Abstract
Experimental and theoretical investigations of the growth kinetics of BCC3He precipitates in isotopic phase separation of HCP3He–4He are carried out. Low frequency pulsed NMR is used to study the mixture with an initial3He concentration of 3.18% at a pressure 3.7 MPa on stepped cooling down into the separation region. The separation time constant is shown to decrease monotonically with cooling. The evolution of heterophase structure resulted from separation is investigated by solving an equation for spatially non-homogeneous order parameter of decomposing mixture. The obtained temperature dependence of separation time constant is found to be in good agreement with the experiment.
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