Наукові статті

Influence of coadsorbed strontium atoms on surface diffusion in lithium submonolayer films on tungsten (112) face

Заїка, С.О.

The surface diffusion of lithium atoms in coadsorbed Li–Sr submonolayers on the atomically anisotropic tungsten (112) face is studied, by using the method of scanning contact-potential microscopy. The influence of strongly bound and less mobile Sr adatoms on the diffusion kinetics of more mobile Li atoms is analyzed. Coadsorbed strontium atoms are found to strongly suppress the diffusion of lithium ones. The concentration dependences are obtained for the chemical diffusion coefcients, activation energy, and pre-exponential factor in the Arrhenius equation. Possible mechanisms of surface diffusion in coadsorbed flms are considered, by taking the nature of the lateral interaction between adatoms into account, which is responsible for the formation of long-period chain structures. A conclusion is drawn that the collective mechanisms of difusion, which give rise to the exponential growth of diffusion coefcients, become active as the lithium coverage degree increases so that the film becomes structurally incommensurate with the substrate. The results obtained can be applied to the development of technologies for the modification of physico-chemical properties of surfaces.

English

2012

поверхнева дифузія

Loburets A.T. Influence of coadsorbed strontium atoms on surface diffusion in lithium submonolayer films on tungsten (112) face / A.T. Loburets, S.A Zaika, A.G. Naumovets // Ukr. J. Phys. – 2012. – Vol. 57, № 6.– P. 661–669.

2071-0194

Ministry of Education and Science, Youth and Sports of Ukraine (the state registration number 0110U002256), and in the framework of projects V-130 and OTs-138 sponsored by the National Academy of Sciences of Ukraine.