Mössbauer spectra obtained using β − γ coincidence method after 57Mn implantation into LiH and LiD

Highly energetic 57Mn (T1/2 = 1.45 m) was generated by nuclear projectile fragmentation in a heavy-ion accelerator, and implanted into lithium hydride (LiH) and lithium deuteride (LiD) at 578 K. Mossbauer spectroscopy with β − γ coincidence detection was then carried out on the 57Fe obtained from β−decay of the 57Mn to study the time dependence of the site distributions and coordination environments of dilute Fe atoms implanted in the LiH and LiD. The results suggest that the Fe atoms can substitute for either the Li and H or D atoms within 100 ns. Additionally, the displacement behavior of the substitutional 57Fe atoms on the lattice sites is discussed.