Abstract
Abstract The need for high-purity samples in rare-earth and actinide research is extensively discussed. In many cases single crystals are of primary importance due to the large anisotropies encountered in these compounds. Purification methods for both, rare earth and actinide, metals are compared. Actinide research is hampered by reactivity, radioactivity, toxicity and scarcity of the elements. Out of the many possibilities crucible-free melt growth seems to be the most adequate technique to obtain high-quality single crystals. Some of the more spectacular results obtained in crystal growth of actinide intermetallics are mentioned.
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