Lattice Dynamics of Platinum

The energy/wavevector relations of phonons in the 100 and 110 planes of the reciprocal lattice of platinum have been determined by inelastic neutron scattering at room temperature. The measurements have been performed by the time-of-flight technique using the rotating crystal spectrometer and the pseudo-statistical chopper at the FR2 in Karlsruhe. The measured dispersion relations have been fitted with a Born-von Karman model using up to fifth-nearest neighbours. From these data the frequency distribution has been generated with the sampling technique and used for the calculation of various thermodynamic quantities. (author)