Abstract
Single crystals of high purity tellurium up to one inch in diameter and several inches long were grown by by the Czochralski method from zone refined material. The process was carried out in an argon atmosphere with precise programmed control of r.f. heating. The vertical pull rate normally used was 1.5 cm/hr with rotation of the seed and of the crucible containing the liquid tellurium. Most runs were made with growth along the c-axis giving crystals with an approximately hexagonal cross-section at the start changing to circular further along the ingot. Monocrystallinity was checked with Laue X-ray photographs. To avoid polycrystallinity it is considered important that (1) the melt be clean and free of oxide so that good wetting of the seed is possible, (2) temperature control be sufficiently precise, (3) mechanical vibration be small enough that necking to a narrow diameter can be carried out prior to main growth and (4) the structural quality of the seed be high.
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