Über den Einfluß von Wachstumsfluktuationen auf den effektiven Verteilungskoeffizienten beim Zonenschmelzen

The influence of growth rate fluctuations on the micro and macrodistribution of Ir during zone melting of Mo is investigated. The microdistribution is principally the same as that found for W in Mo, although the equilibrium-distribution-coefficient k₀ is now smaller than 1. A mean effective distribution coefficient k_eff describes the macrodistribution. Its dependence on the fluctuations is qualitatively quite different from that of W in Mo with k₀ > 1. With the occurence of fluctuations the value of k _eff is changed continually in the direction of one. Its dependence on the zone-melting rate is found in the region of fluctuations too.