Tunnel Scanning Microscopy and Spectroscopy in Studying Fe
Cr Stainless Steels1
E. V. Trofimova, E. V. Kasatkin, and I. I. Reformatskaya
Karpov Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 105064 Russia
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Received June 28, 2005
Abstract — Scanning tunnel microscopy (STM) and scanning tunnel spectroscopy (STS) are used in studying highly pure iron and chromium and Fe–x%Cr (2.4
x 60 wt %) alloys at the air boundary, as well as some of the alloys in 0.01 N H2SO4 . The obtained probability coefficients (
) of the electron tunnel transfer from a specimen to the needle and the slopes (
) of the logarithmic Ut/
It) dependences as functions of the chromium content in Fe–Cr alloys confirm the critical compositions of the alloys containing ~6.5 and 10–13% chro-mium, which is in accord with the results of the steady-state and transient electrochemical measurements. A correlation between these critical compositions of the alloys and sharp changes in the histograms of 
and values is observed. Pronounced extreme properties of the Fe–25.2% Cr alloy surface, which corresponds to the inclusion of Cr atoms in tetrahedral voids of the alloy crystal lattice, are noticed.
x 60 wt %) alloys at the air boundary, as well as some of the alloys in 0.01 N H2SO4 . The obtained probability coefficients () of the electron tunnel transfer from a specimen to the needle and the slopes () of the logarithmic Ut/It) dependences as functions of the chromium content in Fe–Cr alloys confirm the critical compositions of the alloys containing ~6.5 and 10–13% chro-mium, which is in accord with the results of the steady-state and transient electrochemical measurements. A correlation between these critical compositions of the alloys and sharp changes in the histograms of and values is observed. Pronounced extreme properties of the Fe–25.2% Cr alloy surface, which corresponds to the inclusion of Cr atoms in tetrahedral voids of the alloy crystal lattice, are noticed. DOI: 10.1134/S0033173206030040