Journal
MENDELEEV COMMUNICATIONS
Volume 29, Issue 5, Pages 486-488Publisher
ELSEVIER
DOI: 10.1016/j.mencom.2019.09.002
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Funding
- Russian Science Foundation [14-23-00025]
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A size effect in nonstoichiometric titanium monoxide TiOy and vanadium carbide VCy nanocrystals containing high concentrations of structural vacancies was detected by electron-positron annihilation. The effect consists of a considerable increase in the positron lifetime with the specific surface area. An analysis of the intensity of a long lifetime surface component in the positron annihilation spectra and the average positron lifetime for different nonstoichiometric compounds indicated a universal character of the observed size effect.
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