Effect of the phase separation kinetics on the homogenization kinetics of solid mixtures of 4He in 3He
I.A. Gritsenko, V.A. Maidanov, S.P. Rubets, E.Ya. Rudavsky, and A.S. Rybalko
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukrain
Received November 10, 2017
New features of the kinetics of phase separation and subsequent homogenization of the solid solution of 4He in 3He are found in the temperature range 0.1–0.5 K. The separation was initiated both by rapid cooling of a homogeneous mixture and by its cooling by small steps with respect to temperature. Information on the kinetics of phase transitions was obtained by means of a precision measurement of the pressure of solid helium at a constant volume. It is established that the homogenization kinetics essentially depends on the kinetics of the preceding separation. Under rapid cooling to the separation region, the homogenization time constants are more than 5 times smaller than in the case of slow cooling. The results obtained are consistent with the model of homogeneous nucleation.
PACS: 67.80.dj Defects, impurities, and diffusion;
Key words: solid 3He–4He mixtures, phase transitions, separation, homogenization, phase transition kinetics.
Published online: February 26, 2018