PHYSICAL BEHAVIOUR OF COPPER IN KCL CRYSTAL

Measurements of the absorption and dielectric losses on KCl crystals with high concentration of copper were performed at room and liquid nitrogen temperature. The exciton bands at 383 nm and 375 nm were found as in the case of similar NaCl-Cu samples. After the annealing the bands disappeared, the bands at 226 and 330 nm decreased and the tan δ-peak at 50 ‡C increased. The interpretation is given on the basis of the existence of Cu-ion agglomerates and their disintegration in octohedral chlorocopper complexes after annealing. © 1969 Czechoslovak Academy of Sciences.