In-beam Mössbauer spectra of 57 Mn implanted into lithium aluminum hydride

In-beam Mössbauer spectra of Mn implanted into LiAlH were measured at different temperatures between 17 and 300 K. The Mössbauer spectrum measured at 17 K showed two sets of doublets, which were assigned to Fe atoms at substitutional sites at Al and Li sites. The Debye temperatures θ for the Fe atoms at Al -substituted and Li -substituted sites were estimated to be 194 K and 117 K, respectively. The assignments were confirmed by density functional theory calculations.