%0 Journal Article
%T Octahedral conversion of a-SiO2-host matrix by pulsed ion implantation
%A D. A. Zatsepin
%A A. F. Zatsepin
%A D. W. Boukhvalov
%A E. Z. Kurmaev
%A N. V. Gavrilov
%A N. A. Skorikov
%A A. von Czarnowski
%A H. -J. Fitting
%J Physics
%D 2015
%I arXiv
%X This is the abstract. The results of measurements of X-ray photoelectron spectra (XPS) of a-SiO2-host material after pulsed implantation with [Mn+] and [Co+, Mn+]-ions as well as DFT-calculations are presented. The low-energy shift is found in XPS Si 2p and O 1s core-levels of single [Mn+] and dual [Co+, Mn+] pulsed ion-implanted a-SiO2 (E = 30 keV, D = 2*10^17 cm^-2) with respect to those of untreated a-SiO2.The similar changes are found in XPS Si 2p and O 1s of stishovite compared to those of quartz. This means that the pulsed ion-implantation induces the local high pressure effect which leads to an appearance of SiO6-structural units in alpha-SiO2 host, forming "stishovite-like" local atomic structure. This process can be described within electronic bonding transition from the four-fold "quartz-like" to six-fold "stishovite-like" high-pressure phase in SiO2 host-matrix. It is found that such octahedral conversion depends on the fluence and starts with doses higher than D = 3*10^16 cm^-2.
%U http://arxiv.org/abs/1505.06901v1