A system is described in which a small-pressure vessel containing diffusion specimens is submerged in a well-stirred and regulated tin bath for diffusion-coefficient measurements in the temperature range 250–450°C up to pressures of 10 kbar. Temperature reproducibility attained is typically 0.1°C, which in combination with a negligible warm-up correction results in activation-volume measurements precise to about 1%.
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Buescher et al. (1972) studied this question.
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