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Specific Features of the Defect Formation in LiF Crystals as a Result of Implantation of Li + and F + Ions
Author(s) -
Alekseeva L. I.,
Titov Yu. M.,
Urusovskaya A. A.,
Knab G. G.,
Guseva M. I.,
Gordeeva G. V.
Publication year - 1993
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221780106
Subject(s) - fluence , ion , penetration depth , conductivity , ion implantation , materials science , irradiation , electron , electrical resistivity and conductivity , atomic physics , analytical chemistry (journal) , absorption (acoustics) , molecular physics , chemistry , optics , physics , organic chemistry , chromatography , quantum mechanics , nuclear physics , composite material
The results of an investigation of the mechanical, electrical, and optical properties in the near‐surface layer of LiF crystals irradiated with Li + and F + ions (energy 80 keV, fluence up to 10 17 cm −2 ) are presented. The hardening in the layer, the thickness of which is by an order of magnitude larger than the ion penetration depth, as well as a significant difference in conductivity change are revealed. The conductivity change is explained in the case of F + implantation by a combination of cation vacancies with hole centers and in the case of Li + implantation by the appearance of an electron component in conductivity with an activation energy of 0.36 eV. By optical measurements the temperature change of the position and half‐width of the colloidal absorption band is observed. The latter one is connected with electron‐phonon interaction in Li colloidal particles. It is found also that the colloidal band can be separated into three elemental bands, the shape of which is nearly Gaussian in wavelength coordinates due to the statistical particle‐size distribution.