By Topic

Ternary CoxFe(1-x)Si2 and NixFe(1-x)Si2 formed by ion implantation in silicon

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

The purchase and pricing options are temporarily unavailable. Please try again later.
6 Author(s)
Fetzer, Cs. ; KFKI Research Institute for Particle and Nuclear Physics, P.O. Box 49, H-1525 Budapest 114, Hungary ; Dezsi, I. ; Vantomme, A. ; Wu, M.F.
more authors

Your organization might have access to this article on the publisher's site. To check, click on this link: 

Co1-xFexSi2 and Ni1-xFexSi2 metastable ternary phases were formed by sequentially implanting Co, Ni, and Fe into Si (111) at 623 K. In order to compare the phases formed by ion implantation, the Ni1-xFexSi2 stable bulk ternary phase with a wide variety of x values was synthesized. The samples were studied by Mössbauer effect, transmission electron microscopy (TEM), x-ray diffraction, and Rutherford backscattering and channeling. X-ray diffraction and TEM results on the as-implanted samples with x=0.5 indicate a cubic (fluorite) structure. 57Fe Mössbauer spectra show three resonanceline components. Comparison of the isomer shift values of the components with those measured in the stable and metastable transition-metal silicide phases indicated three different sites for iron atoms: Fe substituting Co or Ni; Fe in the empty cubes of the fluorite-type lattices; and Fe populating sites in the CsCl-type B2 lattice. In samples of Ni1-xFexSi2 annealed at 1273 K, α-FeSi2 and a fraction of Fe dissolved in NiSi2 appeared. It was found that Fe is more soluble (maximum 30 at. %) in NiSi2 than it is in CoSi2. Implanting and annealing Co or Ni or both Co and Ni at relatively low concentration in Si already implanted with Fe resulted in β-FeSi2 with C- o, Ni, and Co+Ni content, respectively. The hyperfine interaction parameters of 57Fe were slightly modified by the dissolved Co and Ni in the β-FeSi2 lattice. © 2002 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:92 ,  Issue: 7 )