Abstract
A new approach was developed, employing the field-on microscope technique, to determine directly radiation damage profiles in order-disorder alloys; the approach was applied to Pt 3Co. The experiment consisted of irradiating in situ, at 30 K, Pt 3Co specimens with low-energy (500–2500 eV) Ne + ions. The specimens were subsequently dissected on an atom-by-atom basis employing the pulse field-evaporation technique. The latter procedure made it possible to determine the change in the Bragg-Williams long-range order parameter ( S) as a function of distance from the irradiated surface. The measurement of δS d, where the subscript indicates damage, versus distance ( x) constituted a radiation damage profile; the depth resolution of this profile was ≈2 A ̊ . The mean depth of damage ( x d ) varied from ≈9 to 20 A ̊ and the standard deviation or straggling ( δ x ) varied from ≈6 to 18 A ̊ as the implantation energy was increased from 500 to 2500 eV. The radiation damage profiles have also been used to determine the effective stopping power of Ne in Pt 3Co.
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