Large single crystals of fcc iron (y phase) were grown in situ and used to study the lattice dynamics of this phase of Fe by standard inelastic neutron scattering techniques. The phonon dispersion curves were measured along the [00$], [g'0], and [gg] symmetry directions at 1428 K. A selected number of phonon frequencies were also obtained at 1227 and 1640 K. We find that the measured dispersion curves are qualitatively similar to those of Ni and Ni03Feo 7 The 1428-K data were used to evaluate the elastic constants, the phonon density of states, and the lattice specific heat of y-Fe.

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