Abstract
Single crystals having a composition Zr 68.5Nb 30Co 1.5 were grown in a 50 mbar pure Ar atmosphere using a floating zone melting technique with RF power. The high temperature bcc structure could be retained at RT by quenching. The crystals are rods of 6 mm diameter and 30 mm length. Fast diffusion of the Co component in the alloy revealed a thermodynamical instability in the feed rod during growth process. This instability was studied in detail and a technique was developed to minimize its effect on the crystal perfection. Homogeneity of the Co composition of the crystals was achieved after annealing at high temperature. The crystalline quality was determined by γ-ray diffractometry.
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