Density,Colourability and Conductivity of Sr2+ Doped KCl Crystals

The measurements of colourability and density changes in KCl crystals with different Sr²⁺ contents point to the presence of two separate doping ranges in which different mechanisms of Sr²⁺ incorporation are active. Below 350 ppm Sr/KCl substitutional incorporation and above 350 ppm Sr/KCl precipitation of a second phase predominates. The latter process is accompanied by the formation of larger vacancy clusters. Ionic conductivity measurements imply that in the range between 80 and 350 ppm the aggregation of Sr²⁺ [+] dipols takes place.