Physikalische Eigenschaften von nach einer modifizierten Kyropoulos-Methode gezüchteten NaCl- und KCl-Kristallen

The physical properties of NaCl and KCl crystals prepared from melts by the Kyropoulos method are described. The material was firstly refined by phosgen (COCl₂) by which the anion impurities were removed from the melt. The measurements of the absorption in UV and IR region, the microhardness and CRSS, the dislocation densities, the ionic conductivity and the study of the kinetics of colour centres show that crystals prepared by the described modified Kyropoulos method are not only free from OH⁻ ions but also from all other foreign anions with oxygen.