Abstract
The effective distribution coefficient Keff of Ni between solid and liquid has been experimentally determined as a function of growth rates and crystallographic orientations for (Mg, Ni)2SiO4 crystals grown by the floating-zone method. Crystals were grown by the continuous mechanism at slow rates, but were faceted at high rates, which enables us to determine the dependence of Keff on orientations and on smooth versus rough interfaces. It has been verified that Keff of Ni becomes larger than the equilibrium value Ko as the growth rate increases and that Keff of faceted «110» directions is larger than that of non-faceted higher index directions. The results can be qualitatively explained by the theories which treat the distribution of elements in relation to growth kinetics. Element distribution during the recovery process from rounded to faceted morphology is also analysed in detail.
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