TITLE:
Driving the Diffusion of Cesium Atoms of Graphite Monolayers on Metal Surfaces into Rhenium (1010)
AUTHORS:
A. K. Orujov
KEYWORDS:
Surface Ionization, Graphite Monolayer, Intercalation, Diffusion
JOURNAL NAME:
Journal of Modern Physics,
Vol.5 No.6,
April
21,
2014
ABSTRACT: It has been
shown experimentally for the first time that diffusion of cesium n rhenium takes
place at irradiation of atoms flux heated up to Т ≤ 1800 K -C. Analysis of thermal
desorption spectra showed that cesium forms two high-temperature phases during adsorption
of cesium on graphite monolayer in rhenium heated up to 1800 K. The first, intercalated
phase starts filling immediately and grows up to maximum concentration. The second,
diffusion phase appears with slight delay and grows incessantly during adsorption.
It is for the first time that the Fick Equation has been applied for such kind of
diffusion. Correspondences and average displacement L = f(Т,t) have been obtained at diffusion
of surface cesium in rhenium in the interval of temperatures 1600 K Т ν = 5 × 1013 cm-2·s-1, U = +2000 V, T = 1700 K, effectiveness of cesium diffusion δCs in the system of Re(1010)-C was identified with application
of suggested methods, which showed δCs = 0.45. Activation energies of Сs atoms diffusion in rhenium from rhenium were found and values Е1p = 5.65 ± 0.05 eV and Еp1 = 5.85 ± 0.05 eV were obtained respectively.
Effect of electrical field on intercalation and cesium diffusion in Re-C was observed.