Partial Phonon Densities of States at the Fe-Sites in several Fe-Sn Intermetallic Compounds under Pressure*

We studied the nuclear resonant inelastic x-ray scattering (NRIXS) of Fe-57 in several Fe-Sn intermetallic compounds up to 30 GPa. The samples (FeSn$_{2}$, FeSn, Fe$_{5}$Sn$_{3}$, and Fe$_{3}$Sn) were prepared in the HiPSEC laboratory with 95{\%} enriched Fe-57 and 93{\%} enriched Sn-119. NRIXS spectra were collected at HPCAT beamline 16-ID-D at the Advanced Photon Source. High-pressure experiments were conducted using a Paderborn-type DAC [1]. The pressure dependence of the partial phonon DOS spectra will be discussed in terms of elastic and thermodynamic parameters, such as the Lamb-M\"{o}ssbauer factor, mean force constant, free energy, and Gr\"{u}neisen parameters, using results from recent x-ray powder diffraction experiments of the Fe-Sn intermetallics under pressure. [1] H. Giefers et al., High Pressure Research 22 (2002) 501. [2] H. Giefers et al., J. Alloys Compd. accepted.