Ni ion damage in Cu and Nb Page: 3 of 8
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Table 1. Impurity analysis of Cu and Nb samples.
(wt. ppm) H C N 0 Ta W
Cu 30 - <5 10 - -
Nb <5 50 10 50 50 15
Generalizing the integral diffuse scattering measurements to
ion-damaged crystals requires taking into account the inhomogeneous
nature of the depth distribution of the damage. This inhomogeneous
distribution is shown in Fig. 1 where we have plotted the results of
theoretical damage distribution calculations for 4 and 60 MeV Ni ions in
Cu. We dealt with the depth distribution problem in a straightforward
manner by computing an effective absorbtion factor based on the total
path length of the x-rays as a function of depth. This absorbtion factor
is shown in Fig. I for the (111) and (222) reflections in Cu.
A potential problem with this approach exists if there is a strong
depth dependence to the defect size distribution. The TEM measurements
indicate that the average cluster size increases slightly as the end of
range of the incident ions is approached. We have checked the effect of
this depth dependence of the size distribution by comparing distributions
derived from x-ray measurements near the (111) and (222) reflections in
Cu irradiated with 60 MeV Ni ions. Due to absorbtion, the (111) and
(222) measurements sample the depth distribution of the damage different-
ly (See Fig. 1). However, loop size distributions derived from these
measurements were very nearly the same, indicating that a small depth
dependence to the size distribution does not seriously affect the x-ray
results. Size distributions derived from (110) and (220) x-ray measure-
ments in Nb were also very similar.
RESULTS AND DISCUSSION
The results of x-ray and TEM measurements of loop size distributions
in ion-irradiated Cu samples are summarized in Fig. 2. Also shown in the
figure is a size distribution derived from x-ray measurements of Cu
irradiated with fast neutrons to a comparable damage energy.4 For the
ion case, the size distributions correspond to the cluster densities
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Roberto, J.B. & Narayan, J. Ni ion damage in Cu and Nb, article, January 1, 1975; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc866240/m1/3/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.