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For the investigation of perfection, homogenity, absorption and luminescence a large number of K(Zn, Mn, Co) F 3 -single crystals with variable Mn and Co contents were grown by the Stockbarger-Bridgman method under vacuum and argon protection gas. From these crystals the Mn-and Co-contents were determined quantitatively as a function of the crystal region by means of the electron-microprobe- and absorption-techniques. The distribution curves [c S /c 0  = f(x)] are discussed as a function of the crystal growth parameters. The distribution-coefficients have been determined with the help of Pfann's formula and a proposed formula which permits the computation of the distribution-coefficient for every crystal region. Both methods lead to the same results:

Zur Verteilung von Mn und Co in K(Zn,Mn,Co) F 3 -Einkristallen / The Distribution of Mn and Co in K(Zn, Mn, Co) F 3 -Single Crystals