Effect of abnormal high solubility of impurity in nanocrystalls and its metrological aspects

The problem of doping impurity intrusion into nanoparticles is analyzed. Thermodynamical model of the effect is developed, taking into account specific properties of nanoparticles: quantum confinement of elementary excitations and the impact of nanoparticle surface states compared with bulk ones. We obtained the size dependence of impact equilibrium solubility in nanoparticles. Magnetometric experiments, carried out on nanoparticle ensemble of iron oxide doped with gadolinium and other impurities, show lack of contradictions and good qualitative accordance between the model and the experiment.