Cobalt atoms in ordered Pt–Co alloys are not imaged in the field ion microscope, although in the lattice the Co atoms occupy sites equivalent to those of the Pt atoms. Using the atom-probe FIM, we show that the invisibility of the Co atoms in Pt3Co is caused by selective field ionization of the image gas above Pt atoms only, rather than by the absence of Co atoms in the surface by preferential field evaporation.
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Tsong et al. (1973) studied this question.
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