Study of phase separation kinetics of3He–4Hesolid mixtures by precision pressure measurements
作者:
A. N. Ganshin,
V. A. Maidanov,
N. F. Omelaenko,
A. A. Penzev,
E. Ya. Rudavskii,
A. S. Rybalko,
期刊:
Low Temperature Physics
(AIP Available online 1998)
卷期:
Volume 24,
issue 9
页码: 611-616
ISSN:1063-777X
年代: 1998
DOI:10.1063/1.593661
出版商: AIP
数据来源: AIP
摘要:
The kinetics of isotopic phase separation of3He–4Hesolid mixtures for various molar volumes has been studied by precision pressure measurements at a constant volume. It is found that the attainment of equilibrium between coexisting phases formed as a result of stratification is described correctly by an exponential dependence for various modes of crystal cooling and heating. The characteristic phase separation time decreases with temperature, thus confirming the athermal quantum nature of the growth of a new phase during the phase transition. The phase separation time is found to increase considerably with crystal pressure. It is shown that the prevailing theory can provide only a qualitative description of the established regularities. A quantitative description of experimentally observed decay times requires an analysis of diffusion processes in a gas of impurity excitations in the presence of a concentration gradient. ©1998 American Institute of Physics.
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