We employed nuclear inelastic scattering of synchrotron radiation to measure the anisotropy in the phonon density of states of an FePt thin film ordered in the L1 0 phase and compared our results with ab initio calculations. We find a strong anisotropy in the phonon density of states along the a and c axes of the crystal, which induces a difference in the calculated thermodynamic and elastic parameters along these axes. Calculations of surface-related effects show that a strong deviation from the bulk vibrational spectrum is observed for an Fe-terminated surface. We deduce by comparison with our surface sensitive measurement that the FePt͑100͒-oriented surface is Pt terminated. This contrasts with a recent measurement on FePt nanoparticles, where additional low-energy modes are observed. The findings are expected to be representative of the lattice dynamics of L1 0 intermetallics.
Deuterium exchange of certain substituted statistical pattern ; a T+O (q5-f?31) rearrangement mechanism is proposed to account for the novel pattern of ferrocenes (under very mild basic conditions) occurs in only the substituted cyclopentadienyl-ring in non-exchange.
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