A. A. Rempel, A. A. Valeeva, A. S. Kurlov, G. Klinser, W. Sprengel, “Size effect in nonstoichiometric titanium monoxide and vanadium carbide nanocrystals measured by positron lifetime spectroscopy”, Mendeleev Commun., 2019, Volume 29, Issue 5,Pages <nobr>486

This article is cited in 4 papers

Communications

Size effect in nonstoichiometric titanium monoxide and vanadium carbide nanocrystals measured by positron lifetime spectroscopy

A. A. Rempel^abc, A. A. Valeeva^bc, A. S. Kurlov^b, G. Klinser^d, W. Sprengel^d

^a Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russian Federation
^b Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russian Federation
^c NANOTECH Centre, Ural Federal University, Ekaterinburg, Russian Federation
^d Institute of Materials Physics, Graz University of Technology, Graz, Austria

Abstract: A size effect in nonstoichiometric titanium monoxide TiO_y and vanadium carbide VC_y 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.

Language: English

DOI: 10.1016/j.mencom.2019.09.002