The study of phase structure of dilute 3He - 4He solid mixture of different quality is performed by spin echo NMR technique. The diffusion coefficient is determined for each coexistent phase. Two diffusion processes are observed in rapidly quenched (non-equilibrium) hcp samples: the first process has a diffusion coefficient corresponding to hcp phase, the second one has huge diffusion coefficient corresponding to liquid phase. That is evidence of liquid-like inclusions formation during fast crystal growing. It is established that these inclusions disappear in equilibrium crystals after careful annealing.
@article{arxiv.0906.3163,
title = {Fast Diffusion Process in Quenched hcp Dilute Solid $^3$He-$^4$He Mixture},
author = {Ye. O. Vekhov and A. P. Birchenko and N. P. Mikhin and E. Ya. Rudavskii},
journal= {arXiv preprint arXiv:0906.3163},
year = {2015}
}