Lattice-location studies of argon, potassium, and calcium in iron

The lattice locations of argon, potassium, and calcium implanted into iron single crystals have been studied using a particle-channeling technique. Yields of $K$ x-rays and backscattered ${}_{}{}^4{}_{}{}^{}\mathrm{He}_{}^{+}{}_{}{}^{}$ ions were monitored as a function of crystal-incident beam orientation. Substitutional fractions of 0.55±0.05, 0.11±0.05, and ≤0.05 were deduced for calcium, potassium, and argon, respectively; the remaining atoms reside in undetermined sites.