Abstract
Structural effects streaming from the quantum nature of the vacancies in solid helium are considered. As known, the point defects in quantum crystals are delocallized and turn into quasiparticles – defectons (vacancions, impuritons etc). An important feature is that the bottom of the quasiparticle energy band lies lower compared to the activation energy of a localized defect – as a rule by a half band width. However, the delocalization requires good periodicity and identity of the atoms around the defect. This may result both in repulsion between a vacancy and impurities, and in attraction between them. This leads to different effects – removal of impurities, new type of vacancy-impurity nanoclusters, creation of nuclei of new phases,vacancy induced local phase transition, change in the phase separation line in solid solutions. Experimental results are analyzed.
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