Lattice dynamics ofCePd3

The room-temperature phonon-dispersion curves of the mixed-valent compound ${\mathrm{CePd}}_3$ were measured by inelastic neutron scattering techniques. No significant anomalies in either the phonon frequencies or in the widths of the measured neutron groups were observed. The phonon spectrum of ${\mathrm{CePd}}_3$ resembles closely those of ${\mathrm{CeSn}}_3$ and ${\mathrm{LaSn}}_3$. It is estimated that any lifetime effects due to the electron-phonon coupling in ${\mathrm{CePd}}_3$ are certainly smaller than approximately 0.15 THz at room temperature. The force constants obtained by fitting the experimental data to a three-nearest-neighbor Born–von Kármán model were used to evaluate the phonon density of states, the lattice specific heat, and the atomic temperature factors of Ce and Pd in ${\mathrm{CePd}}_3$.