Abstract
The chemical vapor transport of by in a closed ampoule was evaluated experimentally and theoretically. A diffusion‐controlled mechanism does not explain the experimental results, except for the prediction of the correct order of magnitude, which might indicate that diffusion is an important rate‐determining step. The experiments were performed in the temperature range, 1160°–1260°K; a total pressure range, 0.1–3 atm; and with temperature gradients of 70°C and 100°C Above a total pressure of 1.5 atm the measured transport rate increases more slowly (with increasing total pressure) than the calculated rate based on a diffusion mechanism. Computer calculated curves of the relationships between the source and crystallization chamber temperatures, the total pressure, and the partial pressure difference of in the two chambers, can serve as a guide for future experiments. Single crystals of , average size 4 × 2 × 2 mm, were grown under the conditions studied in the present work.
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