Abstract
A one-dimensional diffusion model for the calculation of total mass fluxes is applied to the physical vapour transport of HgI 2 in closed ampoules for various Peclet numbers. The vapour transport flux of mercuric iodide has been experimentally measured as a function of the source temperature (140–250°C) in the absence of argon and at argon pressures added to the ampoules in the 5–125 Torr range. The experimental results were compared with values calculated on the basis of the 1D diffusive model and KU convective model. It was found that in the system studied the rate of sublimation-condensation was limited by the vapour transport.
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