was obtained in about 30 sec. In the meantime the concentration of impurity-vacancy complexes was measured by means of dielectric losses. The results show that is not instantaneously affected by the growth of centers but rather decreases slowly thereafter in a time of about 20 min after the -light illumination. The total change of was approximately 10% of the initial value ( dipole ), i.e., dipoles. Similar measurements have been carried out by irradiating at 0°C and by determining by measuring the discharge of the induced polarization at increasing temperature (method of the ionic thermoconductivity): the results obtained thus are consistent with the ones at 40°C. This experiment rules out the possibility that the impurity-vacancy dipoles take part directly in the -center formation; the proposed models are discussed in view of these results.
Keywords
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